74HC423D [NEXPERIA]
Dual retriggerable monostable multivibrator with resetProduction;
| 型号： | 74HC423D |
| 厂家： | 
Nexperia |
| 描述： | Dual retriggerable monostable multivibrator with resetProduction |
| 文件： | 总19页 (文件大小：759K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74HC423
Dual retriggerable monostable multivibrator with reset
Rev. 7 — 11 February 2016
Product data sheet
1. General description
The 74HC423 is a dual retriggerable monostable multivibrator with output pulse width
control by two methods. The basic pulse time is programmed by selection of an external
resistor (REXT) and capacitor (CEXT). Once triggered, the basic output pulse width may be
extended by retriggering (nA) or (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. 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. Inputs
include clamp diodes. This enables the use of current limiting resistors to interface inputs
to voltages in excess of VCC
.
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
Input levels:
For 74HC423: CMOS level
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
3. Ordering information
Table 1.
Type number Package
Temperature range Name
40 C to +125 C SO16
Ordering information
Description
Version
74HC423D
plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
74HC423BQ
40 C to +125 C
DHVQFN16 plastic dual in-line compatible thermal enhanced very thin SOT763-1
quad flat package; no leads; 16 terminals;
body 2.5 3.5 0.85 mm
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
4. Functional diagram
ꢀꢄ
ꢀ&(;7
ꢀꢃ
ꢀ5(;7ꢂ&(;7
6
ꢀꢁ
ꢀ4
ꢀ4
4
4
ꢀ
ꢀ$
7
ꢄ
ꢆ
ꢁ
ꢀ%
5'
6
ꢉ
ꢈ
ꢀ5'
ꢆ&(;7
ꢆ5(;7ꢂ&(;7
ꢃ
ꢆ4
ꢆ4
4
4
ꢅ
ꢆ$
7
ꢀꢆ
ꢀꢇ
ꢀꢀ
ꢆ%
5'
ꢆ5'
ꢀꢀꢁDDKꢂꢃꢄ
Fig 1. Functional Diagram
ꢀꢄ
ꢀꢃ
&;
ꢀꢁ
ꢄ
5&;
ꢀ
ꢆ
ꢊ
5
ꢀ&(;7 ꢀꢄ
ꢆ&(;7
ꢉ
ꢁ
ꢀ5(;7ꢂ&(;7 ꢀꢃ
ꢆ5(;7ꢂ&(;7
ꢈ
6
ꢀ4 ꢀꢁ
ꢉ
ꢈ
&;
4
4
ꢆ4
ꢃ
ꢀ
ꢅ
ꢀ$
ꢆ$
ꢃ
5&;
7
ꢅ
ꢀ4
ꢄ
ꢊ
ꢆ
ꢀ%
ꢀꢇ
ꢀꢆ
ꢆ4 ꢀꢆ
5'
ꢀꢇ ꢆ%
ꢀꢀ
5
ꢀ5'
ꢁ
ꢀꢀꢁDDKꢂꢃꢂ
ꢀꢀ ꢆ5'
ꢀꢀꢁDDKꢂꢃꢅ
Fig 2. Logic symbol
Fig 3. IEC Logic symbol
74HC423
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.
Product data sheet
Rev. 7 — 11 February 2016
2 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
5(;7ꢂ&(;7
9
&&
4
4
5'
5
&/
&/
9
&&
9
&&
5
&/
&/
&/
$
%
ꢀꢀꢁDDKꢂꢃꢃ
Fig 4. Logic diagram
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
3 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
5. Pinning information
5.1 Pinning
ꢀꢁ+&ꢁꢂꢃ
ꢀꢁ+&ꢁꢂꢃ
WHUPLQDOꢎꢀ
LQGH[ꢎDUHD
ꢀ
ꢆ
ꢁ
ꢄ
ꢃ
ꢉ
ꢈ
ꢋ
ꢀꢉ
ꢀꢃ
ꢀꢄ
ꢀꢁ
ꢀꢆ
ꢀꢀ
ꢀꢇ
ꢅ
ꢀ$
9
&&
ꢀ%
ꢀ5'
ꢀ5(;7ꢂ&(;7
ꢆ
ꢁ
ꢄ
ꢃ
ꢉ
ꢈ
ꢀꢃ
ꢀꢄ
ꢀꢁ
ꢀꢆ
ꢀꢀ
ꢀꢇ
ꢀ%
ꢀ5'
ꢀ5(;7ꢂ&(;7
ꢀ&(;7
ꢀ4
ꢀ&(;7
ꢀ4
ꢀ4
ꢀ4
ꢆ4
ꢆ4
ꢆ4
ꢆ4
ꢆ&(;7
ꢆ5(;7ꢂ&(;7
ꢌꢀꢍ
&&
ꢆ5'
ꢆ%
9
ꢆ&(;7
ꢆ5(;7ꢂ&(;7
*1'
ꢆ5'
ꢆ%
DDDꢆꢀꢁꢅꢅꢂꢁ
ꢆ$
7UDQVSDUHQWꢎWRSꢎYLHZ
DDDꢆꢀꢁꢅꢅꢂꢀ
(1) This is not a supply pin. The substrate is attached to this
pad using conductive die attach material. There is no
electrical or mechanical requirement to solder this pad.
However, if it is soldered, the solder land should remain
floating or be connected to VCC
.
Fig 5. Pin configuration SO16
Fig 6. Pin configuration DHVQFN16
5.2 Pin description
Table 2.
Pin description
Symbol
Pin
Description
trigger input (negative edge triggered)
1A, 2A
1, 9
2, 10
3, 11
4, 12
8
1B, 2B
trigger input (positive edge triggered)
direct reset (active LOW)
output (active LOW)
1RD, 2RD
1Q, 2Q
GND
ground (0 V)
1Q, 2Q
13, 5
14, 6
15, 7
16
output (active HIGH)
1CEXT, 2CEXT
1REXT/CEXT, 2REXT/CEXT
VCC
external capacitor connection
external resistor/capacitor connection
supply voltage
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
4 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
6. Functional description
Table 3.
Function table[1]
Input
nRD
L
Output
nA
X
nB
X
nQ
L
nQ
H
X
H
X
X
L[2]
L[2]
H[2]
H[2]
X
L
H
L
H
H
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
= LOW-to-HIGH transition;
= HIGH-to-LOW transition;
= one HIGH level output pulse;
= one LOW level output pulse.
[2] If the monostable multivibrator was triggered before this condition was established, the pulse will continue as programmed.
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
VCC
IIK
Parameter
Conditions
Min
Max Unit
supply voltage
0.5
+7
20
20
25
50
V
[1]
[1]
input clamping current
output clamping current
output current
VI < 0.5 V or VI > VCC + 0.5 V
VO < 0.5 V or VO > VCC + 0.5 V
0.5 V < VO < VCC + 0.5 V
-
mA
mA
mA
mA
mA
IOK
-
IO
-
-
ICC
supply current
IGND
Tstg
Ptot
ground current
50
65
-
-
storage temperature
total power dissipation
+150 C
500 mW
[2]
SO16 and DHVQFN16 packages
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO16 package: above 70 C the value of Ptot derates linearly at 8 mW/K;
For DHVQFN16 package: above 60 C the value of Ptot derates linearly at 4.5 mW/K.
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
5 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
8. Recommended operating conditions
Table 5.
Recommended operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol
VCC
Parameter
Conditions
Min
Typ
Max
6.0
Unit
V
supply voltage
input voltage
2.0
5.0
VI
0
-
VCC
VCC
+125
625
139
83
V
VO
output voltage
ambient temperature
0
-
V
Tamb
t/V
40
-
C
input transition rise and fall
rate
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
-
-
-
-
1.67
-
ns/V
ns/V
ns/V
9. Static characteristics
Table 6.
Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
25 C
40 C to
+85 C
40 C to Unit
+125 C
Min Typ Max Min Max Min Max
VIH
HIGH-level
input voltage
VCC = 2.0 V
1.5
1.2
-
-
1.5
-
-
1.5
-
-
V
V
V
V
V
V
VCC = 4.5 V
3.15 2.4
3.15
3.15
VCC = 6.0 V
4.2
3.2
0.8
-
4.2
-
4.2
-
VIL
LOW-level
input voltage
VCC = 2.0 V
-
-
-
0.5
-
-
-
0.5
1.35
1.8
-
-
-
0.5
1.35
1.8
VCC = 4.5 V
2.1 1.35
VCC = 6.0 V
2.8
1.8
VOH
HIGH-level
VI = VIH or VIL
output voltage
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
1.9
4.4
5.9
2.0
4.5
6.0
-
-
-
-
-
1.9
4.4
-
-
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
V
V
V
V
V
5.9
3.98 4.32
5.48 5.81
3.84
5.34
VOL
LOW-level
output voltage
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
-
-
-
-
-
-
0
0
0
0.1
0.1
0.1
-
-
-
-
-
-
0.1
0.1
-
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
V
V
V
V
V
0.1
0.15 0.26
0.16 0.26
0.33
0.33
1.0
II
input leakage
current
-
0.1
8.0
-
1.0 A
ICC
CI
supply current
VI = VCC or GND; IO = 0 A;
VCC = 6.0 V
-
-
-
-
-
80
-
-
-
160 A
input capacitance
3.5
-
pF
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
6 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
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
[1]
tpd
propagation
delay
nA or nB to nQ or nQ; REXT = 5 k;
CEXT = 0 pF; see Figure 7
VCC = 2.0 V
-
-
-
-
80
29
25
23
255
51
-
-
-
-
-
320
64
-
-
-
-
-
385 ns
77 ns
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
VCC = 6.0 V
-
ns
43
54
65 ns
[1]
nRD to nQ or nQ; see Figure 7
VCC = 2.0 V
-
-
-
-
66
24
20
19
215
43
-
-
-
-
-
270
54
-
-
-
-
-
325 ns
65 ns
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
VCC = 6.0 V
-
ns
37
46
55 ns
[2]
tt
transition time see Figure 7
VCC = 2.0 V
-
-
-
19
7
75
15
13
-
-
-
95
19
16
-
-
-
110 ns
22 ns
19 ns
VCC = 4.5 V
VCC = 6.0 V
6
tW
pulse width
nA input LOW; see Figure 7 and Figure 8
VCC = 2.0 V
100
20
11
4
-
-
-
125
25
-
-
-
150
30
-
-
-
ns
ns
ns
VCC = 4.5 V
VCC = 6.0 V
17
3
21
26
nB input HIGH; see Figure 7 and Figure 8
VCC = 2.0 V
100 17
-
-
-
125
25
-
-
-
150
30
-
-
-
ns
ns
ns
VCC = 4.5 V
20
17
6
5
VCC = 6.0 V
21
26
nRD input LOW; see Figure 7 and Figure 8
VCC = 2.0 V
100 14
-
-
-
-
125
25
21
-
-
-
-
-
150
30
26
-
-
-
-
-
ns
ns
ns
s
VCC = 4.5 V
20
17
-
5
4
VCC = 6.0 V
nQ HIGH or nQ LOW; VCC = 5.0 V;
450
REXT = 10 k; CEXT = 100 nF;
see Figure 7 and Figure 8
[3]
[4]
nQ HIGH or nQ LOW; VCC = 5.0 V;
REXT = 5 k; CEXT = 0 pF;
-
-
75
-
-
-
-
-
-
-
-
-
-
ns
ns
VI = GND to VCC
;
see Figure 7 and Figure 8
trtrig
retrigger time nA or nB input; VCC = 5.0 V; REXT = 5 k;
EXT = 0 pF; see Figure 10
110
C
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
7 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
Table 7.
Dynamic characteristics …continued
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
REXT
external timing VCC = 2.0 V; see Figure 8
10
2
-
-
1000
1000
-
-
-
-
-
-
-
-
k
k
pF
resistor
VCC = 5.0 V
[5]
[6]
CEXT
CPD
external timing VCC = 5.0 V; see Figure 8
capacitor
no limits
power
per package; VI = GND to VCC
-
54
-
-
-
-
-
pF
dissipation
capacitance
[1] tpd is the same as tPHL and tPLH
.
[2] tt is the same as tTHL and tTLH
.
[3] For other REXT and CEXT combinations see Figure 8. If CEXT > 10 pF, the next formula is valid:
tW = K REXT CEXT (typ.), where:
tW = output pulse width in ns;
REXT = external resistor in k;
CEXT = external capacitor in pF;
K = 0.55 for VCC = 2.0 V and 0.45 for VCC = 5.0 V; see Figure 9.
Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.
[4] The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT. The output pulse width will only be
extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time.
If CEXT > 10 pF, the next formula (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid:
trtrig = 30 + 0.19 REXT CEXT0.9 + 13 REXT1.05 (typ.); where:
trtrig = retrigger time in ns;
CEXT = external capacitor in pF;
REXT = external resistor in k.
Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.
[5] When the device is powered-up, initiate the device via a reset pulse, when CEXT < 50 pF.
[6] CPD is used to determine the dynamic power dissipation (PD in W):
PD = CPD VCC2 fi N + (CL VCC2 fo); where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
(CL VCC2 fo) = sum of outputs.
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
8 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
11. Waveforms
9
,
Q%ꢎLQSXW
*1'
9
0
W
:
9
,
9
Q$ꢎLQSXW
*1'
0
W
:
W
:
9
,
9
Q5'ꢎLQSXW
*1'
0
W
W
W
W
ꢌUHVHWꢍ
ꢌUHVHWꢍ
W
W
3/+
3/+
3+/ꢎ
3/+
3+/
9
2+
9
<
Q4ꢎRXWSXW
9
0
9
;
W
9
2/
W
W
W
:
7/+
7+/
W
W
3+/
3+/
3/+ꢎ
9
2+
9
<
Q4ꢎRXWSXW
9
0
9
;
9
2/
W
W
7/+
:
7+/
ꢀꢀꢁDDKꢃꢁꢁ
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7. Pulse widths, propagation delays from inputs (nA, nB, nRD) to outputs (nQ, nQ) and
output transition times
Table 8.
Input
VI
Measurement points
Output
VM
VM
VX
VY
VCC
0.5VCC
0.5VCC
0.1VCC
0.9VCC
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
9 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
ꢀꢀꢁDDDꢄꢁꢁ
ꢀꢀꢁDDDꢄꢁꢇ
ꢉ
ꢀꢇ
ꢇꢏꢋ
W
:ꢎ
ꢌQVꢍ
ꢐ.ꢐꢎIDFWRU
ꢇꢏꢉ
ꢌꢀꢍ
ꢌꢆꢍ
ꢃ
ꢄ
ꢁ
ꢆ
ꢀꢇ
ꢌꢁꢍ
ꢌꢄꢍ
ꢀꢇ
ꢀꢇ
ꢀꢇ
ꢇꢏꢄ
ꢇꢏꢆ
ꢇ
ꢀꢇ
ꢆ
ꢁ
ꢄ
ꢀ
ꢀꢇ
ꢀꢇ
ꢀꢇ
ꢀꢇ
ꢎꢌS)ꢍ
ꢇ
ꢆ
ꢄ
ꢉ
ꢋ
&
(;7
9
ꢎꢌ9ꢍ
&&
VCC = 5.0 V and Tamb = 25 C.
External capacitance = 10 nF,
external resistance = 10 k to 100 k and Tamb = 25 C.
(1) REXT = 100 k.
(2) REXT = 50 k.
(3)
REXT = 10 k.
(4) REXT = 2 k.
Fig 8. Typical output pulse width as a function of the
external capacitor values
Fig 9. Typical ‘K’ factor
Q%ꢎLQSXW
W
:
Q$ꢎLQSXW
W
W
:
UWULJꢎ
Q4ꢎRXWSXW
W
W
:
:
W
PQDꢈꢇꢁ
:
nRD = HIGH.
Fig 10. Output pulse control using retrigger pulse (trtrig
)
74HC423
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.
10 of 19
Product data sheet
Rev. 7 — 11 February 2016
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
Q%ꢎLQSXW
Q5'ꢎLQSXW
W
:
Q4ꢎRXWSXW
W
W
:
:
PQDꢈꢇꢇ
nA = LOW.
Fig 11. Output pulse control using reset input nRD
W
:
9
,
ꢅꢇꢎꢑ
QHJDWLYHꢎ
SXOVH
9
9
9
9
0
0
0
ꢀꢇꢎꢑ
ꢅꢇꢎꢑ
*1'
W
W
U
I
W
W
I
U
9
,
SRVLWLYHꢎ
SXOVH
0
ꢀꢇꢎꢑ
*
*1'
W
:
9
&&
9
,
9
2
'87
5
7
&
/
ꢀꢀꢁDDKꢂꢄꢅꢉ
ꢉ
Test data is given in Table 9.
Definitions for test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
Fig 12. Test circuit for measuring switching times
Table 9.
Supply
VCC
Test data
Input
VI
Load
tr, tf
CL
2.0 V to 6.0 V
VCC
6 ns
15 pF, 50 pF
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
11 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
12. Application information
12.1 Timing component connections
The basic output pulse width is essentially determined by the values of the external timing
components REXT and CEXT
.
&
(;7
5
(;7
ꢌꢀꢍ
9
&&
*1'
ꢋ
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ꢀꢄꢎꢌꢉꢍ
Q5(;7ꢂ&(;7
ꢀꢃꢎꢌꢈꢍ
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ꢁꢂꢃ
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ꢀꢎꢌꢅꢍ
Q$
Q%
ꢆꢎꢌꢀꢇꢍ
ꢄꢎꢌꢀꢆꢍ
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ꢀꢀꢁDDKꢃꢁꢂ
(1) For minimum noise generation it is recommended that the nCEXT pins (6, 14) are connected to ground externally to
the GND pin (8).
Fig 13. Timing component connections
12.1.1 Minimum monostable pulse width
To set the minimum pulse width, when CEXT < 10 nF, see Figure 8 and
when CEXT > 10 nF, the output pulse width is defined as:
tW = 0.45 REXT CEXT (typ.), where:
tW = pulse width in s;
REXT = external resistor in k;
CEXT = external capacitor in nF.
12.2 Power-up considerations
When the monostable is powered-up it may produce an output pulse, with a pulse width
defined by the values of REXT and CEXT, this output pulse can be eliminated using the
circuit shown in Figure 14.
74HC423
All information provided in this document is subject to legal disclaimers.
.
12 of 19
Product data sheet
Rev. 7 — 11 February 2016
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
&
(;7
5
(;7
9
&&
*1'
ꢋ
Q&(;7
ꢀꢄꢎꢌꢉꢍ
Q5(;7ꢂ&(;7
ꢀꢃꢎꢌꢈꢍ
ꢀꢁꢎꢌꢃꢍ
ꢁꢂꢃ
Q4
ꢀꢎꢌꢅꢍ
Q$
Q%
ꢆꢎꢌꢀꢇꢍ
ꢄꢎꢌꢀꢆꢍ
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ꢁꢎꢌꢀꢀꢍ
Q5'
9
5(6(7
&&
ꢀꢀꢁDDKꢃꢁꢅ
Fig 14. Power-up output pulse elimination circuit
12.3 Power-down considerations
A large capacitor CEXT may cause problems when powering-down the monostable due to
the capacitor’s stored energy. When a system containing this device is powered-down or a
rapid decrease of VCC 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 DEXT preferably a germanium or Schottky type diode able to withstand
large current surges and connect as shown in Figure 15.
'
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(;7
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(;7
5
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Q4
ꢁꢎꢌꢀꢀꢍ
ꢀꢀꢁDDKꢃꢁꢃ
Q5'
Fig 15. Power-down protection circuit
74HC423
All information provided in this document is subject to legal disclaimers.
.
13 of 19
Product data sheet
Rev. 7 — 11 February 2016
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
13. Package outline
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Fig 16. Package outline SOT109-1 (SO16)
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
14 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
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Fig 17. Package outline SOT763-1 (DHVQFN16)
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
15 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
14. Abbreviations
Table 10. Abbreviations
Acronym
CMOS
DUT
Description
Complementary Metal Oxide Semiconductor
Device Under Test
ESD
ElectroStatic Discharge
Human Body Model
Machine Model
HBM
MM
TTL
Transistor-Transistor Logic
15. Revision history
Table 11. Revision history
Document ID
74HC423 v.7
Modifications:
Release date
20160211
Data sheet status
Change notice
Supersedes
Product data sheet
-
74HC_HCT423 v.6
• Type numbers 74HC423N, 74HCT423N, 74HCT423D, 74HCT423DB, 74HCT423PW and
74HCT423BQ removed.
74HC_HCT423 v.6
Modifications:
20111219
Product data sheet
-
74HC_HCT423 v.5
• Legal pages updated.
74HC_HCT423 v.5
74HC_HCT423 v.4
74HC_HCT423 v.3
20110825
20110318
20080724
Product data sheet
-
-
-
-
74HC_HCT423 v.4
74HC_HCT423 v.3
74HC_HCT423_CNV v.2
-
Product data sheet
Product data sheet
Product specification
74HC_HCT423_CNV v.2 19980708
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
16 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
16. Legal information
16.1 Data sheet status
Document status[1][2]
Product status[3]
Development
Definition
Objective [short] data sheet
This document contains data from the objective specification for product development.
This document contains data from the preliminary specification.
This document contains the product specification.
Preliminary [short] data sheet Qualification
Product [short] data sheet Production
[1]
[2]
[3]
Please consult the most recently issued document before initiating or completing a design.
The term ‘short data sheet’ is explained in section “Definitions”.
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nexperia.com.
Suitability for use — Nexperia products are not designed,
16.2 Definitions
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of a Nexperia product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. Nexperia and its suppliers accept no liability for
inclusion and/or use of Nexperia products in such equipment or
applications and therefore such inclusion and/or use is at the customer’s own
risk.
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local Nexperia sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. Nexperia makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using Nexperia products, and Nexperia
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the Nexperia
product is suitable and fit for the customer’s applications and
products planned, as well as for the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
Product specification — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
Nexperia and its customer, unless Nexperia and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the Nexperia product is
deemed to offer functions and qualities beyond those described in the
Product data sheet.
Nexperia does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and products using Nexperia
products in order to avoid a default of the applications and
16.3 Disclaimers
Limited warranty and liability — Information in this document is believed to
be accurate and reliable. However, Nexperia does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. Nexperia takes no
responsibility for the content in this document if provided by an information
source outside of Nexperia.
the products or of the application or use by customer’s third party
customer(s). Nexperia does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
In no event shall Nexperia be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Terms and conditions of commercial sale — Nexperia
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nexperia.com/profile/terms, unless otherwise
agreed in a valid written individual agreement. In case an individual
agreement is concluded only the terms and conditions of the respective
agreement shall apply. Nexperia hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of Nexperia products by customer.
Notwithstanding any damages that customer might incur for any reason
whatsoever, Nexperia's aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of Nexperia.
Right to make changes — Nexperia reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
No offer to sell or license — Nothing in this document may be interpreted or
construed as an offer to sell products that is open for acceptance or the grant,
conveyance or implication of any license under any copyrights, patents or
other industrial or intellectual property rights.
74HC423
All information provided in this document is subject to legal disclaimers.
.
Product data sheet
Rev. 7 — 11 February 2016
17 of 19
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Nexperia's specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies Nexperia for any
liability, damages or failed product claims resulting from customer design and
use of the product for automotive applications beyond Nexperia's
standard warranty and Nexperia's product specifications.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific Nexperia product is automotive qualified,
the product is not suitable for automotive use. It is neither qualified nor tested
in accordance with automotive testing or application requirements. Nexperia
accepts no liability for inclusion and/or use of
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automotive specifications and standards, customer
(a) shall use the product without Nexperia's warranty of the
product for such automotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
16.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
17. Contact information
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
74HC423
All information provided in this document is subject to legal disclaimers.
.
18 of 19
Product data sheet
Rev. 7 — 11 February 2016
©
Nexperia B.V. 2017. All rights reserved
74HC423
Nexperia
Dual retriggerable monostable multivibrator with reset
18. Contents
1
2
3
4
General description. . . . . . . . . . . . . . . . . . . . . . 1
Features and benefits . . . . . . . . . . . . . . . . . . . . 1
Ordering information. . . . . . . . . . . . . . . . . . . . . 1
Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5
5.1
5.2
Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
6
Functional description . . . . . . . . . . . . . . . . . . . 5
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recommended operating conditions. . . . . . . . 6
Static characteristics. . . . . . . . . . . . . . . . . . . . . 6
Dynamic characteristics . . . . . . . . . . . . . . . . . . 7
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7
8
9
10
11
12
Application information. . . . . . . . . . . . . . . . . . 12
Timing component connections . . . . . . . . . . . 12
Minimum monostable pulse width. . . . . . . . . . 12
Power-up considerations . . . . . . . . . . . . . . . . 12
Power-down considerations . . . . . . . . . . . . . . 13
12.1
12.1.1
12.2
12.3
13
14
15
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 14
Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 16
Revision history. . . . . . . . . . . . . . . . . . . . . . . . 16
16
Legal information. . . . . . . . . . . . . . . . . . . . . . . 17
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 17
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
16.1
16.2
16.3
16.4
17
18
Contact information. . . . . . . . . . . . . . . . . . . . . 18
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
© Nexperia B.V. 2017. All rights reserved
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release:11 February 2016
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