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IDT71256SA15P

CMOS STATIC RAM 256K (32K x 8-BIT)

Integrated Device Technology 

IDT71256SA

CMOS STATIC RAM 256K (32K x 8-BIT)

PIN CONFIGURATIONS

A14

A12

A7

A6

A5

A4

A3

A2

A1

A0

I/O0

I/O1

I/O2

GND

1

28

2

27

3

26

4

25

5

24

6

23

7

SO28-5

P28-2

22

8 P28-1 21

9

20

10

19

11

18

12

17

13

16

14

15

VCC

WE

A13

A8

A9

A11

OE

A10

CS

I/O7

I/O6

I/O5

I/O4

I/O3

2948 drw 02

DIP/SOJ

TOP VIEW

OE

22

A 11

23

A9

24

A8

25

A 13

26

WE

27

V CC

28

A 14 1

A 12 2

A7 3

A6 4

A5 5

A4 6

A3 7

SO28-8

TSOP

TOP VIEW

INDUSTRIAL AND COMMERCIAL TEMPERATURE RANGES

21 A 10

20 CS

19 I/O7

18 I/O6

17 I/O5

16 I/O4

15 I/O3

14 GND

13 I/O2

12 I/O1

11 I/O0

10 A 0

9 A1

8 A2

2948 drw 11

ABSOLUTE MAXIMUM RATINGS(1)

Symbol

Rating

Value

Unit

VCC Supply Voltage

Relative to GND

–0.5 to +7.0

V

VTERM Terminal Voltage

Relative to GND

–0.5 to VCC+0.5

V

TBIAS Temperature

Under Bias

–55 to +125

°C

TSTG

Storage

Temperature

–55 to +125

°C

PT Power

Dissipation

1.0

W

IOUT

DC Output

Current

50

mA

NOTES:

2948 tbl 02

1. 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.

TRUTH TABLE(1,2)

CS

OE

WE

I/O

L

L

H DATAOUT

L

X

L DATAIN

L

H

H High-Z

H

X

X High-Z

VHC(3) X

X High-Z

NOTES:

1. H = VIH, L = VIL, x = Don't care.

2. VLC = 0.2V, VHC = VCC –0.2V.

3. Other inputs ≥VHC or ≤VLC.

Function

Read Data

Write Data

Outputs Disabled

Deselected — Standby (ISB)

Deselected — Standby (ISB1)

2948 tbl 04

RECOMMENDED DC OPERATING

CONDITIONS

RECOMMENDED OPERATING

TEMPERATURE AND SUPPLY VOLTAGE

Grade

Temperature

GND

VCC

Commercial

Industrial

0°C to +70°C

-40°C to +85°C

0V 4.5V to 5.5V

0V 4.5V to 5.5V

3948 tbl 09

Symbol Parameter

Min. Typ. Max. Unit

VCC

Supply Voltage

4.5 5.0 5.5 V

GND

Supply Voltage

0

0

0

V

VIH

Input High Voltage 2.2 — VCC+0.5 V

VIL

Input Low Voltage –0.5(1) —

0.8

V

NOTE:

2948 tbl 01

1. VIL (min.) = –1.5V for pulse width less than 10ns, once per cycle.

DC ELECTRICAL CHARACTERISTICS

VCC = 5.0V ± 10%

IDT71256SA

Symbol

Parameter

Test Condition

Min.

Max.

Unit

|ILI|

Input Leakage Current

VCC = Max., VIN = GND to VCC

—

5

µA

|ILO|

Output Leakage Current

VCC = Max., CS = VIH, VOUT = GND to VCC

—

5

µA

VOL

Output Low Voltage

IOL = 8mA, VCC = Min.

—

0.4

V

VOH

Output High Voltage

IOH = –4mA, VCC = Min.

2.4

—

V

2948 tbl 05

2

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