M54HC194
M74HC194
October 1992
4 BIT PIPO SHIFT REGISTER
B1R
(Plastic Package)
ORDER CODES :
M54HC194F1R
M74HC194M1R
M74HC194B1R
M74HC194C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
DESCRIPTION
.
HIGH SPEED
t
PD
= 12 ns (TYP.) AT V
CC
= 5 V
.
LOW POWER DISSIPATION
I
CC
= 4
A (MAX.) AT T
A
= 25
C
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
I
OH
= I
OL
= 4 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
.
HIGH NOISE IMMUNITY
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
.
WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V TO 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS194
The M54/74HC194 is a high speed CMOS 4 BIT PIPO
SHIFT REGISTER fabricated in silicon gate C
2
MOS
technology. It has the same high speed performance
of LSTTL combined with true CMOS low power con-
sumption. This SHIFT REGISTER is designed to in-
corporate virtually all of the features a system designer
may want in a shift register. It features parallel inputs,
parallel outputs, right shift and left shift serial inputs,
clear line. The register has four distinct modes of oper-
ation : PARALLEL (broadside) LOAD ; SHIFT RIGHT
(in the direction Q
A
Q
D
); SHIFT LEFT ; INHIBIT
CLOCK (do nothing). Synchronous parallel loading is
accomplished by applying the four data bits and taking
both mode control inputs, S0 and S1 high. The data
are loaded into their respective flip-flops and appear
at the outputs after the positive transition of the
CLOCK input. During loading, serial data flow is in-
hibited. Shift right is accomplished synchronously with
the rising edge of the clock pulse when S0 is high and
S1 is low. Serial data for this mode is entered at the
SHIFT RIGHT data input. When S0 is low and S1 is
high,data shifts left synchronously and new data is en-
tered at the SHIFT LEFT serial input. Clocking of the
flipflops is inhibited when both mode control inputs are
low. The mode control inputs should be changed only
when the CLOCK input is high. All inputs are equipped
with protection circuits against static discharge and
transient excess voltage.
1/12
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
OUTPUS
CLEAR
MODE
CLOCK
SERIAL
PARALLEL
QA
QB
QC
QD
S1
S0
LEFT
RIGHT
A
B
C
D
L
X
X
X
X
X
X
X
X
X
L
L
L
L
H
X
X
X
X
X
X
X
X
QA0
QB0
QC0
QD0
H
H
H
X
X
a
b
c
d
a
b
c
d
H
L
H
X
H
X
X
X
X
H
QAn
QBn
QCn
H
L
H
X
L
X
X
X
X
L
QAn
QBn
QCn
H
H
L
H
X
X
X
X
X
QBn
QCn
QDn
H
H
H
L
L
X
X
X
X
X
QBn
QCn
QDn
L
H
L
L
X
X
X
X
X
X
X
QA0
QB0
QC0
QD0
X: Don't Care
: Don't Care
a ~ d
: The level of steady state input voltage at input A ~ D respactively
QA0 ~ QD0
: No change
QAn ~ QDn
: The level of QA, QB, QC, respectively, before the mst recent positive transition of the clock.
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1
CLEAR
Asynchronous Reset
Input (Active LOW)
2
SR
Serial Data Input (Shift
Right)
3, 4, 5, 6
A to D
Parallel Data Input
7
SL
Serial Data Input (Shift
Left)
9, 10
S0, S1
Mode Control Inputs
11
CLOCK
Clock Input (LOW to
HIGH Edge-triggered)
15, 14, 13, 12
QA to QD
Paralle Outputs
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
IEC LOGIC SYMBOL
M54/M74HC194
2/12
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Source Sink Current Per Output Pin
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
P
D
Power Dissipation
500 (*)
mW
T
stg
Storage Temperature
-65 to +150
o
C
T
L
Lead Temperature (10 sec)
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
(*) 500 mW:
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2 to 6
V
V
I
Input Voltage
0 to V
CC
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
o
C
o
C
t
r
, t
f
Input Rise and Fall Time
V
CC
= 2 V
0 to 1000
ns
V
CC
= 4.5 V
0 to 500
V
CC
= 6 V
0 to 400
M54/M74HC194
4/12
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