Skew compensated RS422 buffer
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United States of America Patent
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-
Sep 19, 1989
Grant Date -
N/A
app pub date -
Dec 7, 1987
filing date -
Dec 7, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A skew compensated RS422 buffer includes a skew compensation circuit and an output driver. The output driver is connected to receive a complementary pair of compensated drive signals, and provides complementary buffer output signals in response thereto. Due to asymmetric switching characteristics, buffer output signals in response to falling edge drive signals are delayed by an inherent skew period with respect to buffer output signals in response to rising edge drive signals. The skew compensation circuit includes a NOR gate and an AND gate, both of which have a first input terminal connected to receive buffer input signals. The buffer input signals are also applied to second input terminals of both the NOR gate and AND gate through delay gates which delay signal propagation by delay periods substantially equal to the inherent skew period of the output driver. A complementary pair of compensated drive signals are provided at output terminals of the NOR and AND gates, thereby compensating for the asymmetric switching characteristics of the output driver means.
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