M87C257

Description

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Description

The M87C257 is a 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and

OTP (one time programmable). It incorporates latches for all address inputs to minimize chip

count, reduce cost, and simplify the design of multiplexed bus systems and is organized as

32,768 by 8 bits.

The FDIP28W (window ceramic frit-seal package) has a transparent lid which allows the

user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be

written to the device by following the programming procedure.

For applications where the content is programmed only one time and erasure is not

required, the M87C257 is offered in PLCC32 package.

In order to meet environmental requirements, ST offers the M87C257 in ECOPACK®

packages.

ECOPACK packages are Lead-free. The category of second Level Interconnect is marked

on the package and on the inner box label, in compliance with JEDEC Standard JESD97.

The maximum ratings related to soldering conditions are also marked on the inner box label.

ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Figure 1.

Logic diagram

AI00928B

15

A0-A14

ASVPP

Q0-Q7

VCC

M87C257

G

E

VSS

8