M27C256B-12N1TR STMicroelectronics, M27C256B-12N1TR Datasheet

M27C256B-12N1TR

Manufacturer Part Number

M27C256B-12N1TR

Description

256 Kbit (32Kb x 8) UV EPROM and OTP EPROM

Manufacturer

STMicroelectronics

Datasheet

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DESCRIPTION

The M27C256Bis a 256 KbitEPROM offeredin the

two ranges UV (ultra violet erase) and OTP (one

time programmable). It is ideally suited for micro-

processor 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

M27C256B is offered in PDIP32, PLCC32 and

TSOP28 (8 x 13.4 mm) packages.

Table 1. Signal Names

July 1998

A0-A14

Q0-Q7

OPERATION

FAST ACCESS TIME: 45ns

LOW POWER CONSUMPTION:

– Active Current 30mA at 5MHz

– Standby Current 100 A

PROGRAMMING VOLTAGE: 12.75V 0.25V

PROGRAMMING TIME: 100 s/byte

(PRESTO II ALGORITHM)

ELECTRONIC SIGNATURE

– Manufacturer Code: 20h

– Device Code: 8Dh

10% SUPPLY VOLTAGE in READ

Address Inputs

Data Outputs

Chip Enable

Output Enable

Program Supply

Supply Voltage

Ground

256 Kbit (32Kb x 8) UV EPROM and OTP EPROM

Figure 1. Logic Diagram

A0-A14

FDIP28W (F)

PLCC32 (C)

V CC

M27C256B

V SS

V PP

M27C256B

TSOP28 (N)

PDIP28 (B)

8 x 13.4mn

Q0-Q7

AI00755B

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