74F657 Octal Transceiver With 8-bit Parity Generator/checker

The 74F657 is an octal transceiver featuring non-inverting Buffers with 3-state outputs and an 8-bit parity generator/checker, and is intended for bus-oriented applications. The Buffers have a guaranteed current sinking capability of 24 mA at the A ports and 64 mA at the B ports. The transmit/receive (T/R) input determines the direction of the data flow through the bidirectional transceivers. Transmit (active HIGH) enables data from A ports to B ports; receive (active LOW) enables data from B ports to A ports. The output enable (OE) input disables both the A and B ports by placing them in a high impedance condition when the OE input is HIGH. The parity select (ODD/EVEN) input gives the user the option of odd or even parity systems. The parity (PARITY) pin is an output from the generator/checker when transmitting from the port A to B (T/R = HIGH) and an input when receiving from port B to A port ( T/R = LOW). When transmitting (T/R = HIGH) the parity select (ODD/EVEN) input is set, then the A port data is polled to determined the number of high bits. The parity (PARITY) output then goes to the Logic state determined by the parity select (ODD/EVEN) setting and by the number of high bits on port A. For example, if the parity select (ODD/EVEN) is set LOW (even parity), and the number of high bits on port A is odd, then the parity (PARITY) output will be HIGH, transmitting even parity. If the number of high bits on port A is even, then the parity (PARITY) output will be LOW, keeping even parity. When in receive mode (T/R = LOW) the B port is polled to determine the number of high bits. If parity select (ODD/EVEN) is LOW (even parity) and the number of highs on port B is: (1) odd and the parity (PARITY) input is HIGH, then ERROR will be HIGH, significantly no error. (2) even and the parity (PARITY) input is HIGH, then ERROR will be asserted LOW, indicating an error.
By NXP Semiconductors
Part Manufacturer Description Datasheet Samples
74F657SDC Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, CDIP24, 0.300 INCH, SLIM, CERAMIC, DIP-24
74F657VC Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, PDSO24, SOIC-24
74F657VCQR Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, PDSO24, SOIC-24
74F657SC Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, PDSO24, 0.150 INCH, SOIC-24
74F657SDCQR Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, CDIP24, 0.300 INCH, SLIM, CERAMIC, DIP-24
74F657SPC Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, PDIP24, 0.300 INCH, PLASTIC, MS-001, DIP-24
74F657SPCQR Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, PDIP24, 0.300 INCH, SLIM, PLASTIC, DIP-24
MC74F657BN Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, PDIP24, 724-03
MC74F657AJ Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, CDIP24, 758-01
MC74F657BJ Rochester Electronics LLC Bus Transceiver, F/FAST Series, 1-Func, 8-Bit, True Output, TTL, CDIP24, 758-01
74F657 's Packages74F657 's pdf datasheet



74F657 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
74F657 circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

Related Electronics Part Number

Related Keywords:

74F657 Pb-Free 74F657 Cross Reference 74F657 Schematic 74F657 Distributor
74F657 Application Notes 74F657 RoHS 74F657 Circuits 74F657 footprint
Hot categories