HEF4538BT,653 - NEXPERIA - searchdatasheet.com

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

PackageType number

Temperature range Name Description Version

HEF4538BT -40 °C to +125 °C SO16 plastic small outline package; 16 leads; body

width 3.9 mm

SOT109-1

Nexperia HEF4538B

Dual precision monostable multivibrator

4. Functional diagram

001aae727

1CEXT

1REXT/CEXT

1CD

2CEXT

2REXT/CEXT

2CD

Fig. 1. Functional diagram

nREXT/CEXT

VDD

nCEXT

VSS

Vref1 enable

enable

nCD

Vref2

001aae734

Fig. 2. Logic diagram (one multivibrator)

Product data sheet Rev. 11 — 19 October 2018 2 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

5. Pinning information

5.1. Pinning

HEF4538B

1CEXT VDD

1REXT/CEXT 2CEXT

1CD 2REXT/CEXT

1B 2CD

1A 2B

1Q 2A

1Q 2Q

VSS 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 nQ nQ

↓ L H

H ↑ H

X X L L H

Product data sheet Rev. 11 — 19 October 2018 3 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

001aae737

(1)

(3)

(5)

(4)

(1)(2)(1)

Vref1

Vref2 Vref2

Vref1

T T

nA input

nB input

nCD input

nREXT/CEXT input

nQ output

(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

001aae735

nCD

nCEXT

VDD

nREXT/CEXT

REXT

CEXT

nQ T

T = REXT × CEXT

Fig. 5. 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 Conditions Min Max Unit

VDD supply voltage -0.5 +18 V

IIK input clamping current VI < -0.5 V or VI > VDD + 0.5 V - ±10 mA

VIinput voltage -0.5 VDD + 0.5 V

IOK output clamping current VI < -0.5 V or VI > VDD + 0.5 V - ±10 mA

II/O input/output current - ±10 mA

IDD supply current - 50 mA

Tstg storage temperature -65 +150 °C

Tamb ambient temperature -40 +125 °C

Ptot total power dissipation Tamb = -40 °C to +125 °C [1] - 500 mW

P power dissipation per output - 100 mW

[1] For SO16 package: Ptot derates linearly with 8 mW/K above 70 °C.

Product data sheet Rev. 11 — 19 October 2018 4 / 14

Nexperia HEF4538B

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

VIinput voltage 0 - VDD V

Tamb ambient temperature in free air -40 - +125 °C

VDD = 5 V - - 3.75 μs/V

VDD = 10 V - - 0.5 μs/V

Δt/ΔV input transition rise and fall rate

VDD = 15 V - - 0.08 μs/V

9. Static characteristics

Table 6. Static characteristics

VSS = 0 V; VI = VSS or VDD unless otherwise specified.

Tamb = -40 °C Tamb = 25 °C Tamb = 85 °C Tamb = 125 °CSymbol Parameter Conditions VDD

Min Max Min Max Min Max Min Max

Unit

5 V 3.5 - 3.5 - 3.5 - 3.5 - V

10 V 7.0 - 7.0 - 7.0 - 7.0 - V

VIH HIGH-level

input voltage

|IO| < 1 μA

15 V 11.0 - 11.0 - 11.0 - 11.0 - V

5 V - 1.5 - 1.5 - 1.5 - 1.5 V

10 V - 3.0 - 3.0 - 3.0 - 3.0 V

VIL LOW-level

input voltage

|IO| < 1 μA

15 V - 4.0 - 4.0 - 4.0 - 4.0 V

5 V 4.95 - 4.95 - 4.95 - 4.95 - V

10 V 9.95 - 9.95 - 9.95 - 9.95 - V

VOH HIGH-level

output voltage

|IO| < 1 μA

15 V 14.95 - 14.95 - 14.95 - 14.95 - V

5 V - 0.05 - 0.05 - 0.05 - 0.05 V

10 V - 0.05 - 0.05 - 0.05 - 0.05 V

VOL LOW-level

output voltage

|IO| < 1 μA

15 V - 0.05 - 0.05 - 0.05 - 0.05 V

VO = 2.5 V 5 V - -1.7 - -1.4 - -1.1 - -1.1 mA

VO = 4.6 V 5 V - -0.64 - -0.5 - -0.36 - -0.36 mA

VO = 9.5 V 10 V - -1.6 - -1.3 - -0.9 - -0.9 mA

IOH HIGH-level

output current

VO = 13.5 V 15 V - -4.2 - -3.4 - -2.4 - -2.4 mA

VO = 0.4 V 5 V 0.64 - 0.5 - 0.36 - 0.36 - mA

VO = 0.5 V 10 V 1.6 - 1.3 - 0.9 - 0.9 - mA

IOL LOW-level

output current

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 μAIIinput leakage

current nREXT/CEXT 15 V - ±0.3 - ±0.1 - ±1.0 - ±1.0 μA

CIinput

capacitance

- - - - 7.5 - - - - pF

Product data sheet Rev. 11 — 19 October 2018 5 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

Table 7. Typical static characteristics

VSS = 0 V; VI = VSS or VDD; Tamb = +25 °C.

Symbol Parameter Conditions VDD Typ Unit

5 V [1] 55 μA

10 V 150 μA

IDD supply current active state

15 V 220 μA

CIinput capacitance nREXT/CEXT - 15 pF

[1] 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] Min Typ Max Unit

5 V 193 ns + (0.55 ns/pF) CL- 220 440 ns

10 V 74 ns + (0.23 ns/pF) CL- 85 190 ns

nA, nB to nQ; see Fig. 6

15 V 52 ns + (0.16 ns/pF) CL- 60 120 ns

5 V 98 ns + (0.55 ns/pF) CL- 125 250 ns

10 V 44 ns + (0.23 ns/pF) CL- 55 110 ns

tPHL HIGH to LOW

propagation

delay

nCD to nQ; see Fig. 6

15 V 32 ns + (0.16 ns/pF) CL- 40 80 ns

5 V 173 ns + (0.55 ns/pF) CL- 200 460 ns

10 V 79 ns + (0.23 ns/pF) CL- 90 180 ns

nA, nB to nQ; see Fig. 6

15 V 52 ns + (0.16 ns/pF) CL- 60 120 ns

5 V 98 ns + (0.55 ns/pF) CL- 125 250 ns

10 V 44 ns + (0.23 ns/pF) CL- 55 110 ns

tPLH LOW to HIGH

propagation

delay

nCD to nQ; see Fig. 6

15 V 32 ns + (0.16 ns/pF) CL- 40 80 ns

5 V [2] 10 ns + (1.00 ns/pF) CL- 60 120 ns

10 V 9 ns + (0.42 ns/pF) CL- 30 60 ns

tttransition time see Fig. 6

15 V 6 ns + (0.28 ns/pF) CL- 20 40 ns

5 V - 20 40 ns

10 V - 10 20 ns

trec recovery time nCD to nA, nB; see Fig. 7

15 V - 5 10 ns

5 V 0 - - ns

10 V 0 - - ns

trtrig retrigger time nQ, nQ to nA, nB;

see Fig. 7

15 V 0 - - ns

Product data sheet Rev. 11 — 19 October 2018 6 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

Symbol Parameter Conditions VDD Extrapolation formula[1] Min Typ Max Unit

5 V 90 45 - ns

10 V 30 15 - ns

nA LOW; minimum width;

see Fig. 7

15 V 24 12 - ns

5 V 50 25 - ns

10 V 24 12 - ns

nB HIGH;minimum width;

see Fig. 7

15 V 20 10 - ns

5 V 55 25 - ns

10 V 25 12 - ns

nCD LOW; minimum width;

see Fig. 7

15 V 20 10 - ns

5 V 218 230 242 μs

10 V 213 224 235 μs

nQ or nQ; REXT = 100 kΩ;

CEXT =2.0 nF; see Fig. 7

15 V 211 223 234 μs

5 V 10.3 10.8 11.3 ms

10 V 10.2 10.7 11.2 ms

nQ or nQ ; REXT = 100 kΩ;

CEXT = 0.1 μF; see Fig. 7

15 V 10.1 10.6 11.1 ms

5 V 1.01 1.09 1.11 s

10 V 0.99 1.04 1.09 s

tWpulse width

nQ or nQ; REXT = 100 kΩ;

CEXT = 10 μF; see Fig. 7

15 V 0.99 1.04 1.09 s

5 V - ±0.2 - %

10 V - ±0.2 - %

nQ or nQ variation over

temperature range;

see Fig. 8

15 V - ±0.2 - %

nQ or nQ variation over

VDD voltage range 5 V to

15 V; see Fig. 9

- ±1.5 - %

5 V - ±1 - %

10 V - ±1 - %

ΔtWpulse width

variation

nQ or nQ variation

between monostables

in the same device;

REXT = 100 kΩ;

CEXT = 2 nF to 10 μF

15 V - ±1 - %

REXT external timing

resistor

5 - [3] kΩ

CEXT external timing

capacitor

2000 - no

limits

[1] The typical values of the propagation delay and transition times are calculated from the extrapolation formulas shown (CL in pF).

[2] tt is the same as tTHL and tTLH.

[3] 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.

Product data sheet Rev. 11 — 19 October 2018 7 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

10.1. Waveforms and test circuit

001aae736

trtf

VMVM

tPLH

nB input

nA input

nCD input

nQ output

10 %

90 %

tPLH tPHL

tPHL tPHL tPLH

tTHL tTLH

10 %

90 %

tTHL tTLH

10 %

90 %

0 V

VOH

VOL

VOH

VOL

0 V

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 VMVM

5 V to 15 V 0.5VDD 0.5VDD

Product data sheet Rev. 11 — 19 October 2018 8 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

001aaj491

nCD input

nA input

nB input

tWtrec tW

tretrig

VOH

0 V

VOL

nQ output

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

Tamb (°C)

-60 14010020 60-20

001aae738

-1

(%)

-2

(3)

(2)

(1)

Tamb (°C)

-60 14010020 60-20

001aae739

-1

(%)

-2

(1)

(2)

(3)

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

Product data sheet Rev. 11 — 19 October 2018 9 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

VDD (V)

0 16124 8

001aae740

- 1

ΔtW

(%)

- 2

(1)

(2)

001aae741

δ (%)

10- 2 102

1010- 1 1

102

103

IDD

(µA)

10- 1

(1)

(2)

(3)

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. Typical normalized change in output pulse

width as a function of the supply voltage

Fig. 10. Total supply current as a function of the output

duty factor

VMVM

10 %

90 %

10 %

90 %

0 V

negative

pulse

positive

pulse

0 V

VMVM

90 %

10 %

90 %

10 %

001aaj781

a. Input waveforms

VDD

VIVO

001aag182

DUT

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 Load

VDD VItr, tfCL

5 V to 15 V VSS or VDD ≤ 20 ns 50 pF

Product data sheet Rev. 11 — 19 October 2018 10 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

11. Package outline

w M

detail X

v M A

(A )

pin 1 index

UNIT A

max. A

1 A

2 A

3 b

p c D

(1) E

(1) (1)

e H

E L L

p Q Z y w v θ

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION ISSUE DATE

IEC JEDEC JEITA

inches

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

0.7

0.6

0.7

0.3 8

0.25 0.1

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

1.0

0.4

SOT109-1 99-12-27

03-02-19

076E07 MS-012

0.069 0.010

0.004

0.057

0.049 0.01 0.019

0.014

0.0100

0.0075

0.39

0.38

0.16

0.15 0.05

1.05

0.041

0.244

0.228

0.028

0.020

0.028

0.012

0.01

0.25

0.01 0.004

0.039

0.016

0 2.5 5 mm

scale

SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

Fig. 12. Package outline SOT109-1 (SO16)

Product data sheet Rev. 11 — 19 October 2018 11 / 14

Nexperia HEF4538B

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 Product data sheet - HEF4538B v.9

Modifications: •Type number HEF4538BP (SOT38-4) removed.

HEF4538B v.9 20131210 Product data sheet - HEF4538B v.8

Modifications: •Fig. 8 and Fig. 9 updated to show output pulse width over full temperature range.

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 - -

Product data sheet Rev. 11 — 19 October 2018 12 / 14

Nexperia HEF4538B

Dual precision monostable multivibrator

14. Legal information

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] Please consult the most recently issued document before initiating or

completing a design.

[2] The term 'short data sheet' is explained in section "Definitions".

[3] 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

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.

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.

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.

Product data sheet Rev. 11 — 19 October 2018 13 / 14

Nexperia HEF4538B

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

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

Product data sheet Rev. 11 — 19 October 2018 14 / 14