Infineon HYB25D256160BTL-5A 256mbit double data rata sdram Datasheet

HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum Jan. 2003, V0.9
Features
CAS Latency and Clock Frequency
CAS Latency
2
2.5
3
Maximum Operating Frequency (MHz)
DDR400B
DDR400A
-5
-5A
133
133
166
200
200
200
• Double data rate architecture: two data transfers
per clock cycle
• Bidirectional data strobe (DQS) is transmitted
and received with data, to be used in capturing
data at the receiver
• DQS is edge-aligned with data for reads and is
center-aligned with data for writes
• Differential clock inputs (CK and CK)
• Four internal banks for concurrent operation
• Data mask (DM) for write data
• DLL aligns DQ and DQS transitions with CK
transitions
• Commands entered on each positive CK edge;
data and data mask referenced to both edges of
DQS
• Burst Lengths: 2, 4, or 8
• CAS Latency: (1.5), 2, 2.5, (3)
• Auto Precharge option for each burst access
• Auto Refresh and Self Refresh Modes
• 7.8ms Maximum Average Periodic Refresh
Interval (8k refresh)
• 2.5V (SSTL_2 compatible) I/O
• VDDQ = 2.6V ± 0.1V / VDD = 2.6V ± 0.1V
• TSOP66 package
Description
The 256Mb DDR SDRAM is a high-speed CMOS,
dynamic random-access memory containing 268,435,456
bits. It is internally configured as a quad-bank DRAM.
dent with the Read or Write command are used to select
the bank and the starting column location for the burst
access.
The 256Mb DDR SDRAM uses a double-data-rate architecture to achieve high-speed operation. The double data
rate architecture is essentially a 2n prefetch architecture
with an interface designed to transfer two data words per
clock cycle at the I/O pins. A single read or write access
for the 256Mb DDR SDRAM effectively consists of a single 2n-bit wide, one clock cycle data transfer at the internal DRAM core and two corresponding n-bit wide, onehalf-clock-cycle data transfers at the I/O pins.
The DDR SDRAM provides for programmable Read or
Write burst lengths of 2, 4 or 8 locations. An Auto Precharge function may be enabled to provide a self-timed
row precharge that is initiated at the end of the burst
access.
A bidirectional data strobe (DQS) is transmitted externally,
along with data, for use in data capture at the receiver.
DQS is a strobe transmitted by the DDR SDRAM during
Reads and by the memory controller during Writes. DQS
is edge-aligned with data for Reads and center-aligned
with data for Writes.
The 256Mb DDR SDRAM operates from a differential
clock (CK and CK; the crossing of CK going HIGH and CK
going LOW is referred to as the positive edge of CK).
Commands (address and control signals) are registered at
every positive edge of CK. Input data is registered on both
edges of DQS, and output data is referenced to both
edges of DQS, as well as to both edges of CK.
As with standard SDRAMs, the pipelined, multibank architecture of DDR SDRAMs allows for concurrent operation,
thereby providing high effective bandwidth by hiding row
precharge and activation time.
An auto refresh mode is provided along with a power-saving power-down mode. All inputs are compatible with the
JEDEC Standard for SSTL_2. All outputs are SSTL_2,
Class II compatible.
Note: The functionality described and the timing specifications included in this data sheet are for the DLL Enabled
mode of operation.
Read and write accesses to the DDR SDRAM are burst
oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration
of an Active command, which is then followed by a Read
or Write command. The address bits registered coincident
with the Active command are used to select the bank and
row to be accessed. The address bits registered coinci2003-01-10, V0.9
Page 1 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Ordering Information
Part Numbera
Org.
HYB25D256800BT(L)-5A x8
CAS-RCD-RP Clock CAS-RCD-RP Clock CAS-RCD-RP Clock
Speed
Latencies
(MHz) Latencies
(MHz) Latencies
(MHz)
3-3-3
200
2.5-3-3
200
2-3-3
133
Package
DDR400A 66 Pin TSOP-II
HYB25D256160BT(L)-5A x16
HYB25D256800BT(L)-5
x8
HYB25D256160BT(L)-5
x16
166
DDR400B
a. HYB: designator for memory components
25D: DDR-I SDRAMs at Vddq=2.5V
256: 256Mb density
400/800/160: Product variations x4, x8 and x16
B: Die revision B
C/T: Package type FBGA and TSOP
L: Low power version (optional) - these components are specifically selected for low IDD6 Self Refresh currents
-5: speed grade - see table
Page 2 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Pin Configuration (TSOP66)
VDD
VDD
VDD
1
66
VSS
VSS
VSS
NC
DQ0
VDDQ
NC
DQ0
VDDQ
DQ1
2
3
4
65
64
63
DQ15
VSSQ
DQ14
DQ7
VSSQ
NC
NC
VSSQ
NC
5
62
DQ13
DQ6
DQ3
VDDQ
NC
DQ5
VSSQ
NC
VDDQ
NC
NC
VSSQ
NC
VDDQ
NC
DQ0
DQ1
DQ2
VSSQ
NC
NC
VDDQ
NC
VSSQ
NC
DQ2
VDDQ
NC
VSSQ
DQ3
DQ4
VDDQ
DQ5
6
7
8
9
10
61
60
59
58
57
VDDQ
DQ12
DQ11
VSSQ
DQ10
DQ1
DQ3
DQ6
11
56
DQ9
DQ4
DQ2
VSSQ
VSSQ
VSSQ
12
55
VDDQ
VDDQ
VDDQ
NC
NC
NC
NC
DQ7
NC
VDDQ
NC
VDDQ
NC
VDDQ
LDQS
13
14
15
16
54
53
52
51
DQ8
NC
VSSQ
UDQS
NC
NC
VSSQ
DQS
NC
NC
VSSQ
DQS
NC
VDD
NC
NC
VDD
NC
NC
VDD
NC
17
18
19
50
49
48
NC
VREF
VSS
NC
VREF
VSS
NC
VREF
VSS
20
47
UDM
DM
DM
46
45
44
CK
CK
CK
CK
CK
CK
NC
NC
LDM
WE
CAS
WE
CAS
WE
CAS
RAS
RAS
RAS
21
22
23
CKE
CKE
CKE
CS
NC
CS
NC
CS
NC
24
25
43
42
NC
A12
NC
A12
NC
A12
BA0
BA1
A10/AP
BA0
BA1
A10/AP
BA0
BA1
A10/AP
A11
A9
A8
A11
A9
A8
A0
A1
A2
A0
A1
A2
41
40
39
38
A11
A9
A8
A0
A1
A2
26
27
28
29
A7
A7
A7
30
31
37
36
A6
A5
A6
A5
A6
A5
A3
VDD
A3
VDD
A3
VDD
32
33
35
34
A4
VSS
A4
VSS
A4
VSS
16Mb x 16
32Mb x 8
64Mb x 4
2003-01-10, V0.9
Page 3 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Input/Output Functional Description
Symbol
Type
Function
CK, CK
Input
Clock: CK and CK are differential clock inputs. All address and control input signals are sampled on the crossing of the positive edge of CK and negative edge of CK. Output (read) data
is referenced to the crossings of CK and CK (both directions of crossing).
CKE
Input
Clock Enable: CKE HIGH activates, and CKE Low deactivates, internal clock signals and
device input buffers and output drivers. Taking CKE Low provides Precharge Power-Down
and Self Refresh operation (all banks idle), or Active Power-Down (row Active in any bank).
CKE is synchronous for power down entry and exit, and for self refresh entry. CKE is asynchronous for self refresh exit. CKE must be maintained high throughout read and write
accesses. Input buffers, excluding CK, CK and CKE are disabled during power-down. Input
buffers, excluding CKE, are disabled during self refresh.
CS
Input
Chip Select: All commands are masked when CS is registered HIGH. CS provides for external bank selection on systems with multiple banks. CS is considered part of the command
code. The standard pinout includes one CS pin.
RAS, CAS, WE
Input
Command Inputs: RAS, CAS and WE (along with CS) define the command being entered.
DM
Input
Input Data Mask: DM is an input mask signal for write data. Input data is masked when DM
is sampled HIGH coincident with that input data during a Write access. DM is sampled on
both edges of DQS. Although DM pins are input only, the DM loading matches the DQ and
DQS loading.
BA0, BA1
Input
Bank Address Inputs: BA0 and BA1 define to which bank an Active, Read, Write or Precharge command is being applied. BA0 and BA1 also determines if the mode register or
extended mode register is to be accessed during a MRS or EMRS cycle.
A0 - A12
Input
Address Inputs: Provide the row address for Active commands, and the column address
and Auto Precharge bit for Read/Write commands, to select one location out of the memory
array in the respective bank. A10 is sampled during a Precharge command to determine
whether the Precharge applies to one bank (A10 LOW) or all banks (A10 HIGH). If only one
bank is to be precharged, the bank is selected by BA0, BA1. The address inputs also provide
the op-code during a Mode Register Set command.
DQ
Input/Output
Data Input/Output: Data bus.
DQS
Input/Output
Data Strobe: Output with read data, input with write data. Edge-aligned with read data, centered in write data. Used to capture write data.
NC
No Connect: No internal electrical connection is present.
VDDQ
Supply
DQ Power Supply: 2.6V ± 0.1V.
VSSQ
Supply
DQ Ground
VDD
Supply
Power Supply: 2.6V ± 0.1V.
VSS
Supply
Ground
VREF
Supply
SSTL_2 reference voltage: (VDDQ / 2)
Page 4 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Control Logic
2
Bank2
Bank3
CK, CK
DLL
2
8192
8
512
(x16)
1
16
16
Write
FIFO
&
Drivers
1
1
8
8
8
clk clk
out in Data
8
2
9
Column-Address
Counter/Latch
COL0
1
CK,
CK
DQ0-DQ7,
DM
DQS
Input
Register
1
Mask 1
16
Column
Decoder
10
8
DQS
Generator
COL0
I/O Gating
DM Mask Logic
Drivers
16
Sense Amplifiers
Data
8
MUX
Bank0
Memory
Array
(8192 x 512x 16)
Read Latch
8192
DQS
1
Receivers
15
Address Register
A0-A12,
BA0, BA1
Refresh Counter 13
13
13
Bank Control Logic
Mode
Registers
Bank0
Row-Address Latch
& Decoder
Bank1
Row-Address MUX
CKE
CK
CK
CS
WE
CAS
RAS
Command
Decode
Block Diagram (32Mb x 8)
8
COL0
1
Note: This Functional Block Diagram is intended to facilitate user understanding of the operation of
the device; it does not represent an actual circuit implementation.
Note: DM is a unidirectional signal (input only), but is internally loaded to match the load of the bidirectional DQ and DQS signals.
2003-01-10, V0.9
Page 5 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Control Logic
2
Bank2
Bank3
CK, CK
DLL
2
8192
16
256
(x32)
1
32
32
Write
FIFO
&
Drivers
1
1
16
16
16
clk clk
out in Data
16
2
8
Column-Address
Counter/Latch
COL0
1
CK,
CK
DQ0-DQ15,
DM
DQS
Input
Register
1
Mask 1
32
Column
Decoder
9
16
DQS
Generator
COL0
I/O Gating
DM Mask Logic
Drivers
32
Sense Amplifiers
Data
16
MUX
Bank0
Memory
Array
(8192 x 256x 32)
Read Latch
8192
LDQS, UDQS
1
Receivers
15
Address Register
A0-A11,
BA0, BA1
Refresh Counter 13
13
13
Bank Control Logic
Mode
Registers
Bank0
Row-Address Latch
& Decoder
Bank1
Row-Address MUX
CKE
CK
CK
CS
WE
CAS
RAS
Command
Decode
Block Diagram (16Mb x 16)
16
COL0
2
Note: This Functional Block Diagram is intended to facilitate user understanding of the operation of
the device; it does not represent an actual circuit implementation.
Note: UDM and LDM are unidirectional signals (input only), but is internally loaded to match the
load of the bidirectional DQ , UDQS and LDQS signals.
Page 6 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Functional Description
The 256Mb DDR SDRAM is a high-speed CMOS, dynamic random-access memory containing 268, 435, 456
bits. The 256Mb DDR SDRAM is internally configured as a quad-bank DRAM.
The 256Mb DDR SDRAM uses a double-data-rate architecture to achieve high-speed operation. The doubledata-rate architecture is essentially a 2n prefetch architecture, with an interface designed to transfer two data
words per clock cycle at the I/O pins. A single read or write access for the 256Mb DDR SDRAM consists of a
single 2n-bit wide, one clock cycle data transfer at the internal DRAM core and two corresponding n-bit wide,
one-half clock cycle data transfers at the I/O pins.
Read and write accesses to the DDR SDRAM are burst oriented; accesses start at a selected location and
continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration of an Active command, which is then followed by a Read or Write command. The address bits registered coincident with the Active command are used to select the bank and row to be accessed (BA0, BA1
select the bank; A0-A12 select the row). The address bits registered coincident with the Read or Write command are used to select the starting column location for the burst access.
Prior to normal operation, the DDR SDRAM must be initialized. The following sections provide detailed information covering device initialization, register definition, command descriptions and device operation.
Initialization
DDR SDRAMs must be powered up and initialized in a predefined manner. Operational procedures other
than those specified may result in undefined operation. The following criteria must be met:
No power sequencing is specified during power up or power down given the following criteria:
VDD and VDDQ are driven from a single power converter output AND
VTT meets the specification AND
VREF tracks VDDQ/2
or
The following relationship must be followed:
VDDQ is driven after or with VDD such that VDDQ < VDD + 0.3 V
VTT is driven after or with VDDQ such that VTT < VDDQ + 0.3V
VREF is driven after or with VDDQ such that VREF < VDDQ + 0.3V
The DQ and DQS outputs are in the High-Z state, where they remain until driven in normal operation (by a
read access). After all power supply and reference voltages are stable, and the clock is stable, the DDR
SDRAM requires a 200ms delay prior to applying an executable command.
Once the 200ms delay has been satisfied, a Deselect or NOP command should be applied, and CKE should
be brought HIGH. Following the NOP command, a Precharge ALL command should be applied. Next a Mode
Register Set command should be issued for the Extended Mode Register, to enable the DLL, then a Mode
Register Set command should be issued for the Mode Register, to reset the DLL, and to program the operating parameters. 200 clock cycles are required between the DLL reset and any executable command. During
the 200 cycles of clock for DLL locking, a Deselect or NOP command must be applied. After the 200 clock
cycles, a Precharge ALL command should be applied, placing the device in the “all banks idle” state.
Once in the idle state, two AUTO REFRESH cycles must be performed. Additionally, a Mode Register Set
command for the Mode Register, with the reset DLL bit deactivated (i.e. to program operating parameters
without resetting the DLL) must be performed. Following these cycles, the DDR SDRAM is ready for normal
operation.
2003-01-10, V0.9
Page 7 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Register Definition
Mode Register
The Mode Register is used to define the specific mode of operation of the DDR SDRAM. This definition
includes the selection of a burst length, a burst type, a CAS latency, and an operating mode. The Mode Register is programmed via the Mode Register Set command (with BA0 = 0 and BA1 = 0) and retains the stored
information until it is programmed again or the device loses power (except for bit A8, which is self-clearing).
Mode Register bits A0-A2 specify the burst length, A3 specifies the type of burst (sequential or interleaved),
A4-A6 specify the CAS latency, and A7-A12 specify the operating mode.
The Mode Register must be loaded when all banks are idle, and the controller must wait the specified time
before initiating the subsequent operation. Violating either of these requirements results in unspecified operation.
Burst Length
Read and write accesses to the DDR SDRAM are burst oriented, with the burst length being programmable.
The burst length determines the maximum number of column locations that can be accessed for a given
Read or Write command. Burst lengths of 2, 4, or 8 locations are available for both the sequential and the
interleaved burst types.
Reserved states should not be used, as unknown operation or incompatibility with future versions may result.
When a Read or Write command is issued, a block of columns equal to the burst length is effectively
selected. All accesses for that burst take place within this block, meaning that the burst wraps within the block
if a boundary is reached. The block is uniquely selected by A1-Ai when the burst length is set to two, by A2-Ai
when the burst length is set to four and by A3-Ai when the burst length is set to eight (where Ai is the most
significant column address bit for a given configuration). The remaining (least significant) address bit(s) is
(are) used to select the starting location within the block. The programmed burst length applies to both Read
and Write bursts.
Page 8 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Mode Register Operation
BA1
BA0
0*
0*
A12 - A9
0
A8
0
A12
A11 A10
A9
A8
A7
0
A5
A4
CAS Latency
Operating Mode
A7
A6
A3
BT
A2
Burst Length
A6 - A0
Operating Mode
Valid
Normal operation
Do not reset DLL
A3
Burst Type
0
Sequential
Valid
Normal operation
in DLL Reset
1
Interleave
0
1
0
0
0
1
Reserved
-
-
-
Reserved
CAS Latency
A1
A0
Address Bus
Mode Register
Burst Length
A6
A5
A4
Latency
A2
A1
A0
Burst Length
0
0
0
Reserved
0
0
0
Reserved
0
0
1
Reserved
0
0
1
2
0
1
0
2
0
1
0
4
0
1
1
3 (optional)
0
1
1
8
1
0
0
Reserved
1
0
0
Reserved
1
0
1
1.5 (optional)
1
0
1
Reserved
1
1
0
2.5
1
1
0
Reserved
1
1
1
Reserved
1
1
1
Reserved
* BA0 and BA1 must be 0, 0 to select the Mode Register
(vs. the Extended Mode Register).
2003-01-10, V0.9
Page 9 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Burst Definition
Starting Column Address
Order of Accesses Within a Burst
Burst Length
A2
A1
A0
Type = Sequential
Type = Interleaved
0
0-1
0-1
1
1-0
1-0
0
0
0-1-2-3
0-1-2-3
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
0
0
0
0-1-2-3-4-5-6-7
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
2
4
8
Notes:
1. For a burst length of two, A1-Ai selects the two-data-element block; A0 selects the first access within the
block.
2. For a burst length of four, A2-Ai selects the four-data-element block; A0-A1 selects the first access within
the block.
3. For a burst length of eight, A3-Ai selects the eight-data- element block; A0-A2 selects the first access
within the block.
4. Whenever a boundary of the block is reached within a given sequence above, the following access wraps
within the block.
Burst Type
Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as
the burst type and is selected via bit A3. The ordering of accesses within a burst is determined by the burst
length, the burst type and the starting column address, as shown in Burst Definition on page 10.
Read Latency
The Read latency, or CAS latency, is the delay, in clock cycles, between the registration of a Read command
and the availability of the first burst of output data. The latency can be programmed 2, 2.5 or 3 clocks. CAS
latency of 1.5 is an optional feature on this device.
If a Read command is registered at clock edge n, and the latency is m clocks, the data is available nominally
coincident with clock edge n + m.
Reserved states should not be used as unknown operation or incompatibility with future versions may result.
Page 10 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Operating Mode
The normal operating mode is selected by issuing a Mode Register Set Command with bits A7-A12 set to
zero, and bits A0-A6 set to the desired values. A DLL reset is initiated by issuing a Mode Register Set command with bits A7 and A9-A12 each set to zero, bit A8 set to one, and bits A0-A6 set to the desired values. A
Mode Register Set command issued to reset the DLL should always be followed by a Mode Register Set
command to select normal operating mode.
All other combinations of values for A7-A12 are reserved for future use and/or test modes. Test modes and
reserved states should not be used as unknown operation or incompatibility with future versions may result.
Required CAS Latencies
CAS Latency = 2, BL = 4
CK
CK
Command
Read
NOP
NOP
NOP
NOP
NOP
CL=2
DQS
DQ
CAS Latency = 2.5, BL = 4
CK
CK
Command
Read
NOP
NOP
NOP
NOP
NOP
CL=2.5
DQS
DQ
Shown with nominal tAC, tDQSCK, and tDQSQ.
2003-01-10, V0.9
Don’t Care
Page 11 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Extended Mode Register
The Extended Mode Register controls functions beyond those controlled by the Mode Register; these additional functions include DLL enable/disable, and output drive strength selection (optional). These functions
are controlled via the bits shown in the Extended Mode Register Definition. The Extended Mode Register is
programmed via the Mode Register Set command (with BA0 = 1 and BA1 = 0) and retains the stored information until it is programmed again or the device loses power. The Extended Mode Register must be loaded
when all banks are idle, and the controller must wait the specified time before initiating any subsequent operation. Violating either of these requirements result in unspecified operation.
DLL Enable/Disable
The DLL must be enabled for normal operation. DLL enable is required during power up initialization, and
upon returning to normal operation after having disabled the DLL for the purpose of debug or evaluation. The
DLL is automatically disabled when entering self refresh operation and is automatically re-enabled upon exit
of self refresh operation. Any time the DLL is enabled, 200 clock cycles must occur before a Read command
can be issued. This is the reason 200 clock cycles must occur before issuing a Read or Write command upon
exit of self refresh operation.
Output Drive Strength
The normal drive strength for all outputs is specified to be SSTL_2, Class II. In addition this design version
supports a weak driver mode for lighter load and/or point-to-point environments which can be activated during
mode register set. I-V curves for the normal and weak drive strength are included in this document.
Page 12 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Extended Mode Register Definition
BA1
BA0
0*
1*
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
Operating Mode
A2
A1
A0
Address Bus
0
DS
DLL
Extended
Mode Register
Drive Strength
An - A3
A2 - A0
Operating Mode
0
Valid
Normal Operation
-
-
All other states
Reserved
A1
Drive Strength
0
Normal
1
Weak
A2
0
must be set to 0
* BA0 and BA1 must be 1, 0 to select the Extended Mode Register
(vs. the base Mode Register)
2003-01-10, V0.9
A0
DLL
0
Enable
1
Disable
Page 13 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Commands
CommandsDeselect
The Deselect function prevents new commands from being executed by the DDR SDRAM. The DDR SDRAM
is effectively deselected. Operations already in progress are not affected.
No Operation (NOP)
The No Operation (NOP) command is used to perform a NOP to a DDR SDRAM. This prevents unwanted
commands from being registered during idle or wait states. Operations already in progress are not affected.
Mode Register Set
The mode registers are loaded via inputs A0-A12, BA0 and BA1. See mode register descriptions in the Register Definition section. The Mode Register Set command can only be issued when all banks are idle and no
bursts are in progress. A subsequent executable command cannot be issued until tMRD is met.
Active
The Active command is used to open (or activate) a row in a particular bank for a subsequent access. The
value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-A12 selects the row.
This row remains active (or open) for accesses until a Precharge (or Read or Write with Auto Precharge) is
issued to that bank. A Precharge (or Read or Write with Auto Precharge) command must be issued and completed before opening a different row in the same bank.
Read
The Read command is used to initiate a burst read access to an active (open) row. The value on the BA0,
BA1 inputs selects the bank, and the address provided on inputs A0-Ai, Aj (where [i = 8, j = don’t care] for
x16, [i = 9, j = don’t care] for x8 and [i = 9, j = 11] for x4) selects the starting column location. The value on
input A10 determines whether or not Auto Precharge is used. If Auto Precharge is selected, the row being
accessed is precharged at the end of the Read burst; if Auto Precharge is not selected, the row remains open
for subsequent accesses.
Write
The Write command is used to initiate a burst write access to an active (open) row. The value on the BA0,
BA1 inputs selects the bank, and the address provided on inputs A0-Ai, Aj (where [i = 9, j = don’t care] for x8;
where [i = 9, j = 11] for x4) selects the starting column location. The value on input A10 determines whether or
not Auto Precharge is used. If Auto Precharge is selected, the row being accessed is precharged at the end
of the Write burst; if Auto Precharge is not selected, the row remains open for subsequent accesses. Input
data appearing on the DQs is written to the memory array subject to the DM input logic level appearing coincident with the data. If a given DM signal is registered low, the corresponding data is written to memory; if the
DM signal is registered high, the corresponding data inputs are ignored, and a Write is not executed to that
byte/column location.
Precharge
The Precharge command is used to deactivate (close) the open row in a particular bank or the open row(s) in
all banks. The bank(s) will be available for a subsequent row access a specified time (tRP) after the Precharge
command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case
where only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated
as “Don’t Care.” Once a bank has been precharged, it is in the idle state and must be activated prior to any
Page 14 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Read or Write commands being issued to that bank. A precharge command is treated as a NOP if there is no
open row in that bank, or if the previously open row is already in the process of precharging.
Auto Precharge
Auto Precharge is a feature which performs the same individual-bank precharge functions described above,
but without requiring an explicit command. This is accomplished by using A10 to enable Auto Precharge in
conjunction with a specific Read or Write command. A precharge of the bank/row that is addressed with the
Read or Write command is automatically performed upon completion of the Read or Write burst. Auto Precharge is nonpersistent in that it is either enabled or disabled for each individual Read or Write command.
Auto Precharge ensures that the precharge is initiated at the earliest valid stage within a burst. The user must
not issue another command to the same bank until the precharge (tRP) is completed. This is determined as if
an explicit Precharge command was issued at the earliest possible time, as described for each burst type in
the Operation section of this data sheet.
Burst Terminate
The Burst Terminate command is used to truncate read bursts (with Auto Precharge disabled). The most recently registered Read command prior to the Burst Terminate command is truncated, as shown in the Operation section of this data sheet.
Auto Refresh
Auto Refresh is used during normal operation of the DDR SDRAM and is analogous to CAS Before RAS
(CBR) Refresh in previous DRAM types. This command is nonpersistent, so it must be issued each time a
refresh is required.
The refresh addressing is generated by the internal refresh controller. This makes the address bits “Don’t
Care” during an Auto Refresh command. The 256Mb DDR SDRAM requires Auto Refresh cycles at an average periodic interval of 7.8 ms (maximum).
To allow for improved efficiency in scheduling and switching between tasks, some flexibility in the absolute
refresh interval is provided. A maximum of eight Auto Refresh commands can be posted in the system,
meaning that the maximum absolute interval between any Auto Refresh command and the next Auto Refresh
command is 9 * 7.8 ms (70.2ms). This maximum absolute interval is short enough to allow for DLL updates
internal to the DDR SDRAM to be restricted to Auto Refresh cycles, without allowing too much drift in tAC
between updates.
Self Refresh
The Self Refresh command can be used to retain data in the DDR SDRAM, even if the rest of the system is
powered down. When in the self refresh mode, the DDR SDRAM retains data without external clocking. The
Self Refresh command is initiated as an Auto Refresh command coincident with CKE transitioning low. The
DLL is automatically disabled upon entering Self Refresh, and is automatically enabled upon exiting Self
Refresh (200 clock cycles must then occur before a Read command can be issued). Input signals except
CKE (low) are “Don’t Care” during Self Refresh operation.
The procedure for exiting self refresh requires a sequence of commands. CK (and CK) must be stable prior to
CKE returning high. Once CKE is high, the SDRAM must have NOP commands issued for tXSNR because
time is required for the completion of any internal refresh in progress. A simple algorithm for meeting both
refresh and DLL requirements is to apply NOPs for 200 clock cycles before applying any other command.
2003-01-10, V0.9
Page 15 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Truth Table 1a: Commands
Name (Function)
CS
RAS
CAS
WE
Address
MNE
Notes
Deselect (Nop)
H
X
X
X
X
NOP
1, 9
No Operation (Nop)
L
H
H
H
X
NOP
1, 9
Active (Select Bank And Activate Row)
L
L
H
H
Bank/Row
ACT
1, 3
Read (Select Bank And Column, And Start Read Burst)
L
H
L
H
Bank/Col
Read
1, 4
Write (Select Bank And Column, And Start Write Burst)
L
H
L
L
Bank/Col
Write
1, 4
Burst Terminate
L
H
H
L
X
BST
1, 8
Precharge (Deactivate Row In Bank Or Banks)
L
L
H
L
Code
PRE
1, 5
Auto Refresh Or Self Refresh (Enter Self Refresh Mode)
L
L
L
H
X
AR / SR
1, 6, 7
Mode Register Set
L
L
L
L
Op-Code
MRS
1, 2
1. CKE is HIGH for all commands shown except Self Refresh.
2. BA0, BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register; BA0 = 1, BA1 = 0
selects Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-A12 provide the op-code to be written to the
selected Mode Register.)
3. BA0-BA1 provide bank address and A0-A12 provide row address.
4. BA0, BA1 provide bank address; A0-Ai provide column address (where i = 8for x16, i = 9 for x8 and 9, 11 for x4); A10 HIGH
enables the Auto Precharge feature (nonpersistent), A10 LOW disables the Auto Precharge feature.
5. A10 LOW: BA0, BA1 determine which bank is precharged.
A10 HIGH: all banks are precharged and BA0, BA1 are “Don’t Care.”
6. This command is AUTO REFRESH if CKE is HIGH; Self Refresh if CKE is LOW.
7. Internal refresh counter controls row and bank addressing; all inputs and I/Os are “Don’t Care” except for CKE.
8. Applies only to read bursts with Auto Precharge disabled; this command is undefined (and should not be used) for read bursts with
Auto Precharge enabled or for write bursts
9. Deselect and NOP are functionally interchangeable.
Truth Table 1b: DM Operation
Name (Function)
DM
DQs
Notes
Write Enable
L
Valid
1
Write Inhibit
H
X
1
1. Used to mask write data; provided coincident with the corresponding data.
Page 16 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Truth Table 2: Clock Enable (CKE)
1.
2.
3.
4.
CKEn is the logic state of CKE at clock edge n: CKE n-1 was the state of CKE at the previous clock edge.
Current state is the state of the DDR SDRAM immediately prior to clock edge n.
COMMAND n is the command registered at clock edge n, and ACTION n is a result of COMMAND n.
All states and sequences not shown are illegal or reserved.
CKE n-1
CKEn
Current State
Previous
Cycle
Current
Cycle
Command n
Self Refresh
L
L
X
Self Refresh
L
H
Deselect or NOP
Power Down
L
L
X
Power Down
L
H
Deselect or NOP
Exit Power-Down
All Banks Idle
H
L
Deselect or NOP
Precharge Power-Down Entry
All Banks Idle
H
L
AUTO REFRESH
Self Refresh Entry
Bank(s) Active
H
L
Deselect or NOP
Active Power-Down Entry
H
H
See “Truth Table 3: Current State
Bank n - Command to Bank n
(Same Bank)” on page 18
Action n
Notes
Maintain Self-Refresh
Exit Self-Refresh
1
Maintain Power-Down
1. Deselect or NOP commands should be issued on any clock edges occurring during the Self Refresh Exit (tXSNR) period. A minimum of 200 clock cycles are needed before applying a read command to allow the DLL to lock to the input clock.
2003-01-10, V0.9
Page 17 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Truth Table 3: Current State Bank n - Command to Bank n (Same Bank)
Current State
Any
Idle
Row Active
Read
(Auto Precharge
Disabled)
Write
(Auto Precharge
Disabled)
CS
RAS
CAS
WE
Command
H
X
X
X
Deselect
NOP. Continue previous operation
Action
Notes
1-6
L
H
H
H
No Operation
NOP. Continue previous operation
1-6
L
L
H
H
Active
Select and activate row
1-6
L
L
L
H
AUTO REFRESH
L
L
L
L
MODE REGISTER SET
L
H
L
H
Read
Select column and start Read burst
1-6, 10
L
H
L
L
Write
Select column and start Write burst
1-6, 10
1-7
1-7
L
L
H
L
Precharge
L
H
L
H
Read
Deactivate row in bank(s)
1-6, 8
Select column and start new Read burst
L
L
H
L
Precharge
1-6, 10
Truncate Read burst, start Precharge
L
H
H
L
BURST TERMINATE
1-6, 8
BURST TERMINATE
1-6, 9
L
H
L
H
Read
Select column and start Read burst
1-6, 10, 11
L
H
L
L
Write
Select column and start Write burst
1-6, 10
L
L
H
L
Precharge
Truncate Write burst, start Precharge
1-6, 8, 11
1. This table applies when CKE n-1 was HIGH and CKE n is HIGH (see Truth Table 2: Clock Enable (CKE) and after tXSNR / tXSRD
has been met (if the previous state was self refresh).
2. This table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are those
allowed to be issued to that bank when in that state. Exceptions are covered in the notes below.
3. Current state definitions:
Idle:
The bank has been precharged, and tRP has been met.
Row Active:
A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register
accesses are in progress.
Read:
A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
Write:
A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
4. The following states must not be interrupted by a command issued to the same bank.
Precharging:
Starts with registration of a Precharge command and ends when tRP is met. Once tRP is met, the bank is in the
idle state.
Row Activating: Starts with registration of an Active command and ends when tRCD is met. Once tRCD is met, the bank is in the
“row active” state.
Read w/Auto Precharge Enabled: Starts with registration of a Read command with Auto Precharge enabled and ends when tRP
has been met. Once tRP is met, the bank is in the idle state.
Write w/Auto Precharge Enabled: Starts with registration of a Write command with Auto Precharge enabled and ends when tRP
has been met. Once tRP is met, the bank is in the idle state.
Deselect or NOP commands, or allowable commands to the other bank should be issued on any clock edge occurring during these
states. Allowable commands to the other bank are determined by its current state and according Truth Table 4.
5. The following states must not be interrupted by any executable command; Deselect or NOP commands must be applied on each
positive clock edge during these states.
Refreshing:
Starts with registration of an Auto Refresh command and ends when tRFC is met. Once tRFC is met, the DDR
SDRAM is in the “all banks idle” state.
Accessing Mode Register: Starts with registration of a Mode Register Set command and ends when tMRD has been met. Once
tMRD is met, the DDR SDRAM is in the “all banks idle” state.
Precharging All: Starts with registration of a Precharge All command and ends when tRP is met. Once tRP is met, all banks is in
the idle state.
6. All states and sequences not shown are illegal or reserved.
7. Not bank-specific; requires that all banks are idle.
8. May or may not be bank-specific; if all/any banks are to be precharged, all/any must be in a valid state for precharging.
9. Not bank-specific; BURST TERMINATE affects the most recent Read burst, regardless of bank.
10. Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads or Writes
with Auto Precharge disabled.
11. Requires appropriate DM masking.
Page 18 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Truth Table 4: Current State Bank n - Command to Bank m (Different bank)
Current State
Any
Idle
Row Activating,
Active, or
Precharging
Read
(Auto Precharge
Disabled)
Write
(Auto Precharge
Disabled)
Read (With
Auto Precharge)
Write (With
Auto Precharge)
CS
RAS
CAS
WE
Command
H
X
X
X
Deselect
NOP/continue previous operation
Action
Notes
1-6
L
H
H
H
No Operation
NOP/continue previous operation
1-6
X
X
X
X
Any Command Otherwise
Allowed to Bank m
L
L
H
H
Active
Select and activate row
1-6
1-6
L
H
L
H
Read
Select column and start Read burst
1-7
L
H
L
L
Write
Select column and start Write burst
1-7
L
L
H
L
Precharge
L
L
H
H
Active
Select and activate row
1-6
L
H
L
H
Read
Select column and start new Read burst
1-7
L
L
H
L
Precharge
L
L
H
H
Active
Select and activate row
1-6
L
H
L
H
Read
Select column and start Read burst
1-8
L
H
L
L
Write
Select column and start new Write burst
1-7
L
L
H
L
Precharge
L
L
H
H
Active
Select and activate row
L
H
L
H
Read
Select column and start new Read burst
L
H
L
L
Write
Select column and start Write burst
L
L
H
L
Precharge
L
L
H
H
Active
Select and activate row
L
H
L
H
Read
Select column and start Read burst
1-7,10
L
H
L
L
Write
Select column and start new Write burst
1-7,10
L
L
H
L
Precharge
1-6
1-6
1-6
1-6
1-7,10
1-7,9,10
1-6
1-6
1-6
1. This table applies when CKE n-1 was HIGH and CKE n is HIGH (see Truth Table 2: Clock Enable (CKE) and after tXSNR / tXSRD
has been met (if the previous state was self refresh).
2. This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands shown
are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is allowable). Exceptions are covered in the notes below.
3. Current state definitions:
Idle:
The bank has been precharged, and tRP has been met.
Row Active:
A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register
accesses are in progress.
Read:
A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
Write:
A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
Read with Auto Precharge Enabled: See note 10.
Write with Auto Precharge Enabled: See note 10.
4. AUTO REFRESH and Mode Register Set commands may only be issued when all banks are idle.
5. A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current state only.
6. All states and sequences not shown are illegal or reserved.
7. Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads or Writes
with Auto Precharge disabled.
8. Requires appropriate DM masking.
9. A Write command may be applied after the completion of data output.
10. Concurrent Auto Precharge:
This device supports “Concurrent Auto Precharge”. When a read with auto precharge or a write with auto precharge is enabled any
command may follow to the other banks as long as that command does not interrupt the read or write data transfer and all other
limitations apply (e.g. contention between READ data and WRITE data must be avoided). The mimimum delay from a read or write
command with auto precharge enable, to a command to a different banks is summarized in table 5.
2003-01-10, V0.9
Page 19 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Truth Table 5: Concurrent Auto Precharge
From Command
WRITE w/AP
Minimum Delay with Concurrent Auto Precharge
Support
Units
Read or Read w/AP
1 + (BL/2) + tWTR
tCK
Write ot Write w/AP
BL/2
tCK
1
tCK
Read or Read w/AP
BL/2
tCK
Write or Write w/AP
CL (rounded up)+ BL/2
tCK
1
tCK
To Command
(different bank)
Precharge or Activate
Read w/AP
Precharge or Activate
Page 20 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Simplified State Diagram
Power
Applied
Power
On
Self
Refresh
Precharge
PREALL
REFS
REFSX
MRS
EMRS
MRS
Auto
Refresh
REFA
Idle
CKEL
CKEH
Active
Power
Down
ACT
Precharge
Power
Down
CKEH
CKEL
Burst Stop
Row
Active
Write
Write A
Write
Read
Read A
Read
Read
Read A
Write A
Read
A
PRE
Write
A
PRE
PRE
PRE
Read
A
Precharge
PREALL
Automatic Sequence
Command Sequence
PREALL = Precharge All Banks
MRS = Mode Register Set
EMRS = Extended Mode Register Set
REFS = Enter Self Refresh
REFSX = Exit Self Refresh
REFA = Auto Refresh
2003-01-10, V0.9
CKEL = Enter Power Down
CKEH = Exit Power Down
ACT = Active
Write A = Write with Autoprecharge
Read A = Read with Autoprecharge
PRE = Precharge
Page 21 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Operating Conditions
Absolute Maximum Ratings
Symbol
VIN, VOUT
VIN
VDD
VDDQ
TA
TSTG
PD
IOUT
Parameter
Rating
Units
-0.5 to VDDQ+ 0.5
V
Voltage on Inputs relative to VSS
-0.5 to +3.6
V
Voltage on VDD supply relative to VSS
-0.5 to +3.6
V
Voltage on VDDQ supply relative to VSS
-0.5 to +3.6
V
0 to +70
°C
-55 to +150
°C
Power Dissipation
1.0
W
Short Circuit Output Current
50
mA
Voltage on I/O pins relative to VSS
Operating Temperature (Ambient)
Storage Temperature (Plastic)
Note: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a
stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Input and Output Capacitances
Parameter
Package
Symbol
Min.
Max.
Units
Notes
Input Capacitance: CK, CK
TSOP
CI1
2.0
3.0
pF
1
Delta Input Capacitance CK, CK
TSOP
CdI1
-
0.25
pF
1
Input Capacitance: All other input-only pins
TSOP
CI2
2.0
3.0
pF
1
Delta Input Capacitance: All other input-only pins
TSOP
CdI2
-
0.5
pF
1
Input/Output Capacitance: DQ, DQS, DM
TSOP
CIO
4.0
5.0
pF
1, 2
Delta Input/Output Capacitance : DQ, DQS, DM
TSOP
CdIO
-
0.5
pF
1
1. These values are guaranteed by design and are tested on a sample base only. VDDQ = V DD = 2.6V ± 0.1V, f = 100MHz, TA = 25°C,
VOUT (DC) = VDDQ/2, VOUT (Peak to Peak) 0.2V. Unused pins are tied to ground .
2. DM inputs are grouped with I/O pins reflecting the fact that they are matched in loading to DQ and DQS to facilitate trace matching
at the board level
Page 22 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Electrical Characteristics and DC Operating Conditions
(0°C £ TA £ 70°C; VDDQ = 2.6V ± 0.1V, VDD = + 2.6V ± 0.1V )
Symbol
Min
Max
Supply Voltage
2.50
2.70
V
1, 2
I/O Supply Voltage
2.50
2.70
V
1, 2
VSS, VSSQ Supply Voltage, I/O Supply Voltage
0
0
V
I/O Reference Voltage
VDDQ /2-50mV
VDDQ /2+50mV
V
2, 3
I/O Termination Voltage (System)
VREF - 0.04
VREF + 0.04
V
2, 4
VIH(DC)
Input High (Logic1) Voltage
VREF + 0.15
VDDQ + 0.3
V
2
VIL(DC)
Input Low (Logic0) Voltage
- 0.3
VREF - 0.15
V
2
VIN(DC)
Input Voltage Level, CK and CK Inputs
- 0.3
VDDQ + 0.3
V
2
VID(DC)
Input Differential Voltage, CK and CK Inputs
0.36
VDDQ + 0.6
V
2, 5
VIRatio
VI-Matching Pullup Current to Pulldown Current
0.71
1.4
Input Leakage Current. Any input 0V £ VIN £ VDD
(All other pins not under test = 0V)
-2
2
mA
2
IOZ
Output Leakage Current
(DQs are disabled; 0V £ Vout £ VDDQ
-5
5
mA
2
IOH
Output High Current, Normal Strength Driver (VOUT = 1.95 V)
- 16.2
mA
IOL
Output Low Current, Normal Strength Driver (VOUT = 0.35 V)
16.2
mA
VDD
VDDQ
VREF
VTT
II
Parameter
Units Notes
6
1. This is the DC voltage supplied at the DRAM and is inclusive all noise up to 10MHz. The DRAM does not generate any noise that
exceeds ±150mV above 10MHz and does meet full functionality with up to ±150mV above 10MHz at the DRAM that is generated
by the DRAM itself. Any noise above 10MHz at the DRAM generated from any other source than the DRAM itself may not exceed
the DC voltage range of 2.6V ±100mV. The AC and DC tolerances of the data sheet are additive.
2. Inputs are not recognized as valid until VREF stabilizes.
3. VREF is expected to be equal to 0.5 VDDQ of the transmitting device, and to track variations in the DC level of the
same. Peak-to-peak noise on VREF may not exceed ± 2% of the DC value.
4. VTT is not applied directly to the device. VTT is a system supply for signal termination resistors, is expected to be set
equal to VREF, and must track variations in the DC level of VREF.
5. VID is the magnitude of the difference between the input level on CK and the input level on CK
6. The ration of the pullup current to the pulldown current is specified for the same temperature and voltage, over the
entire temperature and voltage range, for device drain to source voltage from 0.25 to 1.0V. For a given output, it represents the maximum difference between pullup and pulldown drivers due to process variation.
2003-01-10, V0.9
Page 23 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
IDD Specification and Conditions
(0 °C £ TA £ 70 °C; VDDQ = 2.5V ± 0.2V; VDD = 2.5V ± 0.2V)
DDR200
-8
Symbol Parameter/Condition
DDR266A
-7
DDR266
-7F
DDR333
-6
DDR400A/B
-5
Notes
Unit
typ. max.
typ.
max.
typ.
max. typ. max.
typ.
max.
OperatingCurrent: onebank; active/ precharge; tRC=tRCMIN; x4/x8
IDD0 DQ, DM, andDQSinputs changingonceper clock cycle; address
andcontrol inputs changingonceevery twoclock cycles
x16
70
90
75
100
83
110
85
110
90
115
mA
72
95
77
105
86
115
88
115
100
120
mA
x4/x8
80
100
90
110
98
120
100
120
105
125
mA
x16
83
105
94
115
102
125
104
125
115
135
mA
PrechargePower-DownStandbyCurrent: all banks idle; power-downmode;
CKE<= VILMAX
5
7
6
8
6
8
6
9
6
9
mA
1, 2
PrechargeFloatingStandbyCurrent: /CS>= VIHMIN, all banks idle;
IDD2F CKE>= VIHMIN; address andother control inputs changingonceper clock cycle, VIN
= VREFfor DQ, DQSandDM.
30
35
35
40
35
40
45
55
46
56
mA
1, 2
PrechargeQuiet StandbyCurrent: /CS>=VIHMIN, all banks idle;
IDD2Q CKE>= VIHMIN; address andother control inputs stable
at >=VIHMINor <= VILMAX; VIN=VREFfor DQ, DQSandDM.
18
22
20
25
20
25
25
28
24
34
mA
1, 2
13
16
15
18
15
18
18
21
17
24
mA
1, 2
40
45
50
55
50
55
60
65
57
69
mA
42
50
52
60
52
60
63
70
60
74
mA
79
95
95
115
95
115
110
140
115
145
mA
89
110
107
130
107
130
124
160
140
175
mA
85
105
105
125
105
125
125
145
125
150
mA
96
120
119
140
119
140
141
165
150
180
mA
126
170
135
180
135
180
144
190
155
195
mA
1.5
2.5
1.5
2.5
1.5
2.5
1.5
2.5
1.6
2.6
mA
lowpower version 1.20 1.25 1.20 1.25 1.20 1.25 1.20 1.25
1.25
1.30
mA
x4/x8
150
210
171
225
171
225
208
270
240
280
x16
158
220
180
235
180
235
218
285
260
310
OperatingCurrent: onebank; active/read/precharge;
IDD1 burst length4;
Refer tothefollowingpagefor detailedtest conditions.
IDD2P
IDD3P
4
1, 2
1, 2
ActivePower-DownStandbyCurrent: onebank active; power-downmode;
CKE<= VILMAX; VIN=VREFfor DQ, DQSandDM.
ActiveStandbyCurrent: onebank active; CS>=VIHMIN;
x4/x8
CKE>= VIHMIN; tRC=tRASMAX; DQ, DM, andDQSinputs
IDD3N
changingtwiceper clock cycle; address andcontrol inputs changing
x16
onceper clock cycle
OperatingCurrent: onebank active; BL2; reads; continuous burst;
x4/x8
address andcontrol inputs changingonceper clock cycle; 50%of
IDD4R
dataoutputs changingonevery clock edge; CL2for DDR200and
x16
DDR266(A), CL3for DDR333andDDR400; IOUT=0mA
OperatingCurrent: onebank active; Burst =2; writes; continuous
x4/x8
burst; address andcontrol inputs changingonceper clock cycle;
IDD4W
50%of dataoutputs changingonevery clock edge; CL2for
x16
DDR200andDDR266(A), CL3for DDR333andDDR400
IDD5 Auto-RefreshCurrent: tRC=tRFCMIN, distributedrefresh
standardversion
1, 2
1, 2
1, 2
IDD6 Self-RefreshCurrent: CKE<=0.2V; external clock on
OperatingCurrent: four bank; four bank interleavingwithburst
IDD7 length4;
Refer tothefollowingpagefor detailedtest conditions.
1, 2
1, 2, 3
mA
1, 2
1. IDDspecifications aretestedafter thedeviceis properly initializedandmeasured
at 100MHz for DDR200, 133MHz for DDR266(A) and166MHz for DDR333
2. Input slewrate=1V/ns.
3. Enables on-chiprefreshandaddress counters
4. Test conditionfor typical values : VDD= 2.5V,Ta=25°C, test conditionfor maximumvalues: test limit at VDD= 2.7V,Ta=10°C
Page 24 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Detailed test conditions for DDR SDRAM IDD1 and IDD7
IDD1 : Operating current : One bank operation
1. Only one bank is accessed with tRC(min) , Burst Mode, Address and Control inputs on NOP edge are changing once
per clock cycle. lout = 0 mA
2. Timing patterns
- DDR200 (100Mhz, CL=2) : tCK = 10 ns, CL=2, BL=4, tRCD = 2 * tCK, tRAS = 5 * tCK
Setup: A0 N R0 N N P0 N
Read : A0 N R0 N N P0 N - repeat the same timing with random address changing
50% of data changing at every burst
- DDR266A (133Mhz, CL=2) : tCK = 7.5 ns, CL=2, BL=4, tRCD = 3 * tCK, tRC = 9 * tCK, tRAS = 5 * tCK
Setup: A0 N N R0 N P0 N N N
Read : A0 N N R0 N P0 N NN - repeat the same timing with random address changing
50% of data changing at every burst
- DDR333 (166Mhz, CL=2.5) : tCK = 6 ns, CL=2.5, BL=4, tRCD = 3 * tCK, tRC = 9 * tCK, tRAS = 5 * tCK
Setup: A0 N N R0 N P0 N N N
Read : A0 N N R0 N P0 N N N - repeat the same timing with random address changing
50% of data changing at every burst
3.Legend : A=Activate, R=Read, W=Write, P=Precharge, N=NOP
IDD7 : Operating current: Four bank operation
1. Four banks are being interleaved with tRC(min) , Burst Mode, Address and Control inputs on NOP edge are not
changing. lout = 0 mA
2. Timing patterns
- DDR200 (100Mhz, CL=2) : tCK = 10 ns, CL=2, BL=4, tRRD = 2 * tCK, tRCD= 3 * tCK, Read with autoprecharge
Setup: A0 N A1 R0 A2 R1 A3 R2
Read : A0 R3 A1 R0 A2 R1 A3 R2- repeat the same timing with random address changing
50% of data changing at every burst
- DDR266A (133Mhz, CL=2) : tCK = 7.5 ns, CL=2, BL=4, tRRD = 2 * tCK, tRCD = 3 * tCK
Setup: A0 N A1 R0 A2 R1 A3 R2 N R3
Read : A0 N A1 R0 A2 R1 A3 R2 N R3 - repeat the same timing with random address changing
50% of data changing at every burst
- DDR333 (166Mhz, CL=2.5) : tCK = 6 ns, CL=2.5, BL=4, tRRD = 2 * tCK, tRCD = 3 * tCK
Setup: A0 N A1 R0 A2 R1 A3 R2 N R3
Read : A0 N A1 R0 A2 R1 A3 R2 N R3 - repeat the same timing with random address changing
50% of data changing at every burst
3.Legend : A=Activate, R=Read, W=Write, P=Precharge, N=NOP
2003-01-10, V0.9
Page 25 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
AC Characteristics
(Notes 1-6 apply to the following Tables: Electrical Characteristics and DC Operating Conditions, AC Operating
Conditions, IDD Specifications and Conditions, and Electrical Characteristics and AC Timing.)
1. All voltages referenced to VSS.
2. Tests for AC timing, IDD, and electrical, AC and DC characteristics, may be conducted at nominal reference/supply
voltage levels, but the related specifications and device operation are guaranteed for the full voltage range specified.
3. The figure below represents the timing reference load used in defining the relevant timing parameters of the part. It is
not intended to be either a precise representation of the typical system environment nor a depiction of the actual load
presented by a production tester. System designers will use IBIS or other simulation tools to correlate the timing reference load to a system environment. Manufacturers will correlate to their production test conditions (generally a
coaxial transmission line terminated at the tester electronics).
4. AC timing and IDD tests may use a VIL to VIH swing of up to 1.5V in the test environment, but input timing is still referenced to VREF (or to the crossing point for CK, CK), and parameter specifications are guaranteed for the specified AC
input levels under normal use conditions. The minimum slew rate for the input signals is 1V/ns in the range between
VIL(AC) and VIH(AC).
5. The AC and DC input level specifications are as defined in the SSTL_2 Standard (i.e. the receiver effectively
switches as a result of the signal crossing the AC input level, and remains in that state as long as the signal does not
ring back above (below) the DC input LOW (HIGH) level)
6. For System Characteristics like Setup & Holdtime Derating for Slew Rate, I/O Delta Rise/Fall Derating,DDR SDRAM
Slew Rate Standards, Overshoot & Undershoot specification and Clamp V-I characteristics see the latest JEDEC
specification for DDR components
AC Output Load Circuit Diagram / Timing Reference Load
VTT
50W
Output
Timing Reference Point
(VOUT)
30pF
AC Operating Conditions )
(0 °C £ TA £ 70 °C; VDDQ = 2.6V ± 0.1V; VDD = 2.6V ± 0.1V)
Symbol
Parameter/Condition
VIH(AC)
Input High (Logic 1) Voltage, DQ, DQS, and DM Signals
VIL(AC)
Input Low (Logic 0) Voltage, DQ, DQS, and DM Signals
VID(AC)
Input Differential Voltage, CK and CK Inputs
VIX(AC)
Input Closing Point Voltage, CK and CK Inputs
1.
2.
3.
4.
Min
Max
Unit
Notes
V
1, 2
VREF - 0.31
V
1, 2
VDDQ + 0.6
V
1, 2, 3
V
1, 2, 4
VREF + 0.31
0.7
0.5*VDDQ - 0.2 0.5*VDDQ + 0.2
Input slew rate = 1V/ns.
Inputs are not recognized as valid until VREF stabilizes.
VID is the magnitude of the difference between the input level on CK and the input level on CK.
The value of VIX is expected to equal 0.5*VDDQ of the transmitting device and must track variations in the DC level of the same.
Page 26 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Electrical Characteristics & AC Timing - Absolute Specifications
(0 °C £ TA £ 70 °C; VDDQ = 2.6V ± 0.1V; VDD = 2.6V ± 0.1V) (Part 1 of 2)
Symbol
tAC
DDR400A
-5A
Parameter
DQ output access time from CK/CK
tDQSCK DQS output access time from CK/CK
DDR400B
-5
Unit
Notes
+0.5
ns
1-4
-0.55
+0.55
ns
1-4
Min.
Max.
Min.
Max.
-0.5
+0.5
-0.5
-0.55
+0.55
tCH
CK high-level width
0.45
0.55
0.45
0.55
tCK
1-4
tCL
CK low-level width
0.45
0.55
0.45
0.55
tCK
1-4
tHP
Clock Half Period
min (tCL, tCH)
ns
1-4
tCK
tCK
Clock cycle time
tCK
min (tCL, tCH)
CL = 3.0
5
10
5
10
ns
1-4
CL = 2.5
5
10
6
10
ns
1-4
CL = 2.0
7.5
10
7.5
10
ns
1-4
tDH
DQ and DM input hold time
0.40
0.40
ns
1-4
tDS
DQ and DM input setup time
0.40
0.40
ns
1-4
tIPW
Control & Addr. input pulse width (each input)
2.2
2.2
ns
1-4,10
tDIPW
DQ and DM input pulse width (each input)
1.75
1.75
ns
1-4, 10
tHZ
Data-out high-impedence time from CK/CK
+0.65
ns
1-4, 5
tLZ
Data-out low-impedence time from CK/CK
-0.65
+0.65
-0.65
+0.65
ns
1-4, 5
tDQSS
Write command to 1st DQS latching
transition
0.72
1.28
0.72
1.28
tCK
1-4
tDQSQ
DQS-DQ skew
(DQS & associated DQ signals)
+0.4
+0.4
ns
1-4
tQHS
Data hold skew factor
+0.5
+0.5
ns
1-4
tQH
DQ output hold time from DQS
tDQSL,H DQS input low (high) pulse width (write cycle)
+0.65
tHP-tQHS
tHP-tQHS
ns
1-4
0.35
0.35
tCK
1-4
tDSS
DQS falling edge to CK setup time (write cycle)
0.2
0.2
tCK
1-4
tDSH
DQS falling edge hold time from CK (write cycle)
0.2
0.2
tCK
1-4
tMRD
Mode register set command cycle time
2
2
tCK
1-4
0
0
ns
1-4, 7
tCK
1-4, 6
1-4
tWPRES Write preamble setup time
tWPST
Write postamble
0.40
tWPRE
Write preamble
0.25
0.25
tCK
0.6
0.6
ns
tIS
Address and control input setup
time
fast slew rate
tIH
Address and control input hold
time
fast slew rate
0.60
0.40
0.60
2-4,
10,11
0.6
0.6
ns
tRPRE
Read preamble
0.9
1.1
0.9
1.1
tCK
1-4
tRPST
Read postamble
0.40
0.60
0.40
0.60
tCK
1-4
tRAS
Active to Precharge command
40
70,000
40
70,000
ns
1-4
tRC
Active to Active/Auto-refresh command period
55
55
ns
1-4
tRFC
Auto-refresh to Active/Auto-refresh command
period
65
65
ns
1-4
2003-01-10, V0.9
Page 27 of 29
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Electrical Characteristics & AC Timing - Absolute Specifications
(0 °C £ TA £ 70 °C; VDDQ = 2.6V ± 0.1V; VDD = 2.6V ± 0.1V) (Part 2 of 2)
Symbol
Parameter
DDR400A
-5A
Min.
tRCD
Max.
DDR400B
-5
Min.
Unit
Notes
Max.
Active to Read or Write delay
15
15
ns
1-4
tRP
Precharge command period
15
15
ns
1-4
tRAP
Active to Autoprecharge delay
15
15
ns
1-4
tRRD
Active bank A to Active bank B command
10
10
ns
1-4
tWR
Write recovery time
15
15
ns
1-4
tDAL
Auto precharge write recovery
+ precharge time
tCK
1-4,9
tWTR
Internal write to read command delay
1
1
tCK
1-4
tXSNR
Exit self-refresh to non-read command
75
75
ns
1-4
tXSRD
Exit self-refresh to read command
200
200
tCK
1-4
tREFI
Average Periodic Refresh Interval (8192 refresh
commands per 64ms refresh period)
ms
1-4, 8
7.8
7.8
1. Input slew rate >= 1V/ns for DDR400
2. The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross: the
input reference level for signals other than CK/CK, is VREF. CK/CK slew rate are >= 1.0 V/ns
3. Inputs are not recognized as valid until VREF stabilizes.
4. The Output timing reference level, as measured at the timing reference point indicated in AC Characteristics
(Note 3) is VTT.
5. tHZ and tLZ transitions occur in the same access time windows as valid data transitions. These parameters are
not referred to a specific voltage level, but specify when the device is no longer driving (HZ), or begins driving
(LZ).
6. The maximum limit for this parameter is not a device limit. The device operates with a greater value for this
parameter, but system performance (bus turnaround) degrades accordingly.
7. The specific requirement is that DQS be valid (HIGH, LOW, or some point on a valid transition) on or before this
CK edge. A valid transition is defined as monotonic and meeting the input slew rate specifications of the device.
When no writes were previously in progress on the bus, DQS will be transitioning from Hi-Z to logic LOW. If a
previous write was in progress, DQS could be HIGH, LOW, or transitioning from HIGH to LOW at this time,
depending on tDQSS.
8. A maximum of eight Autorefresh commands can be posted to any given DDR SDRAM device.
9. For each of the terms, if not already an integer, round to the next highest integer. tCK is equal to the actual system clock cycle time.
10. These parameters guarantee device timing, but they are not necessarilty tested on each device
11. Fast slew rate >= 1.0 V/ns , slow slew rate >= 0.5 V/ns and < 1V/ns for command/address and CK & CK slew
rate >1.0 V/ns, measured between VOH(ac) and VOL(ac)
Page 28 of 29
2003-01-10, V0.9
HYB25D256[800/160]BT(L)-[5/5A]
256MBit Double Data Rata SDRAM
Preliminary DDR400 Data Sheet Addendum
Electrical Characteristics & AC Timing for DDR400 - Applicable Specifications
Expressed in Clock Cycles (0 °C £ TA £ 70 °C; VDDQ = 2.6V ± 0.1V; VDD = 2.6V ± 0.1V,
DDR400A/B
Symbol
Parameter
Units
Notes
2
tCK
1-54
0.25
tCK
1-5
tCK
1-5
Min
tMRD
tWPRE
Mode register set command cycle time
Write preamble
Max
tRAS
Active to Precharge command
8
tRC
Active to Active/Auto-refresh command period
11
tCK
1-5
tRFC
Auto-refresh to Active/Auto-refresh
command period
13
tCK
1-5
tRCD
Active to Read or Write delay
3
tCK
1-5
Precharge command period
3
tCK
1-5
tRRD
Active bank A to Active bank B command
2
tCK
1-5
tWR
Write recovery time
3
tCK
1-5
tDAL
Auto precharge write recovery + precharge time
5
tCK
1-5
tWTR
Internal write to read command delay
1
tCK
1-5
tXSNR
Exit self-refresh to non-read command
10
tCK
1-5
tXSRD
Exit self-refresh to read command
200
tCK
1-5
tRP
16000
1. Input slew rate = 1V/ns
2. The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross: the input reference level for
signals other than CK/CK, is VREF.
3. Inputs are not recognized as valid until VREF stabilizes.
4. The Output timing reference level, as measured at the timing reference point indicated in AC Characteristics (Note 3) is VTT.
5. tHZ and tLZ transitions occur in the same access time windows as valid data transitions. These parameters are not referred to a specific voltage level, but specify when the device is no longer driving (HZ), or begins driving (LZ).
2003-01-10, V0.9
Page 29 of 29