2764A

M27C64A 64K (8K x 8) UV EPROM and OTP ROM VERY FAST ACCESS TIME: 150ns COMPATIBLE with HIGH SPEED MICROPROCESSORS, ZERO WAIT STATE LOW POWER “CMOS” CONSUMPTION: – Active Current 30mA – Standby Current 100µA PROGRAMMING VOLTAGE: 12.5V ELECTRONIC SIGNATURE for AUTOMATED PROGRAMMING HIGH SPEED PROGRAMMING (less than 1 minute) 28 1 FDIP28W (F) PLCC32 (C) DESCRIPTION The M27C64A is a high speed 65,536 bit UV erasable and electrically programmable memory EPROM ideally suited for microprocessor systems requiring large programs. It is organized as 8,192 by 8 bits. The 28 pin Window Ceramic Frit-Seal Dual-in-Line package has transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern. Anew pattern can then be written to the device by following the programming procedure. For applications where the content is programmed only on time and erasure is not required, the M27C64A is offered in Plastic Leaded Chip Carrier package. Figure 1. Logic Diagram VCC VPP 13 A0-A12 8 Q0-Q7 P M27C64A Table 1. Signal Names A0 - A12 Q0 - Q7 E G P VPP VCC VSS Address Inputs Data Outputs Chip Enable Output Enable Program Program Supply Supply Voltage Ground E G VSS AI00834B March 1995 1/11 M27C64A Figure 2A. DIP Pin Connections Figure 2B. LCC Pin Connections AI00835 VSS DU Q3 Q4 Q5 AI00836 VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 VSS 1 28 2 27 3 26 4 25 5 24 6 23 7 22 M27C64A 8 21 9 20 10 19 11 18 12 17 13 16 14 15 VCC P NC A8 A9 A11 G A10 E ...