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SN74F657,pdf(Octal Transceiver
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The SN74F657 contains eight noninverting buffers with 3-state outputs and an 8-bit parity generator/checker. It is intended for bus-oriented applications. The buffers have a specified current sinking capability of 24 mA at the A port and 64 mA at the B port.
The transmit/receive (T/R\) input determines the direction of the data flow through the bidirectional transceivers. When T/R\ is high, data is transmitted from the A port to the B port. When T/R\ is low, data is received at the A port from the B port.
When the output enable (
) input is high, both the A and B ports are placed in a high-impedance state (disabled). The ODD/EVEN\ input allows the user to select between odd or even parity systems.
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