DATA SHEET
Product specification
File under Integrated Circuits, IC06
December 1990
INTEGRATED CIRCUITS
74HC/HCT166
8-bit parallel-in/serial-out shift
register
For a complete data sheet, please also download:
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
December 1990
2
Philips Semiconductors
Product specification
8-bit parallel-in/serial-out shift register
74HC/HCT166
FEATURES
Synchronous parallel-to-serial applications
Synchronous serial data input for easy expansion
Clock enable for "do nothing" mode
Asynchronous master reset
For asynchronous parallel data load see "165"
Output capability: standard
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT166 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT166 are 8-bit shift registers which have a
fully synchronous serial or parallel data entry selected by
an active LOW parallel enable (PE) input. When PE is
LOW one set-up time prior to the LOW-to-HIGH clock
transition, parallel data is entered into the register. When
PE is HIGH, data is entered into the internal bit position Q
0
from serial data input (D
s
), and the remaining bits are
shifted one place to the right (Q
0
Q
1
Q
2
, etc.) with
each positive-going clock transition.
This feature allows parallel-to-serial converter expansion
by tying the Q
7
output to the D
s
input of the succeeding
stage.
The clock input is a gated-OR structure which allows one
input to be used as an active LOW clock enable (CE) input.
The pin assignment for the CP and CE inputs is arbitrary
and can be reversed for layout convenience. The
LOW-to-HIGH transition of input CE should only take place
while CP is HIGH for predictable operation. A LOW on the
master reset (MR) input overrides all other inputs and
clears the register asynchronously, forcing all bit positions
to a LOW state.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
C; t
r
= t
f
= 6 ns
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
W):
P
D
= C
PD
V
CC
2
f
i
+
(C
L
V
CC
2
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
(C
L
V
CC
2
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
-
1.5 V
ORDERING INFORMATION
See
"74HC/HCT/HCU/HCMOS Logic Package Information"
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLH
propagation delay
CP to Q
7
MR to Q
7
C
L
= 15 pF; V
CC
= 5 V
15
14
20
19
ns
ns
f
max
maximum clock frequency
63
50
MHz
C
I
input capacitance
3.5
3.5
pF
C
PD
power dissipation capacitance per package
notes 1 and 2
41
41
pF
December 1990
3
Philips Semiconductors
Product specification
8-bit parallel-in/serial-out shift register
74HC/HCT166
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1
D
s
serial data input
2, 3, 4, 5, 10, 11, 12, 14
D
0
to D
7
parallel data inputs
6
CE
clock enable input (active LOW)
7
CP
clock input (LOW-to-HIGH edge-triggered)
8
GND
ground (0 V)
9
MR
asynchronous master reset (active LOW)
13
Q
7
serial output from the last stage
15
PE
parallel enable input (active LOW)
16
V
CC
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
4
Philips Semiconductors
Product specification
8-bit parallel-in/serial-out shift register
74HC/HCT166
FUNCTION TABLE
Notes
1. H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
q = lower case letters indicate the state of the referenced output one set-up time prior to the
LOW-to-HIGH CP transition
X = don't care
= LOW-to-HIGH CP transition
OPERATING MODES
INPUTS
Q
n
REGISTER
OUTPUT
PE
CE
CP
D
S
D
0
-D
7
Q
0
Q
1
-Q
6
Q
7
parallel load
I
I
I
I
X
X
I - I
h - h
L
H
L - L
H - H
L
H
serial shift
h
h
I
I
I
h
X - X
X - X
L
H
q
0
- q
5
q
0
- q
5
q
6
q
6
hold "do nothing"
X
h
X
X
X - X
q
0
q
1
- q
6
q
7
Fig.4 Functional diagram.
December 1990
5
Philips Semiconductors
Product specification
8-bit parallel-in/serial-out shift register
74HC/HCT166
Fig.5 Logic diagram.
Fig.6 Typical clear, shift, load, inhibit, and shift sequences.
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