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Octal Registered Transceiver With 3-State Outputs


Package | PIN: DW | 24
Temp: C (0 to 70)
Carrier: Cut Tape
Qty Price
1-9 $1.18
10-24 $1.06
25-99 $0.98
100-249 $0.83
250-499 $0.77
500-749 $0.63
750-999 $0.50
1000+ $0.45


  • 3-State True Outputs
  • Back-to-Back Registers for Storage
  • Package Options Include Plastic Small-Outline and Shrink Small-Outline Packages and Standard Plastic 300-mil DIPs


Texas Instruments  SN74F543DWR

The SN74F543 octal transceiver contains two sets of D-type latches for temporary storage of data flowing in either direction. Separate latch-enable ( or ) and output enable ( or ) inputs are provided for each register to permit independent control in either direction of data flow. The A outputs are characterized to sink 24 mA while the B outputs are characterized to sink 64 mA.

The A-to-B enable () input must be low in order to enter data from A or to output data from B. Having low and low makes the A-to-B latches transparent; a subsequent low-to-high transition of puts the A latches in the storage mode. With and both low, the 3-state B outputs are active and reflect the data present at the output of the A latches. Data flow from B to A is similar, but requires using the , , and inputs.

The SN74F543 is available in TI's shrink small-outline package (DB), which provides the same I/O pin count and functionality of standard small-outline packages in less than half the printed-circuit-board area.

The SN74F543 is characterized for operation from 0°C to 70°C.



A-to-B data flow is shown; B-to-A flow control is the same except that it uses , , and .

Output level before the indicated steady-state input conditions were established.