1 - Al Kossow's Bitsavers

MOSLSITMS47648192·WORD BY 8·BIT READ·ONLY MEMORYJUNE 1981 - REVISED JULY 1983• 8192 X 8 Organization• Fully Static (No Clocks, No Refresh)• All Inputs and Outputs TTL Compatible• Single 5-V Power Supply• Maximum Access Time From Address:TMS4764-30TMS4764-35TMS4764-45300 ns350 ns450 ns• Typical Active Power Dissipation... 275 mWTMS4764 ••. JL OR NL PACKAGE(TOP VIEWIA5A4A3Vss .......... _~:.r--VCCA8descriptionPIN NOMENCLATUREAO - A12 Addresses01 - 08 Data OutSISChip SelectVCC+5-V SupplyVSSGroundThe TMS4764 is a 65,536-bit read-only memory organized as 8192 words of 8-bit length. This makes the TMS4764ideal for microprocessor based systems. The device is fabricated using N-channel silicon-gate technology for highspeed and simple interface with bipolar circuits.enQ)(JoS;Q)c:?!oa:All inputs can be driven directly by Series 74 TTL circuits without the use of any internal pull-up resistor. Each outputcan drive two Series 74 or 74S loads without 'external resistors. The data outputs are three-state for OR-tieing multipledevices on a common bus. Pin 20 is programmable, providing additional system flexibility. The data is alwaysavailable, it is not dependent on external clocking of pin 20.The TMS4764 is designed for high-density fixed-memory applications such as logic function generation andmicroprogramming. It is pin compatible with TI's full line of ROMs and EPROMs.This ROM is supplied in 24-pin dual-in-line-plastic (NL suffix) or ceramic (JL suffix) packages designed for insertionin mounting-hole rows on 600-mil centers or chip on board. The device is designed for operation from OOC to 70°C.operationaddress (AO - A 12)The address-valid interval determines the device cycle time. The 13·bit positive-logic address is decoded on-chip toselect one of 8192 words of 8-bit length in the memory array. AD is the least-significant bit and A 12 the most-significantbit of the word address.chip select (S or 51Pin 20 can be programmed during mask fabrication to be active with either a high- or a low-level input. When thesignal is active, all eight outputs are enabled and the eight-bit addressed word can be read. When the signal is notactive, all eight outputs are in a high-impedance state.'TEXASINSTRUMENTSPOST OFFICE BOX 225012 • DALLAS, TEXAS 75265'Copyright © 1983 by Texas Instruments Incorporated7-13