MC74HC4538A
Dual Precision Monostable
Multivibrator (Retriggerable,
Resettable)
The MC74HC4538A is identical in pinout to the MC14538B.
The device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LSTTL outputs.
This dual monostable multivibrator may be triggered by either the
positive or the negative edge of an input pulse, and produces
a precision output pulse over a wide range of pulse widths. Because
the device has conditioned trigger inputs, there are no trigger−input
rise and fall time restrictions. The output pulse width is determined by
the external timing components, R
x
and C
x
. The device has a reset
function which forces the Q output low and the Q output high,
regardless of the state of the output pulse circuitry.
Features
http://onsemi.com
SOIC−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
PIN ASSIGNMENT
GND
C
X
1/R
X
1
RESET 1
A1
B1
Q1
Q1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
GND
C
X
2/R
X
2
RESET 2
A2
B2
Q2
Q2
•
Unlimited Rise and Fall Times Allowed on the Trigger Inputs
•
Output Pulse is Independent of the Trigger Pulse Width
•
±
10% Guaranteed Pulse Width Variation from Part to Part
•
•
•
•
•
•
•
•
•
(Using the Same Test Jig)
Output Drive Capability: 10 LSTTL Loads
Outputs Directly Interface to CMOS, NMOS and TTL
Operating Voltage Range: 3.0 to 6.0 V
Low Input Current: 1.0
mA
High Noise Immunity Characteristic of CMOS Devices
In Compliance with the Requirements Defined by JEDEC Standard
No. 7 A
Chip Complexity: 145 FETs or 36 Equivalent Gates
NLV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
These Devices are Pb−Free, Halogen Free and are RoHS Compliant
MARKING DIAGRAMS
16
HC4538AG
AWLYWW
1
SOIC−16
16
HC45
38A
ALYWG
G
1
TSSOP−16
A
L, WL
Y, YY
W, WW
G or
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
©
Semiconductor Components Industries, LLC, 2014
1
August, 2014 − Rev. 15
Publication Order Number:
MC74HC4538A/D
MC74HC4538A
FUNCTION TABLE
Inputs
Reset
H
H
H
H
H
H
L
A
L
X
H
L,H,
L
X
X
L
X
H
L,H,
X
X
Not Triggered
Not Triggered
Not Triggered
Not Triggered
L
H
Not Triggered
B
H
Outputs
Q
Q
C
X
1
R
X
1
V
CC
1
2
6
7
Q1
Q1
PIN 16 = V
CC
PIN 8 = GND
R
X
AND C
X
ARE EXTERNAL COMPONENTS
PIN 1 AND PIN 15 MUST BE HARD WIRED TO GND
TRIGGER
INPUTS
A1
B1
4
5
RESET 1
3
C
X
2
R
X
2
V
CC
15 14
TRIGGER
INPUTS
A2
B2
12
11
10
9
Q2
Q2
RESET 2
13
Figure 1. Logic Diagram
ORDERING INFORMATION
Device
MC74HC4538ADG
MC74HC4538ADR2G
NLV74HC4538ADR2G*
MC74HC4538ADTR2G
NLVHC4538ADTR2G*
Package
SOIC−16
(Pb−Free)
SOIC−16
(Pb−Free)
SOIC−16
(Pb−Free)
TSSOP−16
(Pb−Free)
TSSOP−16
(Pb−Free)
Shipping
†
48 Units / Rail
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NLV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP
Capable
http://onsemi.com
2
MC74HC4538A
MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
T
L
T
J
q
JA
P
D
MSL
F
R
V
ESD
DC Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature Range
Lead temperature, 1 mm from Case for 10 Seconds
Junction temperature under Bias
Thermal resistance
Power Dissipation in Still Air at 85_C
Moisture Sensitivity
Flammability Rating
ESD Withstand Voltage
Oxygen Index: 30% − 35%
Human Body Model (Note 2)
Machine Model (Note 3)
Charged Device Model (Note 4)
Above V
CC
and Below GND at 85_C (Note 5)
SOIC
TSSOP
SOIC
TSSOP
(Note 1)
A, B, Reset
C
X
, R
X
Parameter
Value
−0.5 to +7.0
−0.5
≤
V
I
≤
V
CC
+ 0.5
−0.5
≤
V
O
≤
V
CC
+ 0.5
±20
±30
±25
±25
±100
±100
−65 to +150
260
+150
112
148
500
450
Level 1
UL−94−VO (0.125 in)
> 2000
> 100
> 500
±300
V
Unit
V
V
V
mA
mA
mA
mA
mA
_C
_C
_C
_C/W
mW
I
Latchup
Latchup Performance
mA
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. I
O
absolute maximum rating must be observed.
2. Tested to EIA/JESD22−A114−A.
3. Tested to EIA/JESD22−A115−A.
4. Tested to JESD22−C101−A.
5. Tested to EIA/JESD78.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
in
, V
out
T
A
t
r
, t
f
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
Input Rise and Fall Time
(Figure 6)
A or B (Figure 4)
R
x
C
x
External Timing Resistor
External Timing Capacitor
V
CC
< 4.5 V
V
CC
≥
4.5 V
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
Min
2.0
0
–55
0
0
0
−
1.0
2.0
0
Max
6.0
V
CC
+125
1000
500
400
No Limit
†
†
†
Unit
V
V
_C
ns
kW
mF
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
†The maximum allowable values of R
x
and C
x
are a function of the leakage of capacitor C
x
, the leakage of the HC4538A, and leakage due to board layout
and surface resistance. For most applications, C
x
/R
x
should be limited to a maximum value of 10
mF/1.0
MW. Values of C
x
> 1.0
mF
may cause a
problem during power down (see Power Down Considerations). Susceptibility to externally induced noise signals may occur for R
x
> 1.0 MW.
6. Unused inputs may not be left open. All inputs must be tied to a high−logic voltage level or a low−logic input voltage level.
http://onsemi.com
3
MC74HC4538A
DC CHARACTERISTICS
Guaranteed Limits
V
CC
V
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
1.9
4.4
5.9
3.98
5.48
0.1
0.1
0.1
0.26
0.26
±0.1
–55 to 25_C
Min
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.84
5.34
0.1
0.1
0.1
0.33
0.33
±1.0
Typ
Max
Min
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.7
5.2
0.1
0.1
0.1
0.4
0.4
±1.0
mA
V
≤
85_C
Typ
Max
Min
1.5
3.15
4.2
0.5
1.35
1.8
≤
125_C
Typ
Max
Unit
V
Symbol
V
IH
Parameter
Minimum
High−Level
Input Voltage
Maximum
Low−Level
Input Voltage
Minimum
High−Level
Output Voltage
Test Conditions
V
out
= 0.1 V or V
CC
–
0.1 V
|I
out
|
≤
20
mA
V
out
= 0.1 V or V
CC
–
0.1 V
|I
out
|
≤
20
mA
V
in
= V
IH
or V
IL
|I
out
|
≤
20
mA
V
in
= V
IH
or V
IL
|I
out
|
≤
− 4.0 mA
|I
out
|
≤
− 5.2 mA
V
IL
V
V
OH
V
V
OL
Maximum
Low−Level
Output Voltage
V
in
= V
IH
or V
IL
|I
out
|
≤
20
mA
V
in
= V
IH
or V
IL
|I
out
|
≤
4.0 mA
|I
out
|
≤
5.2 mA
I
in
Maximum Input
Leakage Current
(A, B, Reset)
Maximum Input
Leakage Current
(R
x
, C
x
)
Maximum
Quiescent
Supply Current
(per package)
Standby State
Maximum Supply
Current
(per package)
Active State
V
in
= V
CC
or GND
I
in
V
in
= V
CC
or GND
6.0
±
50
±500
±500
nA
I
CC
V
in
= V
CC
or GND
Q1 and Q2 = Low
I
out
= 0
mA
6.0
130
220
350
mA
I
CC
V
in
= V
CC
or GND
Q1 and Q2 = High
I
out
= 0
mA
Pins 2 and 14 = 0.5
V
CC
25_C
–45_C to 85_C
–55_C to 125_C
mA
6.0
400
600
800
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
http://onsemi.com
4
MC74HC4538A
AC CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6.0 ns)
Guaranteed Limits
V
CC
V
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
−
–55 to 25_C
Min
Max
175
35
30
195
39
33
175
35
30
175
35
30
75
15
13
10
25
≤
85_C
Min
Max
220
44
37
245
49
42
220
44
37
220
44
37
95
19
16
10
25
≤
125_C
Min
Max
265
53
45
295
59
50
265
53
45
265
53
45
110
22
19
10
25
Unit
ns
Symbol
t
PLH
Parameter
Maximum Propagation Delay
Input A or B to Q
(Figures 5 and 7)
Maximum Propagation Delay
Input A or B to NQ
(Figures 5 and 7)
Maximum Propagation Delay
Reset to Q
(Figures 6 and 7)
Maximum Propagation Delay
Reset to NQ
(Figures 6 and 7)
Maximum Output Transition Time, Any Output
(Figures 6 and 7)
Maximum Input Capacitance
(A. B, Reset)
(C
x
, R
x
)
t
PHL
ns
t
PHL
ns
t
PLH
ns
t
TLH,
t
THL
C
in
ns
pF
Typical @ 25°C, V
CC
= 5.0 V
C
PD
Power Dissipation Capacitance (per Multivibrator)*
150
pF
*Used to determine the no−load dynamic power consumption: P
D
= C
PD
V
CC2
f + I
CC
V
CC
.
TIMING CHARACTERISTICS
(Input t
r
= t
f
= 6.0 ns)
Guaranteed Limits
V
CC
V
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
–55 to 25_C
Min
−
−
−
0
0
0
60
12
10
60
12
10
1000
500
400
Max
≤
85_C
Min
−
−
−
0
0
0
75
15
13
75
15
13
1000
500
400
No Limit
0
0
0
90
18
15
90
18
15
1000
500
400
Max
≤
125_C
Min
Max
Unit
ns
Symbol
t
rr
Parameter
Minimum Retrigger Time, Input A or B
(Figure 6) (Note 7)
Minimum Recovery Time, Inactive to A or B
(Figure 6)
Minimum Pulse Width, Input A or B
(Figure 5)
Minimum Pulse Width, Reset
(Figure 6)
Maximum Input Rise and Fall Times, Reset
(Figure 6)
A or B
(Figure 6)
t
rec
ns
t
w
ns
t
w
ns
t
r
, t
f
ns
7.
t
rr
(ns)
+
V
CC
(volts) C
x
(pF)
30.5
http://onsemi.com
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
