PRELIMINARY DATA SHEET
512M bits Mobile RAM
WTR (Wide Temperature Range)
EDS51321DBH-TS (16M words × 32 bits)
Specifications
Features
• Density: 512M bits
• Organization
4M words × 32 bits × 4 banks
• Package: 90-ball FBGA
Lead-free (RoHS compliant) and Halogen-free
• Power supply: VDD, VDDQ = 1.7V to 1.95V
• Clock frequency: 166MHz/133MHz (max.)
• 2KB page size
Row address: A0 to A12
Column address: A0 to A8
• Four internal banks for concurrent operation
• Interface: LVCMOS
• Burst lengths (BL): 1, 2, 4, 8, full page
• Burst type (BT):
Sequential (1, 2, 4, 8, full page)
Interleave (1, 2, 4, 8)
• /CAS Latency (CL): 3
• Precharge: auto precharge option for each burst
access
• Driver strength: normal, 1/2, 1/4, 1/8
• Refresh: auto-refresh, self-refresh
• Refresh cycles: 8192 refresh cycles/64ms
• Operating ambient temperature range
TA = –25°C to +85°C
• ×32 organization
• Single pulsed /RAS
• Burst read/write operation and burst read/single write
operation capability
• Byte control by DQM
• Wide temperature range
TA = –25°C to +85°C
• Low Power Function below is not supported
Partal Array Self-Refresh (PASR)
Auto Temperature Compensated Self-Refresh
Deep power-down mode
Ordering Information
Part number
Organization
(words × bits)
Internal Banks
Clock frequency
MHz (max.)
/CAS latency
Package
EDS51321DBH-6DTS-F
16M × 32
4
166
3
90-ball FBGA
EDS51321DBH-7BTS-F
133
Document No. E1415E21 (Ver. 2.1)
Date Published March 2009 (K) Japan
Printed in Japan
URL: http://www.elpida.com
Elpida Memory, Inc. 2008-2009
EDS51321DBH-TS
Part Number
E D S 51 32 1 D BH - 6D TS - F
Elpida Memory
Environment Code
F: Lead Free (RoHS Compliant)
and Halogen Free
Type
D: Monolithic Device
Spec Detail
TS: WTR (-25°C to +85°C)
Product Family
S: (SDR) Mobile RAM
Speed
6D: 166MHz/CL3
7B: 133MHz/CL3
Density / Bank
51: 512Mb/4-bank
Organization
32: x32
Package
BH: FBGA
Power Suply, Interface
1: 1.8V, LVCMOS, w/o Low Power Function
Die Rev.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
2
EDS51321DBH-TS
Pin Configurations
/xxx indicates active low signal.
90-ball FBGA
2
1
3
4
5
6
7
8
9
A
DQ26 DQ24 VSS
VDD DQ23 DQ21
DQ28 VDDQ VSSQ
VDDQ VSSQ DQ19
VSSQ DQ27 DQ25
DQ22 DQ20 VDDQ
VSSQ DQ29 DQ30
DQ17 DQ18 VDDQ
B
C
D
E
VDDQ DQ31
NC
NC
DQ16 VSSQ
VSS DQM3
A3
A2
DQM2 VDD
F
G
A4
A5
A6
A10
A0
A1
A7
A8
A12
NC
BA1
A11
CLK
CKE
A9
BA0
/CS
/RAS
DQM1
NC
NC
/CAS
/WE DQM0
VSS
VDD
DQ7 VSSQ
VSSQ DQ10 DQ9
DQ6
DQ5 VDDQ
VSSQ DQ12 DQ14
DQ1
DQ3 VDDQ
H
J
K
L
VDDQ DQ8
M
N
P
DQ11 VDDQ VSSQ
VDDQ VSSQ DQ4
R
DQ13 DQ15 VSS
VDD
DQ0
DQ2
(Top view)
Pin name
Function
Pin name
Function
A0 to A12
Address inputs
CLK
Clock input
BA0, BA1
Bank select address
CKE
Clock enable
DQ0 to DQ31
Data-input/output
VDD
Power for internal circuit
/CS
Chip select
VSS
Ground for internal circuit
/RAS
Row address strobe
VDDQ
Power for DQ circuit
/CAS
Column address strobe
VSSQ
Ground for DQ circuit
/WE
Write enable
NC
No connection
DQM0 to DQM3
DQ mask enable
Preliminary Data Sheet E1415E21 (Ver. 2.1)
3
EDS51321DBH-TS
CONTENTS
Specifications.................................................................................................................................................1
Features.........................................................................................................................................................1
Ordering Information......................................................................................................................................1
Part Number ..................................................................................................................................................2
Pin Configurations .........................................................................................................................................3
Electrical Specifications.................................................................................................................................5
Block Diagram ...............................................................................................................................................9
Pin Function.................................................................................................................................................10
Command Operation ...................................................................................................................................12
Simplified State Diagram .............................................................................................................................21
Mode Register and Extended Mode Register Configuration.......................................................................22
Initialization Sequence.................................................................................................................................24
Operation of the Mobile RAM ......................................................................................................................25
Timing Waveforms.......................................................................................................................................41
Package Drawing ........................................................................................................................................48
Recommended Soldering Conditions..........................................................................................................49
Preliminary Data Sheet E1415E21 (Ver. 2.1)
4
EDS51321DBH-TS
Electrical Specifications
• All voltages are referenced to VSS (GND).
• After power up, execute power up sequence and initialization sequence before proper device operation is achieved
(refer to the Power up sequence).
Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Voltage on any pin relative to VSS
VT
–0.5 to +2.3
V
Supply voltage relative to VSS
VDD
–0.5 to +2.3
V
Short circuit output current
IOS
50
mA
Power dissipation
PD
1.0
W
Operating ambient temperature
TA
–25 to +85
°C
Storage temperature
Tstg
–55 to +125
°C
Note
Caution
Exposing the device to stress above those listed in Absolute Maximum Ratings could cause
permanent damage. The device is not meant to be operated under conditions outside the limits
described in the operational section of this specification. Exposure to Absolute Maximum Rating
conditions for extended periods may affect device reliability.
Recommended DC Operating Conditions (TA = –25°C to +85°C)
Parameter
Symbol
min.
max.
Unit
Notes
Supply voltage
VDD, VDDQ
1.7
1.95
V
1
VSS, VSSQ
0
0
V
2
Input high voltage
VIH
0.8 × VDD
VDD + 0.3
V
3
Input low voltage
VIL
–0.3
0.3
V
4
Notes: 1.
2.
3.
4.
The supply voltage with all VDD and VDDQ pins must be on the same level.
The supply voltage with all VSS and VSSQ pins must be on the same level.
VIH (max.) = 2.3V (pulse width ≤ 5ns)
VIL (min.) = –0.5V (pulse width ≤ 5ns)
Preliminary Data Sheet E1415E21 (Ver. 2.1)
5
EDS51321DBH-TS
DC Characteristics 1 (TA = –25°C to +85°C, VDD, VDDQ = 1.7V to 1.95V, VSS, VSSQ = 0V)
Parameter
/CAS latency
Symbol
Grade
max.
Unit
Operating current
IDD1
-6D
-7B
70
65
mA
Standby current in power down
IDD2P
0.8
mA
Standby current in power down
(input signal stable)
IDD2PS
0.6
mA
Standby current in non power down
IDD2N
5.0
4.0
mA
Standby current in non power down
(input signal stable)
IDD2NS
2.0
mA
Active standby current in power down
IDD3P
4.0
mA
Active standby current in power down
(input signal stable)
IDD3PS
3.0
mA
Active standby current in non power down IDD3N
15
mA
Active standby current in non power down
IDD3NS
(input signal stable)
10
mA
125
100
mA
-6D
-7B
-6D
-7B
Burst operating current
IDD4
Refresh current
IDD5
80
mA
Self-refresh current
IDD6
3.0
mA
Test condition
Burst length = 1,
tRC = tRC (min.),
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE ≤ VIL (max.),
tCK = tCK (min.) ,
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE ≤ VIL (max.), tCK = ∞,
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE, /CS = VIH,
tCK = tCK (min.),
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE = VIH, tCK = ∞,
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE ≤ VIL,
tCK = tCK (min.),
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE ≤ VIL, tCK = ∞
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE, /CS = VIH,
tCK = tCK (min.),
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
CKE = VIH, tCK = ∞,
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
tCK = tCK (min.), BL = 4
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
tRFC = tRFC (min.)
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
VIL ≤ VIL (max.),
VIH ≥ VIH (min.)
Notes
1, 2, 3
6
7
4
8
1, 2, 6
2, 7
1, 2, 4
2, 8
1, 2, 5
3
Notes: 1. IDD depends on output load condition when the device is selected. IDD (max.) is specified at the output
open condition.
2. One bank operation.
3. Input signals are changed once per one clock.
4. Input signals are changed once per two clocks.
5. Input signals are changed once per four clocks.
6. After power down mode, CLK operating current.
7. After power down mode, no CLK operating current.
8. Input signals are VIH or VIL fixed.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
6
EDS51321DBH-TS
DC Characteristics 2 (TA = –25°C to +85°C, VDD, VDDQ = 1.7V to 1.95V, VSS, VSSQ = 0V)
Parameter
Symbol
min.
max.
Unit
Test condition
Input leakage current
ILI
–2.0
2.0
µA
0 ≤ VIN ≤ VDD
Notes
Output leakage current
ILO
–1.5
1.5
µA
0 ≤ VOUT ≤ VDD, DQ = disable
Output high voltage
VOH
VDD – 0.2
—
V
IOH = –0.1 mA
Output low voltage
VOL
—
0.2
V
IOL = 0.1 mA
Pin Capacitance (TA = 25°C, VDD, VDDQ = 1.7V to 1.95V)
Parameter
Symbol
Pins
min.
typ.
max.
Unit
Notes
Input capacitance
CI1
CLK
1.5
—
4.0
pF
1, 2, 4
CI2
Address, CKE, /CS,
/RAS, /CAS, /WE, 1.5
DQM
—
4.0
pF
1, 2, 4
CI/O
DQ
—
4.5
pF
1, 2, 3, 4
Data input/output
capacitance
Notes: 1.
2.
3.
4.
2.0
Capacitance measured with Boonton Meter or effective capacitance measuring method.
Measurement condition: f = 1MHz, 0.5 × VDDQ, 200mV swing.
DQM = VIH to disable DOUT.
This parameter is sampled and not 100% tested.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
7
EDS51321DBH-TS
AC Characteristics (TA = –25°C to +85°C, VDD, VDDQ = 1.7V to 1.95V, VSS, VSSQ = 0V)
-6D
-7B
Parameter
Symbol
min.
max.
min.
max.
Unit
Notes
System clock cycle time
tCK
6
—
7.5
—
ns
1
CLK high pulse width
tCH
2.5
—
2.5
—
ns
1, 5
CLK low pulse width
tCL
2.5
—
2.5
—
ns
1, 5
Access time from CLK
tAC
—
5.4
—
6.0
ns
1, 2, 5
Data-out hold time
tOH
2.6
—
2.6
—
ns
1, 2, 5
CLK to Data-out low impedance
tLZ
0
—
0
—
ns
1, 2, 3, 5
CLK to Data-out high impedance
tHZ
—
5.4
—
6.0
ns
1, 4
Input setup time
tSI
1.9
—
1.9
—
ns
1, 5
Input hold time
tHI
0.9
—
0.9
—
ns
1, 5
Active to Ref/Active command period
tRC
72.5
—
72.5
—
ns
1
Refresh to Ref/Active command period
tRFC
80
—
80
—
ns
1
Self-refresh exit to Ref/Active command period
tSREX
120
—
120
—
ns
1
Active to Precharge command period
tRAS
45
120000
45
120000
ns
1
Active command to column command (same bank)
tRCD
18
—
22.5
—
ns
1
Precharge to active command period
tRP
18
—
22.5
—
ns
1
Write recovery or data-in to precharge lead time
tDPL
15
—
15
—
ns
1
Last data into active latency
tDAL
2CLK +
tRP
—
2CLK +
tRP
—
Active (a) to Active (b) command period
tRRD
12
—
15
—
ns
1
Mode register set to active command period
tMRD
2
—
2
—
tCK
Transition time (rise and fall)
tT
0.5
1.0
0.5
1.0
ns
Refresh period
(8192 refresh cycles)
tREF
—
64
—
64
ms
Notes: 1.
2.
3.
4.
5.
AC measurement assumes tT = 0.5ns. Reference level for timing of input signals is 0.5 × VDDQ.
Access time is measured at 0.5 × VDDQ. Load condition is CL = 15pF.
tLZ (min.) defines the time at which the outputs achieves the low impedance state.
tHZ (max.) defines the time at which the outputs achieves the high impedance state.
If tT ≥ 1ns, each parameters is changed as follows;
tAC, tOH, tLZ: should be added (tT (rise)/2 – 0.5)
tCH, tCL, tSI, tHI: should be added {(tT (rise) + tT (fall))/2 – 1}
Test Conditions
• Input and output timing reference levels: VDDQ × 0.5
• Input waveform and output load: See following figures
1.6V
input
0.2V
I/O
1.4V
0.3V
CL
tT
tT
Output load
Preliminary Data Sheet E1415E21 (Ver. 2.1)
8
EDS51321DBH-TS
Block Diagram
CLK
CKE
Clock
Generator
Bank 3
Bank 2
Bank 1
Mode
Register
Row
Address
Buffer
&
Refresh
Counter
Row Decoder
Address
Bank 0
Data Control Circuit
Preliminary Data Sheet E1415E21 (Ver. 2.1)
9
Input & Output
Buffer
/WE
DQM
Column Decoder &
Latch Circuit
Column
Address
Buffer
&
Burst
Counter
Latch Circuit
/CAS
Control Logic
/RAS
Command Decoder
Sense Amplifier
/CS
DQ
EDS51321DBH-TS
Pin Function
CLK (input pin)
CLK is the master clock input. Other inputs signals are referenced to the CLK rising edge.
CKE (input pins)
CKE determine validity of the next CLK (clock). If CKE is high, the next CLK rising edge is valid; otherwise it is
invalid. If the CLK rising edge is invalid, the internal clock is not issued and the Synchronous DRAM suspends
operation.
When the Synchronous DRAM is not in burst mode and CKE is negated, the device enters power down mode.
During power down mode, CKE must remain low.
/CS (input pins)
/CS low starts the command input cycle. When /CS is high, commands are ignored but operations continue.
/RAS, /CAS, and /WE (input pins)
/RAS, /CAS and /WE have the same symbols on conventional DRAM but different functions. For details, refer to the
command table.
A0 to A12 (input pins)
Row Address is determined by A0 to A12 at the CLK (clock) rising edge in the active command cycle.
Column Address is determined at the CLK rising edge in the read or write command cycle (See Address Pins table).
[Address Pins Table]
Address (A0 to A12)
Part number
Row address
Column address
EDS51321DBH
AX0 to AX12
AY0 to AY8
A10 defines the precharge mode. When A10 is high in the precharge command cycle, all banks are precharged;
when A10 is low, only the bank selected by BA0 and BA1 is precharged.
When A10 is high in read or write command cycle, the precharge starts automatically after the burst access.
BA0 and BA1 (input pin)
BA0 and BA1 are bank select signal (BS). (See Bank Select Signal Table)
[Bank Select Signal Table]
BA0
BA1
Bank 0
L
L
Bank 1
H
L
Bank 2
L
H
Bank 3
H
H
Remark: H: VIH. L: VIL.
DQM0 to DQM3 (input pins)
DQM controls I/O buffers. In read mode, DQM controls the output buffers like a conventional /OE pin. DQM high and
DQM low turn the output buffers off and on, respectively. The DQM latency for the read is two clocks. In write mode,
DQM controls the word mask. Input data is written to the memory cell if DQM is low but not if DQM is high. The
DQM latency for the write is zero.
Each DQM pin corresponds to eight DQ pins, respectively (See DQM Correspondence Table).
Preliminary Data Sheet E1415E21 (Ver. 2.1)
10
EDS51321DBH-TS
DQ0 to DQ31 (input/output pins)
DQ pins have the same function as I/O pins on a conventional DRAM.
[DQM Correspondence Table]
Organization
Data mask
DQs
× 32 bits
DQM0
DQ0 to DQ7
DQM1
DQ8 to DQ15
DQM2
DQ16 to DQ23
DQM3
DQ24 to DQ31
VDD, VSS, VDDQ, VSSQ (Power supply)
VDD and VSS are power supply pins for internal circuits. VDDQ and VSSQ are power supply pins for the output
buffers.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
11
EDS51321DBH-TS
Command Operation
Command Truth Table
The Mobile RAM recognizes the following commands specified by the /CS, /RAS, /CAS, /WE and address pins.
CKE
Function
Symbol
n–1
n
/CS
/RAS
/CAS
/WE
BA1
BA0
A10
Address
Device deselect
DESL
H
×
H
×
×
×
×
×
×
×
No operation
NOP
H
×
L
H
H
H
×
×
×
×
Burst stop
BST
H
×
L
H
H
L
×
×
×
×
Read
READ
H
×
L
H
L
H
V
V
L
V
Read with auto precharge
READA
H
×
L
H
L
H
V
V
H
V
Write
WRIT
H
×
L
H
L
L
V
V
L
V
Write with auto precharge
WRITA
H
×
L
H
L
L
V
V
H
V
Bank activate
ACT
H
×
L
L
H
H
V
V
V
V
Precharge select bank
PRE
H
×
L
L
H
L
V
V
L
×
Precharge all banks
PALL
H
×
L
L
H
L
×
×
H
×
Mode register set
MRS
H
×
L
L
L
L
L
L
L
V
Extended mode register set
EMRS
H
×
L
L
L
L
H
L
L
V
Remark: H: VIH. L: VIL. ×: VIH or VIL. V: Valid address input.
Device deselect command [DESL]
When this command is set (/CS is high), the Mobile RAM ignore command input at the clock. However, the internal
status is held.
No operation [NOP]
This command is not an execution command. However, the internal operations continue.
Burst stop command [BST]
This command can stop the current burst operation.
Column address strobe and read command [READ]
This command starts a read operation. In addition, the start address of burst read is determined by the column
address (see Address Pins Table in Pin Function) and the bank select address (BA0, BA1). After the read operation,
the output buffer becomes high-Z.
Read with auto precharge [READA]
This command automatically performs a precharge operation after a burst read with a burst length of 1, 2, 4 or 8.
Column address strobe and write command [WRIT]
This command starts a write operation. When the burst write mode is selected, the column address (see Address
Pins Table in Pin Function) and the bank select address (BA0, BA1) become the burst write start address. When the
single write mode is selected, data is only written to the location specified by the column address (see Address Pins
Table in Pin Function) and the bank select address (BA0, BA1).
Write with auto precharge [WRITA]
This command automatically performs a precharge operation after a burst write with a length of 1, 2, 4 or 8, or after a
single write operation.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
12
EDS51321DBH-TS
Row address strobe and bank activate [ACT]
This command activates the bank that is selected by BA0, BA1 and determines the row address (A0 to A12). (See
Bank Select Signal Table)
Precharge selected bank [PRE]
This command starts precharge operation for the bank selected by BA0, BA1. (See Bank Select Signal Table)
[Bank Select Signal Table]
BA0
BA1
Bank 0
L
L
Bank 1
H
L
Bank 2
L
H
Bank 3
H
H
Remark: H: VIH. L: VIL.
Precharge all banks [PALL]
This command starts a precharge operation for all banks.
Refresh [REF/SELF]
This command starts the refresh operation. There are two types of refresh operation, the one is auto-refresh, and
the other is self-refresh. For details, refer to the CKE truth table section.
Mode register set [MRS]
The Mobile RAM has a mode register that defines how it operates. The mode register is specified by the address
pins (A0 to BA0 and BA1) at the mode register set cycle. For details, refer to the mode register configuration. After
power on, the contents of the mode register are undefined, execute the mode register set command to set up the
mode register.
Extended mode register set [EMRS]
The Mobile RAM has an extended mode register that defines the driver strength (DS).
Preliminary Data Sheet E1415E21 (Ver. 2.1)
13
EDS51321DBH-TS
DQM Truth Table
CKE
DQM
Function
Symbol
n–1
n
0
1
2
3
Data write / output enable
ENB
H
×
L
L
L
L
Data mask / output disable
MASK
H
×
H
H
H
H
DQ0 to DQ7 write enable/output enable
ENB0
H
×
L
×
×
×
DQ8 to DQ15 write enable/output enable
ENB1
H
×
×
L
×
×
DQ16 to DQ23 write enable/output enable
ENB2
H
×
×
×
L
×
DQ24 to DQ31 write enable/output enable
ENB3
H
×
×
×
×
L
DQ0 to DQ7 write inhibit/output disable
MASK0
H
×
H
×
×
×
DQ8 to DQ15 write inhibit/output disable
MASK 1
H
×
×
H
×
×
DQ16 to DQ23 write inhibit/output disable
MASK 2
H
×
×
×
H
×
DQ24 to DQ31 write inhibit/output disable
MASK 3
H
×
×
×
×
H
Remark: H: VIH. L: VIL. ×: VIH or VIL
CKE Truth Table
CKE
Current state
Function
Symbol
n–1
n
/CS
/RAS
/CAS
/WE
Address
Activating
Any
Clock suspend mode entry
H
L
×
×
×
×
×
Clock suspend mode
L
L
×
×
×
×
×
Clock suspend
Clock suspend mode exit
Idle
CBR (auto) refresh command
REF
L
H
×
×
×
×
×
H
H
L
L
L
H
×
Idle
Self-refresh entry
SELF
H
L
Self-refresh
Self-refresh exit
L
H
L
L
L
H
×
L
H
H
H
×
L
H
H
×
×
×
×
Idle
Power down entry
H
L
L
H
H
H
×
H
L
H
×
×
×
×
Power down
Power down exit
L
H
H
×
×
×
×
L
H
L
H
H
H
×
Remark: H: VIH. L: VIL. ×: VIH or VIL
Preliminary Data Sheet E1415E21 (Ver. 2.1)
14
EDS51321DBH-TS
Function Truth Table
The following table shows the operations that are performed when each command is issued in each mode of the
Mobile RAM.
The following table assumes that CKE is high.
Current state
/CS
Precharge
H
×
L
H
L
H
L
Idle
Row active
/RAS
/CAS
/WE
Address
Command
Operation
×
×
×
DESL
Enter IDLE after tRP
H
H
×
NOP
Enter IDLE after tRP
H
L
×
BST
ILLEGAL
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
3
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
3
L
L
H
H
BA, RA
ACT
ILLEGAL*
3
L
L
H
L
BA, A10
PRE, PALL
NOP*
L
L
L
H
×
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
5
L
L
L
L
MODE
EMRS
ILLEGAL
H
×
×
×
×
DESL
NOP
L
H
H
H
×
NOP
NOP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
4
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
4
L
L
H
H
BA, RA
ACT
Bank and row active
L
L
H
L
BA, A10
PRE, PALL
NOP
L
L
L
H
×
REF, SELF
Refresh
L
L
L
L
MODE
MRS
Mode register set*
L
L
L
L
MODE
EMRS
Extended mode register set*
H
×
×
×
×
DESL
NOP
L
H
H
H
×
NOP
NOP
8
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
Begin read*
L
H
L
L
BA, CA, A10
WRIT/WRITA
Begin write*
L
L
H
H
BA, RA
ACT
Other bank active
2
ILLEGAL on same bank*
L
L
H
L
BA, A10
PRE, PALL
Precharge*
L
L
L
H
×
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
L
L
L
L
MODE
EMRS
ILLEGAL
Preliminary Data Sheet E1415E21 (Ver. 2.1)
15
6
6
7
8
EDS51321DBH-TS
Current state
/CS
/RAS
/CAS
/WE
Address
Command
Operation
Read
H
×
×
×
×
DESL
Continue burst to end
L
H
H
H
×
NOP
Continue burst to end
L
H
H
L
×
BST
Burst stop
Read with auto
precharge
Write
L
H
L
H
BA, CA, A10
READ/READA
Continue burst read to /CAS
latency and New read
L
H
L
L
BA, CA, A10
WRIT/WRITA
Term burst read/start write
L
L
H
H
BA, RA
ACT
Other bank active
2
ILLEGAL on same bank*
L
L
H
L
BA, A10
PRE, PALL
Term burst read and Precharge
L
L
L
H
×
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
L
L
L
L
MODE
EMRS
ILLEGAL
H
×
×
×
×
DESL
L
H
H
H
×
NOP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
3
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
3
L
L
H
H
BA, RA
ACT
Other bank active
2
ILLEGAL on same bank*
L
L
H
L
BA, A10
PRE, PALL
ILLEGAL*
L
L
L
H
×
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
Continue burst to end and
precharge
Continue burst to end and
precharge
3
L
L
L
L
MODE
EMRS
ILLEGAL
H
×
×
×
×
DESL
Continue burst to end
L
H
H
H
×
NOP
Continue burst to end
L
H
H
L
×
BST
Burst stop
L
H
L
H
BA, CA, A10
READ/READA
Term burst and New read
L
H
L
L
BA, CA, A10
WRIT/WRITA
Term burst and New write
L
L
H
H
BA, RA
ACT
Other bank active
3
ILLEGAL on same bank*
L
L
H
L
BA, A10
PRE, PALL
Term burst write and Precharge*
L
L
L
H
×
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
L
L
L
L
MODE
EMRS
ILLEGAL
Preliminary Data Sheet E1415E21 (Ver. 2.1)
16
1
EDS51321DBH-TS
Current state
/CS
/RAS
/CAS
/WE
Address
Command
Write with auto
precharge
H
×
×
×
×
DESL
L
H
H
H
×
NOP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
3
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
3
L
L
H
H
BA, RA
ACT
Other bank active
3
ILLEGAL on same bank*
L
L
H
L
BA, A10
PRE, PALL
ILLEGAL*
L
L
L
H
×
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
L
L
L
L
MODE
EMRS
ILLEGAL
H
×
×
×
×
DESL
Enter IDLE after tRC
L
H
H
H
×
NOP
Enter IDLE after tRC
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
4
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
4
L
L
H
H
BA, RA
ACT
ILLEGAL*
4
L
L
H
L
BA, A10
PRE, PALL
ILLEGAL*
4
L
L
L
H
×
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
L
L
L
L
MODE
EMRS
ILLEGAL
H
×
×
×
×
DESL
NOP
L
H
H
H
×
NOP
NOP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
4
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
4
L
L
H
H
BA, RA
ACT
Bank and row active*
L
L
H
L
BA, A10
PRE, PALL
NOP
L
L
L
H
×
REF, SELF
Refresh*
L
L
L
L
MODE
MRS
Mode register set*
L
L
L
L
MODE
EMRS
Extended mode register set*
Extended mode register
H
set
×
×
×
×
DESL
NOP
L
H
H
H
×
NOP
NOP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
4
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
4
L
L
H
H
BA, RA
ACT
Bank and row active*
L
L
H
L
BA, A10
PRE, PALL
NOP
L
L
L
H
×
REF, SELF
Refresh*
L
L
L
L
MODE
MRS
Mode register set*
L
L
L
L
MODE
EMRS
Extended mode register set*
Refresh (auto-refresh)
Mode register set
Remark: H: VIH. L: VIL. ×: VIH or VIL
Preliminary Data Sheet E1415E21 (Ver. 2.1)
17
Operation
Continue burst to end and
precharge
Continue burst to end and
precharge
3
9
9
8
8
9
9
8
8
EDS51321DBH-TS
Notes: 1.
2.
3.
4.
5.
6.
7.
8.
9.
An interval of tDPL is required between the final valid data input and the precharge command.
If tRRD is not satisfied, this operation is illegal.
Illegal for same bank, except for another bank.
Illegal for all banks.
NOP for same bank, except for another bank.
Illegal if tRCD is not satisfied.
Illegal if tRAS is not satisfied.
MRS command must be issued after DOUT finished, in case of DOUT remaining.
Illegal if tMRD is not satisfied.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
18
EDS51321DBH-TS
Command Truth Table for CKE
CKE
Current State
n–1 n
Self-refresh
H
Self-refresh recovery
Power down
All banks idle
/CS
/RAS /CAS /WE Address
Operation
×
×
×
×
×
×
INVALID, CLK (n – 1) would exit self-refresh
L
H
H
×
×
×
×
Self-refresh recovery
L
H
L
H
H
×
×
Self-refresh recovery
L
H
L
H
L
×
×
ILLEGAL
L
H
L
L
×
×
×
ILLEGAL
L
L
×
×
×
×
×
Continue self-refresh
H
H
H
×
×
×
×
Idle after tRC
H
H
L
H
H
×
×
Idle after tRC
H
H
L
H
L
×
×
ILLEGAL
H
H
L
L
×
×
×
ILLEGAL
H
L
H
×
×
×
×
ILLEGAL
H
L
L
H
H
×
×
ILLEGAL
H
L
L
H
L
×
×
ILLEGAL
H
L
L
L
×
×
×
ILLEGAL
H
×
×
×
×
×
L
H
H
×
×
×
×
EXIT power down
L
H
L
H
H
H
×
EXIT power down
L
L
×
×
×
×
×
Continue power down mode
H
H
H
×
×
×
Refer to operations in Function Truth Table
H
H
L
H
×
×
Refer to operations in Function Truth Table
H
H
L
L
H
×
H
H
L
L
L
H
×
H
H
L
L
L
L
OPCODE Refer to operations in Function Truth Table
H
L
H
×
×
×
Begin power down next cycle
H
L
L
H
×
×
Refer to operations in Function Truth Table
H
L
L
L
H
×
Refer to operations in Function Truth Table
H
L
L
L
L
H
×
H
L
L
L
L
L
OPCODE Refer to operations in Function Truth Table
Notes
INVALID, CLK (n – 1) would exit power down
Refer to operations in Function Truth Table
Auto-refresh
Self-refresh
L
H
×
×
×
×
×
Exit power down next cycle
L
L
×
×
×
×
×
Power down
Row active
H
×
×
×
×
×
×
Refer to operations in Function Truth Table
L
×
×
×
×
×
×
Any state other than
H
H
×
×
×
×
listed above
H
L
×
×
×
×
×
Begin clock suspend next cycle
L
H
×
×
×
×
×
Exit clock suspend next cycle
L
L
×
×
×
×
×
Maintain clock suspend
Clock suspend
1
1
1
Refer to operations in Function Truth Table
2
Remark: H: VIH. L: VIL. ×: VIH or VIL
Notes: 1. Self-refresh can be entered only from the all banks idle state. Power down can be entered only from all
banks idle. Clock suspend can be entered only from following states, row active, read, read with auto
precharge, write and write with auto precharge.
2. Must be legal command as defined in Function Truth Table.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
19
EDS51321DBH-TS
Clock suspend mode entry
The Mobile RAM enters clock suspend mode from active mode by setting CKE to low. If command is input in the
clock suspend mode entry cycle, the command is valid. The clock suspend mode changes depending on the current
status (1 clock before) as shown below.
ACTIVE clock suspend
This suspend mode ignores inputs after the next clock by internally maintaining the bank active status.
READ suspend and READ with Auto precharge suspend
The data being output is held (and continues to be output).
WRITE suspend and WRIT with Auto precharge suspend
In this mode, external signals are not accepted. However, the internal state is held.
Clock suspend
During clock suspend mode, keep the CKE to low.
Clock suspend mode exit
The Mobile RAM exits from clock suspend mode by setting CKE to high during the clock suspend state.
IDLE
In this state, all banks are not selected, and completed precharge operation.
Auto-refresh command [REF]
When this command is input from the IDLE state, the Mobile RAM starts auto-refresh operation. (The auto-refresh is
the same as the CBR refresh of conventional DRAMs.) During the auto-refresh operation, refresh address and bank
select address are generated inside the Mobile RAM. For every auto-refresh cycle, the internal address counter is
updated. Accordingly, 4096 times are required to refresh the entire memory. Before executing the auto-refresh
command, all the banks must be in the IDLE state. In addition, since the precharge for all banks is automatically
performed after auto-refresh, no precharge command is required after auto-refresh.
Self-refresh entry [SELF]
When this command is input during the IDLE state, the Mobile RAM starts self-refresh operation. After the execution
of this command, self-refresh continues while CKE is low. Since self-refresh is performed internally and
automatically, external refresh operations are unnecessary.
Power down mode entry
When this command is executed during the IDLE state, the Mobile RAM enters power down mode. In power down
mode, power consumption is suppressed by cutting off the initial input circuit.
Self-refresh exit
When this command is executed during self-refresh mode, the Mobile RAM can exit from self-refresh mode. After
exiting from self-refresh mode, the Mobile RAM enters the IDLE state.
Power down exit
When this command is executed at the power down mode, the Mobile RAM can exit from power down mode. After
exiting from power down mode, the Mobile RAM enters the IDLE state.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
20
EDS51321DBH-TS
Simplified State Diagram
SELF
REFRESH
EXTENDED
MODE
REGISTER
SET
SR ENTRY
EMRS
SR EXIT
MRS
MODE
REGISTER
SET
REFRESH
IDLE
*1
AUTO
REFRESH
CKE
CKE_
IDLE
POWER
DOWN
ACTIVE
ACTIVE
CLOCK
SUSPEND
CKE_
CKE
ROW
ACTIVE
BST
BST
WRITE
Write
WRITE
SUSPEND
CKE_
WRITE
READ
WRITE
WITH
AP
READ
WRITE
CKE
READ
WITH AP
WRITE
WITH AP
WRITEA
CKE_
READ
CKE
CKE
POWER
ON
READ
SUSPEND
READ
WITH AP
CKE_
READA
CKE
PRECHARGE
POWER
APPLIED
WRITE
WITH AP
Read
PRECHARGE
CKE_
WRITEA
SUSPEND
READ
WITH
AP
READA
SUSPEND
PRECHARGE
PRECHARGE
PRECHARGE
Automatic transition after completion of command.
Transition resulting from command input.
Note: 1. After the auto-refresh operation, precharge operation is performed automatically and
enter the IDLE state.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
21
EDS51321DBH-TS
Mode Register and Extended Mode Register Configuration
Mode Register Set
The mode register is set by the input to the address pins (A0 to A12, BA0 and BA1) during mode register set cycles.
The mode register consists of five sections, each of which is assigned to address pins.
BA1, BA0, A8, A9, A10, A11, A12: (OPCODE): The Mobile RAM has two types of write modes. One is the burst
write mode, and the other is the single write mode. These bits specify write mode.
Burst read and burst write: Burst write is performed for the specified burst length starting from the column address
specified in the write cycle.
Burst read and single write: Data is only written to the column address specified during the write cycle, regardless of
the burst length.
A7: Keep this bit low at the mode register set cycle. If this pin is high, the vender test mode is set.
A6, A5, A4: (LMODE): These pins specify the /CAS latency.
A3: (BT): A burst type is specified.
A2, A1, A0: (BL): These pins specify the burst length.
BA1 BA0
A12
A11
A10
A9
A8
OPCODE
A6
0
A6
BA1 BA0 A12 A11
0
0
0
0
A7
A5
A5
LMODE
A4 CAS latency
A4
A3
A2
BT
A3 Burst type
A2 A1
0
0
0
0
0
1
R
0
1
0
R
0
0
1
1
3
1
X
X
R
0 Sequential
1
A10
0
A9
0
Write mode
A8
0 Burst read and burst write
1
X
X
X
0
0
R
1
0
X
X
X
0
0
R
1
1
X
X
X
0
0
X
X
X
X
X
X
X
X
X
X
0
1
1
0
X
X
X
X
X
1
1
A0
BL
R
0
A1
Interleave
A0
R
Mode Register Set
Preliminary Data Sheet E1415E21 (Ver. 2.1)
22
BT=0
BT=1
0
1
1
0
1
2
2
0
1
0
4
4
0
1
1
8
8
0
0
1
0
0
R
R
1
0
1
R
R
1
1
0
R
R
1
1
1
F.P.
R
R
R
Burst read and single write
Burst length
F.P.: Full Page
R is Reserved (inhibit)
X: 0 or 1
EDS51321DBH-TS
Extended Mode Register Set
A5 and A6: These pins specify driver strength.
A12 A11 A10
BA1 BA0
1
0
0
0
0
A9
A8
A7
0
0
0
A6
A5
DS
A4
A3
A2
A1
A0
0
0
0
0
0
A6 A5 Driver Strength
0
0
1
1
0
1
0
1
Normal
1/2 strength
1/4 strength
1/8 strength
Extended Mode Register Set
Burst Sequence
Burst length = 4
Burst length = 2
Starting Ad. Addressing(decimal)
Starting Ad. Addressing(decimal)
A0
Sequential Interleave
A1
A0
Sequential
Interleave
0
0, 1,
0, 1,
0
0
0, 1, 2, 3,
0, 1, 2, 3,
1
1, 0,
1, 0,
0
1
1, 2, 3, 0,
1, 0, 3, 2,
1
0
2, 3, 0, 1,
2, 3, 0, 1,
1
1
3, 0, 1, 2,
3, 2, 1, 0,
Burst length = 8
Addressing(decimal)
Starting Ad.
A2
A1
0
0
A0 Sequential
0
0, 1, 2, 3, 4, 5, 6, 7,
Interleave
0, 1, 2, 3, 4, 5, 6, 7,
0
0
1
1, 2, 3, 4, 5, 6, 7, 0,
1, 0, 3, 2, 5, 4, 7, 6,
0
1
0
2, 3, 4, 5, 6, 7, 0, 1,
2, 3, 0, 1, 6, 7, 4, 5,
0
1
1
3, 4, 5, 6, 7, 0, 1, 2,
3, 2, 1, 0, 7, 6, 5, 4,
1
0
0
4, 5, 6, 7, 0, 1, 2, 3,
4, 5, 6, 7, 0, 1, 2, 3,
1
0
1
5, 6, 7, 0, 1, 2, 3, 4,
5, 4, 7, 6, 1, 0, 3, 2,
1
1
0
6, 7, 0, 1, 2, 3, 4, 5,
6, 7, 4, 5, 2, 3, 0, 1,
1
1
1
7, 0, 1, 2, 3, 4, 5, 6,
7, 6, 5, 4, 3, 2, 1, 0,
Burst Sequence
Full page burst is available only for sequential addressing. The addressing sequence is started from the column
address that is asserted by read/write command. And the address is increased one by one.
It is back to the address 0 when the address reaches at the end of address 511. “Full page burst” stops the burst
read/write with burst stop command.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
23
EDS51321DBH-TS
Initialization Sequence
The synchronous DRAM is initialized in the power-on sequence according to the following.
(1) To stabilize internal circuits, when power is applied, a 200µs or longer pause must precede any signal toggling.
VDD should be turned on simultaneously or before VDDQ.
(2) After the pause, all banks must be precharged using the Precharge command (The Precharge all banks
command is convenient).
(3) Once the precharge is completed and the minimum tRP is satisfied, two or more auto-refresh must be performed.
(4) Both the mode register and the extended mode register must be programmed. After the mode register set cycle
or the extended mode register set cycle, tMRD (2 CLK minimum) pause must be satisfied.
Remarks:
1 The sequence of Auto-refresh, mode register programming and extended mode register programming above may
be transposed.
2 CKE and DQM must be held high until the Precharge command is issued to ensure data-bus High-Z.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
24
EDS51321DBH-TS
Operation of the Mobile RAM
Read/Write Operations
Bank Active
Before executing a read or write operation, the corresponding bank and the row address must be activated by the
bank active (ACT) command. An interval of tRCD is required between the bank active command input and the
following read/write command input.
Read Operation
A read operation starts when a read command is input. Output buffer becomes low-Z in the (/CAS Latency - 1) cycle
after read command set. The Mobile RAM can perform a burst read operation.
The burst length can be set to 1, 2, 4 and 8. The start address for a burst read is specified by the column address
and the bank select address at the read command set cycle. In a read operation, data output starts after the number
of clocks specified by the /CAS Latency. The /CAS Latency can be set to 2 or 3.
When the burst length is 1, 2, 4 and 8 the DOUT buffer automatically becomes high-Z at the next clock after the
successive burst-length data has been output.
The /CAS latency and burst length must be specified at the mode register.
CLK
tRCD
Command
ACT
READ
Address
Row
Column
DQ
out 0
CL = 2
CL = 3
out 1
out 2
out 3
out 0
out 1
out 2
out 3
CL = /CAS latency
Burst Length = 4
/CAS Latency
CLK
tRCD
Command
ACT
READ
Address
Row
Column
BL = 1
out 0
out 0 out 1
DQ
BL = 2
out 0 out 1 out 2 out 3
BL = 4
out 0 out 1 out 2 out 3 out 4 out 5 out 6 out 7
BL = 8
BL : Burst Length
/CAS Latency = 2
Burst Length
Preliminary Data Sheet E1415E21 (Ver. 2.1)
25
EDS51321DBH-TS
Write Operation
Burst write or single write mode is selected by the OPCODE of the mode register.
1. Burst write: A burst write operation is enabled by setting OPCODE (A9, A8) to (0, 0). A burst write starts in the
same clock as a write command set. (The latency of data input is 0 clock.) The burst length can be set to 1, 2, 4
and 8, like burst read operations. The write start address is specified by the column address and the bank select
address at the write command set cycle.
CLK
tRCD
Command
ACT
WRIT
Address
Row
Column
in 0
BL = 1
DQ
in 0
in 1
in 0
in 1
in 2
in 3
in 0
in 1
in 2
in 3
BL = 2
BL = 4
in 4
in 5
in 6
BL = 8
in 7
CL = 2, 3
Burst write
2. Single write: A single write operation is enabled by setting OPCODE (A9, A8) to (1, 0). In a single write
operation, data is only written to the column address and the bank select address specified by the write
command set cycle without regard to the burst length setting. (The latency of data input is 0 clock).
CLK
tRCD
Command
Address
DQ
ACT
Row
WRIT
Column
in 0
Single write
Preliminary Data Sheet E1415E21 (Ver. 2.1)
26
EDS51321DBH-TS
Auto Precharge
During a read or write command cycle, A10 controls whether auto precharge is selected. A10 high in the Read or
Write command (Read with auto precharge command or Write with auto precharge command), auto precharge is
selected and begins automatically. The tRAS must be satisfied with a read with auto precharge or a write with auto
precharge operation. In addition, the next activate command to the bank being precharged cannot be executed until
the precharge cycle ends.
Read with Auto Precharge
In read cycle, once auto precharge has started, an activate command to the bank can be issued after tRP has been
satisfied.
CLK
ACT
CL=2 Command
READA
tRAS
DQ
out0
CL=3 Command
ACT
out1
out2
out3
out0
out1
out2
READA
tRAS
DQ
Note: Internal auto precharge starts at the timing indicated by " ".
And an interval of tRAS is required between previous active (ACT) command and internal precharge "
out3
".
Burst Read (BL = 4)
Write with Auto Precharge
In write cycle, the auto precharge starts at the timing of two clocks after the last data word input to the device.
The tDAL must be satisfied to issue the next activate command to the bank being precharged.
CLK
Command
ACT
ACT
WRITA
tRAS
DQ
in0
in1
in2
in3
tDAL
Note: Internal auto precharge starts at the timing indicated by " ".
and an interval of tRAS is required between previous active (ACT) command
and internal precharge " ".
Burst Write (BL = 4)
Preliminary Data Sheet E1415E21 (Ver. 2.1)
27
EDS51321DBH-TS
CLK
Command
ACT
ACT
WRITA
tRAS
DQ
in
tDAL
Note: Internal auto precharge starts at the timing indicated by " ".
and an interval of tRAS is required between previous active (ACT) command
and internal precharge " ".
Single Write
Preliminary Data Sheet E1415E21 (Ver. 2.1)
28
EDS51321DBH-TS
Burst Stop Command
During a read cycle, when the burst stop command is issued, the burst read data are terminated and the data bus
goes to high-Z after the /CAS latency from the burst stop command.
CLK
Command
READ
BST
DQ
(CL = 2)
out
DQ
(CL = 3)
out
out
out
out
High-Z
out
High-Z
Burst Stop at Read
During a write cycle, when the burst stop command is issued, the burst write data are terminated and data bus goes
to high-Z at the same clock with the burst stop command.
CLK
Command
WRITE
BST
High-Z
DQ
in
in
in
Burst Stop at Write
Preliminary Data Sheet E1415E21 (Ver. 2.1)
29
in
EDS51321DBH-TS
Command Intervals
Read Command to Read Command Interval
1. Same bank, same ROW address: When another read command is executed at the same ROW address of the
same bank as the preceding read command execution, the second read can be performed after an interval of no
less than 1 clock. Even when the first command is a burst read that is not yet finished, the data read by the
second command will be valid.
CLK
Command
ACT
Address
Row
READ
READ
Column A Column B
BS
DQ
out A0 out B0 out B1 out B2 out B3
Bank0
Active
Column =A Column =B Column =A Column =B
Dout
Read
Read
Dout
CL = 3
BL = 4
Bank 0
READ to READ Command Interval (same ROW address in same bank)
2. Same bank, different ROW address: When the ROW address changes on same bank, consecutive read
commands cannot be executed; it is necessary to separate the two read commands with a precharge command
and a bank active command.
3. Different bank: When the bank changes, the second read can be performed after an interval of no less than 1
clock, provided that the other bank is in the bank active state. Even when the first command is a burst read that
is not yet finished, the data read by the second command will be valid.
CLK
Command
Address
ACT
ACT
READ READ
Row 0
Row 1
Column A Column B
BS
DQ
out A0 out B0 out B1 out B2 out B3
Bank0
Active
Bank3 Bank0 Bank3
Active Read Read
Bank0 Bank3
Dout
Dout
READ to READ Command Interval (different bank)
Preliminary Data Sheet E1415E21 (Ver. 2.1)
30
CL = 3
BL = 4
EDS51321DBH-TS
Write Command to Write Command Interval
1. Same bank, same ROW address: When another write command is executed at the same ROW address of the
same bank as the preceding write command, the second write can be performed after an interval of no less than
1 clock. In the case of burst writes, the second write command has priority.
CLK
Command
ACT
Address
Row
WRIT
WRIT
Column A Column B
BS
DQ
in A0
Bank0
Active
in B0
in B1
in B2
in B3
Burst Write Mode
BL = 4
Bank 0
Column =A Column =B
Write
Write
WRITE to WRITE Command Interval (same ROW address in same bank)
2. Same bank, different ROW address: When the ROW address changes, consecutive write commands cannot be
executed; it is necessary to separate the two write commands with a precharge command and a bank active
command.
3. Different bank: When the bank changes, the second write can be performed after an interval of no less than 1
clock, provided that the other bank is in the bank active state. In the case of burst write, the second write
command has priority.
CLK
Command
Address
ACT
ACT
WRIT
Row 0
Row 1
Column A Column B
WRIT
BS
DQ
in A0
Bank0
Active
in B0
in B1
in B2
in B3
Burst Write Mode
BL = 4
Bank3 Bank0 Bank3
Active Write Write
WRITE to WRITE Command Interval (different bank)
Preliminary Data Sheet E1415E21 (Ver. 2.1)
31
EDS51321DBH-TS
Read Command to Write Command Interval
1. Same bank, same ROW address: When the write command is executed at the same ROW address of the same
bank as the preceding read command, the write command can be performed after an interval of no less than 1
clock. However, DQM must be set high so that the output buffer becomes high-Z before data input.
CLK
Command
READ WRIT
CL=2
DQM
CL=3
in B0
DQ (input)
in B1
in B2
in B3
BL = 4
Burst write
High-Z
DQ (output)
READ to WRITE Command Interval (1)
CLK
Command
READ
WRIT
DQM
CL=2
2 clock
out
out
out
in
in
in
in
out
out
in
in
in
in
DQ
CL=3
READ to WRITE Command Interval (2)
2. Same bank, different ROW address: When the ROW address changes, consecutive write commands cannot be
executed; it is necessary to separate the two commands with a precharge command and a bank active
command.
3. Different bank: When the bank changes, the write command can be performed after an interval of no less than 1
cycle, provided that the other bank is in the bank active state. However, DQM must be set high so that the output
buffer becomes high-Z before data input.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
32
EDS51321DBH-TS
Write Command to Read Command Interval:
1. Same bank, same ROW address: When the read command is executed at the same ROW address of the same
bank as the preceding write command, the read command can be performed after an interval of no less than 1
clock. However, in the case of a burst write, data will continue to be written until one clock before the read
command is executed.
CLK
Command
WRIT
READ
DQM
DQ (input)
in A0
DQ (output)
out B0
Column = A
Write
Column = B
Read
out B1
out B2
out B3
Burst Write Mode
CL = 2
BL = 4
Bank 0
/CAS Latency
Column = B
Dout
WRITE to READ Command Interval (1)
CLK
Command
WRIT
READ
DQM
DQ (input)
in A0
in A1
DQ (output)
out B0
Column = A
Write
out B1
/CAS Latency
Column = B
Dout
Column = B
Read
out B2
out B3
Burst Write Mode
CL = 2
BL = 4
Bank 0
WRITE to READ Command Interval (2)
2. Same bank, different ROW address: When the ROW address changes, consecutive read commands cannot be
executed; it is necessary to separate the two commands with a precharge command and a bank active
command.
3. Different bank: When the bank changes, the read command can be performed after an interval of no less than 1
clock, provided that the other bank is in the bank active state. However, in the case of a burst write, data will
continue to be written until one clock before the read command is executed (as in the case of the same bank and
the same address).
Preliminary Data Sheet E1415E21 (Ver. 2.1)
33
EDS51321DBH-TS
Read with Auto Precharge to Read Command Interval
1. Different bank: When some banks are in the active state, the second read command (another bank) is executed.
Even when the first read with auto precharge is a burst read that is not yet finished, the data read by the second
command is valid. The internal auto precharge of one bank starts at the next clock of the second command.
CLK
Command
READA
READ
bank0
Read A
bank3
Read
BS
DQ
out A0
out A1
Note: Internal auto-precharge starts at the timing indicated by "
out B0
out B1
CL= 3
BL = 4
".
Read with Auto Precharge to Read Command Interval (Different bank)
2. Same bank: The consecutive read command (the same bank) is illegal.
Write with Auto Precharge to Write Command Interval
1. Different bank: When some banks are in the active state, the second write command (another bank) is executed.
In the case of burst writes, the second write command has priority. The internal auto precharge of one bank
starts two clocks later from the second command.
CLK
Command
WRITA
WRIT
BS
DQ
in A0
bank0
Write A
in A1
in B1
in B0
in B2
in B3
bank3
Write
BL= 4
Note: Internal auto-precharge starts at the timing indicated by "
".
Write with Auto Precharge to Write Command Interval (Different bank)
2. Same bank: The consecutive write command (the same bank) is illegal.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
34
EDS51321DBH-TS
Read with Auto Precharge to Write Command Interval
1. Different bank: When some banks are in the active state, the second write command (another bank) is executed.
However, DQM must be set high so that the output buffer becomes high-Z before data input. The internal auto
precharge of one bank starts at the next clock of the second command.
CLK
Command
READA
WRIT
BS
CL = 2
DQM
CL = 3
DQ (input)
in B0
DQ (output)
in B1
in B2
in B3
High-Z
bank0
ReadA
BL = 4
bank3
Write
Note: Internal auto-precharge starts at the timing indicated by "
".
Read with Auto Precharge to Write Command Interval (Different bank)
2. Same bank: The consecutive write command from read with auto precharge (the same bank) is illegal. It is
necessary to separate the two commands with a bank active command.
Write with Auto Precharge to Read Command Interval
1. Different bank: When some banks are in the active state, the second read command (another bank) is executed.
However, in case of a burst write, data will continue to be written until one clock before the read command is
executed. The internal auto precharge of one bank starts at two clocks later from the second command.
CLK
Command
WRITA
READ
BS
DQM
DQ (input)
in A0
DQ (output)
out B0
bank0
WriteA
out B1
out B2
out B3
CL = 3
BL = 4
bank3
Read
Note: Internal auto-precharge starts at the timing indicated by "
".
Write with Auto Precharge to Read Command Interval (Different bank)
2. Same bank: The consecutive read command from write with auto precharge (the same bank) is illegal. It is
necessary to separate the two commands with a bank active command.
Preliminary Data Sheet E1415E21 (Ver. 2.1)
35
EDS51321DBH-TS
Read Command to Precharge Command Interval (same bank)
When the precharge command is executed for the same bank as the read command that preceded it, the minimum
interval between the two commands is one clock.
CLK
PRE/PALL
READ
Command
DQ
out A0
out A1
out A2
out A3
CL=2
READ to PRECHARGE Command Interval (same bank): To output all data (CL = 2, BL = 4)
CLK
PRE/PALL
READ
Command
DQ
out A0
out A1
out A2
out A3
CL=3
READ to PRECHARGE Command Interval (same bank): To output all data (CL = 3, BL = 4)
CLK
Command
READ
PRE/PALL
High-Z
DQ
out A0
CL=2
READ to PRECHARGE Command Interval (same bank): To stop output data (CL = 2, BL = 1, 2, 4, 8)
CLK
Command
READ
PRE/PALL
High-Z
DQ
out A0
CL=3
READ to PRECHARGE Command Interval (same bank): To stop output data (CL = 3, BL = 1, 2, 4, 8)
Preliminary Data Sheet E1415E21 (Ver. 2.1)
36
EDS51321DBH-TS
Write Command to Precharge Command Interval (same bank)
When the precharge command is executed for the same bank as the write command that preceded it, the minimum
interval between the two commands is 1 clock. However, if the burst write operation is unfinished, the input data
must be masked by means of DQM for assurance of the clock defined by tDPL.
CLK
Command
PRE/PALL
WRIT
DQM
DQ
in A0
in A1
in A2
tDPL
WRITE to PRECHARGE Command Interval (same bank) (BL = 4 (To stop write operation))
CLK
Command
PRE/PALL
WRIT
DQM
DQ
in A0
in A1
in A2
in A3
tDPL
WRITE to PRECHARGE Command Interval (same bank) (BL = 4 (To write all data))
Preliminary Data Sheet E1415E21 (Ver. 2.1)
37
EDS51321DBH-TS
Bank Active Command Interval
1. Same bank: The interval between the two bank active commands must be no less than tRC.
2. In the case of different bank active commands: The interval between the two bank active commands must be no
less than tRRD.
CLK
Command
ACT
ACT
Address
ROW
ROW
BS
tRC
Bank 0
Active
Bank 0
Active
Bank Active to Bank Active for Same Bank
CLK
ACT
ACT
ROW:0
ROW:1
Command
Address
BS
tRRD
Bank 0
Active
Bank 3
Active
Bank Active to Bank Active for Different Bank
Mode Register or Extended Mode Register Set to Bank Active Command Interval
The interval between setting the mode register or extended mode register and executing a bank active command
must be no less than tMRD.
CLK
Command
MRS
or EMRS
ACT
Address
OPCODE
BS & ROW
tMRD
Mode Register or
Extende Mode Register
Set
Bank
Active
Mode register set to Bank active command interval
Preliminary Data Sheet E1415E21 (Ver. 2.1)
38
EDS51321DBH-TS
DQM Control
The DQM controls data mask function for read and write. Each DQM masks corresponding byte. DQM latency is
different between reading and writing.
Reading
When data is read, the output buffer can be controlled by DQM. By setting DQM to low, the output buffer becomes
low-Z, enabling data output. By setting DQM to high, the output buffer becomes high-Z, and the corresponding data
is not output. However, internal reading operations continue. The latency of DQM during reading is two clocks.
Writing
Input data can be masked by DQM. By setting DQM to low, data can be written. In addition, when DQM is set to
high, the corresponding data is not written, and the previous data is held. The latency of DQM during writing is 0
clock.
CLK
DQM
DQ
High-Z
out 0
out 1
out 3
Latency= 2
Reading
CLK
DQM
DQ
in 0
in 3
in 1
Latency = 0
Writing
Preliminary Data Sheet E1415E21 (Ver. 2.1)
39
EDS51321DBH-TS
Refresh
Auto-Refresh
All the banks must be precharged before executing an auto-refresh command. Since the auto-refresh command
updates the internal counter every time it is executed and determines the banks and the ROW addresses to be
refreshed, external address specification is not required. The refresh cycles are required to refresh all the ROW
addresses within tREF (max.). The output buffer becomes high-Z after auto-refresh start. In addition, since a
precharge has been completed by an internal operation after the auto-refresh, an additional precharge operation by
the precharge command is not required.
Self-Refresh
After executing a self-refresh command, the self-refresh operation continues while CKE is held low. During selfrefresh operation, all ROW addresses are refreshed by the internal refresh timer. A self-refresh is terminated by a
self-refresh exit command. Before and after self-refresh mode, execute auto-refresh to all refresh addresses in or
within tREF (max.) period on the condition 1 and 2 below.
1. Enter self-refresh mode within time as below* after either burst refresh or distributed refresh at equal interval to
all refresh addresses are completed.
2. Start burst refresh or distributed refresh at equal interval to all refresh addresses within time as below*after
exiting from self-refresh mode.
Note: tREF (max.) / refresh cycles.
Others
Power-Down Mode
The Mobile RAM enters power-down mode when CKE goes low in the IDLE state. In power down mode, power
consumption is suppressed by deactivating the input initial circuit. Power down mode continues while CKE is held
low. In addition, by setting CKE to high, the Mobile RAM exits from the power down mode, and command input is
enabled from the next clock. In this mode, internal refresh is not performed.
Clock Suspend Mode
By driving CKE to low during a bank active or read/write operation, the Mobile RAM enters clock suspend mode.
During clock suspend mode, external input signals are ignored and the internal state is maintained. When CKE is
driven high, the Mobile RAM terminates clock suspend mode, and command input is enabled from the next clock.
For details, refer to the "CKE Truth Table".
Preliminary Data Sheet E1415E21 (Ver. 2.1)
40
EDS51321DBH-TS
Timing Waveforms
Read Cycle
tCK
tCH t CL
CLK
t RC
VIH
CKE
t RP
tRAS
tRCD
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
/CS
tSI tHI
tSI tHI
/RAS
tSI tHI
tSI tHI
/CAS
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
/WE
tSI tHI
BS
tSI tHI
tSI tHI
A10
tSI tHI
tSI tHI
tSI tHI
Address
tSI
tHI
DQM
DQ (input)
tAC
tAC
tAC
tHZ
DQ (output)
t AC
tOH
tOH
Bank 0
Active
Bank 0
Read
tLZ
tOH
Bank 0
Precharge
Preliminary Data Sheet E1415E21 (Ver. 2.1)
41
tOH
/CAS latency = 2
Burst length = 4
Bank 0 access
= VIH or VIL
= VOH or VOL
EDS51321DBH-TS
Write Cycle
tCK
tCH tCL
CLK
tRC
VIH
CKE
tRP
tRAS
tRCD
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
/CS
tSI tHI
tSI tHI
/RAS
tSI tHI
tSI tHI
/CAS
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
tSI tHI
/WE
tSI tHI
tSI tHI
BS
tSI tHI
tSI tHI
A10
tSI tHI
tSI tHI
tSI tHI
Address
tSI
tHI
DQM
tSI
t HI
tSI
tHI tSI
tHI
tSI
tHI
DQ (input)
tDPL
DQ (output)
Bank 0
Active
Bank 0
Precharge
Bank 0
Write
Preliminary Data Sheet E1415E21 (Ver. 2.1)
42
CL = 2
BL = 4
Bank 0 access
= VIH or VIL
EDS51321DBH-TS
Mode Register Set Cycle
CLK
CKE
VIH
/CS
/RAS
/CAS
/WE
BA0
BA1
Address
code
valid
R: b
DQM
DQ (output)
High-Z
DQ (input)
tMRD
tRP
Precharge
If needed
Mode
register
Set
= VIH or VIL
Bank 3
Active
Extended Mode Register Set Cycle
CLK
CKE
VIH
/CS
/RAS
/CAS
/WE
BA0
BA1
Address
code
valid
R: b
DQM
DQ (output)
High-Z
DQ (input)
tMRD
tRP
Precharge
If needed
Extended
mode
register
Set
= VIH or VIL
Bank 3
Active
Preliminary Data Sheet E1415E21 (Ver. 2.1)
43
EDS51321DBH-TS
Read Cycle/Write Cycle
CLK
CKE
VIH
Read cycle
/RAS-/CAS delay = 3
/CAS latency = 3
Burst length = 4
= VIH or VIL
/CS
/RAS
/CAS
/WE
BS
Address
R:a
C:a
R:b
Bank 0
Active
Bank 0
Read
Bank 3
Active
C:b
C:b'
C:b"
DQM
DQ (output)
DQ (input)
CKE
a
a+1 a+2 a+3
b
b+1 b+2 b+3 b'
b'+1 b"
b"+1 b"+2 b"+3
High-Z
Bank 3 Bank 0
Read
Precharge
Bank 3
Read
Bank 3
Read
Bank 3
Precharge
VIH
Write cycle
/RAS-/CAS delay = 3
/CAS latency = 3
Burst length = 4
= VIH or VIL
/CS
/RAS
/CAS
/WE
BS
Address
R:a
C:a
R:b
C:b
C:b'
C:b"
DQM
High-Z
DQ (output)
DQ (input)
a
Bank 0
Active
a+1 a+2 a+3
Bank 0
Write
Bank 3
Active
b
b+1 b+2 b+3 b'
Bank 3
Write
Bank 0
Precharge
b'+1 b"
Bank 3
Write
b"+1 b"+2 b"+3
Bank 3
Write
Bank 3
Precharge
Read/Single Write Cycle
CLK
CKE
VIH
/CS
/RAS
/CAS
/WE
BS
R:a
Address
C:a
R:b
C:a' C:a
DQM
a
DQ (input)
DQ (output)
a
Bank 0
Active
CKE
Bank 0
Read
Bank 3
Active
C:a
R:b
a+1 a+2 a+3
a
Bank 0 Bank 0
Read
Write
a+1 a+2 a+3
Bank 0
Precharge
Bank 3
Precharge
VIH
/CS
/RAS
/CAS
/WE
BS
Address
R:a
C:a
C:b C:c
a
b
DQM
DQ (input)
DQ (output)
a
Bank 0
Active
Bank 0
Read
a+1
c
a+3
Bank 0
Write
Bank 3
Active
Bank 0 Bank 0
Write
Write
Bank 0
Precharge
Read/Single write
/RAS-/CAS delay = 3
/CAS latency = 3
Burst length = 4
= VIH or VIL
Preliminary Data Sheet E1415E21 (Ver. 2.1)
44
EDS51321DBH-TS
Read/Burst Write Cycle
CLK
CKE
/CS
/RAS
/CAS
/WE
BS
R:a
Address
C:a
R:b
C:a'
DQM
a
DQ (input)
DQ (output)
a
Bank 0
Active
Bank 0
Read
Bank 3
Active
C:a
R:b
a+1 a+2 a+3
a+1 a+2 a+3
Clock
suspend
Bank 0
Precharge
Bank 0
Write
Bank 3
Precharge
VIH
CKE
/CS
/RAS
/CAS
/WE
BS
R:a
Address
C:a
DQM
a
DQ (input)
DQ (output)
a
Bank 0
Active
Bank 0
Read
a+1
a+1 a+2 a+3
a+3
Bank 0
Write
Bank 3
Active
Bank 0
Precharge
Read/Burst write
/RAS-/CAS delay = 3
/CAS latency = 3
Burst length = 4
= VIH or VIL
Auto-Refresh Cycle
CLK
CKE
VIH
/CS
/RAS
/CAS
/WE
BS
Address
R:a
A10=1
C:a
DQM
DQ (input)
a
High-Z
DQ (output)
t RP
Precharge
If needed
tRFC
Auto-Refresh
a+1
tRFC
Auto-Refresh
Preliminary Data Sheet E1415E21 (Ver. 2.1)
45
Active
Bank 0
Read
Bank 0
Refresh cycle and
Read cycle
/RAS-/CAS delay = 2
/CAS latency = 2
Burst length = 4
= VIH or VIL
EDS51321DBH-TS
Self-Refresh Cycle
CLK
CKE Low
CKE
/CS
/RAS
/CAS
/WE
BS
Address
A10=1
DQM
DQ (input)
High-Z
DQ (output)
tRP
Precharge command
If needed
tSREX
tSREX
Self-refresh entry
command
Next AutoNext
Self-refresh Self-refresh
clock refresh
exit
clock entry
enable command ignore command enable
or No operation
Self-refresh exit
ignore command
or No operation
Self refresh cycle
/RAS-/CAS delay = 3
CL = 3
BL = 4
= VIH or VIL
Clock Suspend Mode
tSI
tSI
tHI
CLK
CKE
Read cycle
/RAS-/CAS delay = 2
/CAS latency = 2
Burst length = 4
= VIH or VIL
/CS
/RAS
/CAS
/WE
BS
Address
R:a
C:a
R:b
C:b
DQM
DQ (output)
a
a+1 a+2
a+3
b
b+1 b+2 b+3
High-Z
DQ (input)
Bank0 Active clock
Active suspend start
Active clock Bank0
suspend end Read
Bank3
Active
Read suspend
start
Read suspend
end
Bank3
Read
Bank0
Precharge
Earliest Bank3
Precharge
CKE
Write cycle
/RAS-/CAS delay = 2
/CAS latency = 2
Burst length = 4
= VIH or VIL
/CS
/RAS
/CAS
/WE
BS
Address
C:a R:b
R:a
C:b
DQM
High-Z
DQ (output)
DQ (input)
a
Bank0
Active
Active clock
suspend start
a+1 a+2
Active clock Bank0 Bank3
supend end Write Active
Write suspend
start
a+3 b
Write suspend
end
Preliminary Data Sheet E1415E21 (Ver. 2.1)
46
b+1 b+2 b+3
Bank3 Bank0
Write Precharge
Earliest Bank3
Precharge
EDS51321DBH-TS
Power Down Mode
CLK
CKE Low
CKE
/CS
/RAS
/CAS
/WE
BS
Address
R: a
A10=1
DQM
DQ (input)
High-Z
DQ (output)
tRP
Precharge command
If needed
Power down cycle
Power down entry
Power down
/RAS-/CAS delay = 3
mode exit
Active Bank 0 /CAS latency = 3
Burst length = 4
= VIH or VIL
Initialization Sequence
CLK
CKE
VIH
/CS
/RAS
/CAS
/WE
DQM
code
valid
Address
code
Valid
VIH
High-Z
DQ
All banks
Precharge
tMRD
tRFC
t RFC
tRP
Auto-Refresh
Auto-Refresh
Preliminary Data Sheet E1415E21 (Ver. 2.1)
47
Mode
register
Set
Extended
mode
register
Set
tMRD
Bank active
If needed
EDS51321DBH-TS
Package Drawing
90-ball FBGA
Solder ball: Lead free (Sn-Ag-Cu)
Unit: mm
8.0 ± 0.1
0.2 S A
13.0 ± 0.1
INDEX MARK
0.2 S B
0.2 S
1.0 max.
S
0.1 S
0.35 ± 0.05
90-φ0.45 ± 0.05
φ0.08 M S A B
0.8
A
11.2
B
INDEX MARK
1.6 0.8
6.4
ECA-TS2-0238-01
Preliminary Data Sheet E1415E21 (Ver. 2.1)
48
EDS51321DBH-TS
Recommended Soldering Conditions
Please consult with our sales offices for soldering conditions of the EDS51321DBH.
Type of Surface Mount Device
EDS51321DBH: 90-ball FBGA < Lead free (Sn-Ag-Cu) >
Preliminary Data Sheet E1415E21 (Ver. 2.1)
49
EDS51321DBH-TS
NOTES FOR CMOS DEVICES
1
PRECAUTION AGAINST ESD FOR MOS DEVICES
Exposing the MOS devices to a strong electric field can cause destruction of the gate
oxide and ultimately degrade the MOS devices operation. Steps must be taken to stop
generation of static electricity as much as possible, and quickly dissipate it, when once
it has occurred. Environmental control must be adequate. When it is dry, humidifier
should be used. It is recommended to avoid using insulators that easily build static
electricity. MOS devices must be stored and transported in an anti-static container,
static shielding bag or conductive material. All test and measurement tools including
work bench and floor should be grounded. The operator should be grounded using
wrist strap. MOS devices must not be touched with bare hands. Similar precautions
need to be taken for PW boards with semiconductor MOS devices on it.
2
HANDLING OF UNUSED INPUT PINS FOR CMOS DEVICES
No connection for CMOS devices input pins can be a cause of malfunction. If no
connection is provided to the input pins, it is possible that an internal input level may be
generated due to noise, etc., hence causing malfunction. CMOS devices behave
differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed
high or low by using a pull-up or pull-down circuitry. Each unused pin should be connected
to VDD or GND with a resistor, if it is considered to have a possibility of being an output
pin. The unused pins must be handled in accordance with the related specifications.
3
STATUS BEFORE INITIALIZATION OF MOS DEVICES
Power-on does not necessarily define initial status of MOS devices. Production process
of MOS does not define the initial operation status of the device. Immediately after the
power source is turned ON, the MOS devices with reset function have not yet been
initialized. Hence, power-on does not guarantee output pin levels, I/O settings or
contents of registers. MOS devices are not initialized until the reset signal is received.
Reset operation must be executed immediately after power-on for MOS devices having
reset function.
CME0107
Preliminary Data Sheet E1415E21 (Ver. 2.1)
50
EDS51321DBH-TS
Mobile RAM is a trademark of Elpida Memory, Inc.
The information in this document is subject to change without notice. Before using this document, confirm that this is the latest version.
No part of this document may be copied or reproduced in any form or by any means without the prior
written consent of Elpida Memory, Inc.
Elpida Memory, Inc. does not assume any liability for infringement of any intellectual property rights
(including but not limited to patents, copyrights, and circuit layout licenses) of Elpida Memory, Inc. or
third parties by or arising from the use of the products or information listed in this document. No license,
express, implied or otherwise, is granted under any patents, copyrights or other intellectual property
rights of Elpida Memory, Inc. or others.
Descriptions of circuits, software and other related information in this document are provided for
illustrative purposes in semiconductor product operation and application examples. The incorporation of
these circuits, software and information in the design of the customer's equipment shall be done under
the full responsibility of the customer. Elpida Memory, Inc. assumes no responsibility for any losses
incurred by customers or third parties arising from the use of these circuits, software and information.
[Product applications]
Be aware that this product is for use in typical electronic equipment for general-purpose applications.
Elpida Memory, Inc. makes every attempt to ensure that its products are of high quality and reliability.
However, users are instructed to contact Elpida Memory's sales office before using the product in
aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment,
medical equipment for life support, or other such application in which especially high quality and
reliability is demanded or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury.
[Product usage]
Design your application so that the product is used within the ranges and conditions guaranteed by
Elpida Memory, Inc., including the maximum ratings, operating supply voltage range, heat radiation
characteristics, installation conditions and other related characteristics. Elpida Memory, Inc. bears no
responsibility for failure or damage when the product is used beyond the guaranteed ranges and
conditions. Even within the guaranteed ranges and conditions, consider normally foreseeable failure
rates or failure modes in semiconductor devices and employ systemic measures such as fail-safes, so
that the equipment incorporating Elpida Memory, Inc. products does not cause bodily injury, fire or other
consequential damage due to the operation of the Elpida Memory, Inc. product.
[Usage environment]
Usage in environments with special characteristics as listed below was not considered in the design.
Accordingly, our company assumes no responsibility for loss of a customer or a third party when used in
environments with the special characteristics listed below.
Example:
1) Usage in liquids, including water, oils, chemicals and organic solvents.
2) Usage in exposure to direct sunlight or the outdoors, or in dusty places.
3) Usage involving exposure to significant amounts of corrosive gas, including sea air, CL 2 , H 2 S, NH 3 ,
SO 2 , and NO x .
4) Usage in environments with static electricity, or strong electromagnetic waves or radiation.
5) Usage in places where dew forms.
6) Usage in environments with mechanical vibration, impact, or stress.
7) Usage near heating elements, igniters, or flammable items.
If you export the products or technology described in this document that are controlled by the Foreign
Exchange and Foreign Trade Law of Japan, you must follow the necessary procedures in accordance
with the relevant laws and regulations of Japan. Also, if you export products/technology controlled by
U.S. export control regulations, or another country's export control laws or regulations, you must follow
the necessary procedures in accordance with such laws or regulations.
If these products/technology are sold, leased, or transferred to a third party, or a third party is granted
license to use these products, that third party must be made aware that they are responsible for
compliance with the relevant laws and regulations.
M01E0706
Preliminary Data Sheet E1415E21 (Ver. 2.1)
51