These circuits are TTL-compatible, high-speed line receivers. Each is a monolithic twin circuit with two separate channels. They are intended for both general use and specific applications such as data comparators, balanced, unbalanced, and party-line transmission systems. These devices are unilaterally interchangeable with and replacements for the SN55107, SN75107, and SN75108, but they include diode-clamped strobe inputs to facilitate circuit design. The schematics show the main difference between the A and B variants. Input-protection diodes are connected in series to the collectors of the differential-input transistors in the B versions. These diodes are useful in certain party-line systems that have several VCC+ power supply and can function with some of them turned off.
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