■ FAST ACCESS TIME: 150ns

■0 to +70°C STANDARD TEMPERATURE

RANGE

SINGLE +5V POWER SUPPLY

+10 VCC TOLERANCE AVAILABLE

■LOW STANDBY CURRENT (40mA MAX)

■ TTL COMPATIBLE DURING READ AND

PROGRAM

■FAST PROGRAMMING ALGORITHM

ELECTRONIC SIGNATURE

DESCRIPTION

The ST27128AP is a 131,072-bit one time program-

mable read only memory (OTPROM). It is orga-

nized as 16,384 words by 8 bits and manufactured

using SGS-THOMSON' NMOS-E3 process.

The ST27128AP with its single +5V power sup-

ply and with an access time of 200ns, is ideal for

use with high performance +5V microprocessor

such as Z8, Z80 and Z8000. The ST27128AP has

an important feature which is to separate the out-

put control, Ouptut Enable (OE) from the Chip Ena-

ble control (CE). The OE control eliminates bus

contention in multiple bus microprocessor systems.

The ST27128AP also features a standby mode

which reduces the power dissipation without increa-

sing access time. The active current is 85mA whi-

le the maximum standby current is only 40mA, a

53 saving. The standby mode is achieved by ap-

plying a TTL-high signal to the CE input. The

ST27128AP has an Electronic Signature that al-

lows programmers to automatically identify devi-

ce type and pinout. The ST27128AP is available

in a 28-lead dual in-line plastic package and the-

refore cannot be rewritten.