HD74HC221 Datasheet, PDF (4/8 Pages) Hitachi Semiconductor – Dual Monostable Multivibrators (with Schmitt Trigger Input)

HD74HC221
AC Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Trigger
propagation delay
Symbol
t _PLH
V_CC (V)
2.0
4.5
Min Typ Max Min
— — 210 —
— — 42 —
Max Unit
265 ns
53
Test Conditions
A, B or Clear to Q
time
6.0
— — 36 — 45
t _PHL
2.0
— — 240 — 300 ns A, B or Clear to Q
4.5
— — 48 — 60
6.0
— — 41 — 51
Propagation delay t_PHL
time
2.0
— — 170 — 215 ns Clear to Q
4.5
— — 34 — 43
6.0
— — 29 — 37
t _PLH
2.0
— — 180 — 225 ns Clear to Q
4.5
— — 36 — 45
6.0
— — 31 — 38
Pulse width
t_w
2.0
80 — — 100 — ns A, B, Clear
4.5
16 — — 20 —
6.0
14 — — 17 —
Minimum output t_{WQ (min)} 2.0
pulse width
4.5
— 1.5 — — — µs Cext = 28 pF Rext = 6 kΩ
— 450 — — — ns
Rext = 2 kΩ
6.0
— 380 — — —
Output pulse width t_WQ
4.5
0.63 0.7 0.77 — — ms Cext = 0.1 µF
Rext = 10 kΩ
Output rise/fall
t _TLH
time
t _THL
2.0
— — 75 — 95 ns
4.5
— — 15 — 19
6.0
— — 13 — 16
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_CC and GND, and keep the wiring between the external components
and Cext, Rext/Cext pins as short as possible.
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