NSC DM54S194 4-bit bidirectional universal shift register Datasheet

DM54S194/DM74S194
4-Bit Bidirectional Universal Shift Registers
General Description
These bidirectional shift registers are 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-modecontrol 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 flipflops and appear at the outputs after the positive transition
of the clock input. During loading, serial data flow is inhibited.
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 synchronously 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
Y
Y
Y
Y
Y
Parallel inputs and outputs
Four operating modes:
Synchronous parallel load
Right shift
Left shift
Do nothing
Positive edge-triggered clocking
Direct overriding clear
Typical clock frequency 105 MHz
Typical power dissipation 425 mW
Connection Diagram
Dual-In-Line Package
TL/F/6475 – 1
Order Number DM54S194J or DM74S194N
See NS Package Number J16A or N16E
C1995 National Semiconductor Corporation
TL/F/6475
RRD-B30M105/Printed in U. S. A.
DM54S194/DM74S194 4-Bit Bidirectional Universal Shift Registers
June 1989
Absolute Maximum Ratings (Note)
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.
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
b 55§ C to a 125§ C
DM54S
DM74S
0§ C to a 70§ C
b 65§ C to a 150§ C
Storage Temperature Range
Recommended Operating Conditions
Symbol
DM54S194
Parameter
DM74S194
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
0.8
0.8
V
IOH
High Level Output Current
b1
b1
mA
IOL
Low Level Output Current
fCLK
Clock Frequency (Note 1)
fCLK
tW
tSU
2
2
V
20
20
mA
0
105
70
MHz
0
90
60
MHz
0
105
70
Clock Frequency (Note 2)
0
90
60
Pulse Width
(Note 3)
Clock
7
7
Clear
12
12
Mode
11
11
Data
5
5
3
3
Setup Time
(Note 3)
tH
Hold Time (Note 3)
tREL
Clear Release Time (Note 3)
TA
Free Air Operating Temperature
9
ns
ns
ns
9
b 55
125
V
ns
0
70
§C
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.
Electrical Characteristics over recommended operating free air temperature (unless otherwise noted)
Symbol
Parameter
Min
Typ
(Note 4)
DM54
2.5
3.4
DM74
2.7
3.4
Conditions
Max
Units
b 1.2
V
VI
Input Clamp Voltage
VCC e Min, II e b18 mA
VOH
High Level Output
Voltage
VCC e Min, IOH e Max
VIL e Max, VIH e Min
VOL
Low Level Output
Voltage
VCC e Min, IOL e Max
VIH e Min, VIL e Max
II
Input Current @ Max
Input Voltage
VCC e Max, VI e 5.5V
IIH
High Level Input Current
VCC e Max, VI e 2.7V
50
mA
IIL
Low Level Input Current
VCC e Max, VI e 0.5V
b2
mA
IOS
Short Circuit
Output Current
VCC e Max
(Note 5)
Supply Current
VCC e Max (Note 6)
ICC
V
0.5
V
1
mA
DM54
b 40
b 100
DM74
b 40
b 100
85
135
mA
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
Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load)
Symbol
RL e 280X
From (Input)
To (Output)
Parameter
CL e 15 pF
Min
CL e 50 pF
Max
Min
70
Units
Max
fMAX
Maximum Clock Frequency
tPLH
Propagation Delay Time
Low to High Level Output
Clock
to Q
60
MHz
12
15
ns
tPHL
Propagation Delay Time
High to Low Level Output
Clock
to Q
16.5
20
ns
tPHL
Propagation Delay Time
High to Low Level Output
Clear
to Q
18.5
23
ns
Function Table
Inputs
Mode
Clear
L
H
H
H
H
H
H
H
Clock
S1
S0
X
X
H
L
L
H
H
L
X
X
H
H
H
L
L
L
X
L
u
u
u
u
u
X
Outputs
Serial
Parallel
Left
Right
A
B
C
D
X
X
X
X
X
H
L
X
X
X
X
H
L
X
X
X
X
X
a
X
X
X
X
X
X
X
b
X
X
X
X
X
X
X
c
X
X
X
X
X
X
X
d
X
X
X
X
X
QA
QB
QC
QD
L
QA0
a
H
L
QBn
QBn
QA0
L
QB0
b
QAn
QAn
QCn
QCn
QB0
L
QC0
c
QBn
QBn
QDn
QDn
QC0
L
QD0
d
QCn
QCn
H
L
QD0
H e High Level (steady state). L e Low Level (steady state). X e Don’t Care (any input, including transitions).
u e Transition from low to high level.
a, b, c, d e The level of steady state input at inputs A, B, C, or D, respectively.
QA0, QB0, QC0, QD0 e The level of QA, QB, QC, or QD, respectively, before the indicated steady state input conditions were established.
QAn, QBn, QCn, QDn e The level of QA, QB, QC respectively, before the most recent
u transition of the clock.
Logic Diagram
S194
TL/F/6475 – 2
3
Timing Diagram
Typical Clear, Load, Right-Shift, Left-Shift, Inhibit, and Clear Sequences
TL/F/6475 – 3
4
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number DM54S194J
NS Package Number J16A
5
DM54S194/DM74S194 4-Bit Bidirectional Universal Shift Registers
Physical Dimensions inches (millimeters) (Continued)
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74S194N
NS Package Number N16E
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