HD74ALVCH16543

HD74ALVCH16543 16-bit Registered Transceivers with 3-state Outputs ADE-205-169A (Z) 2nd. Edition December 1999 Description The HD74ALVCH16543 can be used as two 8-bit transceivers or one 16-bit transceiver. 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 must be low in order to enter data from A or to output data from B. If CEAB is low and LEAB is low, the A to B latches are transparent; a subsequent low to high transition of LEAB puts the A latches in the storage mode. With CEAB and 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 CEBA , LEBA, and OEBA. Active bus hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Features VCC = 2.3 V to 3.6 V Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C) Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C) High output current ±24 mA (@V CC = 3.0 V) Bus hold on data inputs eliminates the need for external pullup / pulldown resistors HD74ALVCH16543 Function Table *1 Inputs CEAB H X L L L LEAB X X H L L OEAB X H L L L A X X X L H Z Z B0 L H *2 Output B H : High level L : Low level X : Immaterial Z : High impedance Notes 1. A to B data flow is shown; B to A flow control is the same except that it uses CEBA , L...