74HC4538
Dual retriggerable precision monostable multivibrator
Rev. 5 — 17 March 2017
1
Product data sheet
General description
The 74HC4538 is a dual retriggerable-resettable monostable multivibrator. Each
multivibrator has two trigger/retrigger inputs (nA and nB), a direct reset input (nCD),
two complementary outputs (nQ and nQ), and two pins (nREXT/CEXT and nCEXT)
for connecting the external timing components CEXT and REXT. Typical pulse width
variation over temperature range is ± 0.2 %. The device may be triggered by either the
positive or the negative edges of the input pulse. The duration and accuracy of the output
pulse are determined by the external timing components CEXT and REXT. The output
pulse width (TW) is equal to 0.7 × REXT × CEXT. The linear design techniques guarantee
precise control of the output pulse width. A LOW level at nCD terminates the output pulse
immediately. Schmitt-trigger action in the trigger inputs makes the circuit highly tolerant
to slower rise and fall times. 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
•
•
•
•
•
•
Tolerant of slow trigger rise and fall times
Separate reset inputs
Triggering from falling or rising edge
Complies with JEDEC standard no. 7A
CMOS input levels:
ESD protection:
– HBM JESD22-A114F exceeds 2000 V
– MM JESD22-A115-A exceeds 200 V
• Multiple package options
• Specified from -40 °C to +85 °C and from -40 °C to +125 °C
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
3
Ordering information
Table 1. Ordering information
Type number Package
Temperature
range
Name
Description
Version
74HC4538D
-40 °C to +125 °C
SO16
plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
74HC4538DB
-40 °C to +125 °C
SSOP16
plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
74HC4538PW
-40 °C to +125 °C
TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
4
SOT403-1
Functional diagram
2
1REXT/CEXT
1
1CEXT
5
1A
4
1B
3
1CD
14
2REXT/CEXT
15
2CEXT
11
2A
12
2B
13
2CD
1Q
6
1Q
7
2Q
10
2Q
9
001aae727
Figure 1. Functional diagram
74HC4538
Product data sheet
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
nB
nA
VCC
nREXT/CEXT
Vref1
enable
nCEXT
GND
nCD
power-on reset
VCC
Vref2
enable
nQ
nQ
mba338
GND
Figure 2. Logic diagram (one multivibrator)
74HC4538
Product data sheet
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
5
Pinning information
5.1 Pinning
74HC4538
1CEXT
1
16 VCC
1REXT/CEXT
2
15 2CEXT
1CD
3
14 2REXT/CEXT
1B
4
13 2CD
1A
5
12 2B
1Q
6
11 2A
1Q
7
10 2Q
GND
8
9
74HC4538
1CEXT
1
16 VCC
1REXT/CEXT
2
15 2CEXT
1CD
3
14 2REXT/CEXT
1B
4
13 2CD
1A
5
12 2B
1Q
6
11 2A
1Q
7
10 2Q
GND
8
2Q
aaa-026540
9
2Q
aaa-026542
Figure 3. Pin configuration for SO16
Figure 4. Pin configuration for SSOP16 and TSSOP16
5.2 Pin description
Table 2. Pin description
Symbol
Pin
Description
1CEXT, 2CEXT
1, 15
external capacitor connection (always connected to ground)
1REXT/CEXT, 2REXT/CEXT
2, 14
external capacitor/resistor connection
1CD, 2CD
3, 13
direct reset input (active LOW)
1B, 2B
4, 12
input (LOW to HIGH triggered)
1A, 2A
5, 11
input (HIGH to LOW triggered)
1Q, 2Q
6, 10
output
1Q, 2Q
7, 9
complementary output (active LOW)
GND
8
ground (0 V)
VCC
16
supply voltage
74HC4538
Product data sheet
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
6
Functional description
Table 3. Function table
[1]
Inputs
Outputs
nA
nB
nCD
↓
L
H
H
↑
H
X
X
L
[1]
nQ
nQ
L
H
H = HIGH voltage level; L = LOW voltage level; X = don’t care;
↑ = positive-going transition; ↓ = negative-going transition;
= one HIGH level output pulse, with the pule width determined by CEXT and REXT;
= one LOW level output pulse, with the pulse width determined by CEXT and REXT.
(1)
(1)
(2)
(1)
nB input
(3)
nA input
(4)
nCD input
nREXT/CEXT input
Vref2
Vref1
Vref1
Vref2
nQ output
T
T
(5)
T
001aae737
(1) Positive edge triggering.
(2) Positive edge re-triggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) TW = 0.7 x REXT x CEXT (see also Figure 6.
Figure 5. Timing diagram
CEXT
GND
nCEXT
REXT
VCC
nREXT/CEXT
nA
nB
nQ
T
nQ
T = 0.7 × REXT × CEXT
nCD
001aak192
Figure 6. Connection of the external timing components REXT and CEXT
74HC4538
Product data sheet
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5 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
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 Parameter
VCC
Conditions
supply voltage
IIK
input clamping current
Min
Max
Unit
-0.5
+7.0
V
VI < -0.5 V or VI > VCC + 0.5 V
[1]
-
±20
mA
[1]
-
±20
mA
-
±25
mA
IOK
output clamping current
VO < -0.5 V or VO > VCC + 0.5 V
IO
output current
VO = -0.5 V to VCC + 0.5 V
ICC
supply current
-
+50
mA
IGND
ground current
-50
-
mA
Tstg
storage temperature
-65
+150
°C
Ptot
total power dissipation
[1]
[2]
[3]
Tamb = -40 °C to +125 °C
SO16 package
[2]
-
500
mW
(T)SSOP16 package
[3]
-
500
mW
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
Ptot derates linearly with 8 mW/K above 70 °C.
Ptot derates linearly with 5.5 mW/K above 60 °C.
8
Recommended operating conditions
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter
Conditions
Min
Typ
Max
Unit
2.0
5.0
6.0
V
VCC
supply voltage
VI
input voltage
0
-
VCC
V
VO
output voltage
0
-
VCC
V
Tamb
ambient temperature
-40
-
+125
°C
Δt/ΔV
input transition rise and fall rate
VCC = 2.0 V
-
-
625
ns/V
VCC = 4.5 V
-
1.67
139
ns/V
VCC = 6.0 V
-
-
83
ns/V
74HC4538
Product data sheet
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
9
Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
VIH
VOL
II
-40 °C to +85 °C -40 °C to +125 °C Unit
Min
Max
Min
Max
VCC = 2.0 V
1.5
1.2
-
1.5
-
1.5
-
V
VCC = 4.5 V
3.15
2.4
-
3.15
-
3.15
-
V
VCC = 6.0 V
4.2
3.2
-
4.2
-
4.2
-
V
VCC = 2.0 V
-
0.8
0.5
-
0.5
-
0.5
V
VCC = 4.5 V
-
2.1
1.35
-
1.35
-
1.35
V
VCC = 6.0 V
-
2.8
1.8
-
1.8
-
1.8
V
VI = VIH or VIL
HIGH-level
output voltage
IO = -20 μA; VCC = 2.0 V
1.9
2.0
-
1.9
-
1.9
-
V
IO = -20 μA; VCC = 4.5 V
4.4
4.5
-
4.4
-
4.4
-
V
IO = -20 μA; VCC = 6.0 V
5.9
6.0
-
5.9
-
5.9
-
V
IO = -4.0 mA; VCC = 4.5 V 3.98 4.32
-
3.84
-
3.7
-
V
IO = -5.2 mA; VCC = 6.0 V 5.48 5.81
-
5.34
-
5.2
-
V
LOW-level
input voltage
VOH
25 °C
Min Typ Max
HIGH-level
input voltage
VIL
Conditions
VI = VIH or VIL
LOW-level
output voltage
IO = 20 μA; VCC = 2.0 V
-
0
0.1
-
0.1
-
0.1
V
IO = 20 μA; VCC = 4.5 V
-
0
0.1
-
0.1
-
0.1
V
IO = 20 μA; VCC = 6.0 V
-
0
0.1
-
0.1
-
0.1
V
IO = 4.0 mA; VCC = 4.5 V
-
0.15 0.26
-
0.33
-
0.4
V
IO = 5.2 mA; VCC = 6.0 V
-
0.16 0.26
-
0.33
-
0.4
V
input leakage
current
VI = VCC or GND;
VCC = 6.0 V
-
-
±0.1
-
±1
-
±1
μA
pin nREXT/CEXT;
VI = 2.0 V or GND;
other inputs at VCC or GND;
[1]
VCC = 6.0 V
-
-
±50
-
±500
-
±500
nA
ICC
supply current VI = VCC or GND; IO = 0 A;
VCC = 6.0 V
-
-
8.0
-
80
-
160
μA
CI
input
capacitance
-
3.5
-
-
-
-
-
pF
[1]
This measurement can only be carried out after a trigger pulse is applied.
74HC4538
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
10 Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter
Conditions
25 °C
Min Typ
tPLH
LOW to HIGH nA, nB to nQ; see Figure 7
propagation
VCC = 2.0 V
delay
VCC = 4.5 V
[1]
-40 °C to
+85 °C
-40 °C to
+125 °C
Max
Min
Max
Min
Max
Unit
-
85
265
-
330
-
400
ns
-
31
53
-
66
-
80
ns
VCC = 5.0 V; CL = 15 pF
-
27
-
-
-
-
-
ns
VCC = 6.0 V
-
25
45
-
56
-
68
ns
VCC = 2.0 V
-
83
265
-
340
-
400
ns
VCC = 4.5 V
-
30
53
-
68
-
80
ns
VCC = 6.0 V
-
24
45
-
58
-
68
ns
-
83
265
-
330
-
400
ns
-
30
53
-
66
-
80
ns
VCC = 5.0 V; CL = 15 pF
-
27
-
-
-
-
-
ns
VCC = 6.0 V
-
24
45
-
56
-
68
ns
VCC = 2.0 V
-
80
265
-
330
-
400
ns
VCC = 4.5 V
-
29
53
-
66
-
80
ns
-
23
45
-
56
-
68
ns
VCC = 2.0 V
-
19
75
-
95
-
119
ns
VCC = 4.5 V
-
7
15
-
19
-
22
ns
VCC = 6.0 V
-
6
13
-
16
-
19
ns
VCC = 2.0 V
80
17
-
100
-
120
-
ns
VCC = 4.5 V
16
6
-
20
-
24
-
ns
VCC = 6.0 V
14
5
-
17
-
20
-
ns
VCC = 2.0 V
80
17
-
100
-
120
-
ns
VCC = 4.5 V
16
6
-
20
-
24
-
ns
VCC = 6.0 V
14
5
-
17
-
20
-
ns
80
19
-
100
-
120
-
ns
nCD to nQ; see Figure 7
tPHL
HIGH to LOW nA, nB to nQ; see Figure 7
propagation
VCC = 2.0 V
delay
VCC = 4.5 V
nCD to nQ; see Figure 7
VCC = 6.0 V
tt
tW
transition time nQ and nQ; see Figure 7
pulse width
[2]
nA LOW; see Figure 8
nB HIGH; see Figure 8
nCD LOW; see Figure 8
VCC = 2.0 V
74HC4538
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
Symbol Parameter
Conditions
25 °C
Min Typ
[1]
-40 °C to
+85 °C
-40 °C to
+125 °C
Max
Min
Max
Min
Max
Unit
VCC = 4.5 V
16
7
-
20
-
24
-
ns
VCC = 6.0 V
14
6
-
17
-
20
-
ns
630
700
770
602
798
595
805
μs
VCC = 2.0 V
35
6
-
45
-
55
-
ns
VCC = 4.5 V
7
2
-
9
-
11
-
ns
VCC = 6.0 V
6
2
-
8
-
9
-
ns
VCC = 2.0 V
-
455+X
-
-
-
-
-
ns
VCC = 4.5 V
-
80+X
-
-
-
-
-
ns
VCC = 6.0 V
-
55+X
-
-
-
-
-
ns
VCC = 2.0 V
10
-
1000
-
-
-
-
kΩ
VCC = 5.0 V
2
-
1000
-
-
-
-
kΩ
-
-
-
pF
nQ and nQ HIGH or LOW;
see Figure 8
VCC = 5.0 V;
CEXT = 0.1 μF;
REXT = 10 kΩ
recovery time nCD to nA, nB;
see Figure 8
trec
trtrig
retrigger time
REXT
external
timing
resistor
CEXT
external
timing
capacitor
CPD
power
dissipation
capacitance
[1]
[2]
[3]
nA, nB; see Figure 8;
X = CEXT / (4.5 × VCC)
no limits
per multivibrator;
VI = GND to VCC
[3]
-
136
-
-
Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
tt is the same as tTHL and tTLH.
CPD is used to determine the dynamic power dissipation (PD in μW).
2
2
2
PD = CPD × VCC × fi + Σ(CL × VCC × fo) + 0.48 × CEXT × VCC × fo + D × 0.8 × VCC where:
fi = input frequency in MHz;
fo = output frequency in MHz;
2
Σ(CL × VCC × fo) = sum of the outputs;
CL = output load capacitance in pF;
VCC = supply voltage in V;
D = duty cycle factor in %;
CEXT = external timing capacitance in pF.
74HC4538
Product data sheet
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
10.1 Waveforms and test circuit
VI
nB input
VM
GND
tW
VI
nA input
VM
GND
tW
VI
nCD input
VM
GND
tPLH
VOH
nQ output
tPLH
VY
VM
VX
VOL
tPHL
tTHL
tPHL
VM
tPHL
tTLH
VOH
nQ output
tPLH
VY
VM
VX
VOL
001aak194
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Figure 7. Waveforms showing propagation delays and transition times
VI
nCD input
VM
GND
tW
trec
tW
VI
nA input
VM
GND
tW
VI
nB input
VM
GND
trtrig
VOH
nQ, nQ output
VM
VOL
tW
001aak195
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Figure 8. Waveforms showing nA, nB, nQ, nQ pulse widths, recovery and retrigger times
74HC4538
Product data sheet
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
Table 8. Measurement points
Input
Output
VM
VM
VX
VY
0.5VCC
0.5VCC
0.1VCC
0.9VCC
VI
negative
pulse
tW
90 %
VM
0V
VI
positive
pulse
0V
VM
10 %
tf
tr
tr
tf
90 %
VM
VM
10 %
tW
VCC
G
VI
DUT
VCC
VO
RT
RL
S1
open
CL
001aad983
Test data is given in Table 9 .
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
RL = Load resistance.
S1 = Test selection switch
Figure 9. Test circuit for measuring switching times
Table 9. Test data
Input
S1 position
Load
VI
tr, tf
CL
RL
tPHL, tPLH
VCC
6 ns
15 pF, 50 pF
1 kΩ
open
74HC4538
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
11 Application information
11.1 Power-down considerations
A large capacitor (CEXT) may cause problems when powering-down the monostable due
to energy stored in this capacitor. When a system containing this device is powereddown or 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 10
DEXT
CEXT
REXT
GND
nCEXT
VCC
nREXT/CEXT
001aak193
Figure 10. Power-down protection circuit
11.2 Graphs
001aak196
1.6
1 kΩ
2 kΩ
5.6 kΩ
51 kΩ
1 MΩ
normalized
K factor
(K)
1.2
1.12
REXT ×
CEXT
(tW)
0.84
1.0
0.70
0.8
0.56
0.6
10- 10
10- 9
10- 8
10- 7
10- 6
10- 5
CEXT (F)
0.42
10- 4
VCC = 4.5 V; Tamb = 25 °C.
Figure 11. Typical pulse width accuracy versus external capacitance
74HC4538
Product data sheet
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
001aak197
1.6
normalized
K factor
(K)
1.12
REXT ×
CEXT
(tW)
1.2
0.84
1 nF
1.0
0.70
> 100 nF
0.8
0.56
0.6
103
104
105
REXT (Ω)
0.42
106
VCC = 4.5 V; Tamb = 25 °C.
Figure 12. Typical pulse width accuracy versus external resistance
001aak198
1.6
normalized
K factor
(K)
1.12
REXT ×
CEXT
(tW)
1.2
0.84
+10 %
REXT
1.0
0.70
- 10 %
0.8
0.56
0.6
10- 10
10- 9
10- 8
10- 7
10- 6
10- 5
CEXT (F)
0.42
10- 4
VCC = 4.5 V; REXT = 10 kΩ; Tamb = 25 °C.
Figure 13. Typical pulse width accuracy versus external capacitance
001aak199
1.7
normalized
K factor
(K)
2 kΩ
1 kΩ
REXT ×
CEXT
(tW)
5.6 kΩ
1.3
0.91
10 kΩ
1.1
0.77
1 MΩ
0.9
0.7
1.19
1
2
0.63
3
4
5
VCC (V)
6
0.49
CEXT = 1 nF; Tamb = 25 °C.
Figure 14. Typical pulse width accuracy versus power supply
74HC4538
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
001aak200
1.7
normalized
K factor
(K)
1.3
0.9
0.7
REXT ×
CEXT
(tW)
1 kΩ
0.91
2 kΩ
5.6 kΩ
1 MΩ
1.1
1
1.19
0.77
0.63
2
3
4
5
6
VCC (V)
0.49
CEXT = 100 nF; Tamb = 25 °C.
Figure 15. Typical pulse width accuracy versus power supply
001aak201
1.7
1 kΩ
normalized
K factor
(K)
REXT ×
CEXT
(tW)
2 kΩ
1.3
1.19
0.91
5.6 kΩ
1.1
1 MΩ
0.77
0.9
0.7
- 50
0.63
0
50
100
Tamb (°C)
0.49
150
VCC = 4.5 V; CEXT = 1 nF; Tamb = 25 °C.
Figure 16. Typical pulse width accuracy versus temperature
001aak202
1.7
normalized
K factor
(K)
1.19
REXT ×
CEXT
(tW)
1.3
0.91
1.1
0.77
1 kΩ
2 kΩ
5.6 kΩ
1 MΩ
0.9
0.7
- 50
0
50
100
Tamb (°C)
0.63
0.49
150
VCC = 4.5 V; CEXT = 1 μF; Tamb = 25 °C.
Figure 17. Typical pulse width accuracy versus temperature
74HC4538
Product data sheet
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Rev. 5 — 17 March 2017
© Nexperia B.V. 2017. All rights reserved.
14 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
12 Package outline
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
D
E
A
X
c
y
HE
v M A
Z
16
9
Q
A2
A
(A 3)
A1
pin 1 index
θ
Lp
1
L
8
e
w M
bp
0
2.5
detail X
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (1)
e
HE
L
Lp
Q
v
w
y
Z (1)
mm
1.75
0.25
0.10
1.45
1.25
0.25
0.49
0.36
0.25
0.19
10.0
9.8
4.0
3.8
1.27
6.2
5.8
1.05
1.0
0.4
0.7
0.6
0.25
0.25
0.1
0.7
0.3
inches
0.069
0.010 0.057
0.004 0.049
0.01
0.019 0.0100 0.39
0.014 0.0075 0.38
0.16
0.15
0.05
0.039
0.016
0.028
0.020
0.01
0.01
0.004
0.028
0.012
0.244
0.041
0.228
θ
o
8
o
0
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT109-1
076E07
MS-012
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-19
Figure 18. Package outline SOT109-1 (SO16)
74HC4538
Product data sheet
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Rev. 5 — 17 March 2017
© Nexperia B.V. 2017. All rights reserved.
15 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm
D
SOT338-1
E
A
X
c
y
HE
v M A
Z
9
16
Q
A2
A
(A 3)
A1
pin 1 index
θ
Lp
L
8
1
detail X
w M
bp
e
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (1)
e
HE
L
Lp
Q
v
w
y
Z (1)
θ
mm
2
0.21
0.05
1.80
1.65
0.25
0.38
0.25
0.20
0.09
6.4
6.0
5.4
5.2
0.65
7.9
7.6
1.25
1.03
0.63
0.9
0.7
0.2
0.13
0.1
1.00
0.55
8o
0o
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
OUTLINE
VERSION
SOT338-1
REFERENCES
IEC
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-19
MO-150
Figure 19. Package outline SOT338-1 (SSOP16)
74HC4538
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 17 March 2017
© Nexperia B.V. 2017. All rights reserved.
16 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
D
SOT403-1
E
A
X
c
y
HE
v M A
Z
9
16
Q
A2
pin 1 index
(A 3 )
A1
A
θ
Lp
1
L
8
detail X
w M
bp
e
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (2)
e
HE
L
Lp
Q
v
w
y
Z (1)
θ
mm
1.1
0.15
0.05
0.95
0.80
0.25
0.30
0.19
0.2
0.1
5.1
4.9
4.5
4.3
0.65
6.6
6.2
1
0.75
0.50
0.4
0.3
0.2
0.13
0.1
0.40
0.06
8o
0o
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
OUTLINE
VERSION
SOT403-1
REFERENCES
IEC
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-18
MO-153
Figure 20. Package outline SOT403-1 (TSSOP16)
74HC4538
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 17 March 2017
© Nexperia B.V. 2017. All rights reserved.
17 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
13 Abbreviations
Table 10. Abbreviations
Acronym
Description
CMOS
Complementary Metal-Oxide Semiconductor
DUT
Device Under Test
ESD
ElectroStatic Discharge
HBM
Human Body Model
MM
Machine Model
14 Revision history
Table 11. Revision history
Document ID
Release date
Data sheet status
Change
notice
Supersedes
74HC4538 v.5
20170317
Product data sheet
-
74HC_HCT4538 v.4
Modifications:
• Type numbers 74HCT4538D, 74HCT4538DB, 74HCT4538PW removed.
• Table 6: Maximum input leakage current for pins 1REXT/CEXT and 2REXT/CEXT
changed.
74HC_HCT4538 v.4
20160224
Modifications:
• Type numbers 74HC4538N and 74HCT4538N (SOT38-4) removed.
74HC_HCT4538 v.3
20090608
Modifications:
• The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
• Legal texts have been adapted to the new company name where appropriate.
• Pin names changed throughout.
• Section Section 7, Section 8 and Section 9 added, taken from the 74HC/T HCMOS Family
characteristics/specification (March 1988).
• Test circuit added: Figure 9.
• Quick reference data incorporated in to Section 9 and Section 10.
• Package information added for DIP16, SO16, SSOP16 and TSSOP16 packages.
74HC_HCT4538_CNV v.2
19970902
74HC4538
Product data sheet
Product data sheet
Product data sheet
Product specification
-
-
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 17 March 2017
74HC_HCT4538 v.3
74HC_HCT4538_CNV v.2
-
© Nexperia B.V. 2017. All rights reserved.
18 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
15 Legal information
15.1 Data sheet status
Document status
[1][2]
Product status
[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product
development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[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.
15.2 Definitions
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.
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.
15.3 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. 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. 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.
Suitability for use — Nexperia products are not designed, authorized or
warranted to be suitable for use in life support, life-critical or safety-critical
74HC4538
Product data sheet
systems or equipment, nor in applications where failure or malfunction
of an 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.
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. 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 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.
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.
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.
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.
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 17 March 2017
© Nexperia B.V. 2017. All rights reserved.
19 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
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 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 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
74HC4538
Product data sheet
design and use of the product for automotive applications beyond Nexperia's
standard warranty and Nexperia's product specifications.
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.
15.4 Trademarks
Notice: All referenced brands, product names, service names and
trademarks are the property of their respective owners.
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 17 March 2017
© Nexperia B.V. 2017. All rights reserved.
20 / 21
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
Contents
1
2
3
4
5
5.1
5.2
6
7
8
9
10
10.1
11
11.1
11.2
12
13
14
15
General description ............................................ 1
Features and benefits .........................................1
Ordering information .......................................... 2
Functional diagram ............................................. 2
Pinning information ............................................ 4
Pinning ............................................................... 4
Pin description ................................................... 4
Functional description ........................................5
Limiting values .................................................... 6
Recommended operating conditions ................ 6
Static characteristics .......................................... 7
Dynamic characteristics .....................................8
Waveforms and test circuit .............................. 10
Application information .................................... 12
Power-down considerations .............................12
Graphs ............................................................. 12
Package outline .................................................15
Abbreviations .................................................... 18
Revision history ................................................ 18
Legal information .............................................. 19
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section 'Legal information'.
© 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: 17 March 2017
Document identifier: 74HC4538
Mouser Electronics
Authorized Distributor
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