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 R EXT.
Typical pulse width variation ov er the sp ec ified tem p er at ur e ra ng e is 0.2 %.
The multivibrator may be triggered by either the positive or the n egative edges of the input
pulse and will produce an accurate output pulse with a pulse width range of 10 s 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 de sign techniqu es in LOCMOS (L ocal Oxide CMOS) guaran tee precise contr ol
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 r ange of 3 V to 1 5 V referenced to VSS
(usually ground). Unused inputs must be connected to VDD, VSS, or another input.
2. Features and benefits
Tolerant of slow trigg er 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
HEF4538B
Dual precision monostable multivibrator
Rev. 8 — 16 November 2011 Product data sheet
Table 1. Ordering information
All types operate from
40
C to +125
C.
Type number Package
Name Description Version
HEF4538BP DIP16 plastic dual in-line package; 16 leads (300 mil) SOT38-4
HEF4538BT SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
HEF4538B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 8 — 16 November 2011 2 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
4. Functional diagram
Fig 1. Functional di agram
001aae727
1A
1CEXT
1REXT/CEXT
7
6
1Q
1Q
1B
1CD
5
1
2
4
3
2A
2CEXT
2REXT/CEXT
9
10
2Q
2Q
2B
2CD
11
15
14
12
13
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Product data sheet Rev. 8 — 16 November 2011 3 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
5. Pinning information
5.1 Pinning
Fig 2. Logic diagram (one multi vi brator)
nB
nA
nREXT/CEXT
VDD
nCEXT
VSS
Vref1 enable
enable
nCD
Vref2
nQ
nQ
001aae734
Fig 3. Pin configuratio n
HEF4538B
1CEXT V
DD
1REXT/CEXT 2CEXT
1CD 2REXT/CEXT
1B 2CD
1A 2B
1Q 2A
1Q 2Q
V
SS
2Q
001aae733
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
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Product data sheet Rev. 8 — 16 November 2011 4 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
5.2 Pin description
6. Functional description
[1] 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.
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
Table 3. Function table
Inputs Outputs
nA nB nCD nQ nQ
LH
HH
XXLLH
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Product data sheet Rev. 8 — 16 November 2011 5 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
7. Limiting values
(1) Positive edge triggering.
(2) Positive edge re-triggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) T = REXT CEXT.
Fig 4. Timing diagram
001aae737
(1)
(3)
(5)
(4)
(1)(2)(1)
Vref1
T
Vref2 Vref2
Vref1
TT
nA input
nB input
nCD input
nREXT/CEXT input
nQ output
Fig 5. Connection of the external timing components REXT and CEXT
001aae735
nCD
nA
nB
nCEXT
VDD
nREXT/CEXT
REXT
CEXT
nQ
nQ T
T = REXT × CEXT
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
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Product data sheet Rev. 8 — 16 November 2011 6 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
[1] For DIP16 package: Ptot derates linearly with 12 mW/K above 70 C.
[2] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
8. Recommended operating conditions
9. Static characteristics
Tamb ambient temperature 40 +125 C
Ptot total power dissipation Tamb = 40 C to +125 C
DIP16 package [1] -750mW
SO16 package [2] -500mW
P power dissipation per output - 100 mW
Table 4. Limiting values …continued
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to VSS = 0 V (ground)
Symbol Parameter Conditions Min Max Unit
Table 5. Recommended operating con ditions
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
t/V input transition rise and fall rate VDD = 5 V --3.75s/V
VDD = 10 V --0.5s/V
VDD = 15 V --0.08s/V
Table 6. Static characteristics
VSS = 0 V; VI = VSS or VDD unless otherwi se specified.
Symbol Parameter Conditions VDD Tamb = 40 C Tamb = 25 C Tamb = 85 C Tamb = 125 CUnit
Min Max Min Max Min Max Min Max
VIH HIGH-level
input voltage IO < 1 A 5 V 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
VIL LOW-level
input voltage IO < 1 A 5 V - 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
VOH HIGH-level
output voltage IO < 1 A 5 V 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
VOL LOW-level
output voltage IO < 1 A 5 V - 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
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Product data sheet Rev. 8 — 16 November 2011 7 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
[1] Only one monostable is switching: for the specified current during the output pulse (output nQ is HIGH).
10. Dynamic characteristics
IOH HIGH-level
output current 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
VO = 13.5 V 15 V - 4.2 - 3.4 - 2.4 - 2.4 mA
IOL LOW-level
output current 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
VO = 1.5 V 15 V 4.2 - 3.4 - 2.4 - 2.4 - mA
IIinput leakage
current nREXT/CEXT 15 V - 0.1 - 0.1 - 1.0 - 1.0 A
CIinput
capacitance ----7.5----pF
Table 6. Static characteristics …continued
VSS = 0 V; VI = VSS or VDD unless otherwi se specified.
Symbol Parameter Conditions VDD Tamb = 40 C Tamb = 25 C Tamb = 85 C Tamb = 125 CUnit
Min Max Min Max Min Max Min Max
Table 7. Typical static cha racteristics
VSS = 0 V; VI = VSS or VDD; Tamb = +25
C.
Symbol Parameter Conditions VDD Typ Unit
IDD supply current active state 5 V [1] 55 A
10 V 150 A
15 V 220 A
CIinput capacitance nREXT/CEXT - 15 pF
Table 8. Dynamic characteristics
VSS = 0 V; Tamb = 25
C; for test circuit see Figure 11.
Symbol Parameter Conditions VDD Extrapolation formula[1] Min Typ Max Unit
tPHL HIGH to LOW
propagation
delay
nA, nB to nQ;
see Figure 6 5 V 19 3 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
nCD to nQ; see Figure 6 5 V 9 8 ns + (0.55 ns/pF) C L- 125 250 ns
10 V 44 ns + (0.23 ns/pF) CL-55110ns
15 V 32 ns + (0.16 ns/pF) CL-4080ns
tPLH LOW to HIGH
propagation
delay
nA, nB to nQ;
see Figure 6 5 V 17 3 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
nCD to nQ; see Figure 6 5 V 98 ns + (0.5 5 ns/pF) CL- 125 250 ns
10 V 44 ns + (0.23 ns/pF) CL-55110ns
15 V 32 ns + (0.16 ns/pF) CL-4080ns
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Product data sheet Rev. 8 — 16 November 2011 8 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
[1] The typical values of the propagation delay and transition times are calculated from the extrapolation formulas shown (CL in pF).
[2] 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 th e leakage of the HEF4538B.
trec recovery time nCD to nA, nB;
see Figure 7 5 V - 20 40 ns
10 V - 10 20 ns
15 V - 5 10 ns
trtrig retrigger time nQ, nQ to nA, nB;
see Figure 7 5 V 0 - - ns
10 V 0 - - ns
15 V 0 - - ns
tWpulse width nA LOW; minimum width;
see Figure 7 5 V 90 45 - ns
10 V 30 15 - ns
15 V 24 12 - ns
nB HIGH;
minimum width;
see Figure 7
5 V 50 25 - ns
10 V 24 12 - ns
15 V 20 10 - ns
nCD LOW;
minimum width;
see Figure 7
5 V 55 25 - ns
10 V 25 12 - ns
15 V 20 10 - ns
nQ or nQ;
REXT = 100 k;
CEXT =2.0 nF;
see Figure 7
5 V 218 230 242 s
10 V 213 22 4 2 35 s
15 V 211 223 234 s
nQ or nQ ;
REXT = 100 k;
CEXT =0.1F;
see Figure 7
5 V 10.3 10.8 11.3 ms
10 V 10.2 10.7 11.2 ms
15 V 10.1 10.6 11.1 ms
nQ or nQ;
REXT = 100 k;
CEXT = 10 F;
see Figure 7
5 V 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
tWpulse width
variation nQ or nQ variation over
temperature range;
see Figure 8
5 V - 0.2 - %
10 V - 0.2 - %
15 V - 0.2 - %
nQ or nQ variation over
VDD voltage range
5 V to 15 V; see Figure 9
-1.5 - %
nQ or nQ variation
between monostables in
the same device;
REXT = 100 k;
CEXT = 2 nF to 10 F
5 V - 1- %
10 V - 1- %
15 V - 1- %
REXT external timing
resistor 5- [2] k
CEXT external timing
capacitor 2000 - no
limits pF
Table 8. Dynamic characteristics …continued
VSS = 0 V; Tamb = 25
C; for test circuit see Figure 11.
Symbol Parameter Conditions VDD Extrapolation formula[1] Min Typ Max Unit
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Product data sheet Rev. 8 — 16 November 2011 9 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
11. Waveforms
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
001aae736
VM
tW
trtf
VMVM
VM
tW
VM
tPLH
VM
nB input
nA input
nCD input
nQ output
nQ output
tr
10 %
90 %
tf
tPLH tPHL
tPHL tPHL tPLH
10 %
90 %
VI
0 V
VI
0 V
VI
VOH
VOL
VOH
VOL
0 V
Table 9. Measur ement points
Supply voltage Input Output
VDD VMVM
5 V to 15 V 0.5VDD 0.5VDD
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Product data sheet Rev. 8 — 16 November 2011 10 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
Measurement points are given in Table 9.
Set-up and 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 nA, nB, and nQ pulse widths and set-up, recovery and retrigger times
001aaj491
nCD input
nA input
nB input
t
W
t
rec
t
W
t
W
t
su
V
M
V
I
V
M
V
M
V
M
t
su
t
W
t
retrig
V
I
V
I
V
OH
0 V
0 V
0 V
V
OL
nQ output
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Product data sheet Rev. 8 — 16 November 2011 11 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
a. REXT = 100 k; CEXT = 100 nF b. REXT = 100 k; CEXT = 2 nF
(1) VDD = 5 V.
(2) VDD = 10 V.
(3) VDD = 15 V.
tW = 0 % at VDD = 10 V and Tamb = 25 C
Fig 8. Typic al normal ize d change in output pulse width as a function of ambient temper ature
Tamb (°C)
−80 10080040−40
001aae738
0
1
−1
2
3
ΔtW
(%)
−2
(3)
(2)
(1)
Tamb (°C)
−80 10080040−40
001aae739
0
1
−1
2
3
ΔtW
(%)
−2
(1)
(2)
(3)
Tamb = 25 C; tW = 0 % at VDD = 10 V; REXT = 100 k
(1) CEXT = 2 nF.
(2) CEXT = 100 nF.
REXT = 100 k; CEXT = 100 nF; CL=50pF;
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. T o tal supply current as a function of the outp ut
duty factor
VDD (V)
0161248
001aae740
0
1
−1
2
3
ΔtW
(%)
−2
(1)
(2)
001aae741
δ (%)
10−2102
1010−11
1
10
102
103
IDD
(μA)
10−1
(1)
(2)
(3)
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Product data sheet Rev. 8 — 16 November 2011 12 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
Test data is given in Table 10.
Definitions for test circuit:
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 circui t
Table 10. Test data
Supply voltage Input Load
VDD VItr, tfCL
5 V to 15 V VSS or VDD 20 ns 50 pF
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Product data sheet Rev. 8 — 16 November 2011 13 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
12. Package outline
Fig 12. Package outline SOT38-4 (DIP16)
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
SOT38-4 95-01-14
03-02-13
MH
c
(e )
1
ME
A
L
seating plane
A1
wM
b1
b2
e
D
A2
Z
16
1
9
8
E
pin 1 index
b
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
UNIT A
max. 12 b1(1) (1) (1)
b2cD E e M Z
H
L
mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
min. A
max. bmax.
w
ME
e1
1.73
1.30 0.53
0.38 0.36
0.23 19.50
18.55 6.48
6.20 3.60
3.05 0.2542.54 7.62 8.25
7.80 10.0
8.3 0.764.2 0.51 3.2
inches 0.068
0.051 0.021
0.015 0.014
0.009
1.25
0.85
0.049
0.033 0.77
0.73 0.26
0.24 0.14
0.12 0.010.1 0.3 0.32
0.31 0.39
0.33 0.030.17 0.02 0.13
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
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Product data sheet Rev. 8 — 16 November 2011 14 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
Fig 13. Package outline SOT109-1 (SO16)
X
wM
θ
A
A1
A2
bp
D
HE
Lp
Q
detail X
E
Z
e
c
L
vMA
(A )
3
A
8
9
1
16
y
pin 1 index
UNIT A
max. A1A2A3bpcD
(1) E(1) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
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
o
o
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
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Product data sheet Rev. 8 — 16 November 2011 15 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
13. Abbreviations
14. Revision history
Table 11. Abbreviations
Acronym Description
DUT Device Under Test
Table 12. Revision history
Document ID Release date Data sheet status Change notice Supersedes
HEF4538B v.8 20111116 Product data sheet - HEF4538B v.7
Modifications: •Legal pages updated.
•Changes in “General description” and “Features and benefits”.
•Section “Applications” removed.
HEF4538B v.7 20110217 Produ ct data sheet - HEF4538B v.6
HEF4538B v.6 20091102 Produ ct data sheet - HEF4538B v.5
HEF4538B v.5 20090304 Product data sheet - HEF4538B v.4
HEF4538B v.4 20090206 Product data sheet - HEF45 38B_CNV v.3
HEF4538B_CNV v.3 19950101 Product specification - HEF4538B_CNV v.2
HEF4538B_CNV v.2 19950101 Product specification - -
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Product data sheet Rev. 8 — 16 November 2011 16 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
15. Legal information
15.1 Data sheet status
[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 de vice(s) descr ibed in th is docume nt may have cha nged since this docume nt was publis hed and ma y dif fer in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.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. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liab ility 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 tit le. A short data sh eet is intended
for quick reference only and shou ld not be rel ied u pon to cont ain det ailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall pre vail.
Product specificat ion — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
NXP Semiconductors and its customer, unless NXP Semiconductors and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the NXP Semiconductors product is
deemed to off er functions and qualities beyond those described in the
Product data sheet.
15.3 Disclaimers
Limited warr a nty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors 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.
In no event shall NXP Semiconductors be liable for any indirect, incidenta l ,
punitive, special or consequ ential damages (including - wit hout limitatio n - 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, NXP Semiconduct ors’ aggregate and cumulat ive liability toward s
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors 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 informa tion supplied prior
to the publication hereof .
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suit able for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors pro duct can reasonably be expected
to result in perso nal injury, death or severe property or environmental
damage. NXP Semiconductors accepts no liab ility for inclusion and/or use of
NXP Semiconductors 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. NXP Semico nductors makes no
representation or warranty tha t such application s will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using NXP Semiconductors product s, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suit able and fit for the custome r’s applications and
products planned, as well as fo r the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associate d with t heir
applications and products.
NXP Semiconductors does not accept any liabili ty 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 necessa ry
testing for th e customer’s applications and pro ducts using NXP
Semiconductors 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). NXP 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 permanent ly and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — NXP Semiconductors
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nxp.com/profile/terms, unless otherwise
agreed in a valid written individua l agreement. In case an individual
agreement is concluded only the ter ms and conditions of the respective
agreement shall apply. NXP Semiconductors hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
No offer to sell or license — Nothing i n this document may be interpreted or
construed as an of fer t o sell product s that is open for accept ance or t he 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 regulatio ns. Export might require a prior
authorization from competent authorities.
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contains data from the obj ective specification for product development.
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specification.
Product [short] dat a sheet Production This document contains the product specification.
HEF4538B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 8 — 16 November 2011 17 of 18
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
Non-automotive qualified products — Unless this data sheet expressly
states that this specific NXP Semiconductors prod uct is automotive qualified,
the product is not suitable for automotive use. It i s neither qua lified nor test ed
in accordance with automotive testing or application requirements. NXP
Semiconductors 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 automot ive specifications and standard s, customer
(a) shall use the product without NXP Semiconductors’ warranty of the
product for such automotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
NXP Semiconductors’ specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies NXP Semiconductors for any
liability, damages or failed produ ct cl aims resulting from custome r design and
use of the product for automotive applications beyond NXP Semiconductors’
standard warranty and NXP Semiconductors’ product specifications.
15.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respect i ve ow ners.
16. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
NXP Semiconductors HEF4538B
Dual precision monostable multivibrator
© NXP B.V. 2011. All rights reserved.
For more information, please visit: http://www.nxp.co m
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of rele ase: 16 November 2011
Document iden tifier: HEF4538B
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
17. 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 . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 Functional description . . . . . . . . . . . . . . . . . . . 4
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5
8 Recommended operating conditions. . . . . . . . 6
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 6
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 7
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 13
13 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 15
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 15
15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 16
15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 16
15.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
16 Contact information. . . . . . . . . . . . . . . . . . . . . 17
17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18