
PRODUCT SELECTION GUIDE
PARAMETER
WS57C191C/291C-35
WS57C191C/291C-45
WS57C191C/291C-55
Address Access Time (Max)
35 ns
45 ns
55 ns
CS to Output Valid Time (Max)
20 ns
MILITARY HIGH SPEED 2K x 8 CMOS PROM/RPROM
KEY FEATURES
Ultra-Fast Access Time
Pin Compatible with Am27S191/291
— tACC = 35 ns
and N82S191 Bipolar PROMs
—tCS = 20 ns
Immune to Latch-UP
Low Power Consumption
— Up to 200 mA
Fast Programming
ESD Protection Exceeds 2000V
Available in 300 and 600 Mil DIP
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. The WS57C291C is packaged in a space
saving 300 mil DIP package configuration.
WS57C191C/291C
PINS
CS1/VPP CS2
CS3
VCC
OUTPUTS
MODE
Read
VIL
VIH
VIH VCC
DOUT
Output
Disable
VIH
XX
VCC
High Z
Output
XVIL
XVCC
High Z
Disable
Program
VPP
XX
VCC
DIN
Program
Verify
VIL
VIH
VIH VCC
DOUT
Output
Disable
XX
VIL
VCC
High Z
VCC
A8
A9
A10
CS1/VPP
CS2
CS3
O7
O6
O5
O4
O3
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
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
TOP VIEW
CERDIP
MODE SELECTION
PIN CONFIGURATION
4-3
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