1 Features

• LSTTL input logic compatible

– VIL(max) = 0.8 V, VIH(min) = 2 V

• CMOS input logic compatible

– II ≤ 1 μA at VOL, VOH

• Buffered inputs

• 4.5 V to 5.5 V operation

• Wide operating temperature range:

–55°C to +125°C

• Supports fanout up to 10 LSTTL loads

• Significant power reduction compared to LSTTL

logic ICs

2 Applications

• Alarm / tamper detect circuit

• S-R latch

3 Description

This device contains four independent 2-input NOR

gates. Each gate performs the Boolean function

Y = A + B in positive logic.