74ABT16646

74ABT16646 16-Bit Transceivers and Registers with 3-STATE Outputs

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74ABT16646 16-Bit Transceivers and Registers with 3-STATE Outputs

October 1993 Revised November 1999

74ABT16646 16-Bit Transceivers and Registers with 3-STATE Outputs
General Description
The ABT16646 consists of bus transceiver circuits with 3STATE, 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
s Independent registers for A and B buses s Multiplexed real-time and stored data s A and B output sink capability of 64 mA, source capability of 32 mA s Guaranteed latchup protection s High impedance glitch free bus loading during entire power up and power down cycle s Nondestructive hot insertion capability

Ordering Code:
Order Number 74ABT16646CSSC 74ABT16646CMTD Package Number MS56A MTD56 Package Description 56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Devices also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.

Logic Symbol

Connection Diagram

Pin Descriptions
Pin Names A0 A15 Description Data Register A Inputs/ 3-STATE Outputs B0 B15 Data Register B Inputs/ 3-STATE Outputs CPABn, CPBAn SABn, SBAn OEn DIR Clock Pulse Inputs Select Inputs Output Enable Input Direction Control Input

1999 Fairchild Semiconductor Corporation

DS011644

www.fairchildsemi.com