54AC16646, 74AC16646 16-BIT BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCAS241A - MARCH 1990 - REVISED APRIL 1996

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features

Members of the Texas Instruments Widebus^TM Family
Independent Registers for A and B Buses
Multiplexed Real-Time and Stored Data
Flow-Through Architecture Optimizes PCB Layout
Distributed V_CC and GND Pin Configurations Minimize High-Speed Switching Noise
EPIC^TM (Enhanced-Performance Implanted CMOS) 1-m Process
500-mA Typical Latch-Up Immunity at 125°C
Package Options Include Plastic 300-mil Shrink Small-Outline (DL) Packages Using 25-mil Center-to-Center Pin Spacings and 380-mil Fine-Pitch Ceramic Flat (WD) Packages Using 25-mil Center-to-Center Pin Spacings

EPIC and Widebus are trademarks of Texas Instruments

description

The 'AC16646 are 16-bit bus transceivers that consist of D-typeflip-flops and control circuitry, with 3-state outputs arranged formultiplexed transmission of data directly from the data bus or fromthe internal storage registers. The devices can be used as two 8-bittransceivers or one 16-bit transceiver. Data on the A or B bus isclocked into the registers on the low-to-high transition of theappropriate clock (CLKAB or CLKBA) input. Figure 1 illustrates thefour fundamental bus-management functions that can be performed withthe bus transceivers and registers.

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 controls (SAB and SBA) can multiplex stored and real-time(transparent mode) data. The circuitry used for select controleliminates the typical decoding glitch that occurs in a multiplexerduring the transition between stored and real-time data. DIRdetermines which bus receives data when is active (low). In the isolationmode ( high), A datamay be stored in one register and/or B data may be stored in theother register.

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

The 74AC16646 is packaged in the TI shrink small-outline package,which provides twice the functionality of standard small-outlinepackages in the same printed-circuit-board area.

The 54AC16646 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. The 74AC16646is characterized for operation from -40°C to 85°C.

Title: 16-BIT BUS TRANSCEIVERS AND RECEIVERS WITH 3-STATE OUTPUTS
Product Family: REGISTERED TRANSCEIVERS
Device Functionality: 16-BIT BUS TRANSCEIVER/REGISTER
Orderable Devices: 74AC16646DL

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