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Members of the Texas Instruments

WidebusE Family

State-of-the-Art EPIC-IIBE 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 VOLP (Output Ground Bounce) < 1 V

at VCC = 5 V, TA = 25°C

High-Impedance State During Power Up

and Power Down

Distributed VCC and GND Pin Configuration

Minimizes High-Speed Switching Noise

Flow-Through Architecture Optimizes PCB

Layout

High-Drive Outputs (–32-mA IOH, 64-mA IOL)

Bus Hold on Data Inputs Eliminates the

Need for External Pullup/Pulldown

Resistors

Package Options Include Plastic 300-mil

Shrink Small-Outline (DL) and Thin Shrink

Small-Outline (DGG) Packages and 380-mil

Fine-Pitch Ceramic Flat (WD) Package

Using 25-mil Center-to-Center Spacings

description

These 18-bit flip-flops feature 3-state outputs

designed specifically for driving highly capacitive

or relatively low-impedance loads. They are

particularly suitable for implementing wider buffer

registers, I/O ports, bidirectional bus drivers with

parity, and working registers.

The ’ABTH16823 can be used as two 9-bit flip-flops or one 18-bit flip-flop. With the clock-enable (CLKEN) input

low, the D-type flip-flops enter data on the low-to-high transitions of the clock. Taking CLKEN high disables the

clock buffer, latching the outputs. Taking the clear (CLR) input low causes the Q outputs to go low independently

of the clock.

A buffered output-enable (OE) input can be used to place the nine outputs in either a normal logic state (high

or low logic levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive

the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines

without need for interface or pullup components.

OE does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered

while the outputs are in the high-impedance state.