SN54ABT16821, SN74ABT16821 20-BIT BUS-INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS

SCBS216B - 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
ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
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 Thin Shrink Small-Outline (DGG), 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 Incorporated.

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, bidirectional bus drivers withparity, and working registers.

The 'ABT16821 can be used as two 10-bit flip-flops or one 20-bitflip-flop. The 20 flip-flops are edge-triggered D-type flip-flops. Onthe positive transition of the clock (CLK) input, the device providestrue data at the Q outputs.

A buffered output-enable () input can be used to place the ten outputs in either anormal logic state (high or low logic level) or a high-impedancestate. In the high-impedance state, the outputs neither load nordrive the bus lines significantly. The high-impedance state andincreased drive provide the capability to drive bus lines withoutneed for interface or pullup components.

does not affectthe internal operation of the flip-flops. Old data can be retained ornew data can be entered while the outputs are in the high-impedancestate.

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 SN54ABT16821 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ABT16821 is characterized for operation from -40°C to85°C.

Title: 20-BIT BUS-INTERFACE FLIP-PLOPS WITH 3-STATE OUTPUTS
Product Family: D-TYPE (3-STATE) FLIP-FLOPS
Device Functionality: 20-BIT BUS INTERFACE FLIP-FLOP
Orderable Devices: SN74ABT16821DGGR, SN74ABT16821DL, SN74ABT16821DLR

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View more information about generic part numbers:SN74ABT16821

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