54ACT16652, 74ACT16652 16-BIT TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCAS128C - MARCH 1990 - REVISED APRIL 1996

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features

Members of the Texas Instruments Widebus^TM Family
Inputs Are TTL-Voltage Compatible
Independent Registers and Enables for A and B Buses
Multiplexed Real-Time and Stored Data
Flow-Through Architecture Optimizes PCB Layout
Distributed V_CC and GND Pin Configuration Minimizes 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 Spacings

EPIC and Widebus are trademarks of Texas Instruments

description

The 'ACT16652 are 16-bit bus transceivers consisting of D-typeflip-flops and control circuitry arranged for multiplexedtransmission of data directly from the data bus or from the internalstorage registers. The devices can be used as two 8-bit transceiversor one 16-bit transceiver.

Complementary output-enable (OEAB and ) inputs are provided to controlthe transceiver functions. Select-control (SAB and SBA) inputs areprovided to select whether real-time or stored data is transferred. Alow input level selects real-time data, and a high input levelselects stored data. The circuitry used for select control eliminatesthe typical decoding glitch that occurs in a multiplexer during thetransition between stored and real-time data. Figure 1 illustratesthe four fundamental bus-management functions that can be performedwith the 'ACT16652.

Data on the A or B bus, or both, can be stored in the internal Dflip-flops by low-to-high transitions at the appropriate clock (CLKABor CLKBA) inputs, regardless of the levels on the select-control oroutput-enable inputs. When SAB and SBA are in the real-time transfermode, it is also possible to store data without using the internalD-type flip-flops by simultaneously enabling OEAB and. In this configuration, eachoutput reinforces its input. Thus, when all other data sources to thetwo sets of bus lines are at high impedance, each set of bus linesremains at its last state.

The 74ACT16652 is packaged in TI's shrink small-outline package,which provides twice the I/O pin count and functionality of standardsmall-outline packages in the same printed-circuit-board area.

The 54ACT16652 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. The74ACT16652 is characterized for operation from -40°C to85°C.

Title: 16-BIT TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
Product Family: REGISTERED TRANSCEIVERS
Device Functionality: 16-BIT TRANSCEIVER/REGISTER
Orderable Devices: 74ACT16652DL, 74ACT16652DLR

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View more information about generic part numbers:74ACT16652

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