54ABT16646 Datasheet | National Semiconductor

54ABT16646 16-Bit Transceivers and Registers with TRI-STATE Outputs July 1998 54ABT16646 16-Bit Transceivers and Registers with TRI-STATE ® Outputs General Description The ’ABT16646 consists of bus transceiver circuits with TRI-STATE, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes to a high logic level. Control OE and direction pins are provided to control the transceiver function. In the transceiver mode, data present at the high impedance port may be stored in either the A or the B register or in both. The select controls can multiplex stored and real-time (transparent mode) data. The direction control determines which bus will receive data when the enable control OE is Active LOW. In the isolation mode (control OE HIGH), A data may be stored in the B register and/or B data may be stored in the A register. Features n Independent registers for A and B buses n Multiplexed real-time and stored data n A and B output sink capability of 48 m A, source capability of 24 m A n Guaranteed latchup protection n High impedance glitch free bus loading during entire power up and power down cycle n Nondestructive hot insertion capability n Standard Microcircuit Drawing (SMD) 5962-9450202 Ordering Code Military 54ABT16646W-QML Package Number WA56A 56-Lead Cerpack Pin Names A0- A15 B0- B15 CPABn, CPBAn SABn, SBAn OEn DIR DS100226-1 Package Description Logic Symbol Description Data Register A Inputs/ TRI-STATE Outputs Data Register B Inputs/ TRI-STATE Outputs Clock Pulse Inputs Select Inputs Output Enable Input Direction Control Input TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100226 .national. Print Date=1998/07/14 Print Time=11:10:43 43606 ds100226 Rev. No. 1 cmserv Proof Connection...