54ACT16821, 74ACT16821 20-BIT BUS-INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS

SCAS176A - JANUARY 1991 - REVISED APRIL 1996

features

Members of the Texas Instruments Widebus^TM Family
Inputs Are TTL-Voltage Compatible
Provide Extra Data Width Necessary for Wider Address/Data Paths or Buses With Parity
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
Package Options Include 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

These 20-bit flip-flops feature 3-state outputs designedspecifically for driving highly-capacitive or relativelylow-impedance loads. They are particularly suitable for implementingwider buffer registers, I/O ports, parity bus interfacing, andworking registers.

The 'ACT16821 can be used as two 10-bit flip-flops or one 20-bitflip-flop. On the positive transition of the clock (CLK) input, the Qoutputs follow the data (D) inputs. Each 10-bit flip-flop section hasa buffered output-enable (1 or2) input thatcan be used to place the ten outputs in either a normal logic state(high or low logic levels) or the high-impedance state. In thehigh-impedance state, the outputs neither load nor drive the buslines significantly.

does notaffect the internal operation of the flip-flops. Old data can beretained or new data can be entered while the outputs are in thehigh-impedance state.

The 74ACT16821 is packaged in theTI 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 54ACT16821 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. The74ACT16821 is characterized for operation from -40°C to85°C.

Title: 20-BIT BUS INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS
Product Family: D-TYPE (3-STATE) FLIP-FLOPS
Device Functionality: 20-BIT BUS-INTERFACE FLIP-FLOP
Orderable Devices: 74ACT16821DL, 74ACT16821DLR

View the complete PDF datasheet: scas176a.pdf (116 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:74ACT16821

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