Page 1
54165/DM74165
8-Bit Parallel-to-Serial Converter
General Description
The ’165 is an 8-bit parallel load or serial-in register with
complementary outputs available from the last stage. Parallel inputting occurs asynchronously when the Parallel Load
(PL
) input is LOW. With PL HIGH, serial shifting occurs on
the rising edge of the clock; new data enters via the Serial
Data (D
bine two independent clock sources, or one input can act as
an active LOW clock enable.
August 1989
) input. The 2-input OR clock can be used to com-
S
54165/DM74165 8-Bit Parallel-to-Serial Converter
Connection Diagram
Dual-In-Line-Package
Order Number 54165DMQB, 54165FMQB or DM74165N
See NS Package Number J16A, N16E or W16A
Pin Names Description
CP1, CP2 Clock Pulse Inputs (Active Rising Edge)
D
S
PL
P0–P7 Parallel Data Inputs
Q7 Serial Output from Last Stage
Q7 Complementary Output
TL/F/9782– 1
Serial Data Input
Asynchronous Parallel Load Input
(Active LOW)
Logic Symbol
V
CC
GND
e
e
Pin 16
Pin 8
TL/F/9782– 2
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
TL/F/9782
Page 2
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range
54
DM74 0
Storage Temperature Range
b
55§Ctoa125§C
Ctoa70§C
§
b
65§Ctoa150§C
Note:
The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.
Recommended Operating Conditions
Symbol Parameter
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
High Level Input Voltage 2 2 V
Low Level Input Voltage 0.8 0.8 V
High Level Output Current
Low Level Output Current 16 16 mA
Free Air Operating Temperature
Min Nom Max Min Nom Max
b
ts(H) Setup Time HIGH or LOW 10 10
(L) Pnto PL 10 10
t
s
th(H) Hold Time HIGH or LOW 10 0
(L) Pnto PL 10 0
t
h
ts(H) Setup Time HIGH or LOW 20 20
ts(L) DSto CP
n
20 20
th(H) Hold Time HIGH or LOW 0 0
(L) DSto CP
t
h
t
(H) Setup Time HIGH
s
n
CP1 to CP2 or CP2 to CP1
30 30 ns
tw(H) CPnPulse Width HIGH 25 25 ns
tw(L) PL Pulse Width LOW 15 15 ns
t
rec
Recovery Time, PL to CP
n
45 45 ns
54165 DM74165
b
0.8
b
0.8 mA
55 125 0 70
00
Units
C
§
ns
ns
ns
ns
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
eb
V
I
V
OH
V
OL
I
I
I
IH
I
IL
I
OS
I
CC
Input Clamp Voltage V
High Level Output Voltage V
Low Level Output Voltage V
Input Current@Max V
Input Voltage
High Level Input Current V
Low Level Input Current V
Short Circuit V
Output Current (Note 2)
Supply Current V
e
Min, I
CC
CC
CC
CC
CC
CC
CC
CC
P
n
I
e
e
e
e
e
e
e
e
K,CP1,CP
e
Min, I
OH
e
Min, V
IH
e
Max, V
I
e
Max, V
I
e
Max, V
I
Max 54
e
Max, PL
12 mA
e
Max, V
Max 2.4 3.4 V
IL
Min 0.2 0.4 V
5.5V
2.4V PL 80
Inputs 40
0.4V PL
Inputs
b
DM74
b
ß
e
4.5V
2
2
Typ
(Note 1)
Max Units
b
1.5 V
1mA
mA
b
3.2
1.6
55
55
mA
mA
b
20
18
b
b
63 mA
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Switching Characteristics
ea
V
CC
Symbol Parameter R
5.0V, T
ea
25§C (See Section 1 for waveforms and load configurations)
A
e
C
15 pF
L
e
400X Units
L
Min Max
f
max
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Note 1: All typicals are at V
Note 2: Not more than one output should be shorted at a time.
Maximum Clock Frequency 20 MHz
Propagation Delay 31
PL to Q7 or Q740
Propagation Delay 24
CP1 to Q7 or Q731
Propagation Delay 17
P7 to Q7 36
Propagation Delay 27
P7 to Q727
e
e
5V, T
CC
25§C.
A
Functional Description
The ’165 contains eight clocked master/slave RS flip-flops
connected as a shift register with auxiliary gating to provide
overriding asynchronous parallel entry. Parallel data enters
when the PL
while PL
signal is LOW. The parallel data can change
is LOW provided that the recommended setup and
hold times are observed.
For clocked operation, PL
must be HIGH. The two clock
inputs perform identically; one can be used as a clock inhibit
by applying a HIGH signal. To avoid double clocking, however, the inhibit signal should only go HIGH while the clock
is HIGH. Otherwise, the rising inhibit signal will cause the
same response as a rising clock edge. The flip-flops are
edge-triggered for serial operations. The serial input data
can change at any time, provided only that the recommended setup and hold times are observed, with respect to the
rising edge of the clock.
Truth Table
PL
CP Contents
1 2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
L X X P0 P1 P2 P3 P4 P5 P6 P7 Parallel Entry
HLLD
HHLQ0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 No Change
H L LD
H L H Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 No Change
HeHIGH Voltage Level
e
LOW Voltage Level
L
e
Immaterial
X
e
Positive Rising Edge
L
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Right Shift
S
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Right Shift
S
Response
ns
ns
ns
ns
Logic Diagram
TL/F/9782– 3
3
Page 4
4
Page 5
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54165DMQB
NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74165N
NS Package Number N16E
5
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Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54165FMQB
NS Package Number W16A
54165/DM74165 8-Bit Parallel-to-Serial Converter
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with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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