M54/74HC299

M54/74HC323

October 1993

HC323 8 BIT PIPO SHIFT REGISTER WITH SYNCHRONOUS CLEAR

HC299 8 BIT PIPO SHIFT REGISTER WITHASYNCHRONOUS CLEAR

B1R

(Plastic Package)

ORDER CODES :

M54HCXXXF1R

M74HCXXXM1R

M74HCXXXB1R

M74HCXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

.

HIGH SPEED

.

LOW POWER DISSIPATION

.

HIGH NOISE IMMUNITY

.

OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS FOR QA’ TO QH’

15 LSTTL LOADS FOR QA TO QH

.

SYMMETRICAL OUTPUT IMPEDANCE

.

BALANCED PROPAGATION DELAYS

.

WIDE OPERATING VOLTAGE RANGE

.

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS299

DESCRIPTION

The M54/74HC299/323 are high speed CMOS 8-

BIT PIPO SHIFT REGISTERS (3-STATE) fabri-

cated with silicon gate C

They achieve the high speed operation similar to

equivalent LSTTL while maintaining the CMOS low

power consumption.

These devices have four modes (HOLD, SHIFT

LEFT, SHIFT RIGHT and LOAD DATA). Each mode

is chosen by two function select inputs (S0, S1).

When one or both enable inputs, (G1, G2) are high,

the eight input/output terminals are in the high-

impedance state ; however sequential operation or

clearing of the register is not affected.

Clear function on the HC299 is asynchronous to

CLOCK, while the HC323 is cleared synchronous to

clock.

All inputs are equipped with protection circuits

against static discharge and transient excess volt-

age.

1/15