ws57c45-45tmb STMicroelectronics, ws57c45-45tmb Datasheet

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ws57c45-45tmb

Manufacturer Part Number
ws57c45-45tmb
Description
Military Registered Cmos Prom/rprom
Manufacturer
STMicroelectronics
Datasheet
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.
PIN CONFIGURATION
PRODUCT SELECTION GUIDE
Ultra-Fast Access Time
— 35 ns Setup
— 15 ns Clock to Output
Low Power Consumption
Fast Programming
Programmable Synchronous or
Asynchronous Output Enable
MILITARY 2K x 8 REGISTERED CMOS PROM/RPROM
Set Up Time (Max)
Clock to Output (Max)
Return to Main Menu
PARAMETER
GENERAL DESCRIPTION
GND
KEY FEATURES
O
O
O
A
A
A
A
A
A
A
A
7
6
5
4
3
2
1
0
0
1
2
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
CERDIP
DESC SMD Nos. 5962-88735/5962-87529
Pin Compatible with AM27S45 and
CY7C245
Immune to Latch-UP
— Up to 200 mA
ESD Protection Exceeds 2000 Volts
Programmable Asynchronous Initialize
Register
WS57C45-35
24
23
22
21
20
19
18
17
16
15
14
13
35 ns
15 ns
V
A
A
A 10
INIT/V
OE/OE
CP/PGM
O
O
O
O
O
CC
8
9
7
6
5
4
3
PP
S
WS57C45-45
45 ns
25 ns
WS57C45
4-5

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ws57c45-45tmb Summary of contents

Page 1

... 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 ...

Page 2

... WS57C45-35TMB 35 * WS57C45-45KMB 45 * WS57C45-45TMB 45 NOTE: The actual part marking will not include the initials "WS." * SMD product. See page 5-1 for DESC SMD numbers. PROGRAMMING/ALGORITHMS/ERASURE/PROGRAMMERS The WS57C45 is programmed using Algorithm A shown on page 5-3. For complete data sheet and electrical specifications see page 2-21. ...

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