HCF4538B
DUAL MONOSTABLE MULTIVIBRATOR
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RETRIGGERABLE/RESETTABLE
CAPABILITY
TRIGGER AND RESET PROPAGATION
DELAYS INDEPENDENT OF RX, CX
TRIGGERING FROM LEADING OR
TRAILING EDGE
Q AND Q BUFFERED OUTPUT AVAILABLE
SEPARATE RESETS
WIDE RANGE OF OUTPUT PULSE WIDTHS
QUIESCENT CURRENT SPECIFIED UP TO
20V
5V, 10V AND 15V PARAMETRIC RATINGS
SCHMITT TRIGGER INPUT ALLOWS
UNLIMITED RISE AND FALL TIMES ON +TR
AND -TR INPUTS
INPUT LEAKAGE CURRENT
II = 100nA (MAX) AT VDD = 18V TA = 25°C
100% TESTED FOR QUIESCENT CURRENT
MEETS ALL REQUIREMENTS OF JEDEC
JESD13B " STANDARD SPECIFICATIONS
FOR DESCRIPTION OF B SERIES CMOS
DEVICES"
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DESCRIPTION
The HCF4538B is a monolithic integrated circuit
fabricated in Metal Oxide Semiconductor
technology available in DIP and SOP packages.
The HCF4538B dual precision monostable
multivibrator provides stable retriggerable/
resettable one-shot operation for any fixed voltage
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DIP
SOP
PACKAGE
TUBE
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DIP
SOP
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ORDER CODES
HCF4538BEY
HCF4538BM1
T&R
HCF4538M013TR
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timing application. An external resistor (RX) and
an external capacitor (CX) control the timing and
accuracy for the circuit. Adjustment of RX and CX
provides a wide range of output pulse widths from
the Q and Q terminals. The time delay from trigger
input to output transition (trigger propagation
delay) and the time delay from reset input to
output transition (reset propagation delay) and the
time delay from reset input to output transition
(reset propagation delay) are independent of RX
and CX. Precision control of output pulse width is
achieved through linear CMOS techniques.
Leading edge triggering (+TR) and trailing edge
triggering (-TR) inputs are provided for triggering
PIN CONNECTION
September 2001
1/10
HCF4538B
from either edge of an input pulse. An unused +TR
input should be tied to VSS. An unused -TR input
should be tied to VDD . A RESET (on low level) is
provided for immediate termination of the output
pulse or to prevent output pulses when power is
turned on. An unused RESET input should be tied
to VDD . However, if an entire section of the
HCF4538B is not used, its inputs must be tied to
either VDD or VSS (see table 1). In normal
operation the circuit triggers (extends the output
IINPUT EQUIVALENT CIRCUIT
pulse one period) on the application of each new
trigger pulse. For operation in the non-retiggerable
mode, Q is connected to -TR when leading edge
triggering (+TR) is used or Q is connected to +TR
when trailing edge triggering (-TR) is used. The
time period (T) for this multivibrator can be
calculated by : T = RX CX. The min. value of
external resistance, RX, is 4KΩ. The max. and
min. values of external capacitance, CX, are 100
µF and 5nF, respectively.
PIN DESCRIPTION
PIN No
SYMBOL
4, 12
+TR
5, 11
-TR
RESET
1, 15
CX1, CX2
2, 14
RXCX1
RXCX2
External Resistor/Capacitor Connections
6, 10
Q1, Q2
7, 9
Q1, Q2
Pulse Outputs
Complementary Pulse
Outputs
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FUNCTIONAL DIAGRAM
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Trigger Inputs (Low to
High, Edge-Triggered)
Trigger Inputs (High to
Low, Edge-Triggered)
Direct Reset Inputs
(Active Low)
External Capacitor Connections
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3, 13
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NAME AND FUNCTION
8
VSS
Negative Supply Voltage
16
VDD
Positive Supply Voltage
Terminals 1, 8, 15 are electrically connected internally
HCF4538B
TABLE 1 : Functional Terminal Connections
VDD to Term. N°
FUNCTION
VSS to Term. N°
Input Pulse to
Term. N°
Other Connections
Mono (1) Mono (2) Mono (1) Mono (2) Mono (1) Mono (2) Mono (1) Mono (2)
Leading Edge Trigger/
Retriggerable
Leading Edge Trigger/Non
Retriggerable
Trailing Edge Trigger/
Retriggerable
Trailing Edge Trigger/Non
Retriggerable
3, 5
11, 13
4
12
3
13
4
12
3
13
5
11
3
13
5
11
4
12
5, 7
11, 9
4, 6
12, 10
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A Retriggerable one-shot multivibrator has an output pulse width which is extended on full time period (T) after application of the last trigger
pulse.
A Non-Retriggerable one-shot multivibrator has a time period (T) referenced from the application of the firs trigger pulse.
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HCF4538B
LOGIC DIAGRAM
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ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
ct
Supply Voltage
VI
DC Input Voltage
II
DC Input Current
PD
)
(s
Parameter
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Top
Power Dissipation per Package
Power Dissipation per Output Transistor
Operating Temperature
Tstg
Storage Temperature
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Value
Unit
-0.5 to +22
V
-0.5 to VDD + 0.5
V
± 10
mA
200
100
mW
mW
-55 to +125
°C
-65 to +150
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
All voltage values are referred to VSS pin voltage.
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RECOMMENDED OPERATING CONDITIONS
Symbol
VDD
4/10
Parameter
Supply Voltage
VI
Input Voltage
Top
Operating Temperature
Value
Unit
3 to 20
V
0 to VDD
V
-55 to 125
°C
HCF4538B
DC SPECIFICATIONS
Test Condition
Symbol
IL
Parameter
Quiescent Current
0/5
0/10
0/15
0/20
0/5
0/10
0/15
5/0
10/0
15/0
High Level Output
Voltage
VOH
Low Level Output
Voltage
VOL
High Level Input
Voltage
VIH
Low Level Input
Voltage
VIL
Output Drive
Current
IOH
Output Sink
Current
IOL
Input Leakage
Current
Input Capacitance
II
CI
VO
(V)
VI
(V)
0/5
0/5
0/10
0/15
0/5
0/10
0/15
0.5/4.5
1/9
1.5/13.5
4.5/0.5
9/1
13.5/1.5
2.5
4.6
9.5
13.5
0.4
0.5
1.5
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|IO| VDD
(µA) (V)
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
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Value
Any Input
Any Input
5
10
15
20
5
10
15
5
10
15
5
10
15
5
10
15
5
5
10
15
5
10
15
TA = 25°C
Min.
Max.
0.04
0.04
0.04
0.08
5
10
20
100
4.95
9.95
14.95
-55 to 125°C
Min.
Min.
Max.
150
300
600
3000
4.95
9.95
14.95
3.5
7
11
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-1.6
-0.51
-1.3
-3.4
-0.51
-1.3
-3.4
150
300
600
3000
1.5
3
4
-3.2
-1
-2.6
-6.8
1
2.6
6.8
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±10-5
±0.1
5
7.5
0.05
0.05
0.05
3.5
7
11
1.5
3
4
-1.3
-0.42
-1.1
-2.8
-0.42
-1.1
-2.8
µA
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0.05
0.05
0.05
3.5
7
11
Unit
Max.
4.95
9.95
14.95
0.05
0.05
0.05
-O
18
Typ.
-40 to 85°C
V
V
1.5
3
4
-1.3
-0.42
-1.1
-2.8
-0.42
-1.1
-2.8
±1
V
V
mA
mA
±1
µA
pF
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The Noise Margin for both "1" and "0" level is: 1V min. with VDD =5V, 2V min. with VDD=10V, 2.5V min. with VDD=15V
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HCF4538B
DYNAMIC ELECTRICAL CHARACTERISTICS (Tamb = 25°C, CL = 50pF, RL = 200KΩ, tr = tf = 20 ns)
Test Condition
Symbol
Parameter
VDD (V)
tTLH tTHL Transition Time
tPLH tPHL Propagation Delay Time
+TR or -TR to Q or Q
tPLH tPHL Propagation Delay Time
Reset to Q or Q
tWH tWL
Minimum Input Pulse
Width +TR, -TR or Reset
Output Pulse Width - Q or
Q (CX = 0.005 µF, RX =
tWT
10KΩ (1))
Output Pulse Width - Q or
Q (CX = 0.1µF, RX =
100KΩ)
tWT
Output Pulse Width - Q or
Q (CX = 10µF, RX =
100KΩ)
tWT
Pulse Width Match
Between Circuits in Same
Package : (100(T1 - T2)/T1)
(CX = 0.1µF, RX = 100KΩ)
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Pr
Input Capacitance
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
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Minimum Retrigger Time
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Min.
RL = 1KΩ
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5
10
15
Any Input
Unit
Typ.
Max.
100
50
40
300
150
100
250
125
95
80
40
30
60.6
58.9
59.1
9.97
9.95
10.0
1.0
1.0
1.0
±1
±1
200
100
80
600
300
200
500
250
190
140
80
60
64.5
63.0
63.5
10.5
10.6
10.6
1.06
1.06
1.07
57
55
55
9.4
9.4
9.5
0.95
0.95
0.96
ns
ns
(s)
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RL = 1KΩ
ns
ns
µs
ms
s
%
±1
15
(*) Typical temperature coefficient for all VDD value is 0.3 %/°C.
(1) Minimum RX value = 4KΩ , minimum CX value = 5000 pF
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Value (*)
0
0
0
ns
5
7.5
pF
HCF4538B
TEST CIRCUIT
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CL = 50pF or equivalent (includes jig and probe capacitance)
RL = 200KΩ
RT = ZOUT of pulse generator (typically 50Ω)
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WAVEFORM : PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)
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HCF4538B
Plastic DIP-16 (0.25) MECHANICAL DATA
mm.
inch
DIM.
MIN.
a1
0.51
B
0.77
TYP
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
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20
E
8.5
e
2.54
e3
17.78
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0.335
7.1
I
5.1
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1.27
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3.3
Z
Pr
0.100
F
L
0.787
0.700
0.280
0.201
0.130
0.050
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P001C
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HCF4538B
SO-16 MECHANICAL DATA
mm.
DIM.
MIN.
TYP
A
inch
MAX.
MIN.
TYP.
a1
1.75
MAX.
0.1
0.068
0.2
a2
0.003
0.007
1.65
0.064
b
0.35
0.46
0.013
b1
0.19
0.25
0.007
C
0.5
0.018
)
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0.010
0.019
c1
45° (typ.)
D
9.8
10
0.385
E
5.8
6.2
0.228
e
1.27
e3
8.89
F
3.8
4.0
4.6
5.3
L
0.5
)
(s
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1.27
S
Pr
0.393
0.244
0.050
G
M
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0.62
0.350
0.149
0.157
0.181
0.208
0.019
0.050
0.024
8° (max.)
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PO13H
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HCF4538B
)
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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