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74HC423 Schematic ( PDF Datasheet ) - Philips

Teilenummer 74HC423
Beschreibung Dual retriggerable monostable multivibrator with reset
Hersteller Philips
Logo Philips Logo 




Gesamt 24 Seiten
74HC423 Datasheet, Funktion
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
Rev. 6 — 19 December 2011
Product data sheet
1. General description
74HC423; 74HCT423 are high-speed Si-gate CMOS devices that are pin compatible with
Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC423; 74HCT423 dual retriggerable monostable multivibrator with reset has two
methods of output pulse width control.
1. The minimum pulse width is essentially determined by the selection of an external
resistor (REXT) and capacitor (CEXT), see Section 12.1.
2. 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 nRD is LOW, it forces the nQ output LOW, the nQ output
HIGH and also inhibits the triggering. Figure 10 and Figure 11 illustrate pulse control
by reset.
The nA and nB inputs’ Schmitt trigger action makes them highly tolerant to slower input
rise and fall times.
The 74HC423; 74HCT423 are identical to the 74HC123; 74HCT123 except that they
cannot be triggered via the reset input.
2. Features and benefits
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
Complies with JEDEC standard no. 7A
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Specified from 40 C to +85 C and from 40 C to +125 C






74HC423 Datasheet, Funktion
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
8. Recommended operating conditions
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
VCC
VI
VO
Tamb
t/V
supply voltage
input voltage
output voltage
ambient temperature
input transition rise
and fall rate
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
9. Static characteristics
74HC423
Min Typ Max
2.0 5.0 6.0
0 - VCC
0 - VCC
40 - +125
- - 625
- 1.67 139
- - 83
74HCT423
Min Typ Max
4.5 5.0 5.5
0 - VCC
0 - VCC
40 - +125
---
- 1.67 139
---
Unit
V
V
V
C
ns/V
ns/V
ns/V
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
25 C
74HC423
VIH HIGH-level
input voltage
VIL LOW-level
input voltage
VOH HIGH-level
output voltage
VOL LOW-level
output voltage
II input leakage
current
ICC supply current
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
VI = VIH or VIL
IO = 20 A; VCC = 2.0 V
IO = 20 A; VCC = 4.5 V
IO = 20 A; VCC = 6.0 V
IO = 4.0 mA; VCC = 4.5 V
IO = 5.2 mA; VCC = 6.0 V
VI = VIH or VIL
IO = 20 A; VCC = 2.0 V
IO = 20 A; VCC = 4.5 V
IO = 20 A; VCC = 6.0 V
IO = 4.0 mA; VCC = 4.5 V
IO = 5.2 mA; VCC = 6.0 V
VI = VCC or GND; VCC = 6.0 V
VI = VCC or GND; IO = 0 A;
VCC = 6.0 V
Min Typ Max
1.5 1.2 -
3.15 2.4 -
4.2 3.2 -
- 0.8 0.5
- 2.1 1.35
- 2.8 1.8
1.9 2.0
4.4 4.5
5.9 6.0
3.98 4.32
5.48 5.81
-
-
-
-
-
- 0 0.1
- 0 0.1
- 0 0.1
- 0.15 0.26
- 0.16 0.26
- - 0.1
- - 8.0
40 C to
+85 C
Min Max
1.5 -
3.15 -
4.2 -
- 0.5
- 1.35
- 1.8
1.9 -
4.4 -
5.9 -
3.84 -
5.34 -
- 0.1
- 0.1
- 0.1
- 0.33
- 0.33
- 1.0
- 80
40 C to Unit
+125 C
Min Max
1.5 - V
3.15 - V
4.2 - V
- 0.5 V
- 1.35 V
- 1.8 V
1.9 - V
4.4 - V
5.9 - V
3.7 - V
5.2 - V
- 0.1 V
- 0.1 V
- 0.1 V
- 0.4 V
- 0.4 V
- 1.0 A
- 160 A
74HC_HCT423
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 19 December 2011
© NXP B.V. 2011. All rights reserved.
6 of 24

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74HC423 pdf, datenblatt
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
106
tW
(ns)
105
104
103
102
001aaa611
(1)
(2)
(3)
(4)
0.8
'K' factor
0.6
0.4
0.2
001aaa612
10
1
10 102 103 104
CEXT (pF)
0
02468
VCC (V)
VCC = 5.0 V and Tamb = 25 C.
(1) REXT = 100 k.
(2) REXT = 50 k.
(3) REXT = 10 k.
(4) REXT = 2 k.
Fig 8. Typical output pulse width as a function of the
external capacitor values
External capacitance = 10 nF,
external resistance = 10 kto 100 kand Tamb = 25 C.
Fig 9. Typical ‘K’ factor
nB input
tW
nA input
trtrig
nQ output
tW
nRD = HIGH.
Fig 10. Output pulse control using retrigger pulse (trtrig)
tW
tW
tW
mna521
74HC_HCT423
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 19 December 2011
© NXP B.V. 2011. All rights reserved.
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