Page 1
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: tw = (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
LXXLH
XHXLH
XX L L H
HL
H H
LH
Note: External timing capacitance connects between Cext and Rext/Cext.
Page 2
HD74HC123A
Pin Arrangement
1A
2Rext/
Cext
1
21B
31CLR
41Q
52Q
62Cext
7
8GND
CLR
Q Q
QQ
CLR
(Top view)
16
15
V
CC
1Rext
Cext
1Cext14
1Q13
2Q12
2CLR11
2B10
2A9
2
Page 3
HD74HC123A
DC Characteristics
Ta = –40
Sym- VCCTa = 25°C
Item bol (V) Min Typ Max Min Max Unit Test Conditions
Input voltage V
2.0 1.5 — — 1.5 — V
IH
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
2.0 — — 0.5 — 0.5 V
IL
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Output voltage V
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
OH
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
V
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
OL
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
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent Standby state I
6.0 — — 130 — 220 µA Vin = VCC or Iout = 0 µA
CC
supply current Active state — — 130 — 220 GND Rext/Cext = 0.5 V
to +85°C
CC
3
Page 4
HD74HC123A
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol V
Propagation delay t
PLH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 210 — 265 ns A, B or Clear to Q
time 4.5 — 22 42 — 53
6.0 — — 36 — 45
t
PHL
2.0 — — 240 — 300 ns A, B or Clear to Q
4.5 — 23 48 — 60
6.0 — — 41 — 51
t
PHL
2.0 — — 170 — 215 ns Clear to Q
4.5 — 18 34 — 43
6.0 — — 29 — 37
t
PLH
2.0 — — 180 — 225 ns Clear to Q
4.5 — 16 36 — 45
6.0 — — 31 — 38
Output rise time t
TLH
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Output fall time t
THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Pulse width t
w
2.0 150 — — 190 — ns A, B, Clear
4.5 30 6 — 38 —
6.0 26 — — 33 —
Minimum output t
WQ(min)
2.0 — 1.5 — — — µs Cext = 28 pF Rext = 6 kΩ
pulse width 4.5 — 450 — — — ns Rext = 2 kΩ
6.0 — 380 — — —
Output pulse width t
WQ
4.5 — 1.0 — — — ms Cext = 0.1 µF, Rext = 10 kΩ
Input capacitance Cin — — 5 10 — 10 pF
Caution in use: In order to prevent any malfunctions due to noise, connect a high-frequency performance
capacitor between V
and GND, and keep the wiring between the External components
CC
and Cext, Rext/Cext pins as short as possible.
+85°C
4
Page 5
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
Page 6
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 7
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
0.60
Hitachi Code
JEDEC
EIAJ
Weight
+ 0.10
– 0.30
0° – 8°
+ 0.67
– 0.20
(reference value)
FP-16DN
Conforms
Conforms
0.15 g
Page 8
Cautions
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received the latest product standards or specifications before final design, purchase or use.
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of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
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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
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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
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products.
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