WEIDA WCMB4016R4X

WCMB4016R4X
256K x 16 Static RAM
Features
and BHE are HIGH). The input/output pins (I/O0 through I/O15)
are placed in a high-impedance state when: deselected (CE
HIGH), outputs are disabled (OE HIGH), both Byte High Enable and Byte Low Enable are disabled (BHE, BLE HIGH), or
during a write operation (CE LOW and WE LOW).
• Low voltage range:
— 1.65V−1.95V
• Ultra-low active power
— Typical Active Current: 0.5 mA @ f = 1 MHz
Functional Description
The WCMB4016R4X is a high-performance CMOS static
RAM organized as 256K words by 16 bits. This device features
advanced circuit design to provide ultra-low active current.
This device is ideal for portable applications such as cellular
telephones. The device also has an automatic power-down
feature that significantly reduces power consumption by 99%
when addresses are not toggling. The device can also be put
into standby mode when deselected (CE HIGH or both BLE
Reading from the device is accomplished by taking Chip Enable (CE) and Output Enable (OE) LOW while forcing the Write
Enable (WE) HIGH. If Byte Low Enable (BLE) is LOW, then
data from the memory location specified by the address pins
will appear on I/O0 to I/O7. If Byte High Enable (BHE) is LOW,
then data from memory will appear on I/O8 to I/O15. See the
Truth Table at the back of this data sheet for a complete description of read and write modes.
The WCMB4016R4X is available in a 48-ball FBGA package.
Logic Block Diagram
256K x 16
RAM Array
2048 X 2048
I/O0–I/O7
I/O8–I/O15
Power -Down
Circuit
BHE
WE
CE
OE
BLE
A17
A15
A16
COLUMN DECODER
A11
A6
A5
A4
A3
A2
A1
A0
A12
A13
A14
A10
A9
A8
A7
ROW DECODER
DATA IN DRIVERS
SENSE AMPS
•
•
•
•
— Typical Active Current: 2 mA @ f = fmax (70 ns speed)
Low standby power
Easy memory expansion with CE and OE features
Automatic power-down when deselected
CMOS for optimum speed/power
Writing to the device is accomplished by taking Chip Enable
(CE) and Write Enable (WE) inputs LOW. If Byte Low Enable
(BLE) is LOW, then data from I/O pins (I/O0 through I/O7), is
written into the location specified on the address pins (A0
through A17). If Byte High Enable (BHE) is LOW, then data
from I/O pins (I/O8 through I/O15) is written into the location
specified on the address pins (A0 through A17).
CE
BHE
BLE
Created January 17, 2002
WCMB4016R4X
Pin Configuration[1, 2]
FBGA
Top View
1
2
3
4
5
6
BLE
OE
A0
A1
A2
NC
A
I/O8
BHE
A3
A4
CE
I/O0
B
I/O9
I/O10
A5
A6
I/O1
I/O2
C
VSS
I/O11 A17
A7
I/O3
Vccq
D
VCC
I/O12 DNU
A16
I/O4
Vssq
E
I/O14
I/O13
A14
A15
I/O5
I/O6
F
I/O15
NC
A12
A13
WE
I/O7
G
NC
A8
A9
A10
A11
NC
H
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ..................................... −65°C to +150°C
Ambient Temperature with
Power Applied.................................................. −55°C to +125°C
Supply Voltage to Ground Potential .................−0.2V to +2.4V
DC Voltage Applied to Outputs
in High Z State[3]........................................ −0.2V to VCC + 0.2V
DC Input Voltage[3].................................... −0.2V to VCC + 0.2V
Output Current into Outputs (LOW)............................. 20 mA
Static Discharge Voltage........................................... >2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current.................................................... >200 mA
Operating Range
Device
WCMB4016R4X
Range
Ambient Temperature
VCC
Industrial
−40°C to +85°C
1.65V to 1.95V
Product Portfolio
Power Dissipation (Industrial)
Operating (ICC)
VCC Range
Product
WCMB4016R4X
VCC(min.) VCC(typ.)[4]
1.65V
1.80V
f = 1 MHz
f = fmax
Standby (ISB2)
VCC(max.)
Speed
Typ.[4]
Max.
Typ.[4]
Max.
Typ.[4]
Max.
1.95V
70 ns
0.5 mA
3 mA
2 mA
6 mA
1 µA
10 µA
Notes:
1. NC pins are not connected to the die.
2. E3 (DNU) can be left as NC or VSS to ensure proper application.
3. VIL(min) = −2.0V for pulse durations less than 20 ns.
4. Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at VCC = VCC(typ) Typ, TA = 25°C.
Page 2 of 12
WCMB4016R4X
Electrical Characteristics Over the Operating Range
WCMB4016R4X
Parameter
Description
Test Conditions
Min.
VOH
Output HIGH Voltage
IOH = -0.1 mA
VCC = 1.65V
VOL
Output LOW Voltage
IOL = 0.1 mA
VCC = 1.65V
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
IIX
IOZ
Typ.[4]
Max.
1.4
Unit
V
0.2
V
1.4
VCC +
0.2V
V
−0.2
0.4
V
Input Leakage Current GND < VI < VCC
−1
+1
µA
Output Leakage
Current
GND < VO < VCC, Output Disabled
−1
+1
µA
VCC Operating Supply
Current
f = fMAX = 1/tRC
2
6
mA
ICC
0.5
3
mA
CE > VCC − 0.2V,
VIN > VCC − 0.2V, VIN < 0.2V
f = fMAX (Address and Data Only),
f = 0 (OE, WE, BHE, and BLE)
1
10
µA
ISB1
Automatic CE
Power-Down Current— CMOS Inputs
Automatic CE
Power-Down Current— CMOS Inputs
CE > VCC − 0.2V
VIN > VCC − 0.2V or VIN < 0.2V,
f = 0, VCC = 1.95V
ISB2
f = 1 MHz
VCC = 1.95V
IOUT = 0 mA
CMOS levels
Capacitance[5]
Parameter
Description
CIN
Input Capacitance
COUT
Output Capacitance
Test Conditions
Max.
Unit
6
pF
8
pF
TA = 25°C, f = 1 MHz,
VCC = VCC(typ)
Thermal Resistance
Description
Thermal Resistance
(Junction to Ambient)[5]
Test Conditions
Symbol
BGA
Unit
Still Air, soldered on a 4.25 x 1.125 inch, 4-layer printed
circuit board
ΘJA
55
°C/W
ΘJC
16
°C/W
Thermal Resistance
(Junction to Case)[5]
Note:
5. Tested initially and after any design or process changes that may affect these parameters.
Page 3 of 12
WCMB4016R4X
AC Test Loads and Waveforms
R1
ALL INPUT PULSES
VCC
VCC Typ
OUTPUT
90%
10%
90%
10%
GND
R2
30 pF
Equivalent to:
Fall Time:
1 V/ns
Rise Time:
1 V/ns
INCLUDING
JIG AND
SCOPE
THÉVENIN EQUIVALENT
RTH
OUTPUT
V
Parameters
1.8V
UNIT
R1
13500
Ohms
R2
10800
Ohms
RTH
6000
Ohms
VTH
0.80
Volts
Data Retention Characteristics (Over the Operating Range)
Parameter
Description
Conditions
VDR
VCC for Data Retention
ICCDR
Data Retention Current
tCDR[5]
Chip Deselect to Data
Retention Time
tR[6]
Operation Recovery Time
Min.
Typ.[4]
1.0
VCC = 1.0V
CE > VCC − 0.2V,
VIN > VCC − 0.2V or VIN < 0.2V
1
Max.
Unit
1.95
V
8
µA
0
ns
tRC
ns
Data Retention Waveform[7]
DATA RETENTION MODE
VCC
VCC(min.)
tCDR
VDR > 1.0 V
VCC(min.)
tR
CE or
BHE,BHE
Notes:
6. Full device operation requires linear VCC ramp from VDR to VCC(min) > 100 µs or stable at VCC(min) > 100 µs.
7. BHE.BLE is the AND of both BHE and BLE. Chip can be deselected by either disabling the chip enable signals or by disabling both BHE and BLE.
Page 4 of 12
WCMB4016R4X
Switching Characteristics Over the Operating Range[8]
70 ns
Parameter
Description
Min.
Max.
Unit
READ CYCLE
tRC
Read Cycle Time
tAA
Address to Data Valid
70
tOHA
Data Hold from Address Change
tACE
CE LOW to Data Valid
tDOE
OE LOW to Data Valid
tLZOE
OE LOW to Low Z[9]
10
OE HIGH to High Z
tLZCE
CE LOW to Low Z
70
ns
35
ns
ns
25
[9]
10
[9, 10]
ns
ns
5
[9, 10]
tHZOE
ns
70
ns
ns
tHZCE
CE HIGH to High Z
tPU
CE LOW to Power-Up
25
tPD
CE HIGH to Power-Down
70
ns
tDBE
BLE/BHE LOW to Data Valid
70
ns
0
[9]
tLZBE
BLE/BHE LOW to Low Z
tHZBE
BLE/BHE HIGH to High Z[9, 10]
ns
ns
5
ns
25
ns
[11]
WRITE CYCLE
tWC
Write Cycle Time
70
ns
tSCE
CE LOW to Write End
60
ns
tAW
Address Set-Up to Write End
60
ns
tHA
Address Hold from Write End
0
ns
tSA
Address Set-Up to Write Start
0
ns
tPWE
WE Pulse Width
50
ns
tBW
BLE/BHE LOW to Write End
60
ns
tSD
Data Set-Up to Write End
30
ns
tHD
Data Hold from Write End
0
ns
Z[9, 10]
tHZWE
WE LOW to High
tLZWE
WE HIGH to Low Z[9]
25
10
ns
ns
Notes:
8. Test conditions assume signal transition time of 3ns or less, timing reference levels of VCC(typ)/2, input pulse levels of 0 to VCC(typ), and output
loading of the specified IOL/IOH and 30-pF load capacitance.
9. At any given temperature and voltage condition, tHZCE is less than tLZCE, tHZBE is less than tLZBE, tHZOE is less than tLZOE, and tHZWE is less than tLZWE
for any given device.
10. tHZOE, tHZCE, tHZBE, and tHZWE transitions are measured when the outputs enter a high impedance state.
11. The internal write time of the memory is defined by the overlap of WE, CE = VIL, BHE and/or BLE =VIL. All signals must be ACTIVE to initiate
a write and any of these signals can terminate a write by going INACTIVE. The data input set-up and hold timing should be referenced to the
edge of the signal that terminates the write
Page 5 of 12
WCMB4016R4X
Switching Waveforms
[12, 13]
Read Cycle No. 1 (Address Transition Controlled)
tRC
ADDRESS
tOHA
DATA OUT
tAA
PREVIOUS DATA VALID
DATA VALID
[13, 14]
Read Cycle No. 2 (OE Controlled)
ADDRESS
tRC
CE
tPD
tHZCE
tACE
OE
tHZOE
tDOE
BHE/BLE
tLZOE
tHZBE
tDBE
tLZBE
DATA OUT
HIGH IMPEDANCE
HIGH
IMPEDANCE
DATA VALID
tLZCE
VCC
SUPPLY
CURRENT
tPU
ICC
50%
50%
ISB
Notes:
12. Device is continuously selected. OE, CE = VIL, BHE and/or BLE = VIL..
13. WE is HIGH for read cycle.
14. Address valid prior to or coincident with CE, BHE, BLE, transition LOW.
Page 6 of 12
WCMB4016R4X
Switching Waveforms
Write Cycle No. 1(WE Controlled)
[11, 15, 16]
tWC
ADDRESS
tSCE
CE
tAW
tHA
tSA
tPWE
WE
tBW
BHE/BLE
OE
tSD
DATA I/O
tHD
DATAIN VALID
NOTE 17
tHZOE
Write Cycle No. 2 (CE Controlled) [11, 15, 16]
tWC
ADDRESS
tSCE
CE
tSA
tAW
tHA
tPWE
WE
tBW
BHE/BLE
OE
tSD
DATA I/O
tHD
DATAIN VALID
NOTE 17
tHZOE
Notes:
15. Data I/O is high impedance if OE = VIH.
16. If CE goes HIGH simultaneously with WE HIGH, the output remains in a high-impedance state.
17. During this period, the I/Os are in output state and input signals should not be applied.
Page 7 of 12
WCMB4016R4X
Switching Waveforms
[16]
Write Cycle No. 3 (WE Controlled, OE LOW)
tWC
ADDRESS
tSCE
CE
tBW
BHE/BLE
tAW
tHA
tSA
tPWE
WE
tSD
DATAI/O
NOTE 17
tHD
DATAIN VALID
tLZWE
tHZWE
Write Cycle No. 4 (BHE/BLE Controlled, OE LOW)
[16]
tWC
ADDRESS
CE
tSCE
tAW
tHA
tBW
BHE/BLE
tSA
tPWE
WE
tSD
DATA I/O
NOTE 17
tHD
DATAIN VALID
Page 8 of 12
WCMB4016R4X
Typical DC and AC Characteristics
(Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at VCC = VCC Typ, TA = 25°C.)
Standby Current vs. Supply Voltage
Operating Current
vs. Supply Voltage
3.5
2.4
ISB (µA)
ICC (mA)
3.0
(f = fmax)
2.0
1.6
1.2
2.0
1.5
1.0
0.8
(f = 1 MHz)
0.4
0.0
1.65
0.5
0
1.80
SUPPLY VOLTAGE (V)
1.95
1.65
1.80
1.95
SUPPLY VOLTAGE (V)
Access Time vs. Supply Voltage
40
35
TAA (ns)
30
25
20
15
10
1.65
1.8
1.95
SUPPLY VOLTAGE (V)
Truth Table
CE
WE
OE
BHE
BLE
H
X
X
X
X
High Z
Inputs/Outputs
Deselect/Power-Down
Mode
Standby (ISB)
Power
X
X
X
H
H
High Z
Deselect/Power-Down
Standby (ISB)
L
H
L
L
L
Data Out (I/OO–I/O15)
Read
Active (ICC)
L
H
L
H
L
Data Out (I/OO–I/O7);
I/O8–I/O15 in High Z
Read
Active (ICC)
L
H
L
L
H
Data Out (I/O8–I/O15);
I/O0–I/O7 in High Z
Read
Active (ICC)
L
H
H
L
L
High Z
Output Disabled
Active (ICC)
L
H
H
H
L
High Z
Output Disabled
Active (ICC)
L
H
H
L
H
High Z
Output Disabled
Active (ICC)
L
L
X
L
L
Data In (I/OO–I/O15)
Write
Active (ICC)
L
L
X
H
L
Data In (I/OO–I/O7);
I/O8–I/O15 in High Z
Write
Active (ICC)
L
L
X
L
H
Data In (I/O8–I/O15);
I/O0 –I/O7 in High Z
Write
Active (ICC)
Page 9 of 12
WCMB4016R4X
Ordering Information
Speed
(ns)
70
Ordering Code
WCMB4016R4X-FF70
Package
Name
Package Type
Operating
Range
FB48A
48-Ball Fine Pitch BGA
Industrial
Page 10 of 12
WCMB4016R4X
Package Diagrams
48-Ball (6.0 mm x 8.0 mm x 1.0 mm) Fine Pitch BGA, FB48A
Top View
Bottom View
Page 11 of 12
WCMB4016R4X
Document Title: WCMB4016R4X, 256K x 16 Static RAM
REV.
Spec #
ECN #
Issue Date
Orig. of Change
**
38-14012
115228
1/17/02
MGN
Description of Change
New Data Sheet
Page 12 of 12