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MM74HC194 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. MM74HC194
Description  4-Bit Bidirectional Universal Shift Register
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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MM74HC194 Datasheet(HTML) 1 Page - National Semiconductor (TI)

   
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TLF5323
November 1995
MM54HC194MM74HC194
4-Bit Bidirectional Universal Shift Register
General Description
This 4-bit high speed bidirectional shift register utilizes ad-
vanced silicon-gate CMOS technology to achieve the low
power consumption and high noise immunity of standard
CMOS integrated circuits along with the ability to drive 10
LS-TTL loads This device operates at speeds similar to the
equivalent low power Schottky part
This bidirectional shift register is designed to incorporate
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 operating mode control
inputs and a direct overriding clear line The register has
four distinct modes of operation PARALLEL (broadside)
LOAD SHIFT RIGHT (in the direction QA toward QD)
SHIFT LEFT INHIBIT CLOCK (do nothing)
Synchronous parallel loading is accomplished by applying
the four bits of data 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 inhib-
ited Shift right is accomplished synchronously with the ris-
ing 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 entered at the SHIFT LEFT
serial input Clocking of the flip flops is inhibited when both
mode control inputs are low The mode control inputs
should be changed only when the CLOCK input is high
The 54HC74HC logic family is functionally as well as pin-
out compatible with the standard 54LS74LS logic family
All inputs are protected from damage due to static dis-
charge by internal diode clamps to VCC and ground
Features
Y
Typical operating frequency 45 MHz
Y
Typical propagation delay ns (clock to Q)
Y
Wide operating supply voltage range 2 – 6V
Y
Low input current 1 mA maximum
Y
Low
quiescent
supply
current
160
m
A
maximum
(74HC Series)
Y
Fanout of 10 LS-TTL loads
Connection Diagram
Dual-In Line Package
TLF5323 – 1
Order Number MM54HC194 or MM74HC194
Function Table
Inputs
Outputs
Mode
Serial
Parallel
Clear
S1 S2
Clock
Left Right A B C D
QA QB QC QD
LX
X
X
X
X
X X X X
L
L
L
L
HX
X
L
X
X
X X X X QA0 QB0 QC0 QD0
HH
H
u
XX
a b c d
a
b
c
d
HL
H
u
XH
X X X X
H
QAn QBn QCn
HL
H
u
XL
X X X X
L
QAn QBn QCn
HH
L
u
HX
X X X X QBn QCn QDn H
HH
L
u
LX
X X X X QBn QCn QDn
L
HL
L
X
X
X
X X X X QA0 QB0 QC0 QD0
H e high level (steady state)
L e low level (steady state)
X e irrelevant (any input including transitions)
u e transition from low to high level
a b c d e the level of steady-state input at inputs A B C or D
respectively
QA0 QB0 QC0 QD0 e the level of QA QB QC orQD respectively
before the indicated steady-state input conditions were established
QAn QBn QCn QDn e the level of QA QB QC respectively before
the most-recent
u transition of the clock
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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