PHILIPS HEF4538BF

INTEGRATED CIRCUITS
DATA SHEET
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
Philips Semiconductors
Product specification
HEF4538B
MSI
Dual precision monostable multivibrator
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 Ct and Rt.
The output pulse width (T) is equal to Rt × Ct. The linear
design techniques in LOCMOS guarantee precise control
of the output pulse width.
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,(1) RCTC) for connecting the external
timing components Ct and Rt. Typical pulse width variation
over temperature range is ± 0,2%.
A LOW level at CD terminates the output pulse
immediately. Schmitt-trigger action in the trigger inputs
makes the circuit highly tolerant to slower rise and fall
times.
The HEF4538B may be triggered by either the positive or
the negative edges of the input pulse and will produce an
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
I0A, I0B
input (HIGH to LOW triggered)
I1A, I1B
input (LOW to HIGH triggered)
CDA, CDB
direct reset input (active LOW)
OA, OB
output
OA, OB
complementary output (active LOW)
CTC A, CTC B
external capacitor connections(1)
RCTC A, RCTC B
external capacitor/ resistor
connections
Note
1. Always connected to ground.
Fig.1 Functional diagram.
FAMILY DATA, IDD LIMITS category MSI
See Family specifications.
January 1995
2
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Philips Semiconductors
3
Dual precision monostable multivibrator
January 1995
Product specification
HEF4538B
MSI
Fig.3 Logic diagram.
Philips Semiconductors
Product specification
HEF4538B
MSI
Dual precision monostable multivibrator
FUNCTION TABLE
INPUTS
I0
I1
CD
L
H
H
X
OUTPUTS
O
O
L
H
H
X
L
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
Fig.4
Connection of the external timing
components Rt and Ct.
DC CHARACTERISTICS
VSS = 0 V
Tamb (°C)
VDD
V
− 40
SYMBOL
TYP.
Supply current
MAX.
5
active state
10
(see note)
15
ID
+ 25
TYP.
MAX.
+ 85
TYP.
MAX.
55
µA
150
µA
220
µA
Input leakage
current
15
± IIN
300
(pins 2 and 14)
Note
1. Only one monostable is switching: current present during output pulse (output O is HIGH).
January 1995
4
1000 nA
Philips Semiconductors
Product specification
HEF4538B
MSI
Dual precision monostable multivibrator
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL
MIN.
TYP.
TYPICAL EXTRAPOLATION
FORMULA
MAX.
Propagation delays
I0, I1 → O
HIGH to LOW
5
10
tPHL
15
I0, I1 → O
LOW to HIGH
5
10
tPLH
15
CD → O
HIGH to LOW
5
10
tPHL
15
CD → O
LOW to HIGH
5
10
tPLH
15
Recovery times
5
CD → I0, I1
10
tRCD
200
460 ns
173 ns + (0,55 ns/pF) CL
90
180 ns
79 ns + (0,23 ns/pF) CL
60
120 ns
52 ns + (0,16 ns/pF) CL
220
440 ns
193 ns + (0,55 ns/pF) CL
85
190 ns
74 ns + (0,23 ns/pF) CL
60
120 ns
52 ns + (0,16 ns/pF) CL
125
250 ns
98 ns + (0,55 ns/pF) CL
55
110 ns
44 ns + (0,23 ns/pF) CL
40
80 ns
32 ns + (0,16 ns/pF) CL
125
250 ns
98 ns + (0,55 ns/pF) CL
55
110 ns
44 ns + (0,23 ns/pF) CL
40
80 ns
32 ns + (0,16 ns/pF) CL
20
40 ns
10
20 ns
5
10 ns
15
Retrigger times
O, O → I0, I1
Minimum I0
pulse width; LOW
Minimum I1
pulse width; HIGH
Minimum CD
pulse width; LOW
5
10
0
0
ns
15
0
ns
5
90
45
ns
10
tRO
ns
tWI0L
30
15
ns
15
24
12
ns
5
50
25
ns
10
tWI1H
24
12
ns
15
20
10
ns
5
55
25
ns
10
tWCDL
25
12
ns
15
20
10
ns
Output O or O
5
218
230
242
µs
pulse width
10
213
224
235
µs
15
211
223
234
µs
Output O or O
5
10,3
10,8
11,3
ms
pulse width
10
10,2
10,7
11,2
ms
10,1
10,6
11,1
ms
tWO
tWO
15
Output O or O
5
pulse width
10
15
January 1995
tWO
1,01
1,09
1,11 s
0,99
1,04
1,09 s
0,99
1,04
1,09 s
5
Rt = 100 kΩ
Ct = 0,002 µF
Rt = 100 kΩ
Ct = 0,1 µF
Rt = 100 kΩ
Ct = 10 µF
Philips Semiconductors
Product specification
HEF4538B
MSI
Dual precision monostable multivibrator
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
Change in output O
5
pulse width over
10
temperature (Tamb)
15
SYMBOL
MIN.
∆tWO
TYP.
MAX.
± 0,2
%
± 0,2
%
± 0,2
%
± 1,5
%
±1
%
±1
%
±1
%
Change in output O
∆tWO
pulse width over
VDD range 5 to 15 V
Pulse width variation
5
between circuits
10
in same package
15
∆tWO
Rt = 100 kΩ
Ct = 2 nF to 10 µF
External timing
resistor
Rt
5
−
(1)
kΩ
Ct
2000
−
no limits
pF
External timing
capacitor
Input capacitance
(pin 2 or 14)
CIN
15
pF
Note
1. The maximum permissible resistance Rt , which holds the specified accuracy of tWO, depends on the leakage current
of the capacitor Ct and the leakage of the HEF4538B.
January 1995
6
Philips Semiconductors
Product specification
Dual precision monostable multivibrator
HEF4538B
MSI
Fig.5 Waveforms showing minimum I0, I1, O and CD pulse 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
Philips Semiconductors
Product specification
HEF4538B
MSI
Dual precision monostable multivibrator
(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 Tamb = 25 °C.
Fig.8
Typical normalized change in output pulse
width as a function of the supply voltage at
Tamb = 25 °C; 0% at
VDD = 10 V; Rt = 100 kΩ.
January 1995
Fig.9
8
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.