參數(shù)資料
型號(hào): 74HCT4538
廠商: NXP Semiconductors N.V.
英文描述: Dual retriggerable precision monostable multivibrator
中文描述: 雙retriggerable精密單穩(wěn)態(tài)觸發(fā)器
文件頁數(shù): 11/13頁
文件大小: 149K
代理商: 74HCT4538
September 1993
11
Philips Semiconductors
Product specification
Dual retriggerable precision monostable
multivibrator
74HC/HCT4538
Fig.11 Power-down protection circuit.
Power-down considerations
A large capacitor (C
X
) 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 V
CC
to zero occurs,
the monostable may sustain damage, due to the capacitor
discharging through the input protection diodes. To avoid
this possibility, use a damping diode (D
X
) preferably a
germanium or Schottky type diode able to withstand large
current surges and connect as shown in Fig.11.
Fig.12 Typical pulse width accuracy versus external capacitance; V
CC
= 4.5 V; T
amb
= 25
°
C.
Fig.13 Typical pulse width accuracy versus external resistance; V
CC
= 4.5 V; T
amb
= 25
°
C.
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