Description

OPTOLOGIC™ is the first family of truly logic compatible optically coupled logic interface gates.

The family consists of four device types offering LSTTL to TTL and LSTTL to CMOS interfacing. Each of these interfacing functions is available as a buffer (A = B), or as an inverter (A = B).

The LSTTL input compatibility is provided by an input integrated circuit, with industry standard logic levels. This input amplifier IC switches a temperature compensated current source driving a high speed 850nm AlGaAs LED emitter. This novel integration scheme eliminates CTR degradation over time and temperature.

The emitter is optically coupled to an integrated photodetector/high-gain, high-speed output amplifier IC. The superior 15kV/µS common-mode noise rejection is ensured through the use of an optically transparent noise shield.

The TTL compatible output has a totem-pole with a fan-out of 10. The CMOS compatible output has an open collector Schottky-clamped transistor that interfaces to any CMOS logic between 4.5 and 15 volts. The 74OL6010/11 may also by used to drive power MOSFETs or transistors up to 15 volts.

The Optologic coupler family typically offers propagation of delays of 60 ns and can support 15 MBaud data communication.

Features

■ Industry first LSTTL to TTL and LSTTL to CMOS

complete logic-to-logic optocoupler

■ Incorporates LED drive circuitry — use as a logic gate

■ Very high speed

■ Choice of buffer or inverter

■ Choice of TTL or CMOS compatible output up to 15 volts

■ Fan-out of 10 TTL loads, fan-in 1 LSTTL load

■ Internal noise shield — very high CMR of ±15kV/µS

■ UL recognized (File #E90700)

■ Same noise immunity as LSTTL/TTL.

Applications

■ Transmission line interface — receiver and driver

■ Excellent as bridged receiver in fast LAN highways

■ Bus interface

■ Logic family interface with ground loop noise

elimination

■ High speed AC/DC voltage sensing

■ Driver for power semiconductor devices

■ Level shifting

■ Replaces fast pulse transformers