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M87C257 Datasheet Address Latched 256k 32k X 8 Uv Eprom And Otp Eprom

Manufacturer: STMicroelectronics

Overview: M87C257 ADDRESS LATCHED 256K (32K x 8) UV EPROM and OTP EPROM INTEGRATED ADDRESS LATCH FAST ACCESS TIME: 45ns LOW POWER “CMOS” CONSUMPTION: – Active Current 30mA – Standby Current 100µA PROGRAMMING VOLTAGE: 12.75V ELECTRONIC SIGNATURE for AUTOMATED PROGRAMMING PROGRAMMING TIMES of AROUND 3sec. (PRESTO II ALGORITHM) 28 1 FDIP28W (F) PLCC32 (C) Figure 1.

General Description

The M87C257 is a high speed 262,144 bit UV erasable and electrically programmable EPROM.

The M87C257 incorporates latches for all address inputs to minimize chip count, reduce cost, and simplify the design of multiplexed bus systems.

The Window Ceramic Frit-Seal Dual-in-Line package has a transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern.

Key Features

  • a 2 line control function which accommodates the use of multiple memory connection. The two line control function allows: a. the lowest possible memory power dissipation, b. complete assurance that output bus contention will not occur. For the most efficient use of these two control lines, E should be decoded and used as the primary device selecting function, while G should be made a common connection to all devices in the array and connected to the READ line from the system control bus. This en.

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Part Number Description

M87C257 Distributor