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STMicroelectronics
STMicroelectronics

74194 Datasheet

4 BIT PIPO SHIFT REGISTER


74194 Datasheet Preview


M54HC194
M74HC194
. HIGH SPEED
tPD = 12 ns (TYP.) AT VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH= IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS194
4 BIT PIPO SHIFT REGISTER
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M 54HC 19 4F 1R
M 74H C1 94 M1 R
M 74HC 19 4B 1R
M 74H C1 94 C1 R
DESCRIPTION
The M54/74HC194 is a high speed CMOS 4 BIT PIPO
SHIFT REGISTER fabricated in silicon gate C2MOS
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 QA QD); 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.
October 1992
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
1/12
Page 1

M54/M74HC194
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
SYMBOL
CLEAR
2 SR
3, 4, 5, 6
7
A to D
SL
9, 10
11
S0, S1
CLOCK
15, 14, 13, 12
8
16
QA to QD
GND
VCC
NAME AND FUNCTION
Asynchronous Reset
Input (Active LOW)
Serial Data Input (Shift
Right)
Parallel Data Input
Serial Data Input (Shift
Left)
Mode Control Inputs
Clock Input (LOW to
HIGH Edge-triggered)
Paralle Outputs
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOL
TRUTH TABLE
INPUTS
CLEAR
MODE
S1 S0
CLOCK
SERIAL
PARALLEL
LEFT RIGHT A B C D
QA
L X X X X X XXXX L
HXX
X X X X X X QA0
HHH
X X abcd a
HLH
X H XXXX H
HLH
X L XXXX L
HHL
H X X X X X QBn
HHL
L X X X X X QBn
H L L X X X X X X X QA0
X: Don’t Care
a ~d
QA0 ~ QD0
QAn ~ QDn
: Don’t Care
: The level of steady state input voltage at input A ~ D respactively
: No change
: The level of QA, QB, QC, respectively, before the mst recent positive transition of the clock.
OUTPUS
QB QC
L
QB0
b
QAn
QAn
QCn
QCn
QB0
L
QC0
c
QBn
QBn
QDn
QDn
QC0
QD
L
QD0
d
QCn
QCn
H
L
QD0
2/12
Page 2

LOGIC DIAGRAM
M54/M74HC194
TIMING CHART
3/12
Page 3

M54/M74HC194
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7
V
VI DC Input Voltage
-0.5 to VCC + 0.5
V
VO DC Output Voltage
-0.5 to VCC + 0.5
V
IIK DC Input Diode Current
IOK DC Output Diode Current
IO DC Output Source Sink Current Per Output Pin
± 20 mA
± 20 mA
± 25 mA
ICC or IGND DC VCC or Ground Current
± 50 mA
PD Power Dissipation
500 (*)
mW
Tstg Storage Temperature
-65 to +150
oC
TL Lead Temperature (10 sec)
300 oC
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW: 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
VO
Top
tr, tf
Parameter
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature: M54HC Series
M74HC Series
Input Rise and Fall Time
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
Value
2 to 6
0 to VCC
0 to VCC
-55 to +125
-40 to +85
0 to 1000
0 to 500
0 to 400
Unit
V
V
V
oC
oC
ns
4/12
Page 4
Part Number 74194
Manufactur STMicroelectronics
Description 4 BIT PIPO SHIFT REGISTER
Total Page 12 Pages
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