The M54/74HC166 is a high speed C2MOS 8 BIT
PISO SHIFT REGISTER fabricated in silicon gate
C2MOStechnology. Ithasthesamehighspeedperformance of LSTTL combined with true CMOS low
powerconsumption.
It consists of parallel or serial inputsand aserial-out
8-bit shift register with gated clock inputs and an
overriding clear input. The parallel-in or serial-in
modes are controlled by the SHIFT/LOAD input.
Whenthe SHIFT/LOADinputis held high, theserial
data input isenabled andtheeightflip-flopsperform
serialshiftingwitheach clockpulse.When heldlow,
the parallel data inputs are enabled and synchronous loading occurs on the next clock pulse.
Clocking is accomplished on the low-to-high level
edge of theclock pulse. The CLOCK-INHIBITinput
should be changed to the high only while the
CLOCKinput is held high. A directclear input overrides all other inputs, including the clock, and sets
all flip-flops to zero. Functional detailsareshown in
the truthtable and the timing chart.
All inputs are equipped with protection circuits
against static discharge and transient excess voltage.
PIN CONNECTIONS(top view)
NC =
No InternalCon-
October 1992
1/13
Page 2
M54/M74HC166
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
IEC LOGIC SYMBOL
PIN NoSYMBOLNAME AND FUNCTION
1SISerial Data Inputs
2, 3, 4, 5,
A to HParallel Data Inputs
10, 11, 12,
14
6CK INHClock Enable Input
(Active LOW)
7CKClock Input (LOW to
HIGH edge-triggered)
9CLEARAsyncronous Master reset
Input (Active LOW)
13Q
H
Serial Output from the
Last Stage
15S/LParallelEnable Input
(Active LOW)
8GNDGround (0V)
16V
CC
Positive Supply Voltage
TRUTH TABLE
INPUTS
CLEARSHIFT/LOAD CLOCK INHCLOCKSERIAL IN
PARALLEL
...............
A
LXXXXXLLL
LXXXXNO CHANGE
HLLXa
................
HHLHXHQAnQGn
HHLLXLQAnQGn
HXHXXXNO CHANGE
X:Don’tCare
...........
a
h : Thelevel ofsteady stateinput voltageat inputs a trough H respectively
Supply Voltage-0.5 to +7V
DC Input Voltage-0.5 to VCC+ 0.5V
I
DC Output Voltage-0.5 to VCC+ 0.5V
DC Input Diode Current± 20mA
DC Output Diode Current± 20mA
DC Output Source Sink Current Per Output Pin± 25mA
DC VCCor Ground Current± 50mA
GND
Power Dissipation500 (*)mW
Storage Temperature-65 to +150
Lead Temperature (10 sec)300
L
Supply Voltage2 to 6V
Input Voltage0 to V
Output Voltage0 to V
Operating Temperature: M54HC Series
M74HC Series
CC
CC
-55 to +125
-40 to +85
Input Rise and Fall TimeVCC= 2 V0 to 1000ns
V
= 4.5 V0 to 500
CC
V
= 6 V0 to 400
CC
o
C
o
C
V
V
o
C
o
C
4/13
Page 5
DC SPECIFICATIO NS
SymbolParameter
V
V
V
V
I
High Level Input
IH
Voltage
Low Level Input
IL
Voltage
High Level
OH
Output Voltage
Low Level Output
OL
Voltage
I
Input Leakage
I
Current
Quiescent Supply
CC
Current
M54/M74HC166
Test ConditionsValue
T
=25oC
V
(V)
CC
A
54HC and 74HC
Min.Typ.Max.Min.Max.Min.Max.
2.01.51.51.5
4.53.153.153.15
6.04.24.24.2
2.00.50.50.5
4.51.351.351.35
6.01.81.81.8
2.0
4.54.44.54.44.4
6.05.96.05.95.9
4.5I
6.0I
2.0
4.50.00.10.10.1
6.00.00.10.10.1
4.5I
6.0I
6.0
=
V
I
IO=-20 µA
V
IH
or
V
IL
=-4.0 mA 4.184.314.134.10
O
=-5.2 mA 5.685.85.635.60
O
V
=
I
IO=20µA
V
IH
or
V
IL
= 4.0 mA0.170.260.330.40
O
= 5.2 mA0.180.260.330.40
O
VI=VCCor GND±0.1±1±1µA
1.92.01.91.9
0.00.10.10.1
6.0 VI=VCCor GND44080µA
-40 to 85oC
74HC
-55 to 125oC
54HC
Unit
V
V
V
V
5/13
Page 6
M54/M74HC166
AC ELECTRICAL CHARACTERISTICS (CL=50pF,Inputtr=tf=6ns)
Test ConditionsValue
T
=25oC
SymbolParameter
t
t
TLH
THL
Output Transition
Time
V
CC
(V)
2.0307595110
4.58151922
A
54HC and 74HC
Min.Typ.Max.Min.Max.Min.Max.
6.07131619
t
PLH
t
PHL
t
PHL
f
MAX
Propagation
Delay Time
(CLOCK - QH)
Propagation
Delay Time
(CLEAR - QH)
Maximum Clock
Frequency
2.070150190225
4.520303845
6.016263238
2.060135170205
4.518273441
6.014232935
2.06.2145.04.2
4.531502521
6.037633025
t
W(H)
t
W(L)
Minimum Pulse
Width
(CLOCK)
t
W(L)
Minimum Pulse
Width
(CLEAR)
Minimum Set-up
t
s
Time
(SI, PI)
Minimum Set-up
t
s
Time
(S/L)
Minimum Hold
t
h
Time
2.0287595110
4.56151922
6.05131619
2.0287595110
4.56151922
6.05131619
2.0207595110
4.54151922
6.03131619
2.0257595110
4.55151922
6.03131619
2.0000
4.5000
6.0000
t
REM
Minimum
Removal Time
2.012506575
4.53101315
6.0391113
C
C
PD
Input Capacitance5101010pF
IN
(*)Power Dissipation
60
Capacitance
(*) CPDisdefined as the value ofthe IC’sinternal equivalent capacitance whichis calculated fromthe operatingcurrentconsumption without load.
(Referto Test Circuit). Average operting current canbe obtained bythefollowingequation. ICC(opr) = CPD•VCC•fIN+I
-40 to 85oC
74HC
-55 to 125oC
54HC
CC
Unit
ns
ns
ns
MHz
ns
ns
ns
ns
ns
ns
pF
6/13
Page 7
SWITCHING CHARACTERISTICS TEST WAVEFORM
CLEARMODESERIAL MODE
PARALLEL MODE
M54/M74HC166
7/13
Page 8
M54/M74HC166
TEST CIRCUIT ICC(Opr.)
INPUT WAVEFORMIS THESAMEAS THAT IN CASEOF SWITCHINGCHARACTERISTICSTEST.
Information furnishedis believed to be accurate and reliable. However, SGS-THOMSON Microelectronicsassumes no responsability for the
consequences of useof suchinformation nor forany infringement of patents or other rights of third parties which may results from its use. No
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in this publication are subjectto changewithout notice. This publication supersedes andreplaces all information previously supplied.
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written approval of SGS-THOMSON Microelectonics.
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