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National Semiconductor Electronic Components Datasheet

DM54S194 Datasheet

4-Bit Bidirectional Universal Shift Registers

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June 1989
DM54S194 DM74S194
4-Bit Bidirectional Universal Shift Registers
General Description
These bidirectional shift registers are designed to incorpo-
rate virtually all of the features a system designer may want
in a shift register they feature parallel inputs parallel out-
puts 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 are 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
Y Typical clock frequency 105 MHz
Y Typical power dissipation 425 mW
Connection Diagram
Dual-In-Line Package
Order Number DM54S194J or DM74S194N
See NS Package Number J16A or N16E
TL F 6475 – 1
C1995 National Semiconductor Corporation TL F 6475
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

DM54S194 Datasheet

4-Bit Bidirectional Universal Shift Registers

No Preview Available !

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
DM54S
b55 C to a125 C
DM74S
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
VIH
VIL
IOH
IOL
fCLK
fCLK
tW
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Clock Frequency (Note 1)
Clock Frequency (Note 2)
Pulse Width
(Note 3)
Clock
Clear
tSU Setup Time
(Note 3)
Mode
Data
tH Hold Time (Note 3)
tREL
Clear Release Time (Note 3)
TA Free Air Operating Temperature
Note 1 CL e 15 pF RL e 280X TA e 25 C and VCC e 5V
Note 2 CL e 50 pF RL e 280X TA e 25 C and VCC e 5V
Note 3 TA e 25 C and VCC e 5V
DM54S194
Min Nom Max
45 5 55
2
08
b1
20
0 105 70
0 90 60
7
12
11
5
3
9
b55
125
DM74S194
Min Nom Max
4 75 5 5 25
2
08
b1
20
0 105 70
0 90 60
7
12
11
5
3
9
0 70
Units
V
V
V
mA
mA
MHz
MHz
ns
ns
ns
ns
C
Electrical Characteristics over recommended operating free air temperature (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 4)
Max
Units
VI
VOH
Input Clamp Voltage
High Level Output
Voltage
VCC e Min II e b18 mA
b1 2
V
VCC e Min IOH e Max
VIL e Max VIH e Min
DM54
DM74
25
27
34
34
V
VOL Low Level Output
Voltage
VCC e Min IOL e Max
VIH e Min VIL e Max
II
Input Current Max
VCC e Max VI e 5 5V
Input Voltage
05 V
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 5V
IOS Short Circuit
Output Current
VCC e Max
(Note 5)
DM54
DM74
b40
b40
50
b2
b100
b100
mA
mA
mA
ICC Supply Current
VCC e Max (Note 6)
85 135 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 a momentary ground
then 4 5V applied to CLOCK
2


Part Number DM54S194
Description 4-Bit Bidirectional Universal Shift Registers
Maker National Semiconductor
Total Page 6 Pages
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