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57C45-25T
WS57C45 HIGH-SPEED 2K x 8 REGISTERED CMOS PROM/RPROM KEY FEATURES • Ultra-Fast Access Time • DESC SMD Nos. 5962-88735/5962-87529 • Pin Compatible with AM27S45 and — 25 ns Setup — 12 ns Clock to Output CY7C245 • Immune to Latch-UP • Low Power Consumption • Fast Programming • Programmable Synchronous or — Up to 200 mA • ESD Protection Exceeds 2000 V • Programmable Asynchronous Initialize Asynchronous Output Enable 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 CERDIP/Plastic DIP/ Flatpack NC A5 A6 A7 VCC A8 A9 4 3 2 A4 A3 A2 A1 A0 NC O0 28 27 26 1 5 25 6 24 7 23 8 22 9 21 10 20 11 19 12 13 14 15 16 17 18 O1 O2 A10 INIT/VPP OE/OES CP/PGM NC O7 O6 NC O3 O4 O5 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 VCC A8 A9 A10 INIT/VPP OE/OES CP/PGM O7 O6 O5 O4 O3 GND PRODUCT SELECTION GUIDE PARAMETER WS57C45-25 WS57C45-35 WS57C45-45 Set Up Time (Max) 25 ns 35 ns 45 ns Clock to Output (Max) 12 ns 15 ns 25 ns Return to Main Menu 2-21
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