PRODUCT SELECTION GUIDE

PARAMETER

191C/291C-25

191C/291C-35

191C/291C-45

191C/291C-55

Address Access Time (Max)

25 ns

35 ns

45 ns

55 ns

CS to Output Valid Time (Max)

12 ns

20 ns

20 ns

20 ns

HIGH SPEED 2K x 8 CMOS PROM/RPROM

KEY FEATURES

and N82S191 Bipolar PROMs

— Up to 200 mA

GENERAL DESCRIPTION

The WS57C191C/291C is an extremely High Performance 16K UV Erasable Electrically Re-Programmable Read

Only Memory (RPROM). It is manufactured in an advanced CMOS technology which enables it to operate at Bipolar

PROM speeds while consuming only 25% of the power required by its Bipolar counterparts. The WS57C191C/291C

is also configured in the standard Bipolar PROM pinout which provides an easy upgrade path for systems which are

currently using Bipolar PROMs.

The WS57C191C is packaged in a conventional 600 mil DIP package as well as a Plastic Leaded Chip Carrier

(PLDCC) and a Ceramic Leadless Chip Carrier (CLLCC). The WS57C291C is packaged in a space saving 300 mil

DIP package configuration. Both are available in commercial, industrial, and military operating temperature ranges.

WS57C191C/291C

A10

CS2

CS3

GND

CS2

CS3

NC

NC

NC

GND

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

1

43

2

28 27 26

25

24

23

22

21

20

19

5

6

7

8

9

10

11

12 13 14 15 16 17 18

TOP VIEW

Chip Carrier

CERDIP/Plastic DIP

PIN CONFIGURATION

2-7

ROW

DECODER

EPROM ARRAY

16,384 BITS

COLUMN

DECODER

SENSE

AMPLIFIERS

8

CS2

CS3

OUTPUTS

A0 - A4

COLUMN

ADDRESSES

A5 - A10

ROW

ADDRESSES

6

5

BLOCK DIAGRAM

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