Page 1
HD74HC166
Parallel-load 8-bit Shift Register
Description
This device is an 8-bit shift register with an output from the last stage. Data may be loaded into the register
either in parallel or in serial form. When the Shift/Load input is low, the data is loaded asynchronously in
parallel. When the Shift/Load input is high, the data is loaded serially on the rising edge of either clock
inhibit or Clock. Clear is asynchronous and active-low.
The 2-input NOR clock may be used either by combining two independent clock sources or by designating
one of the clock inputs to act as a clock inhibit.
Features
• High Speed Operation: tpd (Clock to QH) = 14 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs
Parallel Internal Outputs Output
Clear Shift/Load Clock Inhibit Clock Serial A ··· H Q
L X X XXXLLL
H X L LXXQA0Q
HL L X a ··· h a b h
HH L HXHQAnQ
HH L LXLQAnQ
HX H XXQA0Q
A
Q
B
B0
B0
Q
H
Q
H0
Gn
Gn
Q
H0
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HD74HC166
Pin Arrangement
Serial
Input
Parallel
Inputs
Clock
Inhibit
Clock
GND
16
1
2
A
3
B
4
C
5
D
6
7
8
(Top view)
V
15
Shift/Load
Parallel
14
Input H
Output
13
Q
12
G
11
F
10
E
9
Clear
CC
H
Parallel
Inputs
2
Page 3
Logic Diagram
Clear
Clock
Clock
Inhibit
Shift/
Load
Serial
Input
HD74HC166
CK
CK
D Q
A
B
C
D
E
CLK
CK
CK
D Q
CLK
CK
CK
D Q
CLK
CK
CK
D Q
CLK
CK
CK
D Q
CLK
H
CK
CK
D Q
F
G
CLK
CK
CK
D Q
CLK
CK
CK
D Q
CLK
H
Q
3
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HD74HC166
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
IL
2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –4 mA
6.0 5.68 — — 5.63 — IOH = –5.2 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 4 mA
6.0 — — 0.26 — 0.33 IOL = 5.2 mA
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
I
CC
6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
current
+85°C
4
Page 5
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol V
Maximum clock f
max
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 5 — 4 MHz
frequency 4.5 — — 25 — 20
6.0 — — 29 — 24
Propagation delay t
time t
PHL
PLH
2.0 — — 175 — 220 ns Clock to Q
4.5 — 14 35 — 44
6.0 — — 30 — 37
t
PHL
2.0 — — 150 — 190 ns Clear to Q
4.5 — 12 30 — 38
6.0 — — 26 — 33
Setup time t
su
2.0 150 — — 190 — ns Shift/Load to Clock
4.5 30 2 — 38 —
6.0 26 — — 33 —
2.0 100 — — 125 — ns Data to Clock
4.5 20 1 — 25 —
6.0 17 — — 21 —
Hold time t
h
2.0 5 — — 5 — ns Clock to Data
4.5 5 0 — 5 —
6.0 5 — — 5 —
Pulse width t
w
2.0 80 — — 100 — ns Clock, Clear
4.5 16 6 — 20 —
6.0 14 — — 17 —
Output rise/fall t
time t
TLH
THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
+85°C
HD74HC166
H
H
5
Page 6
HD74HC166
Timing Diagram
Clock
Clock Inhibit
Clear
Serial Input
Shift/Load
Parallel
Inputs
Output Q
A
B
C
D
E
F
G
H
H H
Serial Shift
Clear Load
H
L
H
L
H
L
H
H
Inhibit
HH HHLLLL
Serial Shift
6
Page 7
19.20
20.00 Max
16 9
1.3
Unit: mm
6.30
7.40 Max
81
1.11 Max
2.54 ± 0.25
0.48 ± 0.10
5.06 Max
2.54 Min
0.51 Min
Hitachi Code
JEDEC
EIAJ
Weight
7.62
+ 0.13
0.25
– 0.05
0° – 15°
(reference value)
DP-16
Conforms
Conforms
1.07 g
Page 8
16
Unit: mm
10.06
10.5 Max
9
5.5
1
0.80 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.12
2.20 Max
0.10 ± 0.10
0.15
M
7.80
0.20 ± 0.04
*0.22 ± 0.05
0.70 ± 0.20
Hitachi Code
JEDEC
EIAJ
(reference value)
Weight
+ 0.20
– 0.30
1.15
0° – 8°
FP-16DA
—
Conforms
0.24 g
Page 9
16
Unit: mm
9.9
10.3 Max
9
1
1.27
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.25
+ 0.11
– 0.04
0.14
0.15
3.95
1.75 Max
M
6.10
1.08
0.20 ± 0.03
*0.22 ± 0.03
0.60
Hitachi Code
JEDEC
EIAJ
Weight
+ 0.10
– 0.30
0° – 8°
+ 0.67
– 0.20
(reference value)
FP-16DN
Conforms
Conforms
0.15 g
Page 10
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,
copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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