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HD74HC123A Datasheet, PDF (6/8 Pages) Hitachi Semiconductor – Dual Retriggerable Monostable Multivibrators (with Clear) | |||
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HD74HC123A
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Ta = â40 to
+85°C
Item
Symbol
Propagation delay tPLH
time
VCC (V)
2.0
4.5
Min Typ Max Min
â â 210 â
â 22 42 â
Max Unit
265 ns
53
Test Conditions
A, B or Clear to Q
6.0
â â 36 â 45
t PHL
2.0
â â 240 â 300 ns A, B or Clear to Q
4.5
â 23 48 â 60
6.0
â â 41 â 51
t PHL
2.0
â â 170 â 215 ns Clear to Q
4.5
â 18 34 â 43
6.0
â â 29 â 37
t PLH
2.0
â â 180 â 225 ns Clear to Q
4.5
â 16 36 â 45
6.0
â â 31 â 38
Output rise time tTLH
2.0
â â 75 â 95 ns
4.5
â 5 15 â 19
6.0
â â 13 â 16
Output fall time tTHL
2.0
â â 75 â 95 ns
4.5
â 5 15 â 19
6.0
â â 13 â 16
Pulse width
tw
2.0
150 â â 190 â ns A, B, Clear
4.5
30 6 â 38 â
6.0
26 â â 33 â
Minimum output tWQ(min)
2.0
pulse width
4.5
â 1.5 â â â µs Cext = 28 pF Rext = 6 kâ¦
â 450 â â â ns
Rext = 2 kâ¦
6.0
â 380 â â â
Output pulse width tWQ
Input capacitance Cin
4.5
â 1.0 â â â ms Cext = 0.1 µF, Rext = 10 kâ¦
â
â 5 10 â 10 pF
Caution in use: In order to prevent any malfunctions due to noise, connect a high-frequency performance
capacitor between VCC and GND, and keep the wiring between the External components
and Cext, Rext/Cext pins as short as possible.
4
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