View m27c1024 datasheet:

M27C1024 1 Mbit (64Kb x16) UV EPROM and OTP EPROM 5V ± 10% SUPPLY VOLTAGE in READ OPERATION FAST ACCESS TIME: 35ns LOW POWER CONSUMPTION: 40 40 – Active Current 35mA at 5MHz – Standby Current 100µA 1 1 PROGRAMMING VOLTAGE: 12.75V ± 0.25V FDIP40W (F) PDIP40 (B) PROGRAMMING TIME: 100µs/byte (typical) ELECTRONIC SIGNATURE – Manufacturer Code: 0020h – Device Code: 008Ch DESCRIPTION PLCC44 (C) TSOP40 (N) The M27C1024 is a 1 Mbit EPROM offered in the 10 x 14mm two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for micro- processorsystems requiring large data or program storage and is organized as 65,536 words of 16 bits. Figure 1. Logic Diagram The FDIP40W (window ceramic frit-seal package) has a transparent lid which allows the u