1. General description
The 74HC4538; 74HCT4538 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 ed g es of the input pu l se. The du ra tio n an d ac cu ra cy of th e ou tp ut pulse are
determined by the external tim ing component s CEXT a nd REXT. The output pulse width (T)
is equal to 0.7 REXT CEXT. The linear design techniques guarantee precise control of
the output pulse width. A LOW level at nCD terminates the output pulse immediately.
Schmitt-trigger action in the trigger inputs makes the circuit highly tolerant to slower rise
and fall times. Inputs include clamp diodes. This enables the use of current limiting
resistors to interface inputs to voltages in excess of VCC.
2. Features and benefits
Tolerant of slow trigger rise and fall times
Separate reset inputs
Triggering from falling or rising edge
Complies with JEDEC standard no. 7A
Input levels:
For 74HC4538: CMOS leve l
For 74HCT4538: TTL level
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from 40 Cto+85C and from 40 Cto+125C
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Rev. 4 — 24 February 2016 Product data sheet
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 2 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
3. Ordering information
4. Functional diagram
Table 1. Ordering information
Type number Package
Te mperature range Name Description Version
74HC4538D 40 C to +125 C SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
74HCT4538D
74HC4538DB 40 C to +125 C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm SOT338-1
74HCT4538DB
74HC4538PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm SOT403-1
74HCT4538PW
Fig 1. Functional di agram
DDH
$
&(;7
5(;7&(;7
4
4
%
&'
$
&(;7
5(;7&(;7
4
4
%
&'
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 3 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Fig 2. Logic diagram (one multi vibra tor)
PED
9UHI
9UHI
*1'
Q&(;7
Q5(;7&(;7
HQDEOH
HQDEOH
9&&
SRZHURQUHVHW
9&&
Q&'
Q%
Q$
Q4
Q4
*1'
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 4 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
5. Pinning information
5.1 Pinning
5.2 Pin description
Fig 3. Pin configuration for SO16 Fig 4. Pin configuration for SSOP16 and TSSOP16
+&
+&7
&(;7 9&&
5(;7&(;7 &(;7
&' 5(;7&(;7
% &'
$ %
4 $
4 4
*1' 4
DDN
+&
+&7
&(;7 9&&
5(;7&(;7 &(;7
&' 5(;7&(;7
% &'
$ %
4 $
4 4
*1' 4
DDN
Table 2. Pin description
Symbol Pin Description
1CEXT, 2CEXT 1, 15 external capacitor connection (always connected to ground)
1REXT/CEXT, 2REXT/C EXT 2, 14 external capacitor/resistor connection
1CD, 2CD 3, 13 direct reset in pu t (a cti ve 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
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 5 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
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 pule width determined by CEXT and REXT;
= one LOW level output pulse, with the pulse width determined by CEXT and REXT.
Table 3. Function table
Inputs Outputs
nA nB nCD nQ nQ
LH
HH
XXLLH
(1) Positive edge triggering.
(2) Positive edge re-triggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) T = 0.7 REXT CEXT (see also Figure 6).
Fig 5. Timing diagram
DDH
9UHI
7
9UHI 9UHI
9UHI
77
Q$LQSXW
Q%LQSXW
Q&'LQSXW
Q5(;7&(;7LQSXW
Q4RXWSXW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 6 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] Ptot derates linearly with 8 mW/K above 70 C.
[3] Ptot derates linearly with 5.5 mW/K above 60 C.
Fig 6. Connection of the external timing components REXT and CEXT
DDN
Q4
Q&'
Q4
Q5(;7&(;7
Q%
Q&(;7
*1' 9
&&
5(;7
&(;7
Q$
7 î5
(;7
î&
(;7
7
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
VCC supply voltage 0.5 +7.0 V
IIK input clamping current VI < 0.5 V or VI>V
CC +0.5 V [1] -20 mA
IOK output clamping current VO < 0.5 V or VO > VCC + 0.5 V [1] -20 mA
IOoutput current VO = 0.5 V to VCC +0.5V - 25 mA
ICC supply current - +50 mA
IGND ground current 50 - mA
Tstg storage temperature 65 +150 C
Ptot total power dissipation Tamb = 40 C to +125 C
SO16 package [2] - 500 mW
(T)SSOP16 package [3] - 500 mW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 7 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
8. Recommended operating conditions
9. Static characteristics
Table 5. Recommended operating con ditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter Conditions 74HC4538 74HCT4538 Unit
Min Typ Max Min Typ Max
VCC supply voltage 2.0 5.0 6.0 4.5 5.0 5.5 V
VIinput voltage 0 - VCC 0-V
CC V
VOoutput voltage 0 - VCC 0-V
CC V
Tamb ambient temperature 40 - +125 40 - +125 C
t/V input transition rise and fall rate VCC = 2.0 V - - 625 - - - ns/V
VCC = 4.5 V - 1.67 139 - 1.67 139 ns/V
VCC = 6.0 V - - 83 - - - ns/V
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 C40 C to +85 C40 C to +125 CUnit
Min Typ Max Min Max Min Max
74HC4538
VIH HIGH-level
input voltage 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
VIL LOW-level
input voltage VCC = 2.0 V - 0.8 0.5 - 0.5 - 0.5 V
VCC = 4.5 V - 2.1 1.35 - 1.35 - 1.3 5 V
VCC = 6.0 V - 2.8 1.8 - 1.8 - 1.8 V
VOH HIGH-level
output voltage VI = VIH or VIL
IO = 20 A; VCC = 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
IO = 20 A; VCC = 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
IO = 20 A; 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
VOL LOW-level
output voltage VI = VIH or VIL
IO = 20 A; VCC = 2.0 V - 0 0.1 - 0.1 - 0.1 V
IO = 20 A; VCC = 4.5 V - 0 0.1 - 0.1 - 0.1 V
IO = 20 A; 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
IIinput leakage
current VI = VCC or GND;
VCC =6.0V --0.1 - 1-1A
pin nREXT/CEXT;
VI= 2.0 V or GND; other
inputs at VCC or GND;
VCC =6.0V
[1]
--0.5 - 5-10 A
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 8 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
[1] This measurement can only be carried out after a trigger pulse is applied.
ICC supply current VI = VCC or GND; IO=0A;
VCC =6.0V - - 8.0 - 80 - 160 A
CIinput
capacitance -3.5- - - - -pF
74HCT4538
VIH HIGH-level
input voltage VCC = 4.5 V to 5.5 V 2.0 1.6 - 2.0 - 2.0 - V
VIL LOW-level
input voltage VCC = 4.5 V to 5.5 V - 1.2 0.8 - 0.8 - 0.8 V
VOH HIGH-level
output voltage VI = VIH or VIL; VCC = 4.5 V
IO = 20 A 4.4 4.5 - 4.4 - 4.4 - V
IO = 4.0 mA 3.98 4.32 - 3.84 - 3.7 - V
VOL LOW-level
output voltage VI = VIH or VIL; VCC = 4.5 V
IO = 20 A; VCC = 4.5 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
IIinput leakage
current VI = VCC or GND;
VCC =5.5V --0.1 - 1-1A
pin nREXT/CEXT;
VI= 2.0 V or GND; other
inputs at VCC or GND;
VCC =5.5V
[1]
--0.5 - 5-10 A
ICC supply current VI = VCC or GND; IO=0A;
VCC =5.5V - - 8.0 - 80 - 160 A
ICC additional
supply current VI=V
CC 2.1 V; IO=0A;
other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V
pin nA, nB - 50 180 - 225 - 245 A
pin nCD - 65 234 - 293 - 319 A
CIinput
capacitance -3.5- - - - -pF
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 C40 C to +85 C40 C to +125 CUnit
Min Typ Max Min Max Min Max
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 9 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter Conditions 25 C40 C to
+85 C40 C to
+125 CUnit
Min Typ[1] Max Min Max Min Max
74HC4538
tPLH LOW to HIGH
propagation
delay
nA, nB to nQ;
see Figure 7
VCC = 2.0 V - 85 26 5 - 330 - 400 ns
VCC = 4.5 V - 31 53 - 66 - 80 ns
VCC = 5.0 V; CL=15pF -27-----ns
VCC = 6.0 V - 25 45 - 56 - 68 ns
nCD to nQ; see Figure 7
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
tPHL HIGH to LOW
propagation
delay
nA, nB to nQ;
see Figure 7
VCC = 2.0 V - 83 265 - 330 - 400 ns
VCC = 4.5 V - 30 53 - 66 - 80 ns
VCC = 5.0 V; CL=15pF -27-----ns
VCC = 6.0 V - 24 45 - 56 - 68 ns
nCD to nQ; see Figure 7
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
tttransition time nQ and nQ; see Figure 7 [2]
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
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 10 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
tWpulse width nA LOW; see Figure 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
nB HIGH; see Figure 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
nCD LOW; see Figure 8
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
nQ and nQ HIGH or LOW;
see Figure 8
VCC = 5.0 V;
CEXT =0.1F;
REXT =10 k
630 700 770 602 798 595 805 s
trec recovery time nCD to nA, nB;
see Figure 8
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
trtrig retrigger time nA, nB; see Figure 8;
X=C
EXT / (4.5 VCC)
VCC = 2.0 V -455+X-----ns
VCC = 4.5 V -80+X-----ns
VCC = 6.0 V -55+X-----ns
REXT external timing
resistor VCC = 2.0 V 10-1000----k
VCC = 5.0 V 2 -1000----k
CEXT external timing
capacitor no limits
CPD power
dissipation
capacitance
per multivibrator;
VI=GNDtoV
CC
[3] -136-----pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter Conditions 25 C40 C to
+85 C40 C to
+125 CUnit
Min Typ[1] Max Min Max Min Max
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 11 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
74HCT4538
tPLH LOW to HIGH
propagation
delay
nA, nB to nQ;
see Figure 7
VCC = 4.5 V - 35 60 - 75 - 90 ns
VCC = 5.0 V; CL=15pF -30-----ns
nCD to nQ; see Figure 7
VCC = 4.5 V - 35 60 - 75 - 90 ns
tPHL HIGH to LOW
propagation
delay
nA, nB to nQ;
see Figure 7
VCC = 4.5 V - 35 60 - 75 - 90 ns
VCC = 5.0 V; CL=15pF -30-----ns
nCD to nQ; see Figure 7
VCC = 4.5 V - 35 60 - 75 - 90 ns
tttransition time nQ and nQ; see Figure 7 [2]
VCC = 4.5 V - 7 15 - 19 - 21 ns
tWpulse width nA LOW; see Figure 8
VCC = 4.5 V 20 11 - 25 - 30 - ns
nB HIGH; see Figure 8
VCC = 4.5 V 16 5 - 20 - 24 - ns
nCD LOW; see Figure 8
VCC = 4.5 V 20 11 - 25 - 30 - ns
nQ and nQ HIGH or LOW;
see Figure 8
VCC = 5.0 V;
CEXT =0.1F;
REXT =10 k
630 700 770 602 798 595 805 s
trec recovery time nCD to nA, nB;
see Figure 8
VCC = 4.5 V 7 2 - 9 - 11 - ns
trtrig retrigger time nA, nB; see Figure 8;
X=C
EXT / (4.5 VCC)
VCC = 4.5 V -80+X-----ns
REXT external timing
resistor VCC = 5.0 V 2 -1000----k
CEXT external timing
capacitor VCC = 5.0 V no limits
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter Conditions 25 C40 C to
+85 C40 C to
+125 CUnit
Min Typ[1] Max Min Max Min Max
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 12 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC =5.0V).
[2] tt is the same as tTHL and tTLH.
[3] CPD is used to determine the dynamic power dissipation (PD in W).
PD=C
PD VCC2fi+(CLVCC2fo) + 0.48 CEXT VCC2 fo + D 0.8 VCC where:
fi= input frequency in MHz;
fo= output frequency in MHz;
(CLVCC2fo) = 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.
11. Waveforms
CPD power
dissipation
capacitance
per multivibrator;
VI=GNDtoV
CC 1.5 V [3] -138-----pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter Conditions 25 C40 C to
+85 C40 C to
+125 CUnit
Min Typ[1] Max Min Max Min Max
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 de lays and transition times
DDN
9,
90
9;
9<
9<
9;
W3/+ W3/+
W3+/ W7+/ W7/+ W3/+
W3+/
W3+/
9090
90
90
90
W:
W:
Q%LQSXW
*1'
9,
Q$LQSXW
*1'
9,
Q&'LQSXW
*1'
92+
Q4RXWSXW
92/
92+
Q4RXWSXW
92/
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 13 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Fig 8. Waveforms showing nA, nB, nQ, nQ pulse widths, recovery and retrigger times
DDN
Q&'LQSXW
Q$LQSXW
Q%LQSXW
W:WUHF W:
W:
90
9,
90
90
90
W:
WUWULJ
9,
9,
92+
*1'
92/
Q4Q4RXWSXW
*1'
*1'
Table 8. Measurement points
Type Input Output
VMVMVXVY
74HC4538 0.5VCC 0.5VCC 0.1VCC 0.9VCC
74HCT45381.3V1.3V0.1V
CC 0.9VCC
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 14 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
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
9
0
9
0
W
:
W
:
9
9
,
9
,
QHJDWLYH
SXOVH
SRVLWLYH
SXOVH
9
9
0
9
0
W
I
W
U
W
U
W
I
DDG
'87
9
&&
9
&&
9,92
57
5/6
&/
RSHQ
*
Table 9. Test data
Type Input Load S1 position
VItr, tfCLRLtPHL, tPLH
74HC4538 VCC 6ns 15pF, 50 pF 1kopen
74HCT4538 3 V 6 ns 15 pF, 50 pF 1 kopen
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74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 15 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
12. Application information
12.1 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 Scho ttky type diode able to withstand
large current surges and connect as shown in Figure 10
12.2 Graphs
Fig 10. Power-down protection circuit
DDN
Q5(;7&(;7Q&(;7
*1' 9
&&
5(;7
'(;7
&(;7
VCC = 4.5 V; Tamb = 25 C.
Fig 11. Ty pical pu lse width accuracy versus external capacitance
DDN
&
(;7
)
QRUPDOL]HG
.IDFWRU
.
5
(;7
î
&
(;7
W
:
Nȍ
Nȍ
Nȍ
Nȍ
0ȍ
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 16 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
VCC = 4.5 V; Tamb = 25 C.
Fig 12. Typical puls e width accuracy versus external resistance
VCC = 4.5 V; REXT = 10 k; Tamb = 25 C.
Fig 13. Typical puls e width accuracy versus external capacitance
CEXT = 1 nF; Tamb = 25 C.
Fig 14. Typical pulse width accuracy versus power supply
5(;7ȍ
DDN
5(;7î
&(;7
W:
QRUPDOL]HG
.IDFWRU
.
!Q)
Q)
DDN
&
(;7
)
QRUPDOL]HG
.IDFWRU
.
5
(;7
î
&
(;7
W
:
5
(;7
9
&&
9
DDN
5
(;7
î
&
(;7
W
:
QRUPDOL]HG
.IDFWRU
. Nȍ
Nȍ Nȍ
Nȍ
0ȍ
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 17 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
CEXT = 100 nF; Tamb = 25 C.
Fig 15. Typical pulse width accuracy versus power supply
VCC = 4.5 V; CEXT = 1 nF; Tamb = 25 C.
Fig 16. Typical puls e width accuracy versus temperature
VCC = 4.5 V; CEXT = 1 F; Tamb = 25 C.
Fig 17. Typical puls e width accuracy versus temperature
9
&&
9
DDN
5
(;7
î
&
(;7
W
:
QRUPDOL]HG
.IDFWRU
.
Nȍ
Nȍ
Nȍ
0ȍ
7
DPE
&
DDN
5
(;7
î
&
(;7
W
:
QRUPDOL]HG
.IDFWRU
.
Nȍ
Nȍ
Nȍ
0ȍ
7
DPE
&
DDN
5
(;7
î
&
(;7
W
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 18 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
13. Package outline
Fig 18. Package outline SOT109-1 (SO16)
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 19 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Fig 19. Package outline SOT338-1 (SSOP16)
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 20 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Fig 20. Package outline SOT403-1 (TSSOP16)
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 21 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
14. Abbreviations
15. Revision history
Table 10. Abbreviation s
Acronym Description
CMOS Complementary Metal-Oxide Semiconductor
DUT Device Under Test
ESD ElectroStatic Discharge
HBM Human Body Model
MM Machine Model
TTL Transistor-Transistor Logic
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
74HC_HCT4538 v.4 201 60224 Product data sheet - 74HC_HCT4538 v.3
Modifications: •Type numbers 74HC4538N and 74HCT4538N (SOT38-4) removed.
74HC_HCT4538 v.3 20090608 Product data sheet - 74HC_HCT4538_CNV v.2
Modifications: •The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
•Legal texts have been adapted to the new company name where appropriate .
•Pin names changed throughout.
•Section Section 7, Section 8 and Section 9 added, taken from the 74HC/T HCMOS Family
characteristics/specification (March 1988).
•Test circuit added: Figure 9.
•Quick reference data incorporated in to Section 9 and Section 10.
•Package information added for DIP16, SO16, SSOP16 and TSSOP16 packages.
74HC_HCT4538_CNV v .2 19970902 Product specification - -
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 22 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
16. Legal information
16.1 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 document m ay have cha nged since thi s document w as publish ed and may di ffe r in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nexperia.com.
16.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no 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 b e relied 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 Nexperia sales
office. In case of any inconsistency or conflict wit h the short data sheet, the
full data sheet shall pre va il.
Product specificat io n — The information and data provided in a Product
data sheet shall define the specification of the product as agr eed 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 off er functions and qualities beyond those described in the
Product data sheet.
16.3 Disclaimers
Limited warr a nty and liability — Information in this document is believed to
be accurate and reliable. However, Nexperia does not give any
representations or warrant ies, 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 consequ ential damages (including - wit hout 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 informa tion 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, lif e-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of a Nexperia product can reasonably be expected
to result in perso nal 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 ther efore such inclu sion and/or use is at the cu stomer’s own
risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. Nexperia makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using Nexperia products, and Nexperia
accepts no liability for any assistance with applicati ons 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 fo r the planned application and use of
customer’s third party customer(s). Custo mers 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 custo mer(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 individua l 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 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 the gr ant,
conveyance or implication of any license under any copyrights, patents or
other industrial or inte llectual property rights.
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contains data fro m the objective specification for product development.
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specification.
Product [short] data sheet Production This document contains the product specification.
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 23 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
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 qua lified 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 au tomotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automot ive specifications and standards, custome r
(a) shall use the product without Nexperia’s warranty of the
product for such au tomotive applications, use and specificatio ns, 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 f rom customer design an d
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 docume nt is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
16.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respective ow ners.
17. Contact information
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
18. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
4 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 Functional description . . . . . . . . . . . . . . . . . . . 5
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
8 Recommended operating conditions. . . . . . . . 7
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 7
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 9
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
12 Application information. . . . . . . . . . . . . . . . . . 15
12.1 Power-down considerations . . . . . . . . . . . . . . 15
12.2 Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
13 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 18
14 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 21
15 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 21
16 Legal information. . . . . . . . . . . . . . . . . . . . . . . 22
16.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 22
16.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
16.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
16.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 23
17 Contact information. . . . . . . . . . . . . . . . . . . . . 23
18 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
© Nexperia B.V. 2017. All rights reserved
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release:
24 February 2016
