SN54ACT16651, 74ACT16651 16-BIT TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCAS449A - FEBRUARY 1993 - REVISED APRIL 1996

features

Members of the Texas Instruments Widebus^TM Family
Inputs Are TTL-Voltage Compatible
Inverting Data Paths
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 Configurations Minimize High-Speed Switching Noise
EPIC^TM (Enhanced-Performance Implanted CMOS) 1-m Process
500-mA Typical Latch-Up Immunity at 125°C
Packaged in Plastic 300-mil Shrink Small-Outline (DL) Packages 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 SN54ACT16651 and 74ACT16651 are 16-bit bus transceivers thatconsist of D-type flip-flops and control circuitry arranged formultiplexed transmission of data directly from the data bus or fromthe internal storage registers. These devices can be used as two8-bit transceivers or 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 SN54ACT16651 and 74ACT16651.

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 74ACT16651 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 SN54ACT16651 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. The74ACT16651 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: 74ACT16651DL, 74ACT16651DLR

View the complete PDF datasheet: scas449a.pdf (165 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:74ACT16651

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.