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INTEGRATED CIRCUITS
DATA SH EET
For a complete data sheet, please also download:
•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC
•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC
HEF4538B
MSI
Dual precision monostable
multivibrator
Product specification
File under Integrated Circuits, IC04
January 1995
Page 2
Philips Semiconductors Product specification
Dual precision monostable multivibrator
DESCRIPTION
The HEF4538B is a dual retriggerable-resettable
monostable multivibrator. Each multivibrator has an active
LOW trigger/retrigger input (I0), an active HIGH
trigger/retrigger input (I1), an overriding active LOW direct
reset input (CD), an output (O) and its complement (O),
and two pins (CTC,
timing components Ctand Rt. Typical pulse width variation
over temperature range is ± 0,2%.
The HEF4538B may be triggered by either the positive or
the negative edges of the input pulse and will produce an
(1)
RCTC) for connecting the external
HEF4538B
MSI
accurate output pulse with a pulse width range of 10 µs to
infinity. The duration and accuracy of the output pulse are
determined by the external timing components C
The output pulse width (T) is equal to Rt× Ct. The linear
design techniques in LOCMOS guarantee precise control
of the output pulse width.
A LOW level at CDterminates the output pulse
immediately. Schmitt-trigger action in the trigger inputs
makes the circuit highly tolerant to slower rise and fall
times.
and Rt.
t
Fig.2 Pinning diagram.
HEF4538BP(N): 16-lead DIL; plastic (SOT38-1)
HEF4538BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)
HEF4538BT(D): 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
PINNING
I
0A,I0B
, I
I
1A
1B
CDA, C
, O
O
A
OA, O
C
TC A
RC
TC A
B
B
, C
DB
TC B
, RC
input (HIGH to LOW triggered)
input (LOW to HIGH triggered)
direct reset input (active LOW)
output
complementary output (active LOW)
external capacitor connections
external capacitor/ resistor
TC B
(1)
connections
Note
1. Always connected to ground.
Fig.1 Functional diagram.
January 1995 2
FAMILY DATA, I
LIMITS category MSI
DD
See Family specifications.
Page 3
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January 1995 3
Philips Semiconductors Product specification
Dual precision monostable multivibrator
Fig.3 Logic diagram.
HEF4538B
MSI
Page 4
Philips Semiconductors Product specification
Dual precision monostable multivibrator
FUNCTION TABLE
INPUTS OUTPUTS
I
0
HH
XXLLH
Notes
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
= positive output pulse
= negative output pulse
= positive-going transition
= negative-going transition
I
1
C
D
LH
O O
HEF4538B
MSI
Fig.4 Connection of the external timing
components Rtand Ct.
DC CHARACTERISTICS
V
=0V
SS
T
(°C)
amb
V
DD
V
SYMBOL
− 40 + 25 + 85
TYP. MAX. TYP. MAX. TYP. MAX.
Supply current 5 55 µA
active state 10 I
D
150 µA
(see note) 15 220 µA
Input leakage
current 15 ± I
IN
300 1000 nA
(pins 2 and 14)
Note
1. Only one monostable is switching: current present during output pulse (output O is HIGH).
January 1995 4
Page 5
Philips Semiconductors Product specification
Dual precision monostable multivibrator
HEF4538B
AC CHARACTERISTICS
V
=0V; T
SS
Propagation delays
I0, I1→ O 5 200 460 ns 173 ns + (0,55 ns/pF) C
HIGH to LOW 10 t
I0, I1→ O 5 220 440 ns 193 ns + (0,55 ns/pF) C
LOW to HIGH 10 t
CD→ O 5 125 250 ns 98 ns + (0,55 ns/pF) C
HIGH to LOW 10 t
CD→ O 5 125 250 ns 98 ns + (0,55 ns/pF) C
LOW to HIGH 10 t
Recovery times 5 20 40 ns
CD→ I0,I
Retrigger times 5 0 ns
O,
O → I0,I
Minimum I
pulse width; LOW 10 t
Minimum I
pulse width; HIGH 10 t
Minimum C
pulse width; LOW 10 t
Output O or
pulse width 10 t
Output O or O 5 10,3 10,8 11,3 ms
pulse width 10 t
Output O or O 5 1,01 1,09 1,11 s
pulse width 10 t
=25°C; CL= 50 pF; input transition times ≤ 20 ns
amb
V
DD
V
SYMBOL MIN. TYP. MAX.
PHL
90 180 ns 79 ns + (0,23 ns/pF) C
15 60 120 ns 52 ns + (0,16 ns/pF) C
PLH
85 190 ns 74 ns + (0,23 ns/pF) C
15 60 120 ns 52 ns + (0,16 ns/pF) C
PHL
55 110 ns 44 ns + (0,23 ns/pF) C
15 40 80 ns 32 ns + (0,16 ns/pF) C
PLH
55 110 ns 44 ns + (0,23 ns/pF) C
15 40 80 ns 32 ns + (0,16 ns/pF) C
1
10 t
RCD
10 20 ns
15 5 10 ns
1
10 t
RO
0ns
15 0 ns
0
59045ns
WI0L
30 15 ns
15 24 12 ns
1
55025ns
WI1H
24 12 ns
15 20 10 ns
D
55525ns
WCDL
25 12 ns
15 20 10 ns
O 5 218 230 242 µs
WO
213 224 235 µs
15 211 223 234 µs
WO
10,2 10,7 11,2 ms
15 10,1 10,6 11,1 ms
WO
0,99 1,04 1,09 s
15 0,99 1,04 1,09 s
TYPICAL EXTRAPOLA TION
FORMULA
= 100 kΩ
R
t
Ct= 0,002 µF
= 100 kΩ
R
t
Ct= 0,1 µF
= 100 kΩ
R
t
Ct=10µF
MSI
L
L
L
L
L
L
L
L
L
L
L
L
January 1995 5
Page 6
Philips Semiconductors Product specification
Dual precision monostable multivibrator
HEF4538B
AC CHARACTERISTICS
V
=0V; T
SS
Change in output O 5 ± 0,2 %
pulse width over 10 ∆t
temperature (T
Change in output O
pulse width over ∆t
V
range 5 to 15 V
DD
Pulse width variation 5 ± 1%
between circuits 10 ∆t
in same package 15 ± 1%
External timing
resistor R
External timing
capacitor C
=25°C; CL= 50 pF; input transition times ≤ 20 ns
amb
V
DD
V
)15 ±0,2 %
amb
SYMBOL MIN. TYP. MAX.
WO
WO
WO
t
t
± 0,2 %
± 1,5 %
± 1%
5 −
(1)
kΩ
2000 − no limits pF
R
= 100 kΩ
t
Ct= 2 nF to 10 µF
MSI
Input capacitance
(pin 2 or 14) C
IN
Note
1. The maximum permissible resistance R
, which holds the specified accuracy of tWO, depends on the leakage current
t
of the capacitor Ctand the leakage of the HEF4538B.
15 pF
January 1995 6
Page 7
Philips Semiconductors Product specification
Dual precision monostable multivibrator
HEF4538B
MSI
Fig.5 Waveforms showing minimum I0, I1, O and CDpulse widths, recovery times and propagation delays.
(1) Positive edge triggering.
(2) Positive edge re-triggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) T = Rt× Ct.
Fig.6 Timing diagram.
January 1995 7
Page 8
Philips Semiconductors Product specification
Dual precision monostable multivibrator
HEF4538B
MSI
(a) Rt= 100 kΩ; Ct= 100 nF.. (b) Rt= 100 kΩ; Ct= 2 nF.
Fig.7 Typical normalized change in output pulse width as a function of ambient temperature; 0% at
VDD= 10 V and T
amb
=25°C.
Fig.8 Typical normalized change in output pulse
width as a function of the supply voltage at
T
=25°C; 0% at
amb
VDD=10V;Rt= 100 kΩ.
January 1995 8
Fig.9 Total supply current as a function of the
output duty factor; Rt= 100 kΩ;
Ct= 100 nF; CL= 50 pF. One monostable
multivibrator switching only.
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