參數(shù)資料
型號(hào)： 74HC423DB
廠商： NXP SEMICONDUCTORS
元件分類： 諧振器
英文描述： Dual retriggerable monostable multivibrator with reset
中文描述： HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16
文件頁(yè)數(shù)： 2/14頁(yè)
文件大?。?/td> 103K
代理商： 74HC423DB
1998 Jul 08
2
Philips Semiconductors
Product specification
Dual retriggerable monostable
multivibrator with reset
74HC/HCT423
FEATURES
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100% duty
factor
Direct reset terminates output pulse
Schmitt-trigger action on all inputs except for the reset
input
Output capability: standard (except for nR
EXT
/C
EXT
)
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT423 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT423 are dual retriggerable monostable
multivibrators with output pulse width control by two
methods. The basic pulse time is programmed by
selection of an external resistor (R
EXT
) and capacitor
(C
EXT
). The external resistor and capacitor are normally
connected as shown in Fig.6.
Once triggered, the basic output pulse width may be
extended by retriggering the gated active LOW-going edge
input (nA) or the active HIGH-going edge input (nB). By
repeating this process, the output pulse period
(nQ = HIGH, nQ = LOW) can be made as long as desired.
When nR
D
is LOW, it forces the nQ output LOW, the
nQ output HIGH and also inhibits the triggering.
Figures 7 and 8 illustrate pulse control by reset. The basic
output pulse width is essentially determined by the values
of the external timing components R
EXT
and C
EXT
.
For pulse widths, when C
EXT
<
10 000 pF, see Fig.9.
When C
EXT
>
10 000 pF, the typical output pulse width is
defined as:
t
W
= 0.45
×
R
EXT
×
C
EXT
(typ.),
where, t
W
= pulse width in ns;
R
EXT
= external resistor in k
;
C
EXT
= external capacitor in pF.
Schmitt-trigger action in the nA and nB inputs, makes the
circuit highly tolerant to slower input rise and fall times.
The “423” is identical to the “123” but cannot be triggered
via the reset input.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
)
+
0.75
×
C
EXT
×
V
CC2
×
f
o
+
D
×
16
×
V
CC
where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
D = duty factor in %
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
C
EXT
= timing capacitance in pF
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLH
propagation delay
nA, nB to nQ, nQ
nR
D
to nQ, nQ
input capacitance
minimum output pulse width nQ, nQ
C
L
= 15 pF; V
CC
= 5 V;
R
EXT
= 5 k
; C
EXT
= 0 pF
25
20
3.5
75
26
22
3.5
75
ns
ns
pF
ns
C
I
t
W
notes 1 and 2
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