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NOT FOR NEW DESIGN

November 2000

This is information on a product still in production but not recommended for new designs.

M27256

NMOS 256 Kbit (32Kb x 8) UV EPROM

s

FAST ACCESS TIME: 170ns

s

EXTENDED TEMPERATURE RANGE

s

SINGLE 5V SUPPLY VOLTAGE

s

LOW STANDBY CURRENT: 40mA max

s

TTL COMPATIBLE DURING READ and

PROGRAM

s

FAST PROGRAMMING ALGORITHM

s

ELECTRONIC SIGNATURE

s

PROGRAMMING VOLTAGE: 12V

DESCRIPTION

The M27256 is a 262,144 bit UV erasable and

electrically programmable memory EPROM. It is

organized as 32.768 words by 8 bits.

The M27256 is housed in a 28 pin Window Ceram-

ic Frit-Seal Dual-in-Line package. The transparent

lid 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 pro-

gramming procedure.

Figure 1. Logic Diagram

AI00767B

15

A0-A14

Q0-Q7

VPP

VCC

M27256

G

E

VSS

8

1

28

FDIP28W (F)