WS57C45 Datasheet, PDF (1/9 Pages) STMicroelectronics – HIGH-SPEED 2K x 8 REGISTERED CMOS PROM/RPROM

WS57C45
HIGH-SPEED 2K x 8 REGISTERED CMOS PROM/RPROM
KEY FEATURES
• Ultra-Fast Access Time
— 25 ns Setup
— 12 ns Clock to Output
• Low Power Consumption
• Fast Programming
• Programmable Synchronous or
Asynchronous Output Enable
• 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 V
• 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.
PIN CONFIGURATION
TOP VIEW
Chip Carrier
NC
A₅ A₆ A₇ V_CC A₈ A₉
A₄
4
5
3
2
1
28 27 26
25
A₁₀
A₃ 6
24 INIT/V_PP
A₂ 7
23 OE/OE_S
A₁ 8
22 CP/PGM
A₀ 9
21 NC
NC 10
20 O₇
O₀ 11
19 O₆
12 13 14 15 16 17 18
O₁ O₂ NC O₃ O₄ O₅
GND
CERDIP/Plastic DIP/
Flatpack
A₇ 1
A₆ 2
A₅ 3
A₄ 4
A₃ 5
A₂ 6
A₁ 7
A₀ 8
O₀ 9
O₁ 10
O₂ 11
GND 12
24 V_CC
23 A₈
22 A₉
21 A10
20 INIT/V_PP
19 OE/OE_S
18 CP/PGM
17 O₇
16 O₆
15 O₅
14 O₄
13 O₃
PRODUCT SELECTION GUIDE
PARAMETER
Set Up Time (Max)
Clock to Output (Max)
WS57C45-25
25 ns
12 ns
Return to Main Menu
WS57C45-35
35 ns
15 ns
WS57C45-45
45 ns
25 ns
2-21