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IDT7198L

CMOS STATIC RAMs 64K (16K x 4-BIT) Added Chip Select and Output Controls

Integrated Device Technology 

IDT7198S/L

CMOS STATIC RAM 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls

MILITARY TEMPERATURE RANGE

MEMORY CONTROL

The IDT7198 64K high-speed CMOS static RAM incorpo-

rates two additional memory control features (an extra chip

select and an output enable pin) which offer additional ben-

efits in many system memory applications.

Both chip selects, Chip Select 1 (CS1) and Chip Select 2

(CS2), must be LOW to select the memory. If either chip select

is pulled HIGH, the memory will be deselected and remain in

the standby mode. This dual chip select feature (CS1, CS2)

also brings the convenience of improved system speeds to the

large memory designer by reducing the external logic required

to perform decoding.

PIN DESCRIPTIONS

Name

Description

A0–A13

Address Inputs

CS1

Chip Select 1

CS2

Chip Select 2

WE

Write Enable

OE

Output Enable

I/O0–I/O3

Data I/O

VCC

Power

GND

Ground

2985 tbl 01

PIN CONFIGURATIONS

A0 1

24

A1 2

23

A2 3

22

A3 4

21

A4 5

A5 6

A6 7

A7 8

A8 9

20

D24-1

E24-1

19

18

17

16

CS1 10

15

OE 11

16

GND 12

15

VCC

A13

A12

A11

A10

A9

CS 2

I/O3

I/O2

I/O1

I/O0

WE

2985 drw 02

DIP/SOJ/CERPACK

TOP VIEW

INDEX

A1

A2

A3

A4

A5

A6

A7

A8

CS 1

3 2 28 27

1

4

26

5

25

6

24

7

23

8 L28-2 22

9

21

10

20

11

19

12

18

13 14 15 16 17

NC

A13

A12

A11

A10

A9

I/O3

I/O2

I/O1

2985 drw 03

LCC

TOP VIEW

TRUTH TABLE(1)

Mode

CS1 CS2 WE

OE

Standby

HXXX

Standby

XHXX

Read

L LHL

Write

L L LX

Read

L L HH

NOTE:

1. H = VIH, L = VIL, X = don't care.

I/O

High-Z

High-Z

DOUT

DIN

High-Z

Power

Standby

Standby

Active

Active

Active

2985 tbl 02

ABSOLUTE MAXIMUM RATINGS(1)

Symbol

Rating

Mil.

Unit

VTERM Terminal Voltage

with Respect to GND

–0.5 to +7.0 V

TA

TBIAS

TSTG

PT

Operating Temperature

Temperature

Under Bias

Storage Temperature

Power Dissipation

–55 to +125 °C

–65 to +135 °C

–65 to +150 °C

1.0

W

IOUT DC Output Current

50

mA

NOTE:

2985 tbl 03

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 condi-

tions for extended periods may affect reliability.

6.4

2

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