Octal Transceiver With Parity Generator/Checker And 3-State Outputs

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. When transmitting from A port to B port (T/R high), PARITY is an output from the generator/checker. When receiving from B port to A port (T/R low), PARITY is an input.
When transmitting (T/R high), the parity select (ODD/EVEN) input is made high or low as appropriate. The A port is then polled to determine the number of high bits.The PARITY output goes to the Logic state determined by ODD/EVEN and the number of high bits on A port. When ODD/EVEN is low (for even parity) and the number of high bits on A port is odd, the PARITY will be high, transmitting even parity. If the number of high bits on A port is even, the PARITY will be low, keeping even parity.
When in the receive mode (T/R low), the B port is polled to determine the number of high bits. If ODD/EVEN is low (for even parity) and the number of highs on B port is: 1. Odd and the PARITY input is high, then ERR will be high signifying no error. 2. Even and the PARITY input is high, then ERR will be low indicating an error.
The SN74F657 is characterized for operation from 0?C to 70?C.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN74F657NTE4 Texas Instruments Octal Transceiver With Parity Generator/Checker and 3-State Outputs 24-PDIP 0 to 70
SN74F657NT Texas Instruments Octal Transceiver With Parity Generator/Checker and 3-State Outputs 24-PDIP 0 to 70
SN74F657DWR Texas Instruments F/FAST SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, PLASTIC, SOIC-24
SN74F657DWG4 Texas Instruments F/FAST SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, PLASTIC, SOIC-24
SN74F657DWE4 Texas Instruments F/FAST SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, PLASTIC, SOIC-24
SN74F657DW Texas Instruments Octal Transceiver With Parity Generator/Checker and 3-State Outputs 24-SOIC 0 to 70
SN74F657DWRG4 Texas Instruments F/FAST SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, PLASTIC, SOIC-24
SN74F657DWRE4 Texas Instruments F/FAST SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, PLASTIC, SOIC-24
SN74F657 's PackagesSN74F657 's pdf datasheet
SN74F657DW SOIC
SN74F657DWE4 SOIC
SN74F657DWG4 SOIC
SN74F657DWR SOIC
SN74F657DWRE4 SOIC
SN74F657DWRG4 SOIC
SN74F657NT PDIP
SN74F657NTE4 PDIP




SN74F657 Pinout, Pinouts
SN74F657 pinout,Pin out
This is one package pinout of SN74F657,If you need more pinouts please download SN74F657's pdf datasheet.

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