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DM54S195 Datasheet

4-Bit Parallel Access Shift Registers

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June 1989
DM54S195 DM74S195 4-Bit Parallel Access
Shift Registers
General Description
These 4-bit registers feature parallel inputs parallel outputs
J-K serial inputs shift load control input and a direct over-
riding clear All inputs are buffered to lower the input drive
requirements The registers have two modes of operation
Parallel (broadside) load
Shift (in the direction QA toward QD)
Parallel loading is accomplished by applying the four bits of
data and taking the shift load control input low The data is
loaded into the associated flip-flop and appears at the out-
puts after the positive transition of the clock input During
loading serial data flow is inhibited
Shifting is accomplished synchronously when the shift load
control input is high Serial data for this mode is entered at
the J-K inputs These inputs permit the first stage to perform
as a J-K D or T-type flip-flop as shown in the truth table
The high-performance S195 with a 105 MHz typical shift
frequency is particularly attractive for very high-speed data
processing systems In most cases existing systems can be
upgraded merely by using this Schottky-clamped shift regis-
ter
Features
Y Synchronous parallel load
Y Positive-edge-triggered clocking
Y Parallel inputs and outputs from each flip-flop
Y Direct overriding clear
Y J and K inputs to first stage
Y Complementary outputs from last stage
Y For use in high-performance
accumulators processors
serial-to-parallel parallel-to-serial converters
Y Typical clock frequency 105 MHz
Y Typical power dissipation 350 mW
Connection Diagram
Dual-In-Line Package
Order Number DM54S195J or DM74S195N
See NS Package Number J16A or N16E
TL F 6476 – 1
C1995 National Semiconductor Corporation TL F 6476
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

DM54S195 Datasheet

4-Bit Parallel Access 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 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)
fCLK
Clock Frequency (Note 2)
tW Pulse Width
(Note 3)
Clock
Clear
tSU Setup Time
(Note 3)
Shift Load
Data
tH Data Hold Time (Note 3)
tREL Shift Load Release Time (Note 3)
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
Min
45
2
0
0
7
12
11
5
3
6
9
b55
DM54S195
Nom
5
105
90
Max
55
08
b1
20
70
60
125
DM74S195
Min Nom Max
4 75 5 5 25
2
08
b1
20
0 105 70
0 90 60
7
12
11
5
3
6
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)
70 109 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 inputs open SHIFT LOAD grounded and 4 5V applied to the J K and data inputs ICC is measured by applying a momentary ground then 4 5V to
the CLEAR and then applying a momentary ground then 4 5V to the CLOCK
2


Part Number DM54S195
Description 4-Bit Parallel Access Shift Registers
Maker National Semiconductor
Total Page 6 Pages
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