74hct221 NXP Semiconductors, 74hct221 Datasheet - Page 15

• Manufacturer Part Number: 74hct221
• Description: Dual Non-retriggerable Monostable Multivibrator With Reset
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Power-down consideration
A large capacitor (C
powering-down the monostable due to the energy stored
in this capacitor. When a system containing this device is
powered-down or a rapid decrease of V
the monostable may substain damage, due to the
capacitor discharging through the input protection diodes.
To avoid this possibility, use a damping diode (D
preferably a germanium or Schottky type diode able to
withstand large current surges and connect as shown in
Fig.17.
December 1990
Dual non-retriggerable monostable
multivibrator with reset
Fig.15 Typical output pulse width as a function of
Fig.17 Power-down protection circuit.
temperature; C
V
CC
= 5 V.
X
) may cause problems when
X
= 0.1 F; R
X
CC
= 10 K ;
to zero occurs,
X
)
15
PACKAGE OUTLINES
See
Fig.16 k factor as a function of supply voltage;
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
R
X
= 10 K ; T
amb
= 25 C.
74HC/HCT221
Product specification
.