TC74HC299AP/AF

2007-10-01

1

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic

8-Bit PIPO Shift Register with Asynchronous Clear

The TC74HC299A is a high speed CMOS 8-BIT PIPO SHIFT

It achieves the high speed operation similar to equivalent

LSTTL while maintaining the CMOS low power dissipation.

It has four modes (HOLD, SHIFT LEFT, SHIFT RIGHT and

LOAD DATA) controlled by the two selection inputs (S0, S1).

When one or both enable ( 1

G , 2

G ) are high, the eight I/O

outputs are forced to the high-impedance state; however,

sequential operation or clearing of the register is not affected.

All inputs are equipped with protection circuits against static

discharge or transient excess voltage.

Features (Note 1) (Note 2)

• Outputs drive capability

: 15 LSTTL loads for QA to QH

10 LSTTL loads for QA’, QH’

• Symmetrical output impedance

• Pin and function compatible with 74LS299

Note 1: Do not apply a signal to any bus terminal when it is in the output mode. Damage may result.

Note 2: All floating (high impedance) bus terminals must have their input levels fixed by means of pull up or pull

down resistors.

Pin Assignment

TC74HC299AP

TC74HC299AF

Weight

DlP20-P-300-2.54A

: 1.30 g (typ.)

SOP20-P-300-1.27A

: 0.22 g (typ.)