1. General description
The 74HC4538-Q100; 74HCT4538-Q100 are high-speed Si-gate CMOS devices and are
pin compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance
with JEDEC standard no. 7A.
The 74HC4538-Q100; 74HCT4538-Q100 are dual retriggerable-resettable monostable
multivibrators. 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)
•two pins (nREXT/CEXT and nCEXT) for connecting the external timing components
CEXT and REXT
Typical pulse width variation over the specified temp 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. 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
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 immed iately. Schmitt trigger
action on pins nA and nB makes the circuit highly tolerant of slower rise and fall times.
This product has been qualified to the Automotive Electronics Council (AEC) standard
Q100 (Grade 1) and is suitable for use in automotive applications.
2. Features and benefits
Automotive product qualification in accordance with AEC-Q100 (Grade 1)
Specified from 40 C to +85 C and from 40 C to +125 C
Tolerant of slow trigger rise and fall times
Separate reset inputs
Triggering from falling or rising edge
ESD protection:
MIL-STD-883, method 3015 exceeds 2000 V
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V (C = 200 pF, R = 0 )
Multiple package options
74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
Rev. 1 — 2 August 2012 Product data sheet
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 2 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
3. Ordering information
4. Functional diagram
Table 1. Ordering information
Type number Package
Temperature range Name Description Version
74HC4538D-Q100 40 C to +125 C SO16 plastic small outline package; 16 leads; body width
3.9 mm SOT109-1
74HCT4538D-Q100
74HC4538PW-Q100 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm SOT403-1
74HCT4538PW-Q100
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
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 3 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
Fig 2. Logic diagram (one multi vi brator)
mba338
Vref2
Vref1
GND
nCEXT
nREXT/CEXT
enable
enable
VCC
power-on reset
VCC
nCD
nB
nA
nQ
nQ
GND
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 4 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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 TSSOP16
+&4
+&74
&(;7 9
&&
5(;7&(;7
&(;7
&'
5(;7&(;7
% &'
$ %
4 $
4 4
*1' 4
DDD







+&4
+&74
&(;7 9&&
5(;7&(;7
&(;7
&'
5(;7&(;7
% &'
$ %
4 $
4 4
*1' 4
DDD







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 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
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 5 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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 retriggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) T = 0.7 REXT CEXT (see also Figure 6).
Fig 5. 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
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 6 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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
001aak192
nQ
nCD
nQ
nREXT/CEXT
nB
nCEXT
GND VCC
REXT
CEXT
nA
T = 0.7 × REXT × CEXT
T
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 curre nt 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
TSSOP16 package [3] - 500 mW
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 7 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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-Q100 74HCT4538-Q100 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 - - 62 5 - - - 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-Q100
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 - 1.35 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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Product data sheet Rev. 1 — 2 August 2012 8 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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-Q100
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
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 9 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
10. Dynamic characteristics
Table 7. Dynamic characteristics
Vo ltages 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-Q100
tPLH LOW to HIGH
propagation
delay
nA, nB to nQ;
see Figure 7
VCC = 2.0 V - 85 265 - 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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Product data sheet Rev. 1 — 2 August 2012 10 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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
resistance VCC = 2.0 V 10-1000----k
VCC = 5.0 V 2 -1000----k
CEXT external
capacitance no limits
CPD power
dissipation
capacitance
per multivibrator;
VI=GNDtoV
CC
[3] -136-----pF
Table 7. Dynamic characteristics …continued
Vo ltages 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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Product data sheet Rev. 1 — 2 August 2012 11 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
74HCT4538-Q100
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
resistance VCC = 5.0 V 2 -1000----k
CEXT external
capacitance VCC = 5.0 V no limits
Table 7. Dynamic characteristics …continu ed
Vo ltages 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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Product data sheet Rev. 1 — 2 August 2012 12 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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=GNDto(V
CC 1.5 V) [3] -138-----pF
Table 7. Dynamic characteristics …continued
Vo ltages 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 pr opagation de lays and transition times
001aak194
VIVM
VX
VY
VY
VX
tPLH tPLH
tPHL tTHL tTLH tPLH
tPHL
tPHL
VMVM
VM
VM
VM
tW
tW
nB input
GND
VI
nA input
GND
VI
nCD input
GND
VOH
nQ output
VOL
VOH
nQ output
VOL
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Product data sheet Rev. 1 — 2 August 2012 13 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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
Table 8. Measurement points
Type Input Output
VMVMVXVY
74HC4538-Q100 0.5VCC 0.5VCC 0.1VCC 0.9VCC
74HCT4538-Q100 1.3 V 1.3 V 0.1VCC 0.9VCC
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Product data sheet Rev. 1 — 2 August 2012 14 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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
V
M
V
M
t
W
t
W
10 %
90 %
0 V
V
I
V
I
negative
pulse
positive
pulse
0 V
V
M
V
M
90 %
10 %
t
f
t
r
t
r
t
f
001aad983
DUT
V
CC
V
CC
VIVO
RT
RLS1
CL
open
G
Table 9. Test data
Type Input Load S1 position
VItr, tfCLRLtPHL, tPLH
74HC4538-Q100 VCC 6ns 15pF, 50 pF 1kopen
74HCT4538-Q100 3 V 6 ns 15 pF, 50 pF 1 kopen
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 15 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
12. Application information
12.1 Power-down considerations
A large capacitor (CEXT) may cause problems when powering-down the monost able 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 Schottky type diode able to withstand
large current surges and connect as shown in Figure 10
12.2 Graphs
Fig 10. Power-down protection circuit
001aak193
nREXT/CEXTnCEXT
GND VCC
REXT
DEXT
CEXT
VCC = 4.5 V; Tamb = 25 C.
Fig 11. Typical pulse width accuracy versus external capacitance
001aak196
C
EXT
(F)
10
−10
10
−5
10
−4
10
−6
10
−7
10
−9
10
−8
1.0
1.2
0.8
1.6
0.6
normalized
K factor
(K)
0.70
0.84
0.56
1.12
0.42
R
EXT
×
C
EXT
(t
W
)
1 kΩ
2 kΩ
5.6 kΩ
51 kΩ
1 MΩ
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Product data sheet Rev. 1 — 2 August 2012 16 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
VCC = 4.5 V; Tamb = 25 C.
Fig 12. Typical pulse width accuracy versus external resistance
R
EXT
(Ω)
10
3
10
6
10
5
10
4
001aak197
1.0
1.2
0.8
1.6
0.6
0.70
0.84
0.56
1.12
0.42
R
EXT
×
C
EXT
(t
W
)
normalized
K factor
(K)
> 100 nF
1 nF
VCC = 4.5 V; REXT = 10 k; Tamb = 25 C.
Fig 13. Typical pulse width accuracy versus external capacitan ce
001aak198
C
EXT
(F)
10
−10
10
−5
10
−4
10
−6
10
−7
10
−9
10
−8
1.0
1.2
0.8
1.6
0.6
normalized
K factor
(K)
0.70
0.84
0.56
1.12
0.42
R
EXT
×
C
EXT
(t
W
)
R
EXT
+10 %
−10 %
CEXT = 1 nF; Tamb = 25 C.
Fig 14. Typical pulse width accuracy versus power supply
V
CC
(V)
156423
001aak199
0.77
0.91
0.63
1.19
0.49
R
EXT
×
C
EXT
(t
W
)
1.1
1.3
0.9
1.7
0.7
normalized
K factor
(K) 5.6 kΩ
2 kΩ1 kΩ
10 kΩ
1 MΩ
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 17 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
CEXT = 100 nF; Tamb = 25 C.
Fig 15. Typical pulse width accuracy versus power supply
V
CC
(V)
156423
001aak200
0.77
0.91
0.63
1.19
0.49
R
EXT
×
C
EXT
(t
W
)
1.1
1.3
0.9
1.7
0.7
normalized
K factor
(K)
5.6 kΩ
2 kΩ
1 kΩ
1 MΩ
VCC = 4.5 V; CEXT = 1 nF; Tamb = 25 C.
Fig 16. Typical pulse width accuracy versus temper ature
Tamb (°C)
−50 100 150500
001aak201
0.77
0.91
0.63
1.19
0.49
REXT ×
CEXT
(tW)
1.1
1.3
0.9
1.7
0.7
normalized
K factor
(K)
5.6 kΩ
2 kΩ
1 kΩ
1 MΩ
VCC = 4.5 V; CEXT = 1 F; Tamb = 25 C.
Fig 17. Typical pulse width accuracy versus temper ature
T
amb
(°C)
−50 100 150500
001aak202
0.77
0.91
0.63
1.19
0.49
R
EXT
×
C
EXT
(t
W
)
1.1
1.3
0.9
1.7
0.7
normalized
K factor
(K)
1 kΩ
2 kΩ
5.6 kΩ
1 MΩ
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 18 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
13. Package outline
Fig 18. 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
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 19 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
Fig 19. Package outline SOT403-1 (TSSOP16)
UNIT A1A2A3bpcD
(1) E(2) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.15
0.05 0.95
0.80 0.30
0.19 0.2
0.1 5.1
4.9 4.5
4.3 0.65 6.6
6.2 0.4
0.3 0.40
0.06 8
0
o
o
0.13 0.10.21
DIMENSIONS (mm are the original dimensions)
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
0.75
0.50
SOT403-1 MO-153 99-12-27
03-02-18
wM
bp
D
Z
e
0.25
18
16 9
θ
A
A1
A2
Lp
Q
detail X
L
(A )
3
HE
E
c
vMA
X
A
y
0 2.5 5 mm
scale
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1
A
max.
1.1
pin 1 index
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 20 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
14. Abbreviations
15. Revision history
Table 10. Abbreviations
Acronym Description
CMOS Complementary Metal-Oxide Semiconductor
DUT Device Under Test
ESD ElectroStatic Discharge
HBM Human Body Model
LSTTL Low-power Schottky Transistor-Transistor Logic
MM Machine Model
TTL Transistor-Transistor Logic
MIL Military
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
74HC_HCT4538_Q100 v.1 20120802 Product data sheet - 74HC_HCT4538_CNV_2
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 21 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
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 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.
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. NXP Semiconductors does not give any
representations or warranties as to the accuracy or comple teness 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 conf lict with the short data sheet, the
full data sheet shall pre vail.
Product specification — 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 beyon d 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, 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. NXP Se miconductors takes no
responsibility for the content in this document if provided by an inf ormation
source outside of NXP Semiconductors.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
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 Semiconductors’ ag gregate and cumulative l iability 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 descripti ons, at any time and without
notice. This document supersedes and replaces all informa tion supplied prior
to the publication hereof .
Suitability for use in automotive applications — T his NXP
Semiconductors product has been qualified for use in automotive
applications. Unless ot herwise agreed in writing, t he product is 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 NXP Semiconductors product can reasonably be expected
to result in perso nal injury, death or severe property or environmental
damage. NXP Semiconductors and its suppliers accept no liability for
inclusion and/or use of NXP Semiconducto rs products in such equipment or
applications an d ther efo re su ch inclusi on a nd/or use is at the cu stome r's own
risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors 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 liabil ity 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 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 rating s 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 exp r essly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
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] dat a sheet Qualification This document contains data from the preliminary specificat ion.
Product [short] dat a sheet Production This document contains the product specification.
74HC_HCT4538_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 2 August 2012 22 of 23
NXP Semiconductors 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
No offer to sell or license — Nothing in this document may be interpret ed or
construed as an of fer to sell product s that is op en for accept ance 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.
Translations — A non-English (translated) version of a document is for
reference only. The Englis h 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 respect i ve ow ners.
17. 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 74HC4538-Q100; 74HCT4538-Q100
Dual retriggerable precision monostable multivibrator
© NXP B.V. 2012. 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 release: 2 August 2012
Document identifier: 74HC_HCT4538_Q100
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
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. . . . . . . . . . . . . . . . . . . . . . . . . . 20
15 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 20
16 Legal information. . . . . . . . . . . . . . . . . . . . . . . 21
16.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 21
16.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
16.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
16.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
17 Contact information. . . . . . . . . . . . . . . . . . . . . 22
18 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23