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The logic interface module is a monolithic device designed to allow the exchange of data between two logic subsystems of equipment boxes, such as data terminal equipment or data communication equipment.
English (United States)
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Logic Interface Module
The logic interface module is a monolithic device designed to allow the
exchange of data between two logic subsystems of equipment boxes, such as
data terminal equipment or data communication equipment.
The module comprises four identical logic interfaces D1 to D4 with a common
bias circuit 1 and a common impedance control circuit 2.
Interfaces D1 to D4 are constructed with differential inputs to allow matching
with almost any type of logic. An impedance control circuit is provided to allow
The bias circuit 1 provides the + input reference of the interfaces, this input
having a level against which binary signals on - input will be discriminated as
zeroes or ones. In normal operation with transistor-transistor logic (TTL) this
voltage is approximately 1.5 volts. By raising this reference above +5 volts or
lowering it under 0 volt, the interfaces are forced to provide a positive or a
negative signal at the output whatever the states of the input bits.
The 1.5-volt level is obtained by diodes D1 to D4 and resistor R1. These
diodes are also used to shift a TTL signal above 5 volts or below 0 volt.
Impedance control circuit 2 has a dual purpose. When it is turned off, it
maintains the interface outputs in a high impedance state so that the interfaces
are unable to deliver or receive any current at their outputs. When circuit 2 is
turned on, it provides the interfaces with polarization currents that control all the