1 - Al Kossow's Bitsavers

MOSLSITMS27128131,072·BIT ERASABLE PROGRAMMABLE READ·ONLY MEMORYOCTOBER 1983 - REVISED JANUARY 1984• 16,384 X 8 Organization• Single +S-V Power Supply• Pin Compatible with TMS2764 EPROM• All Inputs and Outputs Are TTL Compatible• Max Access/Min Cycle Time:TMS27128-25TMS27128-30TMS27128-45250 ns300 ns450 ns• Low Active Current- 100 rnA (Maximum)• JEDEC Approved Pinout• Fast Programming AlgorithmdescriptionThe TMS27128 is an ultraviolet light-erasable, electricallyprogrammable read-only memory. It has131,072 bits organized as 16,384 words of 8-bitlength. The TMS27128 only requires a single 5-voltpower supply. The TMS27128-25 provides an accesstime of 250 ns, which is compatible with high-speedmicroprocessors.TMS27128 .•• JL PACKAGE(TOP VIEW)AO-A 13EGGNDPGM01-08VeeVPPVPPA12A7A6A5A4A3A2AlveePGMA13A8A9AllGAl0EAO 0801 0702 0603 05GND 04PIN NOMENCLATUREAddressesehip Enable/Power DownOutput EnableGroundProgramOutputs+ 5-V Power Supply+21-V Power SupplyThe TMS27128 provides two output control lines: Output Enable (GI and Chip Enable/Power Down {EL This featureallows the G control line to eliminate bus contention in microprocessor systems. The TMS27128 has a standby modethat reduces the maximum power dissipation from 525 mW to 210 mW when the device is placed on standby.operationThis EPROM is supplied in a 28-pin dual-in-line ceramic package (JL suffix). It is pin compatible with the TMS2764EPROM and is designed for operation from OOC to 70°C.The six modes of operation for the TMs27128 are listed in the following table.FUNCTION(PINS)E(20)G(22)PGM(27)Vpp(1)Vee(28)01-08ReadMODEOutput Power Down Fast Program InhibitDisable (Standby) Programming Verification ProgrammingVIL X VIH VIL VIL VIHVIL VIH X VIH VIL XVIH VIH X VIL VIH XVeeVeeVee Vpp Vpp XVee Vee Vee Vee Vee Vee(11 to 13. 0 HI-Z HI-Z D 0 HI-Z15 to 19)(I)Q)CJ'>Q)Q:!oa:c.w4PRODUCT PREVIEWThis document contains Information on a product underdevelopment. Texas Instruments reserves the right tochange or discontinue this product without notice.TEXASINSTRUMENTSPOST OFFICE BOX 225012 • DALLAS. TEXAS 75265Copyright © 1983 by Texas Instruments Incorporated6-61