STK20C04-W35 datasheet(1/8 Pages) ETC

Part #	STK20C04-W35

Description	CMOS nvSRAM High Performance 512 x 8 Nonvolatile Static RAM

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STK20C04

2-39

DESCRIPTION

The Simtek STK20C04 is a fast static RAM (30, 35,

45ns), with a nonvolatile electrically-erasable PROM

(EEPROM) element incorporated in each static memory

cell. The SRAM can be read and written an unlimited

number of times, while independent nonvolatile data

resides in EEPROM. Data may easily be transferred

from the SRAM to the EEPROM (STORE), or from the

EEPROM

to the SRAM (RECALL) using the NE pin. It

combines the high performance and ease of use of a

fast SRAM with nonvolatile data integrity.

The STK20C04 features the industry standard pinout

for nonvolatile RAMs in a 28-pin 600 mil plastic DIP.

PIN NAMES

A0 - A8

Address Inputs

W

Write Enable

DQ0 - DQ7

Data In/Out

E

Chip Enable

G

Output Enable

NE

Nonvolatile Enable

VCC

Power (+5V)

VSS

Ground

STK20C04

CMOS nvSRAM

High Performance

512 x 8 Nonvolatile Static RAM

FEATURES

• 30, 35 and 45ns Access Times

• 15, 20 and 25ns Output Enable Access

• Unlimited Read and Write to SRAM

• Hardware STORE Initiation

• Automatic STORE Timing

• 105 STORE cycles to EEPROM

• 10 year data retention in EEPROM

• Automatic RECALL on Power Up

• Hardware RECALL Initiation

• Unlimited RECALL cycles from EEPROM

• Single 5V

±10% Operation

• Commercial and Industrial Temperatures

• Available in 600 mil PDIP package

28

27

26

25

24

23

22

21

20

19

18

17

16

15

DQ

V

W

NC

A

NC

G

NC

E

8

7

6

5

4

3

CC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

NE

NC

A

DQ

DO

VSS

7

6

5

4

3

2

1

0

1

2

LOGIC BLOCK DIAGRAM

PIN CONFIGURATIONS

28 - 600 PDIP

A

3

4

5

6

7

8

EEPROM ARRAY

64 X 64

STORE

RECALL

STATIC RAM

ARRAY

64 X 64

STORE/

RECALL

CONTROL

AA

A

01

2

DQ

0

1

2

3

4

5

6

7

G

NE

E

W

COLUMN I/O

COLUMN DECODER

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