Page 1
HD74AC195
4-bit Parallel-Access Shift Register
Description
This shift register features parallel inputs, parallel outputs, J-K serial inputs, Shift/Load control input, and a
direct overriding clear. This shift register can operate in two modes: Parallel load; Shift from Q0 towards
Q3.
Parallel loading is accomplished by applying the four bits of data, and taking the PE Input low. The data is
loaded into the associated flip-flops and appears at the outputs after the positive transition of the CP input.
During parallel loading, serial data flow is inhibited. Serial shifting occurs synchronously when the PE
input is high. Serial data for this mode is entered at the J-K inputs. These inputs allow the first stage to
perform as a J-K or toggle flip-flop as shown in the function table.
Features
• Shift Right and Parallel Load Capability
• J-K (D-Type) Inputs to First Stage
• Complement Output from Last Stage
• Asynchronous Master Reset
• Outputs Source/Sink 24 mA
Page 2
HD74AC195
Pin Arrangement
Logic Symbol
MR
D
D1
D2
D3
GND
J
K
0
1
2
3
4
5
6
7
8
J
PE D
(Top view)
0 D1 D2 D3
16
15
14
13
12
11
10
CC
V
Q0
Q1
Q2
Q3
Q3
CP
9
PE
CP
K
MR Q0 Q1 Q2 Q3
Pin Names
CP Clock Pulse Input (Active Rising Edge)
D0 to D
3
PE Parallel Enable Input
MR Asynchronous Master Reset
J, K J-K or D Type Serial Inputs
Q0 to Q3, Q
2
Parallel Data Inputs
Outputs
3
3
Q
Page 3
Timing Diagram
CP
MR
J
K
PE
HD74AC195
D
D1
D2
D3
Q0
Q1
Q2
Q3
0
Serial Shift Serial Shift
H
L
H
L
LoadClear
Mode Select-Function Table
Inputs Outputs
Q
Q
Q
Q
Operating Modes MR CP PE J K D
n
0
1
2
Asynchronous Reset L X XXXXLLL LH
Shift, Set First Stage H HHHXHq0q1q
Shift, Reset First Stage H HLLXLq0q1q
Shift, Toggle First Stage H HHLXq0q0q1q
Shift, Retain First Stage H HLHXq0q0q1q
Parallel Load H LXXdnd0d1d2d
H : HIGH Voltage Level
L : LOW Voltage Level
X : Immaterial
Lower case letters indicate the state of the referenced input (or output) one setup time prior to the LOW-to-
HIGH transition.
: LOW-to-HIGH clock transition.
3
2
2
2
2
3
Q
3
q
2
q
2
q
2
q
2
d
3
3
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HD74AC195
Logic Diagram
D
3 D2 D1 D0
PE
CP
MR
DC Characteristics (unless otherwise specified)
K
VCC J
V
CC
Q0Q1Q2Q3Q3
Item Symbol Max Unit Condition
Maximum quiescent supply current I
CC
80 µAV
= VCC or ground, VCC = 5.5 V,
IN
Ta = Worst case
Maximum quiescent supply current I
CC
8.0 µAV
= VCC or ground, VCC = 5.5 V,
IN
Ta = 25°C
4
Page 5
AC Characteristics: HD74AC195
HD74AC195
Item Symbol V
Maximum clock f
max
Ta = +25°C
C
= 50 pF
L
(V)*1Min Typ Max Min Max Unit
CC
3.3 75 — — 65 — MHz
Ta = –40°C to +85°C
CL = 50 pF
frequency 5.0 100 — — 85 —
Propagation delay t
CP to Qn or Q
3
Propagation delay t
CP to Qn or Q
2
Propagation delay t
MR to Q
2
Propagaion delay t
MR to Q
n
PLH
PHL
PLH
PHL
3.3 1.0 9.0 13.0 1.0 15.0 ns
5.0 1.0 5.5 10.0 1.0 11.5
3.3 1.0 9.0 13.0 1.0 15.0 ns
5.0 1.0 6.5 10.0 1.0 11.5
3.3 1.0 7.5 10.5 1.0 12.0 ns
5.0 1.0 5.5 8.0 1.0 9.5
3.3 1.0 6.0 9.0 1.0 10.5 ns
5.0 1.0 5.0 7.0 1.0 8.0
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
AC Operating Requirements: HD74AC195
Ta = –40°C
Ta = +25°C
C
= 50 pF
L
Item Symbol V
Setup time, HIGH or LOW t
su
(V)*1Typ Guaranteed Minimum Unit
CC
3.3 3.0 5.5 7.0 ns
J, K or Dn to CP 5.0 2.0 4.0 5.0
Hold time, HIGH or LOW t
h
3.3 –0.5 2.0 3.6 ns
J, K or Dn to CP 5.0 0.5 1.5 2.0
Setup time, HIGH or LOW t
su
3.3 3.5 5.0 7.0 ns
PE to CP 5.0 2.5 4.0 5.0
Hold time, HIGH or LOW t
h
3.3 –2.0 0.0 0.0 ns
PE to CP 5.0 –1.5 0.0 0.0
Recovery time t
rec
3.3 –1.5 0.5 0.5 ns
MR to CP 5.0 –1.0 0.5 0.5
Pulse width t
w
3.3 –3.0 5.5 7.0 ns
5.0 –3.0 4.5 5.0
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
to +85°C
CL = 50 pF
5
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HD74AC195
Capacitance
Item Symbol Typ Unit Condition
Input capacitance C
Power dissipation capacitance C
IN
PD
4.5 pF VCC = 5.5 V
125 pF VCC = 5.0 V
6
Page 7
19.20
20.00 Max
16 9
1.3
Unit: mm
6.30
7.40 Max
81
1.11 Max
2.54 ± 0.25
0.48 ± 0.10
5.06 Max
2.54 Min
0.51 Min
Hitachi Code
JEDEC
EIAJ
Weight
7.62
+ 0.13
0.25
– 0.05
0° – 15°
(reference value)
DP-16
Conforms
Conforms
1.07 g
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16
Unit: mm
10.06
10.5 Max
9
5.5
1
0.80 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.12
0.10 ± 0.10
0.15
M
2.20 Max
7.80
0.20 ± 0.04
*0.22 ± 0.05
0.70 ± 0.20
Hitachi Code
JEDEC
EIAJ
(reference value)
Weight
+ 0.20
– 0.30
1.15
0° – 8°
FP-16DA
—
Conforms
0.24 g
Page 9
16
Unit: mm
9.9
10.3 Max
9
1
1.27
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.25
+ 0.11
– 0.04
0.14
0.15
3.95
1.75 Max
M
6.10
1.08
0.20 ± 0.03
*0.22 ± 0.03
+ 0.67
0.60
– 0.20
Hitachi Code
JEDEC
EIAJ
Weight
+ 0.10
– 0.30
0° – 8°
(reference value)
FP-16DN
Conforms
Conforms
0.15 g
Page 10
16 9
18
+ 0.08
*0.22
– 0.07
0.20 ± 0.06
5.00
5.30 Max
0.65 Max
0.65
0.13
Unit: mm
4.40
1.0
M
6.40 ± 0.20
0.10
1.10 Max
*Dimension including the plating thickness
Base material dimension
0.15 ± 0.04
*0.17 ± 0.05
+0.03
–0.04
0.07
0° – 8°
Hitachi Code
JEDEC
EIAJ
(reference value)
Weight
0.50 ± 0.10
TTP-16DA
—
—
0.05 g
Page 11
Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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