SN74BCT29854 8-Bit To 9-Bit Parity Transceivers |

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8-Bit To 9-Bit Parity Transceivers

8-Bit To 9-Bit Parity Transceivers - SN74BCT29854


The SN74BCT29854 is an 8-bit to 9-bit parity transceiver designed for asynchronous communication between data buses. When data is transmitted from the A to B bus, a parity bit is generated. When data is transmitted from the B to A bus with its corresponding parity bit, the parity-error () output will indicate whether or not an error in the B data has occurred. The output-enable (, ) inputs can be used to disable the device so that the buses are effectively isolated.

A 9-bit parity generator/checker generates a parity-odd (PARITY) output and monitors the parity of the I/O ports with an open-collector parity-error () flag. can be either passed, sampled, stored, or cleared from the latch using the latch-enable () and clear () control inputs. When both and are low, data is transferred from the A bus to the B bus and inverted parity is generated. Inverted parity is a forced error condition which gives the designer more system diagnostic capability. The SN74BCT29854 provides inverting logic.

The SN74BCT29854 is characterized for operation from 0°C to 70°C.



  • BiCMOS Process With TTL Inputs and Outputs
  • State-of-the-Art BiCMOS Design Significantly Reduces Standby Current
  • Flow-Through Pinout (All Inputs on Opposite Side From Outputs)
  • Functionally Equivalent to AMD Am29854
  • High-Speed Bus Transceiver With Parity Generator/Checker
  • Parity-Error Flag With Open-Collector Output
  • Latch for Storage of the Parity-Error Flag
  • Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic 300-mil DIPs (NT)


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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Bits (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) IOL (Max) (mA) IOH (Max) (mA) Operating temperature range (C) Package Group
SN74BCT29854 Order now BCT     4.5     5.5     9     5     70     0.08     8     48     -24     0 to 70     SOIC | 24