參數(shù)資料
型號(hào): 74221
廠商: Texas Instruments, Inc.
英文描述: High Speed CMOS Logic Dual Monostable Multivibrator with Reset
中文描述: 高速CMOS邏輯雙單穩(wěn)態(tài)觸發(fā)器的復(fù)位
文件頁數(shù): 15/15頁
文件大小: 250K
代理商: 74221
December 1990
15
Philips Semiconductors
Product specification
Dual non-retriggerable monostable
multivibrator with reset
74HC/HCT221
Fig.15 Typical output pulse width as a function of
temperature; C
X
= 0.1
μ
F; R
X
= 10 K
;
V
CC
= 5 V.
Fig.16 k factor as a function of supply voltage;
R
X
= 10 K
; T
amb
= 25
°
C.
Power-down consideration
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 substain 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.17.
Fig.17 Power-down protection circuit.
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
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