參數(shù)資料
型號: 933669510652
廠商: NXP SEMICONDUCTORS
元件分類: 諧振器
英文描述: HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDIP16
封裝: SOT-38-1, DIP-16
文件頁數(shù): 7/19頁
文件大?。?/td> 332K
代理商: 933669510652
December 1990
15
Philips Semiconductors
Product specication
Dual non-retriggerable monostable
multivibrator with reset
74HC/HCT221
Fig.15 Typical output pulse width as a function of
temperature; CX = 0.1 F; RX =10K;
VCC =5V.
Fig.16 k factor as a function of supply voltage;
RX =10K;Tamb =25 °C.
Power-down consideration
A large capacitor (CX) may cause problems when
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 VCC to zero occurs,
the monostable may substain damage, due to the
capacitor discharging through the input protection diodes.
To avoid this possibility, use a damping diode (DX)
preferably a germanium or Schottky type diode able to
withstand large current surges and connect as shown in
Fig.17.
Fig.17 Power-down protection circuit.
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”.
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