■ 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.