Winbond Electronics W24257AQ-20, W24257AQ-12, W24257AQ-15, W24257AQ-10, W24257AK-20 Datasheet
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W24257A
CS
WE
OE
32K × 8 HIGH SPEED CMOS STATIC RAM
GENERAL DESCRIPTION
The W24257A is a high speed, low power CMOS static RAM organized as 32768 × 8 bits that
operates on a single 5-volt power supply. This device is manufactured using Winbond's high
performance CMOS technology.
FEATURES
• High speed access time: 10/12/15/20 nS (max.)
• Low power consumption:
− Active: 400 mW (typ.)
• Single +5V power supply
• Fully static operation
PIN CONFIGURATIONS
A14
A12
I/O1
I/O2
I/O3
V
1
2
A7
3
A6
4
A5
5
A4
6
A3
7
A2
A1
A0
SS
28-pin
8
9
10
11
12
13
14
DIP
28
V
DD
27
WE
26
A13
A8
25
24
A9
A11
23
OE
22
A10
21
20
CS
19
I/O8
18
I/O7
17
I/O6
16
I/O5
I/O4
15
• All inputs and outputs directly TTL compatible
• Three-state outputs
• Available packages: 28-pin 300 mil SOJ, 330
mil SOP, skinny DIP and standard type one
TSOP (8 mm × 13.4 mm)
BLOCK DIAGRAM
VDD
VSS
A0
.
DECODER
.
A14
CS
OE
WE
CONTROL
CORE
ARRAY
DATA I/O
I/O1
.
.
I/O8
A11
A13
V
A14
A12
WE
PIN DESCRIPTION
1
OE
2
3
A9
4
A8
5
6
7
DD
8
9
10
A7
11
A6
12
A5
13
A4
14
A3
28-pin
TSOP
A10
28
CS
27
I/O8
26
I/O7
25
I/O6
24
I/O5
23
I/O4
22
V
21
SS
I/O3
20
I/O2
19
I/O1
18
17
A0
A1
16
A2
15
- 1 - Revision A14
SYMBOL DESCRIPTION
A0−A14
I/O1−I/O8
Address Inputs
Data Inputs/Outputs
Chip Select Input
Write Enable Input
Output Enable Input
VDD Power Supply
VSS Ground
Publication Release Date: May 1997
W24257A
Operating Power
CS
Supply Current
CS
CS
DC CHARACTERISTICS
Absolute Maximum Ratings
PARAMETER RATING UNIT
Supply Voltage to VSS Potential -0.5 to +7.0 V
Input/Output to VSS Potential -0.5 to VDD +0.5 V
Allowable Power Dissipation 1.0 W
Storage Temperature -65 to +150
Operating Temperature 0 to +70
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.
°C
°C
TRUTH TABLE
CS OE WE MODE
H X X Not Selected High Z ISB, ISB1
L H H Output Disable High Z IDD
L L H Read Data Out IDD
L X L Write Data In IDD
I/O1−I/O8
VDD CURRENT
OPERATING CHARACTERISTICS
(VDD = 5V ±10%, VSS = 0V, TA = 0 to 70° C)
PARAMETER SYM. TEST CONDITIONS MIN. TYP. MAX. UNIT
Input Low Voltage VIL - -0.5 - +0.8 V
Input High Voltage VIH - +2.2 - VDD +0.5 V
Input Leakage Current ILI VIN = VSS to VDD -10 - +10
Output Leakage
Current
Output Low Voltage VOL IOL = +8.0 mA - - 0.4 V
Output High Voltage VOH IOH = -4.0 mA 2.4 - - V
Standby Power
Supply Current
Note: Typical characteristics are at VDD = 5V, TA = 25° C.
ILO
IDD
ISB
ISB1
VI/O = VSS to VDD, CS = VIH
or OE = VIH or WE = VIL
= VIL, I/O = 0 mA
Cycle = MIN 12 - - 160 mA
Duty = 100% 15 150 mA
= VIH
Cycle = MIN, Duty = 100%
≥ VDD -0.2V
10 - - 170 mA
20 - - 140 mA
-10 - +10
- - 30 mA
- - 10 mA
µA
µA
- 2 -
W24257A
CAPACITANCE
(VDD = 5V, TA = 25° C, f = 1 MHz)
PARAMETER SYM. CONDITIONS MAX. UNIT
Input Capacitance CIN VIN = 0V 8 pF
Input/Output Capacitance CI/O VOUT = 0V 10 pF
Note: These parameters are sampled but not 100% tested.
THERMAL RESISTANCE
PARAMETER SYM
.
Junction to Case Thermal Resistance
Junction to Ambient Thermal
Resistance
Note: These parameters are only applied to "TSOP" and "SOJ" package types.
θJC
θJA
A. F. R. = 1m/sec, TA = 25° C
A. F. R. = 1m/sec, TA = 25° C
CONDITIONS MAX. UNIT
AC TEST CONDITIONS
PARAMETER CONDITIONS
Input Pulse Levels 0V to 3V
Input Rise and Fall Times 5 nS
Input and Output Timing Reference Level 1.5V
Output Load CL = 30 pF, IOH/IOL = -4 mA/8 mA
20
60
°C/W
°C/W
Publication Release Date: May 1997
- 3 - Revision A14
AC TEST LOADS AND WAVEFORM
W24257A
5V
OUTPUT
R1 480 ohm
30 pF
Including
Jig and
Scope
R2
255 ohm
3.0V
0V
5 nS
90% 90%
10%
10%
OUTPUT
(For TCLZ
5 nS
5V
,
R1 480 ohm
5 pF
Including
Jig and
Scope
TOLZ TCHZ T
, ,
,
OHZTWHZ
R2
255 ohm
,
OW
)
T
- 4 -
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