SN74ABT543A

Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Input voltage range, VI (except I/O ports) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..0.5 V to 7 V
Voltage range applied to any output in the high state or power-off state, VO . . . . . . . . . . ..0.5 V to 5.5 V
Current into any output in the low state, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 mA
Output clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 mA
Maximum power dissipation at TA = 55°C (in still air): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 W
                                                                                      DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . ..1 W
                                                                                      NT package . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3 W
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65°C to 150°C

The SN74ABT543A octal transceiver contains two sets of D-type latches for temporary storage of data flowing in either direction. Separate latch-enable (LEAB or LEBA) and output-enable (OEAB or OEBA) inputs are provided for each register to permit independent control in either direction of data flow.

The A-to-B enable (CEAB ) input of SN74ABT543A must be low in order to enter data from A or to output data from B. If CEAB is low andLEAB is low, the A-to-B latches are transparent; a subsequent low-to-high transition ofLEAB puts the A latches in the storage mode. With CEABand OEAB 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 CEBA, LEBA, and OEBA inputs.

To ensure the high-impedance state of SN74ABT543A during power up or power down, OEshould be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN74ABT543A is packaged 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 SN74ABT543A is characterized for operation from 40°C to 85°C.