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
f
MAX
= 42 MHz (TYP.) AT V
CC
= 5V
.
LOW POWER DISSIPATION
I
CC
= 4
A (MAX.) AT T
A
= 25
C
.
HIGH NOISE IMMUNITY
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS FOR QA' TO QH'
15 LSTTL LOADS FOR QA TO QH
.
SYMMETRICAL OUTPUT IMPEDANCE
I
OH
= I
OL
= 6 mA (MIN.) FOR Q
A
, TO Q
H
,
I
OH
= I
OL
= 4 mA (MIN.) FOR Q
A
, TO Q
H
.
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
.
WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V TO 6 V
.
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
2
MOS technology.
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
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
MODE
INPUTS
INPUTS/OUTPUTS
OUTPUTS
CLEAR
FUNCTION
SELECTED
OUTPUT
CONTROL
CLOCK
SERIAL
A/QA
H/QH
QA'
QH'
S1
S0
G1 *
G2 *
(299)
(323)
SL
SR
Z
L
H
H
X
X
X
X
X
Z
Z
L
L
CLEAR
L
L
X
L
L
X
X
X
L
L
L
L
L
X
L
L
L
X
X
X
L
L
L
L
HOLD
H
L
L
L
L
X
X
X
QA0
QH0
QA0
QH0
SHIFT
RIGHT
H
L
H
L
L
X
H
H
QGn
H
QGn
H
L
H
L
L
X
L
L
QGn
L
QGn
SHIFT
LEFT
H
H
L
L
L
H
X
QBn
H
QBn
H
H
H
L
L
L
L
X
QBn
L
QBn
L
LOAD
H
H
H
X
X
X
X
a
h
a
h
* When one or both output controls are high, the eight, input/output terminals are in the high impedance state: however sequential operation or clearing
of the register is not affected.
Z
: HIGH IMPEDANCE
Qn0 : THE LEVEL OF An BEFORE THE INDICATED STEADY STATE INPUT CONDITIONS WERE ESTABLISHED.
Qnn : THE LEVEL ON Qn BEFORE THE MOST RECENT ACTIVE TRANSITION INDICATED BY
OR
a, h : THE LEVEL OF THE STEADY STATE INPUTS A, H, RESPECTIVELY.
X
: DON'T CARE
M54/M74HC299/323
2/15
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