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PDF ( 数据手册 , 数据表 ) 74HC423

零件编号 74HC423
描述 Dual retriggerable monostable multivibrator
制造商 NXP Semiconductors
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74HC423 数据手册, 描述, 功能
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 pdf, 数据表
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
10. Dynamic characteristics
Table 7. Dynamic characteristics
GND = 0 V; test circuit see Figure 12.
Symbol Parameter Conditions
25 C
40 C to 40 C to Unit
+85 C +125 C
Min Typ Max Min Max Min Max
74HC423
tpd propagation nA or nB to nQ or nQ; REXT = 5 k;
delay
CEXT = 0 pF; see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
VCC = 6.0 V
nRD to nQ or nQ; see Figure 7
[1]
-
-
-
-
[1]
80 255 - 320 - 385 ns
29 51 - 64 - 77 ns
25 - - - - - ns
23 43 - 54 - 65 ns
VCC = 2.0 V
- 66 215 - 270 - 325 ns
VCC = 4.5 V
- 24 43 - 54 - 65 ns
VCC = 5.0 V; CL = 15 pF
- 20 - - - - - ns
VCC = 6.0 V
- 19 37 - 46 - 55 ns
tt transition time see Figure 7
[2]
VCC = 2.0 V
- 19 75 - 95 - 110 ns
VCC = 4.5 V
- 7 15 - 19 - 22 ns
VCC = 6.0 V
- 6 13 - 16 - 19 ns
tW pulse width nA input LOW; see Figure 7 and Figure 8
VCC = 2.0 V
100 11 - 125 - 150 - ns
VCC = 4.5 V
20 4 - 25 - 30 - ns
VCC = 6.0 V
17 3 - 21 - 26 - ns
nB input HIGH; see Figure 7 and Figure 8
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
nRD input LOW; see Figure 7 and Figure 8
100 17
20 6
17 5
- 125 - 150 - ns
- 25 - 30 - ns
- 21 - 26 - ns
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
nQ HIGH or nQ LOW; VCC = 5.0 V;
REXT = 10 k; CEXT = 100 nF;
see Figure 7 and Figure 8
100 14 - 125 - 150 - ns
20 5 - 25 - 30 - ns
17 4 - 21 - 26 - ns
- 450 - - - - - s
nQ HIGH or nQ LOW; VCC = 5.0 V;
REXT = 5 k; CEXT = 0 pF;
VI = GND to VCC;
see Figure 7 and Figure 8
[3] - 75 - - - - - ns
trtrig retrigger time nA or nB input; VCC = 5.0 V; REXT = 5 k; [4] - 110 - - - - - ns
CEXT = 0 pF; see Figure 10
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.
8 of 24







74HC423 equivalent, schematic
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
13. Package outline
DIP16: plastic dual in-line package; 16 leads (300 mil)
SOT38-4
D
L
Z
16
e
pin 1 index
b
A2 A
A1
wM
b1
b2
9
ME
c
(e 1)
MH
E
18
0 5 10 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
min.
A2
max.
b
b1 b2
c
D (1)
E (1)
e
e1
L
ME MH
w
Z (1)
max.
mm
4.2
0.51
3.2
1.73
1.30
0.53
0.38
1.25
0.85
0.36 19.50 6.48
0.23 18.55 6.20
2.54
7.62
3.60
3.05
8.25
7.80
10.0
8.3
0.254
0.76
inches 0.17
0.02
0.13
0.068 0.021 0.049 0.014
0.051 0.015 0.033 0.009
0.77
0.73
0.26
0.24
0.1
0.3
0.14
0.12
0.32
0.31
0.39
0.33
0.01
0.03
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
OUTLINE
VERSION
SOT38-4
IEC
REFERENCES
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
95-01-14
03-02-13
Fig 16. Package outline SOT38-4 (DIP16)
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.
16 of 24










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