HD74HC4538 Datasheet, PDF (6/16 Pages) Hitachi Semiconductor – Dual Precision Retriggerable/Resettable Monostable Multivibrators

HD74HC4538
AC Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Symbol
Propagation delay t_PLH
time
V_CC (V)
2.0
4.5
Min Typ Max Min
— — 235 —
— 22 47 —
Max Unit
295 ns
59
Test Conditions
A or B to Q
6.0
— — 40 — 50
t _PHL
2.0
— — 260 — 325 ns A or B to Q
4.5
— 23 52 — 65
6.0
— — 44 — 55
t _PHL
2.0
— — 235 — 295 ns C_D to Q
4.5
— 17 47 — 59
6.0
— — 40 — 50
t _PLH
2.0
— — 235 — 295 ns C_D to Q
4.5
— — 47 — 59
6.0
— — 40 — 50
Pulse width
t_w
2.0
80 — — 100 — ns A, B, C_D
4.5
16 — — 20 —
6.0
14 — — 17 —
Output pulse width t_WQ
3.0
— 150 — — — ns R_X = 1 kΩ, C_X = 12 pF
5.0
— 100 — — —
3.0
— — — — — µs R_X = 10 kΩ, C_X = 100 pF
5.0
— 1.3 — — —
3.0
— — — — — µs R_X = 10 kΩ, C_X = 1000 pF
5.0
—9 — — —
3.0
— — — — — µs R_X = 10 kΩ, C_X = 10000 pF
5.0
— 70 — — —
Pulse width match ∆t_WQ
between circuits in
the same package
5.0
— ±0.1 — — — % R_X = 10 kΩ, C_X = 1000 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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