74LS194A 반도체 회로 부품 판매점
4-Bit Bidirectional Universal Shift Register
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 National Semiconductor |
June 1989
54LS194A DM74LS194A 4-Bit
Bidirectional Universal Shift Register
General Description
This bidirectional shift register is designed to incorporate
virtually all of the features a system designer may want in a
shift register they feature parallel inputs parallel outputs
right-shift and left-shift serial inputs operating-mode-control
inputs and a direct overriding clear line The register has
four distinct modes of operation namely
Parallel (broadside) load
Shift right (in the direction QA toward QD)
Shift left (in the direction QD toward QA)
Inhibit clock (do nothing)
Synchronous parallel loading is accomplished by applying
the four bits of data and taking both mode control inputs S0
and S1 high The data is loaded into the associated flip-
flops and appear at the outputs after the positive transition
of the clock input During loading serial data flow is inhibit-
ed
Shift right is accomplished synchronously with the rising
edge of the clock pulse when S0 is high and S1 is low
Serial data for this mode is entered at the shift-right data
input When S0 is low and S1 is high data shifts left syn-
chronously and new data is entered at the shift-left serial
input
Clocking of the flip-flop is inhibited when both mode control
inputs are low
Features
Y Parallel inputs and outputs
Y Four operating modes
Synchronous parallel load
Right shift
Left shift
Do nothing
Y Positive edge-triggered clocking
Y Direct overriding clear
Connection Diagram
Dual-In-Line Package
TL F 6407 – 1
Order Number 54LS194ADMQB 54LS194AFMQB
54LS194ALMQB DM74LS194AM or DM74LS194AN
See NS Package Number E20A J16A M16A N16E or W16A
C1995 National Semiconductor Corporation TL F 6407
RRD-B30M105 Printed in U S A
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
7V
Operating Free Air Temperature Range
54LS
b55 C to a125 C
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed 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
VCC Supply Voltage
VIH High Level Input Voltage
VIL Low Level Input Voltage
IOH High Level Output Current
IOL Low Level Output Current
fCLK
Clock Frequency (Note 1)
Clock Frequency (Note 2)
tW
Pulse Width
Clock
(Note 3)
Clear
tSU Setup Time Mode
(Note 3)
Data
tH Hold Time (Note 3)
tREL
Clear Release Time (Note 3)
TA Free Air Operating Temperature
Note 1 CL e 15 pF TA e 25 C and VCC e 5V
Note 2 CL e 50 pF RL e 2 kX TA e 25 C and VCC e 5V
Note 3 TA e 25 C and VCC e 5V
Min
45
2
30
22
17
12
25
16
0
18
b55
54LS194A
Nom
5
Max
55
07
b0 4
4
0
125
DM74LS194A
Min Nom Max
4 75 5
5 25
2
08
b0 4
8
0 25
0 20
20
20
30
20
0
25
0 70
Units
V
V
V
mA
mA
MHz
ns
ns
ns
ns
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 4)
Max
Units
VI
VOH
VOL
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
VCC e Min IOL e Max
VIL e Max VIH e Min
54LS
DM74
54LS
DM74
25
27
b1 5
V
V
34
04
0 35 0 5 V
IOL e 4 mA VCC e Min
II
Input Current Max
VCC e Max VI e 7V
Input Voltage
04
0 1 mA
IIH
High Level Input Current
VCC e Max VI e 2 7V
IIL
Low Level Input Current
VCC e Max VI e 0 4V
IOS Short Circuit
Output Current
VCC e Max
(Note 5)
54LS
DM74
b20
b20
20
b0 4
b100
b100
mA
mA
mA
ICC Supply Current
VCC e Max (Note 6)
15 23 mA
Note 4 All typicals are at VCC e 5V TA e 25 C
Note 5 Not more than one output should be shorted at a time and the duration should not exceed one second
Note 6 With all outputs open inputs A through D grounded and 4 5V applied to S0 S1 CLEAR and the serial inputs ICC is tested with momentary ground then
4 5V applied to CLOCK
2
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74LS194A register
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