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Describes a new family of logic compatible optically coupled isolators. The family of logic-to-logic compatible optically coupled isolators from General Instruments, Optologic, consists of logic elements with LSTTL-in to TTL or CMOS outputs. Each device eliminates the concern for resistor selection, with guaranteed DC parameters and switching speed over temperature. This ease of operation is made possible through the use of an input amplifier that provides the interface between the driving LSTTL gate and the LED emitter. The output circuitry consists of a multistage high speed amplifier available with either a totem pole or open collector output. The input amplifier, LED and output amplifier is assembled in an industry-standard six pin package. The Optologic devices not only provide isolated logic-to-logic interface functions, but due to many features of the input amplifier, offer solutions for high speed data communications and precise DC level sensing.