74HC4538
Dual retriggerable precision monostable multivibrator
Rev. 6 — 16 July 2021
Product data sheet
1. 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
•
•
•
•
•
•
•
•
•
•
•
Wide supply voltage range from 2.0 to 6.0 V
CMOS low power dissipation
CMOS input levels
High noise immunity
Tolerant of slow trigger rise and fall times
Separate reset inputs
Triggering from falling or rising edge
Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
Complies with JEDEC standards
• JESD8C (2.7 V to 3.6 V)
• JESD7A (2.0 V to 6.0 V)
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. 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
74HC4538PW
-40 °C to +125 °C
TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
4. 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
Fig. 1.
Functional diagram
nB
nA
VCC
nREXT/CEXT
Vref1
enable
nCEXT
GND
nCD
power-on reset
VCC
Vref2
enable
nQ
nQ
mba338
GND
Fig. 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
9
aaa-026540
Fig. 3.
2Q
aaa-026542
Pin configuration SOT109-1 (SO16)
Fig. 4.
Pin configuration SOT403-1 (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
6. Functional description
Table 3. Function table
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.
Inputs
Outputs
nA
nB
nCD
↓
L
H
H
↑
H
X
X
L
74HC4538
Product data sheet
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Rev. 6 — 16 July 2021
nQ
nQ
L
H
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
(1)
(1)
(2)
(1)
nB input
(3)
nA input
(4)
nCD input
nREXT/CEXT input
Vref2
Vref1
Vref2
Vref1
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 Fig. 6).
Fig. 5.
Timing diagram
CEXT
GND
nCEXT
REXT
VCC
nREXT/CEXT
nA
nB
nQ
T
nQ
T = 0.7 × REXT × CEXT
nCD
Fig. 6.
001aak192
Connection of the external timing components REXT and CEXT
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
Conditions
Min
Max
Unit
-0.5
+7.0
V
VCC
supply voltage
IIK
input clamping current
VI < -0.5 V or VI > VCC + 0.5 V
[1]
-
±20
mA
IOK
output clamping current
VO < -0.5 V or VO > VCC + 0.5 V
[1]
-
±20
mA
IO
output current
VO = -0.5 V to VCC + 0.5 V
-
±25
mA
ICC
supply current
-
+50
mA
IGND
ground current
-50
-
mA
Tstg
storage temperature
-65
+150
°C
Ptot
total power dissipation
-
500
mW
[1]
[2]
Tamb = -40 °C to +125 °C
[2]
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
For SOT109-1 (SO16) package: Ptot derates linearly with 12.4 mW/K above 110 °C.
For SOT403-1 (TSSOP16) package: Ptot derates linearly with 8.5 mW/K above 91 °C.
74HC4538
Product data sheet
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Rev. 6 — 16 July 2021
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
8. Recommended operating conditions
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter
Conditions
VCC
supply voltage
VI
input voltage
VO
output voltage
Tamb
ambient temperature
Δt/ΔV
input transition rise and fall rate
Min
Typ
Max
Unit
2.0
5.0
6.0
V
0
-
VCC
V
0
-
VCC
V
-40
-
+125
°C
VCC = 2.0 V
-
-
625
ns/V
VCC = 4.5 V
-
1.67
139
ns/V
VCC = 6.0 V
-
-
83
ns/V
9. Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
VIH
VIL
VOH
VOL
II
Conditions
25 °C
-40 °C to +125 °C
Unit
Min
Typ
Max
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
HIGH-level
input voltage
LOW-level
input voltage
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 VI = VCC or GND;
VCC = 6.0 V
current
pin nREXT/CEXT;
VI = 2.0 V or GND;
other inputs at VCC or GND;
VCC = 6.0 V [1]
ICC
-40 °C to +85 °C
supply current VI = VCC or GND; IO = 0 A;
VCC = 6.0 V
74HC4538
Product data sheet
-
-
±0.1
-
±1
-
±1
μA
-
-
±50
-
±500
-
±500
nA
-
-
8.0
-
80
-
160
μA
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
Symbol Parameter
CI
[1]
Conditions
25 °C
input
capacitance
-40 °C to +85 °C
-40 °C to +125 °C
Min
Typ
Max
Min
Max
Min
Max
-
3.5
-
-
-
-
-
Unit
pF
This measurement can only be carried out after a trigger pulse is applied.
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); for test circuit see Fig. 9.
Symbol Parameter
Conditions
25 °C
-40 °C to +85 °C
Min Typ[1] Max
tPLH
LOW to HIGH nA, nB to nQ; see Fig. 7
propagation
VCC = 2.0 V
delay
VCC = 4.5 V
-40 °C to +125 °C Unit
Min
Max
Min
Max
-
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
VCC = 6.0 V
-
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
nCD to nQ; see Fig. 7
tPHL
HIGH to LOW nA, nB to nQ; see Fig. 7
propagation
VCC = 2.0 V
delay
VCC = 4.5 V
nCD to nQ; see Fig. 7
tt
transition time nQ and nQ; see Fig. 7
74HC4538
Product data sheet
[2]
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6 / 17
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
Symbol Parameter
Conditions
25 °C
-40 °C to +85 °C
Min Typ[1] Max
tW
pulse width
-40 °C to +125 °C Unit
Min
Max
Min
Max
nA LOW; see Fig. 8
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
VCC = 2.0 V
80
19
-
100
-
120
-
ns
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
nB HIGH; see Fig. 8
nCD LOW; see Fig. 8
nQ and nQ HIGH or LOW;
see Fig. 8
VCC = 5.0 V;
CEXT = 0.1 μF;
REXT = 10 kΩ
recovery time nCD to nA, nB;
see Fig. 8
trec
trtrig
retrigger time
REXT
external
timing
resistor
CEXT
external
timing
capacitor
CPD
power
dissipation
capacitance
[1]
[2]
[3]
nA, nB; see Fig. 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.
Fig. 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.
Fig. 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
Fig. 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
Product data sheet
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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 powered-down 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 Fig. 10
DEXT
CEXT
GND
nCEXT
REXT
VCC
nREXT/CEXT
001aak193
Fig. 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.
Fig. 11. Typical pulse width accuracy versus external capacitance
001aak197
1.6
normalized
K factor
(K)
1.2
1.0
REXT ×
CEXT
(tW)
0.84
1 nF
0.70
> 100 nF
0.8
0.6
103
1.12
0.56
104
105
REXT (Ω)
0.42
106
VCC = 4.5 V; Tamb = 25 °C.
Fig. 12. Typical pulse width accuracy versus external resistance
74HC4538
Product data sheet
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Rev. 6 — 16 July 2021
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10 / 17
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
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.
Fig. 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.
Fig. 14. Typical pulse width accuracy versus power supply
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
VCC (V)
6
0.49
CEXT = 100 nF; Tamb = 25 °C.
Fig. 15. Typical pulse width accuracy versus power supply
74HC4538
Product data sheet
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11 / 17
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
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.
Fig. 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.
Fig. 17. Typical pulse width accuracy versus temperature
74HC4538
Product data sheet
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Rev. 6 — 16 July 2021
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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
Fig. 18. Package outline SOT109-1 (SO16)
74HC4538
Product data sheet
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Rev. 6 — 16 July 2021
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13 / 17
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
Fig. 19. Package outline SOT403-1 (TSSOP16)
74HC4538
Product data sheet
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Rev. 6 — 16 July 2021
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14 / 17
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.6
20210716
Product data sheet
-
Modifications:
•
•
•
74HC4538 v.5
20170317
Modifications:
•
•
74HC_HCT4538 v.4
20160224
Modifications:
•
74HC_HCT4538 v.3
20090608
Modifications:
•
•
•
•
•
•
•
74HC_HCT4538_CNV v.2
74HC4538
Product data sheet
74HC4538 v.5
Type number 74HC4538DB (SOT338-1/SSOP16) removed.
Section 2 updated.
Section 7: Derating values for Ptot total power dissipation updated.
Product data sheet
-
74HC_HCT4538 v.4
Type numbers 74HCT4538D, 74HCT4538DB, 74HCT4538PW removed.
Table 6: Maximum input leakage current for pins 1REXT/CEXT and 2REXT/CEXT
changed.
Product data sheet
-
74HC_HCT4538 v.3
Type numbers 74HC4538N and 74HCT4538N (SOT38-4) removed.
Product data sheet
-
74HC_HCT4538_CNV v.2
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: Fig. 9.
Quick reference data incorporated in to Section 9 and Section 10.
Package information added for DIP16, SO16, SSOP16 and TSSOP16 packages.
19970902
Product specification
-
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Rev. 6 — 16 July 2021
-
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15 / 17
74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
15. Legal information
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.
Data sheet status
Quick reference data — The Quick reference data is an extract of the
product data given in the Limiting values and Characteristics sections of this
document, and as such is not complete, exhaustive or legally binding.
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 https://www.nexperia.com.
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.
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
systems or equipment, nor in applications where failure or malfunction
of an Nexperia product can reasonably be expected to result in personal
74HC4538
Product data sheet
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.
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 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.
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.
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74HC4538
Nexperia
Dual retriggerable precision monostable multivibrator
Contents
1. General description...................................................... 1
2. Features and benefits.................................................. 1
3. Ordering information....................................................1
4. Functional diagram.......................................................2
5. Pinning information......................................................3
5.1. Pinning.........................................................................3
5.2. Pin description............................................................. 3
6. Functional description................................................. 3
7. Limiting values............................................................. 4
8. Recommended operating conditions..........................5
9. Static characteristics....................................................5
10. Dynamic characteristics............................................ 6
10.1. Waveforms and test circuit........................................ 8
11. Application information............................................10
11.1. Power-down considerations..................................... 10
11.2. Graphs..................................................................... 10
12. Package outline........................................................ 13
13. Abbreviations............................................................ 15
14. Revision history........................................................15
15. Legal information......................................................16
©
Nexperia B.V. 2021. 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: 16 July 2021
74HC4538
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 16 July 2021
©
Nexperia B.V. 2021. All rights reserved
17 / 17