SGS Thomson Microelectronics WS57C45 Datasheet
WS57C45
4-5
PRODUCT SELECTION GUIDE
PARAMETER WS57C45-35 WS57C45-45
Set Up Time (Max) 35 ns 45 ns
Clock to Output (Max) 15 ns 25 ns
MILITARY 2K x8 REGISTERED CMOS PROM/RPROM
KEY FEATURES
• Ultra-Fast Access Time • DESC SMD Nos. 5962-88735/5962-87529
— 35 ns Setup • Pin Compatible with AM27S45 and
— 15 ns Clock to Output
CY7C245
• Low Power Consumption • Immune to Latch-UP
• Fast Programming
— Up to 200 mA
• Programmable Synchronous or • ESD Protection Exceeds 2000 Volts
Asynchronous Output Enable
• Programmable Asynchronous Initialize
Register
GENERAL DESCRIPTION
The WS57C45 is an extremely High Performance 16K UV Erasable Registered CMOS RPROM. It is a direct
drop-in replacement for such devices as the AM27S45 and CY7C245.
To meet the requirements of systems which execute and fetch instructions simultaneously, an 8-bit parallel data
register has been provided at the output which allows RPROM data to be stored while other data is being
addressed.
An asynchronous initialization feature has been provided which enables a user programmable 2049th word to be
placed on the outputs independent of the system clock. This feature can be used to force an initialize word or
provide a preset or clear function.
A further advantage of the WS57C45 over Bipolar PROM devices is the fact that it utilizes a proven EPROM
technology. This enables the entire memory array to be tested for switching characteristics and functionality after
assembly. Unlike devices which cannot be erased, every WS57C45 RPROM in a windowed package is 100%
tested with worst case test patterns both before and after assembly.
V
CC
A
8
A
9
A
10
INIT/V
PP
OE/OE
S
CP/PGM
O
7
O
6
O
5
O
4
O
3
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
O
0
O
1
O
2
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
PIN CONFIGURATION
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ORDERING INFORMATION
SPEED PACKAGE PACKAGE
OPERATING WSI
PART NUMBER
(ns) TYPE DRAWING
TEMPERATURE MANUFACTURING
RANGE PROCEDURE
WS57C45-35TMB* 35 24 Pin CERDIP, 0.3" T1 Military MIL-STD-883C
WS57C45-45KMB* 45 24 Pin CERDIP, 0.3" K1 Military MIL-STD-883C
WS57C45-45TMB* 45 24 Pin CERDIP, 0.3" T1 Military MIL-STD-883C
WS57C45
4-6
PROGRAMMING/ALGORITHMS/ERASURE/PROGRAMMERS
REFER TO
PAGE 5-1
The WS57C45 is programmed using Algorithm A shown on page 5-3.
NOTE: The actual part marking will not include the initials "WS."
*SMD product. See page 5-1 for DESC SMD numbers.
For complete data sheet and electrical specifications see page 2-21.
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