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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

SN54LVTH162374, SN74LVTH162374

3.3-V ABT 16-BIT EDGE-TRIGGERED D-TYPE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SCBS262L – JULY 1993 – REVISED OCTOBER 2005

The 'LVTH162374 devices are 16-bit edge-triggered D-type flip-flops with 3-state outputs designed for

They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working

registers.

These devices can be used as two 8-bit flip-flops or one 16-bit flip-flop. On the positive transition of the clock

(CLK), the Q outputs of the flip-flop take on the logic levels set up at the D inputs.

A buffered output-enable (OE) input can be used to place the eight 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 the increased drive provide the capability to drive bus lines

without need for interface or pullup components.

OE does not affect internal operations of the flip-flop. Old data can be retained or new data can be entered while

the outputs are in the high-impedance state.

The outputs, which are designed to source or sink up to 12 mA, include equivalent 22-

Ω series resistors to

reduce overshoot and undershoot.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors

with the bus-hold circuitry is not recommended.

the minimum value of the resistor is determined by the current-sinking capability of the driver.

disables the outputs, preventing damaging current backflow through the devices when they are powered down.

The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,

which prevents driver conflict.

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