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| WS57C256F MILITARY HIGH SPEED 32K x 8 CMOS EPROM KEY FEATURES * Fast Access Time -- 55 ns * EPI Processing -- Latch-up Immunity Up to 200 mA * Low Power Consumption * DESC SMD No. 5962-86063 * Standard EPROM Pinout GENERAL DESCRIPTION The WS57C256F is a High Performance 256K UV Erasable Electrically Programmable Read Only Memory. It is manufactured using an advanced CMOS process technology enabling it to operate at speeds as fast as 55 ns Access Time. Two major features of the WS57C256F are its Low Power and High Speed. While operating in a TTL environment it consumes less than 120 mA while cycling at full speed. Additionally, the WS57C256F can be placed in a standby mode which drops operating current below 5 mA in a TTL environment and 500 A in a CMOS environment. The WS57C256F also has exceptional output drive capability. It can source 4 mA and sink 16 mA per output. The WS57C256F is configured in the standard EPROM pinout which provides an easy upgrade path for systems which are currently using standard EPROMs. MODE SELECTION PINS MODE Read Output Disable Standby Program Program Verify Program Inhibit Signature3 CE/ PGM VIL X VIH VIL X VIH VIL VIL OE VIL VIH X VIH VIL VIH VIL VIL A9 X X X X X X A0 X X X X X X VPP VCC OUTPUTS VCC VCC VCC VCC VCC VCC VPP 2 VCC VPP 2 VCC VPP2 VCC DOUT High Z High Z DIN DOUT High Z 23 H4 EO H 5 PIN CONFIGURATION TOP VIEW Chip Carrier A7 A12 VPP NC VCC A14 A13 VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 GND CERDIP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC A14 A13 A8 A9 A11 OE A10 CE/PGM O7 O6 O5 O4 O3 VH2 VIL VCC VCC VH2 VIH VCC VCC A6 A5 A4 A3 A2 A1 A0 NC O0 32 31 30 1 5 29 6 28 7 27 8 26 9 25 10 24 11 23 12 22 13 21 14 15 16 17 18 19 20 O1 O2 GND 432 A8 A9 A11 NC OE A10 CE/PGM O7 O6 NC O3 O4 O5 NOTES: 1. X can be VIL or VIH. 2. VIH = VPP = 12.75 0.25 V. 3. A1 - A8, A10 - A14 = VIL. 4. Manufacturer Signature. 5. Device Signature. PRODUCT SELECTION GUIDE PARAMETER Address Access Time (Max) Output Enable Time (Max) WS57C256F-55 55 ns 25 ns WS57C256F-70 70 ns 30 ns Return to Main Menu 4-17 WS57C256F ORDERING INFORMATION PART NUMBER WS57C256F-55CMB WS57C256F-55DMB WS57C256F-55TMB WS57C256F-70CMB* WS57C256F-70DMB* SPEED (ns) 55 55 55 70 70 PACKAGE TYPE 32 Pad CLLCC 28 Pin CERDIP, 0.6" 28 Pin CERDIP, 0.3" 32 Pad CLLCC 28 Pin CERDIP, 0.6" OPERATING PACKAGE TEMPERATURE DRAWING RANGE C2 D2 T2 C2 D2 Military Military Military Military Military WSI MANUFACTURING PROCEDURE MIL-STD-883C MIL-STD-883C MIL-STD-883C MIL-STD-883C MIL-STD-883C NOTES: The actual part marking will not include the initials "WS." *SMD product. See page 4-1 for DESC SMD number. PROGRAMMING/ALGORITHMS/ERASURE/PROGRAMMERS REFER TO PAGE 5-1 The WS57C256F is programmed using Algorithm D shown on page 5-9. For complete data sheet and electrical specifications see page 3-13. Return to Main Menu 4-18 |
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