M54HC194
M74HC194
October 1992
4 BIT PIPO SHIFT REGISTER
B1R
(Plastic Package)
ORDER CODES :
M54HC194F1R
M74HC194B1R
M74HC194M1R
M74HC194C1R
F1R
(CeramicPackage)
M1R
(MicroPackage)
C1R
(Chip Carrier)
PIN CONNECTIONS
(top view)
NC =
DESCRIPTION
TheM54/74HC194 isahighspeed CMOS4BITPIPO
SHIFTREGISTER fabricated in silicon gate C
2
MOS
technology. It has the same high speed performance
ofLSTTL combined with true CMOS lowpower con-
sumption. This SHIFT REGISTER is designed to in-
corporate virtuallyallofthefeaturesasystemdesigner
maywantina shift register. Itfeatures parallel inputs,
parallel outputs, right shift and left shift serial inputs,
clearline.Theregisterhasfourdistinctmodesofoper-
ation:PARALLEL (broadside) LOAD;SHIFTRIGHT
(in the direction Q
A
Q
D
); SHIFT LEFT ; INHIBIT
CLOCK(donothing). Synchronous parallel loading is
accomplished byapplyingthefourdatabitsand 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.Shiftright isaccomplished synchronously with
therisingedge ofthe clockpulse whenS0ishigh and
S1 is low. Serial data for this mode is entered at the
SHIFTRIGHT data input. When S0 is lowand S1 is
high,data shiftsleftsynchronously andnewdataisen-
tered at the SHIFT LEFT serialinput. Clocking of the
flipflopsisinhibited whenbothmodecontrolinputsare
low.Themodecontrol inputsshouldbe changedonly
whentheCLOCKinput ishigh.Allinputsareequipped
with protection circuits against static discharge and
transient excess voltage.
.
HIGH SPEED
t
PD
= 12 ns(TYP.) AT V
CC
= 5 V
.
LOWPOWER DISSIPATION
I
CC
= 4
μ
A(MAX.) AT T
A
= 25
°
C
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
I
OH
= I
OL
= 4 mA(MIN.)
.
BALANCEDPROPAGATION 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 TO6 V
.
PIN ANDFUNCTION COMPATIBLE
WITH 54/74LS194
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