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| WS57C45 MILITARY 2K x 8 REGISTERED CMOS PROM/RPROM KEY FEATURES * Ultra-Fast Access Time -- 35 ns Setup -- 15 ns Clock to Output * DESC SMD Nos. 5962-88735/5962-87529 * Pin Compatible with AM27S45 and CY7C245 * Immune to Latch-UP -- Up to 200 mA * Low Power Consumption * Fast Programming * Programmable Synchronous or Asynchronous Output Enable * ESD Protection Exceeds 2000 Volts * 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 CERDIP 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 PRODUCT SELECTION GUIDE PARAMETER Set Up Time (Max) Clock to Output (Max) WS57C45-35 35 ns 15 ns WS57C45-45 45 ns 25 ns Return to Main Menu 4-5 WS57C45 ORDERING INFORMATION PART NUMBER WS57C45-35TMB* WS57C45-45KMB* WS57C45-45TMB* SPEED (ns) 35 45 45 PACKAGE TYPE 24 Pin CERDIP, 0.3" 24 Pin CERDIP, 0.3" 24 Pin CERDIP, 0.3" OPERATING WSI PACKAGE TEMPERATURE MANUFACTURING DRAWING RANGE PROCEDURE T1 K1 T1 Military Military Military MIL-STD-883C MIL-STD-883C MIL-STD-883C 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 REFER TO PAGE 5-1 The WS57C45 is programmed using Algorithm A shown on page 5-3. For complete data sheet and electrical specifications see page 2-21. Return to Main Menu 4-6 |
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