HITACHI HD74AC123A

HD74AC123A
Dual Retriggerable Resettable Multivibrator
Description
Each half of the HD74AC123A features retriggerable capability, complementary dc level triggering and
overriding Direct Clear. When a circuit is in the quasi-stable (delay) state, another trigger applied to the
inputs (per the Truth Table) will cause the delay period to start again, without disturbing the outputs. By
repeating this process, the output pulse period (Q High, Q Low) can be made as long as desired.
Alternatively, a delay period can be terminated at any time by a Low signal on C D, which also inhibits
triggering. An internal connection from C D to the input gate makes it possible to trigger the circuit by a
positive-going signal on C D, as shown in the Truth Table. For timing capacitor values greater than 1000
pF, the output pulse width is defined as follows.
Where tw is in ns, RX is in k and C
tw = RXCX
Feature
• Outputs Source/Sink 24 mA
X
is in pF.
HD74AC123A
Pin Arrangement
A1 1
16 VCC
B1 2
15 RX1CX1
CD1 3
14 CX1
Q1 4
13 Q1
Q2 5
12 Q2
CX2 6
11 CD2
RX2CX2 7
10 B2
GND 8
9 A2
(Top view)
Logic Symbol
7 6
(15) (14)
RXCX
CX
Q
5(13)
Q
12(4)
9(1) A
10(2)
B
CD
11
(3)
VCC = Pin16
GND = Pin8
2
HD74AC123A
Pin Names
A1, A 2
B 1, B 2
C D1, CD2
Q1, Q2
Q1, Q 2
Trigger Inputs (Active Falling Edge)
Trigger Inputs (Active Rising Edge)
Direct Clear Inputs (Active Low)
Positive Pulse Outputs
Negative Pulse Outputs
Triggering Truth Table
Inputs
A
B
CD
Response
X
X
L
No trigger
L
X
No trigger
H
H
Trigger
H
X
No trigger
L
H
Trigger
L
H
H :
L :
X :
Trigger
High Voltage Level
Low Voltage Level
Immaterial
:
Low-to-High Transition
:
High-to-Low Transition
DC Characteristics (unless otherwise specified)
Item
Symbol
Max
Unit
Condition
Maximum quiescent supply current
I CC
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
I CC
8.0
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
3
HD74AC123A
AC Characteristics: HD74AC123A
Ta = –40°C
to +85°C
CL = 50 pF
Ta = +25°C
CL = 50 pF
Item
Symbol
VCC (V)*1 Min
Typ
Max
Min
Max
Unit
Condition
Propagation delay
t PLH
3.3
1.0
—
19.0
1.0
22.0
ns
Cext = 0 pF
5.0
1.0
—
15.0
1.0
17.0
3.3
1.0
—
19.0
1.0
22.0
5.0
1.0
—
15.0
1.0
17.0
3.3
1.0
—
15.0
1.0
18.0
5.0
1.0
—
12.0
1.0
13.5
3.3
1.0
—
15.0
1.0
18.0
5.0
1.0
—
12.0
1.0
13.5
A or B to Q
Propagation delay
t PHL
A or B to Q
Propagation delay
t PLH
CDn to Q
Propagation delay
t PHL
CDn to Q
Note:
Rest = 5 kΩ
ns
ns
ns
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: HD74AC123A
Ta = –40
to +85°C
CL = 50 pF
Ta = +25°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Typ
Guaranteed Minimum
Unit
Condition
Pulse width
tw
3.3
—
5.0
7.0
ns
Cext = 0 pF
5.0
—
4.5
5.0
3.3
—
2.0
2.0
5.0
—
2.0
2.0
A or B or CDn
Recovery time
CDn to A or B
Note:
4
t rec
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Rext = 5 kΩ
ns
HD74AC123A
Ta = –40°C
to +85°C
CL = 50 pF
Ta = +25°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Condition
Output pulse width
TWQ
3.3
—
—
—
—
—
ms
Cext = 0.1 µF
5.0
0.90
—
1.10
0.85
1.15
3.3
190
—
350
170
380
5.0
160
—
300
140
330
Minimum output
pulse width
TWQ(min)
Rext = 10 kΩ
ns
Cext = 28 pF
Rext = 2 kΩ
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Cext and Rext should be connected as close to the IC terminals as possible, in order to prevent malfunction.
Note:
5
Unit: mm
19.20
20.00 Max
1
7.40 Max
9
6.30
16
8
1.3
0.48 ± 0.10
2.54 Min 5.06 Max
2.54 ± 0.25
0.51 Min
1.11 Max
7.62
+ 0.13
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
16
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DA
—
Conforms
0.24 g
Unit: mm
9.9
10.3 Max
9
1
8
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
0.15
*0.22 ± 0.03
0.20 ± 0.03
1.27
0.11
0.14 +– 0.04
1.75 Max
3.95
16
0.10
6.10 +– 0.30
1.08
0° – 8°
0.67
0.60 +– 0.20
0.25 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DN
Conforms
Conforms
0.15 g
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,
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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