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&&
SRZHURQUHVHW
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
© 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 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$LQSXW
Q%LQSXW
Q&'LQSXW
Q5(;7&(;7LQSXW
Q4RXWSXW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 6 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] Ptot derates linearly with 8 mW/K above 70 C.
[3] Ptot derates linearly with 5.5 mW/K above 60 C.
Fig 6. Connection of the external timing components REXT and CEXT
DDN
Q4
Q&'
Q4
Q5(;7&(;7
Q%
Q&(;7
*1' 9
&&
5(;7
&(;7
Q$
7 î5
(;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
© 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 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
© 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 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
© 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 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$LQSXW
*1'
9,
Q&'LQSXW
*1'
92+
Q4RXWSXW
92/
92+
Q4RXWSXW
92/
© Nexperia B.V. 2017. All rights reserved
74HC_HCT4538 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 4 — 24 February 2016 13 of 24
Nexperia 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Fig 8. Waveforms showing nA, nB, nQ, nQ pulse widths, recovery and retrigger times
DDN
Q&'LQSXW
Q$LQSXW
Q%LQSXW
W:WUHF W:
W:
90
9,
90
90
90
W:
WUWULJ
9,
9,
92+
*1'
92/
Q4Q4RXWSXW
*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
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
© 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 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
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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 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
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