HD74HC423A Datasheet, PDF (4/9 Pages) Hitachi Semiconductor – Dual Retriggerable Monostable Multivibrators

HD74HC423A
Switching Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Ta = 25°C
Ta = –40 to +85°C
Item
Symbol VCC (V) Min Typ Max Min
Max Unit
Test Conditions
Propagation delay tPLH
time
2.0
— — 210
—
4.5 — 20 42
—
265 ns A or B to Q
53
6.0 — — 36
—
45
tPHL
2.0
— — 240
—
4.5 — 21 48
—
300 ns A or B to Q
60
6.0 — — 41
—
51
tPHL
2.0
— — 170
—
215 ns Clear to Q
4.5 — 17 34
—
43
6.0 — — 29
—
37
tPLH
2.0
— — 180
—
4.5 — 15 36
—
225 ns Clear to Q
45
6.0 — — 31
—
38
Pulse width
tw
2.0 150 — —
190
—
ns A, B, Clear
4.5 30 6 —
38
—
6.0 26 — —
33
—
Removal time
trem
2.0
0
——
5
4.5
0 –3 —
5
—
ns Clear
—
6.0
0
——
5
—
Minimum output
tWQ (min)
2.0
— 1.5 —
—
pulse width
4.5 — 450 —
—
—
µs Cext = 28 pF Rext = 6 kΩ
—
ns
Rext = 2 kΩ
6.0 — 380 —
—
—
Output pulse width tWQ
4.5 — 1.0 —
—
Output rise/fall
tTLH
2.0 — — 75
—
time
tTHL
4.5 — 5 15
—
—
ms Cext = 0.1 µF, Rext = 10 kΩ
95
ns
19
6.0 — — 13
—
16
Input capacitance Cin
—
— — 20
—
20
pF Pins 7 & 15
—
— 5 10
—
10
Other pins
Caution in use: In order to prevent any malfunctions due to noise, connect a highfrequency performance capacitor
between VCC and GND, and keep the wiring between the external components and Cext, Rext/Cext pins
as short as possible.
Test Circuit
Measurement point
C_L*
Note: C_L includes the probe and fig capacitance.
Rev.2.00 Mar 30, 2006 page 4 of 8