HEF4538B
Dual precision monostable multivibrator
Rev. 11 — 19 October 2018
Product data sheet
1. General description
The HEF4538B is a dual retriggerable-resettable monostable multivibrator. Each multivibrator has
an active LOW trigger/retrigger input (nA), an active HIGH trigger/retrigger input (nB), an overriding
active LOW direct reset input (nCD), an output (nQ) and its complement (nQ), and two pins
(nREXT/CEXT, and nCEXT, always connected to ground) for connecting the external timing
components CEXT and REXT. Typical pulse width variation over the specified temperature range is
±0.2 %.
The multivibrator may be triggered by either the positive or the negative edges of the input pulse
and will produce an accurate output pulse with a pulse width range of 10 μs to infinity. 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 REXT × CEXT. The linear design techniques in
LOCMOS (Local Oxide CMOS) guarantee precise control of the output pulse width. A LOW level at
nCD terminates the output pulse immediately. The trigger inputs’ Schmitt trigger action makes the
circuit highly tolerant of slower rise and fall times.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually
ground). Unused inputs must be connected to VDD, VSS, or another input.
2. Features and benefits
•
•
•
•
•
•
Tolerant of slow trigger rise and fall times
Fully static operation
5 V, 10 V, and 15 V parametric ratings
Standardized symmetrical output characteristics
Specified from -40 °C to +85 °C and -40 °C to +125 °C
Complies with JEDEC standard JESD 13-B
3. Ordering information
Table 1. Ordering information
Type number
Package
HEF4538BT
Temperature range
Name
Description
Version
-40 °C to +125 °C
SO16
plastic small outline package; 16 leads; body
width 3.9 mm
SOT109-1
HEF4538B
Nexperia
Dual 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
VDD
nREXT/CEXT
Vref1
enable
nCEXT
nQ
VSS
nCD
nQ
Vref2
enable
001aae734
Fig. 2.
Logic diagram (one multivibrator)
HEF4538B
Product data sheet
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Rev. 11 — 19 October 2018
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Nexperia B.V. 2018. All rights reserved
2 / 14
HEF4538B
Nexperia
Dual precision monostable multivibrator
5. Pinning information
5.1. Pinning
HEF4538B
1CEXT
1
16 VDD
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
VSS
8
9
2Q
001aae733
Fig. 3.
Pin configuration SOT109-1 (SO16)
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)
VSS
8
ground supply voltage
VDD
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 pulse 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
HEF4538B
Product data sheet
nQ
nQ
L
H
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3 / 14
HEF4538B
Nexperia
Dual precision monostable multivibrator
(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) T = REXT x CEXT.
Fig. 4.
Timing diagram
CEXT
nCEXT
REXT
nREXT/CEXT
T
nQ
T = REXT × CEXT
nA
nB
nQ
nCD
Fig. 5.
VDD
001aae735
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 VSS = 0 V (ground)
Symbol
Parameter
VDD
supply voltage
IIK
input clamping current
VI
input voltage
IOK
output clamping current
II/O
input/output current
IDD
supply current
Tstg
Min
Max
Unit
-0.5
+18
V
-
±10
mA
-0.5
VDD + 0.5
-
±10
mA
-
±10
mA
-
50
mA
storage temperature
-65
+150
°C
Tamb
ambient temperature
-40
+125
°C
Ptot
total power dissipation
Tamb = -40 °C to +125 °C
-
500
mW
P
power dissipation
per output
-
100
mW
[1]
Conditions
VI < -0.5 V or VI > VDD + 0.5 V
VI < -0.5 V or VI > VDD + 0.5 V
[1]
V
For SO16 package: Ptot derates linearly with 8 mW/K above 70 °C.
HEF4538B
Product data sheet
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4 / 14
HEF4538B
Nexperia
Dual precision monostable multivibrator
8. Recommended operating conditions
Table 5. Recommended operating conditions
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD
supply voltage
3
-
15
V
VI
input voltage
0
-
VDD
V
Tamb
ambient temperature
in free air
-40
-
+125
°C
Δt/ΔV
input transition rise and fall rate
VDD = 5 V
-
-
3.75
μs/V
VDD = 10 V
-
-
0.5
μs/V
VDD = 15 V
-
-
0.08
μs/V
9. Static characteristics
Table 6. Static characteristics
VSS = 0 V; VI = VSS or VDD unless otherwise specified.
Symbol Parameter
VIH
VIL
VOH
VOL
IOH
IOL
II
CI
Conditions
Max
Min
Max
Min
Max
5V
3.5
-
3.5
-
3.5
-
3.5
-
V
10 V
7.0
-
7.0
-
7.0
-
7.0
-
V
15 V
11.0
-
11.0
-
11.0
-
11.0
-
V
5V
-
1.5
-
1.5
-
1.5
-
1.5
V
10 V
-
3.0
-
3.0
-
3.0
-
3.0
V
15 V
-
4.0
-
4.0
-
4.0
-
4.0
V
5V
4.95
-
4.95
-
4.95
-
4.95
-
V
10 V
9.95
-
9.95
-
9.95
-
9.95
-
V
15 V
14.95
-
14.95
-
14.95
-
14.95
-
V
5V
-
0.05
-
0.05
-
0.05
-
0.05
V
10 V
-
0.05
-
0.05
-
0.05
-
0.05
V
15 V
-
0.05
-
0.05
-
0.05
-
0.05
V
VO = 2.5 V
5V
-
-1.7
-
-1.4
-
-1.1
-
-1.1
mA
VO = 4.6 V
5V
-
-0.64
-
-0.5
-
-0.36
-
-0.36 mA
VO = 9.5 V
10 V
-
-1.6
-
-1.3
-
-0.9
-
-0.9
mA
VO = 13.5 V
15 V
-
-4.2
-
-3.4
-
-2.4
-
-2.4
mA
VO = 0.4 V
5V
0.64
-
0.5
-
0.36
-
0.36
-
mA
VO = 0.5 V
10 V
1.6
-
1.3
-
0.9
-
0.9
-
mA
VO = 1.5 V
15 V
4.2
-
3.4
-
2.4
-
2.4
-
mA
nA, nB
15 V
-
±0.1
-
±0.1
-
±1.0
-
±1.0
μA
nREXT/CEXT
15 V
-
±0.3
-
±0.1
-
±1.0
-
±1.0
μA
-
-
-
-
7.5
-
-
-
-
|IO| < 1 μA
LOW-level
output current
input leakage
current
input
capacitance
HEF4538B
Product data sheet
Tamb = 85 °C Tamb = 125 °C Unit
Min
LOW-level
input voltage
HIGH-level
output current
Tamb = 25 °C
Max
|IO| < 1 μA
LOW-level
output voltage
Tamb = -40 °C
Min
HIGH-level
input voltage
HIGH-level
output voltage
VDD
|IO| < 1 μA
|IO| < 1 μA
All information provided in this document is subject to legal disclaimers.
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©
pF
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HEF4538B
Nexperia
Dual precision monostable multivibrator
Table 7. Typical static characteristics
VSS = 0 V; VI = VSS or VDD; Tamb = +25 °C.
Symbol
Parameter
Conditions
VDD
IDD
supply current
active state
5V
CI
[1]
input capacitance
nREXT/CEXT
Typ
[1]
Unit
55
μA
10 V
150
μA
15 V
220
μA
-
15
pF
Only one monostable is switching: for the specified current during the output pulse (output nQ is HIGH).
10. Dynamic characteristics
Table 8. Dynamic characteristics
VSS = 0 V; Tamb = 25 °C; for test circuit see Fig. 11.
Symbol Parameter
Conditions
VDD
Extrapolation formula[1]
tPHL
nA, nB to nQ; see Fig. 6
5V
HIGH to LOW
propagation
delay
nCD to nQ; see Fig. 6
tPLH
LOW to HIGH
propagation
delay
nA, nB to nQ; see Fig. 6
nCD to nQ; see Fig. 6
Min
Typ
Max
Unit
193 ns + (0.55 ns/pF) CL
-
220
440
ns
10 V
74 ns + (0.23 ns/pF) CL
-
85
190
ns
15 V
52 ns + (0.16 ns/pF) CL
-
60
120
ns
5V
98 ns + (0.55 ns/pF) CL
-
125
250
ns
10 V
44 ns + (0.23 ns/pF) CL
-
55
110
ns
15 V
32 ns + (0.16 ns/pF) CL
-
40
80
ns
5V
173 ns + (0.55 ns/pF) CL
-
200
460
ns
10 V
79 ns + (0.23 ns/pF) CL
-
90
180
ns
15 V
52 ns + (0.16 ns/pF) CL
-
60
120
ns
5V
98 ns + (0.55 ns/pF) CL
-
125
250
ns
10 V
44 ns + (0.23 ns/pF) CL
-
55
110
ns
32 ns + (0.16 ns/pF) CL
-
40
80
ns
[2] 10 ns + (1.00 ns/pF) CL
-
60
120
ns
15 V
tt
trec
trtrig
transition time
recovery time
retrigger time
HEF4538B
Product data sheet
5V
see Fig. 6
nCD to nA, nB; see Fig. 7
nQ, nQ to nA, nB;
see Fig. 7
10 V
9 ns + (0.42 ns/pF) CL
-
30
60
ns
15 V
6 ns + (0.28 ns/pF) CL
-
20
40
ns
5V
-
20
40
ns
10 V
-
10
20
ns
15 V
-
5
10
ns
5V
0
-
-
ns
10 V
0
-
-
ns
15 V
0
-
-
ns
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HEF4538B
Nexperia
Dual precision monostable multivibrator
Symbol Parameter
Conditions
VDD
tW
nA LOW; minimum width;
see Fig. 7
pulse width
Min
Typ
Max
5V
90
45
-
ns
10 V
30
15
-
ns
15 V
24
12
-
ns
5V
50
25
-
ns
10 V
24
12
-
ns
15 V
20
10
-
ns
nCD LOW; minimum width; 5 V
see Fig. 7
10 V
55
25
-
ns
25
12
-
ns
15 V
20
10
-
ns
5V
218
230
242
μs
10 V
213
224
235
μs
15 V
211
223
234
μs
nQ or nQ ; REXT = 100 kΩ; 5 V
CEXT = 0.1 μF; see Fig. 7 10 V
10.3
10.8
11.3
ms
10.2
10.7
11.2
ms
15 V
10.1
10.6
11.1
ms
5V
1.01
1.09
1.11
s
10 V
0.99
1.04
1.09
s
15 V
0.99
1.04
1.09
s
5V
-
±0.2
-
%
10 V
-
±0.2
-
%
15 V
-
±0.2
-
%
-
±1.5
-
%
5V
-
±1
-
%
10 V
-
±1
-
%
15 V
-
±1
-
%
nB HIGH;minimum width;
see Fig. 7
nQ or nQ; REXT = 100 kΩ;
CEXT =2.0 nF; see Fig. 7
nQ or nQ; REXT = 100 kΩ;
CEXT = 10 μF; see Fig. 7
ΔtW
pulse width
variation
nQ or nQ variation over
temperature range;
see Fig. 8
Extrapolation formula[1]
nQ or nQ variation over
VDD voltage range 5 V to
15 V; see Fig. 9
nQ or nQ variation
between monostables
in the same device;
REXT = 100 kΩ;
CEXT = 2 nF to 10 μF
Unit
REXT
external timing
resistor
5
-
[3]
kΩ
CEXT
external timing
capacitor
2000
-
no
limits
pF
[1]
[2]
[3]
The typical values of the propagation delay and transition times are calculated from the extrapolation formulas shown (CL in pF).
tt is the same as tTHL and tTLH.
The maximum permissible resistance REXT, which holds the specified accuracy of tW (nQ, nQ output), depends on the leakage current
of the capacitor CEXT and the leakage current of the HEF4538B.
HEF4538B
Product data sheet
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HEF4538B
Nexperia
Dual precision monostable multivibrator
10.1. Waveforms and test circuit
VI
tr
nB input
0V
VI
tf
90 %
VM
10 %
tW
tf
tr
90 %
nA input
10 %
0V
VM
tW
VI
VM
nCD input
0V
VOH
nQ output
tPLH
VM
VOL
VOH
nQ output
tPLH
90 %
VM
10 %
VM
tTHL
tPHL
tPHL
tTLH
tPHL
tPLH
90 %
VM
VOL
VM
10 %
tTHL
tTLH
001aae736
Measurement points are given in Table 9.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Fig. 6.
Waveforms showing propagation delays
Table 9. Measurement points
Supply voltage
Input
Output
VDD
VM
VM
5 V to 15 V
0.5VDD
0.5VDD
HEF4538B
Product data sheet
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HEF4538B
Nexperia
Dual precision monostable multivibrator
VI
nCD input
VM
0V
tW
trec
tW
VI
nA input
0V
tW
VI
nB input
0V
tretrig
VOH
nQ output
VM
VOL
tW
001aaj491
Measurement points are given in Table 9.
Recovery times are shown as positive values but may be specified as negative values.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Fig. 7.
Waveforms showing minimum nCD, nA, nB, and nQ pulse widths, recovery and retrigger times
001aae738
3
tW
(%)
001aae739
3
tW
(%)
2
(1)
2
(1)
1
1
(2)
0
(2)
0
(3)
(3)
-1
-2
-60
-1
-20
20
60
100
140
Tamb (°C)
-2
-60
-20
20
60
100
140
Tamb (°C)
a. REXT = 100 kΩ; CEXT = 100 nF
b. REXT = 100 kΩ; CEXT = 2 nF
(1) VDD = 5 V
(2) VDD = 10 V
(3) VDD = 15 V
ΔtW = 0 % at VDD = 10 V and Tamb = 25 °C
(1) VDD = 5 V
(2) VDD = 10 V
(3) VDD = 15 V
ΔtW = 0 % at VDD = 10 V and Tamb = 25 °C
Fig. 8.
Typical normalized change in output pulse width as a function of ambient temperature
HEF4538B
Product data sheet
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HEF4538B
Nexperia
Dual precision monostable multivibrator
001aae740
3
ΔtW
(%)
2
001aae741
103
(1)
IDD
(µA)
102
(2)
1
(1)
10
(2)
0
(3)
1
-1
-2
0
4
8
12
VDD (V)
10- 1
10- 2
16
10- 1
1
10
δ (%)
102
Tamb = 25 °C; ΔtW = 0 % at VDD = 10 V; REXT = 100 kΩ
(1) CEXT = 2 nF
(2) CEXT = 100 nF
REXT = 100 kΩ; CEXT = 100 nF; CL = 50 pF; one monostable
multivibrator switching only
(1) VDD = 15 V
(2) VDD = 10 V
(3) VDD = 5 V
Fig. 9.
Fig. 10. Total supply current as a function of the output
duty factor
Typical normalized change in output pulse
width as a function of the supply voltage
VI
negative
pulse
tW
90 %
90 %
VM
VM
10 %
0V
10 %
tf
tr
VI
positive
pulse
0V
tr
VDD
tf
90 %
G
90 %
VM
VI
VM
10 %
CL
RT
10 %
tW
VO
DUT
001aaj781
001aag182
a. Input waveforms
b. Test circuit
Test data is given in Table 10.
Definitions for test circuit:
DUT = Device Under Test.
CL = load capacitance including jig and probe capacitance.
RT = termination resistance should be equal to the output impedance Zo of the pulse generator.
Fig. 11. Test circuit for measuring switching times
Table 10. Test data
Supply voltage
Input
VDD
VI
tr, tf
CL
5 V to 15 V
VSS or VDD
≤ 20 ns
50 pF
HEF4538B
Product data sheet
Load
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10 / 14
HEF4538B
Nexperia
Dual precision monostable multivibrator
11. 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
0.01
0.019 0.0100 0.39
0.014 0.0075 0.38
0.16
0.15
0.039
0.016
0.028
0.020
inches
0.010 0.057
0.069
0.004 0.049
0.05
0.244
0.041
0.228
0.01
0.01
0.028
0.004
0.012
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. 12. Package outline SOT109-1 (SO16)
HEF4538B
Product data sheet
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©
Nexperia B.V. 2018. All rights reserved
11 / 14
HEF4538B
Nexperia
Dual precision monostable multivibrator
12. Abbreviations
Table 11. Abbreviations
Acronym
Description
CMOS
Complementary Metal-Oxide Semiconductor
DUT
Device Under Test
13. Revision history
Table 12. Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
HEF4538B v.11
20181019
Product data sheet
-
HEF4538B v.10
Modifications:
•
•
The format of this data sheet has been redesigned to comply with the identity guidelines of
Nexperia.
Legal texts have been adapted to the new company name where appropriate.
HEF4538B v.10
20160401
Modifications:
•
HEF4538B v.9
20131210
Modifications:
•
HEF4538B v.8
20111116
Product data sheet
-
HEF4538B v.7
HEF4538B v.7
20110217
Product data sheet
-
HEF4538B v.6
HEF4538B v.6
20091102
Product data sheet
-
HEF4538B v.5
HEF4538B v.5
20090304
Product data sheet
-
HEF4538B v.4
HEF4538B v.4
20090206
Product data sheet
-
HEF4538B_CNV v.3
HEF4538B_CNV v.3
19950101
Product specification
-
HEF4538B_CNV v.2
HEF4538B_CNV v.2
19950101
Product specification
-
-
HEF4538B
Product data sheet
Product data sheet
-
HEF4538B v.9
Type number HEF4538BP (SOT38-4) removed.
Product data sheet
-
HEF4538B v.8
Fig. 8 and Fig. 9 updated to show output pulse width over full temperature range.
All information provided in this document is subject to legal disclaimers.
Rev. 11 — 19 October 2018
©
Nexperia B.V. 2018. All rights reserved
12 / 14
HEF4538B
Nexperia
Dual precision monostable multivibrator
14. 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
HEF4538B
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.
Rev. 11 — 19 October 2018
©
Nexperia B.V. 2018. All rights reserved
13 / 14
HEF4538B
Nexperia
Dual 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. Package outline........................................................ 11
12. Abbreviations............................................................ 12
13. Revision history........................................................12
14. Legal information......................................................13
©
Nexperia B.V. 2018. 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: 19 October 2018
HEF4538B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 11 — 19 October 2018
©
Nexperia B.V. 2018. All rights reserved
14 / 14
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