SN54ABT16646, SN74ABT16646 16-BIT BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCBS212B - JUNE 1992 - REVISED JANUARY 1997

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features

Members of the Texas Instruments Widebus^TM Family
State-of-the-Art EPIC-IIB^TM BiCMOS Design Significantly Reduces Power Dissipation
Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD-17
Typical V_OLP (Output Ground Bounce) < 1 V at V_CC = 5 V, T_A = 25°C
Distributed V_CC and GND Pin Configuration Minimizes High-Speed Switching Noise
Flow-Through Architecture Optimizes PCB Layout
High-Drive Outputs (-32-mA I_OH, 64-mA I_OL)
Package Options Include Plastic 300-mil Shrink Small-Outline (DL) Packages and 380-mil Fine-Pitch Ceramic Flat (WD) Package Using 25-mil Center-to-Center Spacings

Widebus and EPIC-IIB are trademarks of Texas Instruments

description

The 'ABT16646 consist of bus-transceiver circuits, D-typeflip-flops, and control circuitry arranged for multiplexedtransmission of data directly from the input bus or from the internalregisters.

These devices can be used as two 8-bit transceivers or one 16-bittransceiver. Data on the A or B bus is clocked into the registers onthe low-to-high transition of the appropriate clock (CLKAB or CLKBA)input. Figure 1 illustrates the four fundamental bus-managementfunctions that can be performed with the 'ABT16646.

Output-enable () anddirection-control (DIR) inputs are provided to control thetransceiver functions. In the transceiver mode, data present at thehigh-impedance port may be stored in either register or in both. Theselect-control (SAB and SBA) inputs can multiplex stored andreal-time (transparent mode) data. The circuitry used for selectcontrol eliminates the typical decoding glitch that occurs in amultiplexer during the transition between stored and real-time data.The direction control (DIR) determines which bus receives data when is low. In theisolation mode ( high), A datacan be stored in one register and/or B data can be stored in theother register.

When an output function is disabled, the input function is stillenabled and can be used to store and transmit data. Only one of thetwo buses, A or B, can be driven at a time.

To ensure the high-impedance state during power up or power down, should be tiedto V_CC through a pullup resistor; the minimum value of theresistor is determined by the current-sinking capability of thedriver.

The SN54ABT16646 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ABT16646 is characterized for operation from -40°C to85°C.

Title: 16-BIT BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
Product Family: REGISTERED TRANSCEIVERS
Device Functionality: 16-BIT REGISTERED TRANSCEIVER
Orderable Devices: SNJ54ABT16646WD, SN74ABT16646DL, SN74ABT16646DLR

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View more information about generic part numbers:SN54ABT16646, SN74ABT16646

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