Page 1
SL74HC166
System Logic
Semiconductor
SLS
8-Bit Serial or Parallel-Input/
Serial-Output Shift Register
High-Performance Silicon-Gate CMOS
The SL74HC166 is identical in pinout to the LS/ALS166. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
This device is a parallel-in or serial-in, serial-out shift register with
gated clock inputs and an overriding clear input. The shift/load input
establishes the parallel-in or serial-in mode. When high, this input
enables the serial data input and couples the eight flip -flops for serial
shifting with each clock pulse. Synchronous loading occurs on the
next clock pulse when this is low and the parallel data inputs are
enabled. Serial data flow is inhibited during parallel loading. Clocking is
done on the low-to-high level edge of the clock pulse via a two input
positive NOR gate, which permits one input to be used as a clock
enable or clock inhibit function. Clocking is inhibited when either of the
clock inputs are held high, holding either input low enables the other
clock input. This will allow the system clock to be free running and
the register stopped on command with the other clock input. A
change from low-to-high on the clock inhibit input should only be
done when the clock input is high. A buffered direct clear input
overrides all other inputs, including the clock, andsets all flip -flop to
zero.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
SL74HC166N Plastic
SL74HC166D SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =VCC
PIN 8 = GND
Page 2
SL74HC166
System Logic
Semiconductor
SLS
MAXIMUM RATINGS*
Symbol Parameter Value Unit
VCC DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V
VIN DC Input Voltage (Referenced to GND) -1.5 to VCC +1.5 V
V
OUT
DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V
IIN DC Input Current, per Pin ±20 mA
I
OUT
DC Output Current, per Pin ±25 mA
ICC DC Supply Current, VCC and GND Pins ±50 mA
PD Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
750
500
mW
Tstg Storage Temperature -65 to +150 °C
TL Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
260 °C
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
VCC DC Supply Voltage (Referenced to GND) 2.0 6.0 V
VIN, V
OUT
DC Input Voltage, Output Voltage (Referenced to GND) 0 VCC V
TA Operating Temperature, All Package Types -55 +125 °C
tr, tf Input Rise and Fall Time (Figure 1) VCC =2.0 V
VCC =4.5 V
V
CC
=6.0 V
0
0
0
1000
500
400
ns
This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, VIN and V
OUT
should be constrained to the range
GND≤(VIN or V
OUT
)≤VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC).
Unused outputs must be left open.
Page 3
SL74HC166
System Logic
Semiconductor
SLS
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
VCC Guaranteed Limit
Symbol Parameter Test Conditions V 25 °C
to
-55°C
≤85
°C
≤125
°C
Unit
VIH Minimum High-Level
Input Voltage
V
OUT
=0.1 V or VCC-0.1 V
I
OUT
≤ 20 µA
2.0
4.5
6.0
1.5
3.15
4.2
1.5
3.15
4.2
1.5
3.15
4.2
V
VIL Maximum Low -Level
Input Voltage
V
OUT
=0.1 V or VCC-0.1 V
I
OUT
≤ 20 µA
2.0
4.5
6.0
0.3
0.9
1.2
0.3
0.9
1.2
0.3
0.9
1.2
V
VOH Minimum High-Level
Output Voltage
VIN=VIH or VIL
I
OUT
≤ 20 µA
2.0
4.5
6.0
1.9
4.4
5.9
1.9
4.4
5.9
1.9
4.4
5.9
V
VIN=VIH or VIL
I
OUT
≤ 4.0 mA
I
OUT
≤ 5.2 mA
4.5
6.0
3.98
5.48
3.84
5.34
3.7
5.2
VOL Maximum Low -Level
Output Voltage
VIN=VIH or VIL
I
OUT
≤ 20 µA
2.0
4.5
6.0
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
V
VIN=VIH or VIL
I
OUT
≤ 4.0 mA
I
OUT
≤ 5.2 mA
4.5
6.0
0.26
0.26
0.33
0.33
0.4
0.4
IIN Maximum Input
Leakage Current
VIN=VCC or GND 6.0 ±0.1 ±1.0 ±1.0 µA
ICC Maximum Quiescent
Supply Current
(per Package)
VIN=VCC or GND
I
OUT
=0µA
6.0 8.0 80 160 µA
FUNCTION TABLE
Inputs Internal
Outputs
Output
Clear Shift/Load Clock
Inhibit
Clock SA Parallel
A...H
QA QB QH
L X X X X X L L L
H X X X X No change
H L L X a...h a b h
H H L H X H QAn QGn
H H L L X L QAn QGn
H X H X X X No change
X = don’t care
a...h = the level of steady state input voltage at input A trough H respectively
Page 4
SL74HC166
System Logic
Semiconductor
SLS
AC ELECTRICAL CHARACTERISTICS(C
L
=50pF,Input tr=tf=6.0 ns)
VCC Guaranteed Limit
Symbol Parameter V 25 °C to
-55°C
≤85°C ≤125°C Unit
f
max
Minimum Clock Frequency (50% Duty Cycle)
(Figures 2 and 4)
2.0
4.5
6.0
6.0
31
36
5.0
25
28
4.2
21
25
MHz
t
PLH
, t
PHL
Maximum Propagation Delay, Clock (or Clock
Inhibit) to QH (Figures 2,3 and 4)
2.0
4.5
6.0
140
28
24
175
35
30
210
42
36
ns
t
PHL
Maximum Propagation Delay , Clear to QH (Figures
1 and 4)
2.0
4.5
6.0
150
30
26
200
40
34
230
48
40
ns
t
TLH
, t
THL
Maximum Output Transition Time, Any Output
(Figures 1 and 4)
2.0
4.5
6.0
75
16
14
95
20
18
110
25
20
ns
CIN Maximum Input Capacitance - 10 10 10 pF
Power Dissipation Capacitance (Per Package) Typical @25°C,VCC=5.0 V
CPD Used to determine the no-load dynamic power
consumption:
PD=CPDV
CC
2
f+ICCVCC
140 pF
TIMING REQUIREMENTS(C
L
=50pF,Input tr=tf=6.0 ns)
VCC Guaranteed Limit
Symbol Parameter V 25 °C to
-55°C
≤85°C ≤125°C Unit
tsu Minimum Setup Time, Shift/Load to
Clock (Figure 3)
2.0
4.5
6.0
80
16
14
100
20
18
120
24
20
ns
tsu Minimum Setup Time, Data before
Clock (or Clock Inhibit) (Figure 3)
2.0
4.5
6.0
80
16
14
100
20
18
120
24
20
ns
tw Minimum Pulse Width, Clock (or
Clock Inhibit) (Figure 2)
2.0
4.5
6.0
80
16
14
100
20
17
120
24
20
ns
Page 5
SL74HC166
System Logic
Semiconductor
SLS
Figure 1. Switching Waveforms Figure 2. Switching Waveforms
Figure 3. Switching Waveforms
Figure 4. Test Circuit
Page 6
SL74HC166
System Logic
Semiconductor
SLS
TIMING DIAGRAM
EXPANDED LOGIC DIAGRAM
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