HITACHI HD74HC123

HD74HC123A
Dual Retriggerable Monostable Multivibrators (with Clear)
Description
This multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which
can be used as an inhibit input. Also included is a clear input that when taken low resets the one shot. The
HD74HC123A can be triggered on the positive transition of the clear while A is held low and B is held
high.
The HD74HC123A is retriggerable. That is it may be triggered repeatedly while their outputs are
generating a pulse and the pulse will be extended.
Pulse width stability over a wide range of temperature. The output pulse equation is simply: t w = (Rext)
(Cext).
Features
•
•
•
•
•
High Speed Operation
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current
Function Table
Inputs
Outputs
Clear
A
B
Q
Q
L
X
X
L
H
X
H
X
L
H
X
X
L
L
H
H
L
H
H
L
H
Note: External timing capacitance connects between Cext and Rext/Cext.
HD74HC123A
Pin Arrangement
1A
1
16 VCC
1B
2
15 1Rext
Cext
1CLR
3
1Q
4
13 1Q
2Q
5
12 2Q
2Cext
6
2Rext/
Cext
7
10 2B
GND
8
9
CLR
Q
Q
Q
Q
CLR
(Top view)
2
14 1Cext
11 2CLR
2A
HD74HC123A
DC Characteristics
Ta = –40
to +85°C
Sym-
VCC
Ta = 25°C
Item
bol
(V)
Min Typ Max Min Max Unit Test Conditions
Input voltage
VIH
2.0
1.5
—
—
1.5
4.5
3.15 —
—
3.15 —
6.0
4.2
—
—
4.2
—
2.0
—
—
0.5
—
0.5
4.5
—
—
1.35 —
1.35
6.0
—
—
1.8
—
1.8
2.0
1.9
2.0
—
1.9
—
4.5
4.4
4.5
—
4.4
—
6.0
5.9
6.0
—
5.9
—
4.5
4.18 —
—
4.13 —
IOH = –4 mA
6.0
5.68 —
—
5.63 —
IOH = –5.2 mA
2.0
—
0.0
0.1
—
0.1
4.5
—
0.0
0.1
—
0.1
6.0
—
0.0
0.1
—
0.1
4.5
—
—
0.26 —
0.33
IOL = 4 mA
6.0
—
—
0.26 —
0.33
IOL = 5.2 mA
Iin
6.0
—
—
±0.1 —
±1.0 µA
Vin = VCC or GND
ICC
6.0
—
—
130
—
220 µA
Vin = VCC or
Iout = 0 µA
—
—
130
—
220
GND
Rext/Cext = 0.5 VCC
VIL
Output voltage
VOH
VOL
Input current
Quiescent
Standby state
supply current
Active state
—
V
V
V
V
Vin = VIH or VIL IOH = –20 µA
Vin = VIH or VIL IOL = 20 µA
3
HD74HC123A
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
+85°C
Ta = 25°C
VCC (V) Min Typ Max Min
Max
Unit
Test Conditions
Propagation delay t PLH
2.0
—
—
210 —
265
ns
A, B or Clear to Q
time
4.5
—
22
42
—
53
6.0
—
—
36
—
45
2.0
—
—
240 —
300
ns
A, B or Clear to Q
4.5
—
23
48
—
60
6.0
—
—
41
—
51
2.0
—
—
170 —
215
ns
Clear to Q
4.5
—
18
34
—
43
6.0
—
—
29
—
37
2.0
—
—
180 —
225
ns
Clear to Q
4.5
—
16
36
—
45
6.0
—
—
31
—
38
2.0
—
—
75
—
95
4.5
—
5
15
—
19
6.0
—
—
13
—
16
2.0
—
—
75
—
95
4.5
—
5
15
—
19
6.0
—
—
13
—
16
2.0
150 —
—
190
—
4.5
30
6
—
38
—
6.0
26
—
—
33
—
2.0
—
1.5 —
—
4.5
—
450 —
6.0
—
Output pulse width t WQ
4.5
Input capacitance
—
Item
Symbol
t PHL
t PHL
t PLH
Output rise time
Output fall time
Pulse width
Minimum output
t TLH
t THL
tw
t WQ(min)
pulse width
Caution in use:
4
Cin
ns
ns
ns
A, B, Clear
—
µs
Cext = 28 pF
—
—
ns
Rext = 2 kΩ
380 —
—
—
—
1.0 —
—
—
ms
Cext = 0.1 µF, Rext = 10 kΩ
—
5
—
10
pF
10
Rext = 6 kΩ
In order to prevent any malfunctions due to noise, connect a high-frequency performance
capacitor between V CC and GND, and keep the wiring between the External components
and Cext, Rext/Cext pins as short as possible.
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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