Page 1
DATA SH EET
Product specification
File under Integrated Circuits, IC04
January 1995
INTEGRATED CIRCUITS
HEF4047B
MSI
Monostable/astable multivibrator
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
Page 2
January 1995 2
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
DESCRIPTION
The HEF4047B consists of a gatable astable multivibrator
with logic techniques incorporated to permit positive or
negative edge-triggered monostable multivibrator action
with retriggering and external counting options.
Inputs include + TRIGGER, − TRIGGER, ASTABLE,
ASTABLE, RETRIGGER and MR (Master Reset).
Buffered outputs are O,O and OSCILLATOR OUTPUT. In
all modes of operation an external capacitor (Ct) must be
connected between CTCand RCTC, and an external
resistor (R
t
) must be connected between RTCand
RCTC(continued on next page).
FAMILY DATA, I
DD
LIMITS category MSI
See Family Specifications
Fig.1 Functional diagram.
Page 3
January 1995 3
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
Astable operation is enabled by a HIGH level on the
ASTABLE input. The period of the square wave at O and
O outputs is a function of the external components
employed. ‘True’ input pulses on the ASTABLE or
‘complement’ pulses on the ASTABLE input, allow the
circuit to be used as a gatable multivibrator. The
OSCILLATOR OUTPUT period will be half of the O output
in the astable mode. However, a 50% duty factor is not
guaranteed at this output.
In the monostable mode, positive edge-triggering is
accomplished by applying a leading-edge pulse to the
+ TRIGGER input and a LOW level to the − TRIGGER
input. For negative edge-triggering, a trailing-edge pulse is
applied to the − TRIGGER and a HIGH level to the
+ TRIGGER. Input pulses may be of any duration relative
to the output pulse. The multivibrator can be retriggered
(on the leading-edge only) by applying a common pulse to
both the RETRIGGER and + TRIGGER inputs. In this
mode the output pulse remains HIGH as long as the input
pulse period is shorter than the period determined by the
RC components.
An external count down option can be implemented by
coupling O to an external ‘N’ counter and resetting the
counter with the trigger pulse. The counter output pulse is
fed back to the ASTABLE input and has a duration equal
to N times the period of the multivibrator. A HIGH level on
the MR input assures no output pulse during an ON-power
condition. This input can also be activated to terminate the
output pulse at any time. In the monostable mode, a HIGH
level or power-ON reset pulse must be applied to MR,
whenever VDDis applied.
Fig.2 Pinning diagram.
HEF4047BP(N): 14-lead DIL; plastic
(SOT27-1)
HEF4047BD(F): 14-lead DIL; ceramic (cerdip)
(SOT73)
HEF4047BT(D): 14-lead SO; plastic
(SOT108-1)
( ): Package Designator North America
Page 4
January 1995 4
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
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Fig.3 Logic diagram.
(1) Special input protection that allows operating input voltages
outside the supply voltage lines. Compared to the standard input
protection pin 3 is more sensitive to static discharge; extra
handling precautions are recommended.
Page 5
January 1995 5
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
FUNCTIONAL CONNECTIONS
Notes
1. Input pulse to RESET of external counting chip; external counting chip output to pin 4.
2. In all cases, external resistor between pins 2 and 3, external capacitor between pins 1 and 3.
DC CHARACTERISTICS
V
SS
= 0 V; inputs at VSSor V
DD
FUNCTION
PINS CONNECTED TO OUTPUT
PULSE
FROM
PINS
OUTPUT
PERIOD
OR
PULSE WIDTH
V
DD
V
SS
INPUT
PULSE
astable multivibrator
free running 4, 5, 6, 14 7, 8, 9, 12 − 10, 11, 13 at pins 10, 11:
true gating 4, 6, 14 7, 8, 9, 12 5 10, 11, 13 t
A
= 4,40 RtC
t
at pin 13:
tA= 2,20 RtC
t
complement gating 6, 14 5, 7, 8, 9, 12 4 10, 11, 13
monostable multivibrator
pos. edge-triggering 4, 14 5, 6, 7, 9, 12 8 10, 11
neg. edge-triggering 4, 8, 14 5, 7, 9, 12 6 10, 11 at pins 10, 11:
retriggerable 4, 14 5, 6, 7, 9 8, 12 10, 11 t
M
= 2,48 RtC
t
external count down
(1)
14 5, 6, 7, 8, 9, 12 − 10, 11
V
DD
V
SYMBOL
T
amb
(°C)
−40 + 25 + 85
MAX. MIN. MAX. MAX.
Leakage current
15 I
3
0,3 − 0,3 1 µA
pin 3 at
VDDor V
SS
pin 3; output
transistor OFF
Page 6
January 1995 6
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
=25°C; CL= 50 pF; input transition times ≤ 20 ns
V
DD
V
SYMBOL MIN. TYP. MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
ASTABLE, ASTABLE → OSC. OUTPUT 5 95 190 68 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
45 90 43 ns + (0,23 ns/pF) C
L
15 30 60 22 ns + (0,16 ns/pF) C
L
5 85 170 58 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
40 80 29 ns + (0,23 ns/pF) C
L
15 30 60 22 ns + (0,16 ns/pF) C
L
ASTABLE, ASTABLE → O, O 5 150 300 123 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
65 130 54 ns + (0,23 ns/pF) C
L
15 50 100 42 ns + (0,16 ns/pF) C
L
5 130 260 103 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
60 120 49 ns + (0,23 ns/pF) C
L
15 45 90 37 ns + (0,16 ns/pF) C
L
+/− TRIGGER → O, O 5 160 320 133 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
65 130 54 ns + (0,23 ns/pF) C
L
15 50 100 42 ns + (0,16 ns/pF) C
L
5 155 310 128 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
65 130 54 ns + (0,23 ns/pF) C
L
15 50 100 42 ns + (0,16 ns/pF) C
L
+ TRIGGER, RETRIGGER → O 5 65 130 38 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
30 60 19 ns + (0,23 ns/pF) C
L
15 25 50 17 ns + (0,16 ns/pF) C
L
+ TRIGGER, RETRIGGER → O 5 95 190 68 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
40 80 29 ns + (0,23 ns/pF) C
L
15 30 60 22 ns + (0,16 ns/pF) C
L
MR → O 5 100 200 83 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
45 90 34 ns + (0,23 ns/pF) C
L
15 35 70 27 ns + (0,16 ns/pF) C
L
MR → O 5 100 200 83 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
45 90 34 ns + (0,23 ns/pF) C
L
15 35 70 27 ns + (0,16 ns/pF) C
L
Output transition times 5 60 120 10 ns + (1,0 ns/pF) C
L
HIGH to LOW 10 t
THL
30 60 9 ns + (0,42 ns/pF) C
L
15 20 40 6 ns + (0,28 ns/pF) C
L
5 60 120 10 ns + (1,0 ns/pF) C
L
LOW to HIGH 10 t
TLH
30 60 9 ns + (0,42 ns/pF) C
L
15 20 40 6 ns + (0,28 ns/pF) C
L
Page 7
January 1995 7
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
Minimum MR pulse 5 60 30
width; HIGH 10 t
WMRH
30 15
15 20 10
Minimum input
pulse width; any 5 220 110
input exept MR 10 t
W
100 50
15 70 35
V
DD
V
SYMBOL MIN. TYP. MAX.
TYPICAL EXTRAPOLATION
FORMULA
APPLICATION INFORMATION
General features:
• Monostable (one-shot) or astable (free-running)
operation
• True and complemented buffered outputs
• Only one external R and C required
Monostable multivibrator features:
• Positive- or negative-edge triggering
• Output pulse width independent of trigger pulse duration
• Retriggerable option for pulse-width expansion
• Long pulse width possible using small RC components
by means of external counter provision
• Fast recovery time essentially independent of pulse
width
• Pulse-width accuracy maintained at duty cycles
approaching 100%
Astable multivibrator features:
• Free-running or gatable operating modes
• 50% duty cycle
• Oscillator output available
Page 8
January 1995 8
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
1. Astable mode design information
a. Unit-to-unit transfer-voltage variations
The following analysis presents worst-case variations from unit-to-unit as a function of transfer-voltage (VTR) shift for free
running (astable) operation.
Values for t
A
are:
thus if t
A
= 4,40 RtCtis used, the maximum variation will be (+ 7,0%; −0,0%) at 10 V.
typ. : VTR= 0,5 VDD;tA= 4,40 RtC
t
VDD= 5 or 10 V
min. : V
TR
= 0,3 VDD;tA= 4,71 RtC
t
max.: VTR= 0,7 VDD;tA= 4,71 RtC
t
VDD= 15 V
min. : V
TR
=4 V; tA= 4,84 RtC
t
max.: VTR= 11 V; tA= 4,84 RtC
t
Fig.4 Astable mode waveforms.
t
1
RtCtIn
V
TR
V
DDVTR
+
--------------------------- -
–=
t
2
RtCtIn
V
DDVTR
–
2V
DDVTR
–
-------------------------------
–=
t
A
2t1t2+()2RtCtIn
V
TR
()VDDVTR–()
V
DDVTR
+()2V
DDVTR
–()
-------------------------------------------------------------------------
, where t
A
Astable modepulse width.=–==
Page 9
January 1995 9
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
b. Variations due to changes in V
DD
In addition to variations from unit-to-unit, the astable period may vary as a function of frequency with respect to VDD.
Typical variations are presented graphically in Figs 5 and 6 with 10 V as a reference.
CURVE f
O
kHz
C
t
pF
R
t
kΩ
A 10 100 220
B 5 100 470
C 1 1000 220
Fig.5 Typical O and O period accuracy as a function of supply voltage; astable mode; T
amb
=25°C.
Page 10
January 1995 10
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
CURVE f
O
kHz
C
t
pF
R
t
kΩ
A 500 10 47
B 225 100 10
C 100 100 22
D 50 100 47
Fig.6 Typical O and O period accuracy as a function of supply voltage; astable mode; T
amb
=25°C.
Page 11
January 1995 11
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
2. Monostable mode design information
The following analysis presents worst case variations from unit-to-unit as a function of transfer-voltage (VTR) shift for
one-shot (monostalbe) operation.
Values for tMare:
Note
1. In the astable mode, the first positive half cycle has a duration of t
M
; succeeding durations are1⁄2tA.
thus if tM= 2,48 RtCtis used, the maximum variation will be (+ 12%; −0,0%) at 10 V.
typ. : VTR= 0,5 VDD;tM= 2,48 RtC
t
VDD= 5 to10 V
min. : V
TR
= 0,3 VDD;tM= 2,78 RtC
t
max.: VTR= 0,7 VDD;tM= 2,52 RtC
t
VDD= 15 V
min. : V
TR
=4 V; tM= 2,88 RtC
t
max.: VTR= 11 V; tM= 2,56 RtC
t
Fig.7 Monostable waveforms.
t1‘RtCtIn
V
TR
2V
DD
--------------
–=
t
M
t1' t2+()=
t
M
R
t
C
t
In
V
TR
()VDDVTR–()
2V
DDVTR
–()2VDD()
------------------------------------------------------------
, where t
M
Monostable mode pulse width.=–=
Page 12
January 1995 12
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
3. Retrigger mode operation
The HEF4047B can be used in the retrigger mode to extend the output pulse duration, or to compare the frequency of
an input signal with that of the internal oscillator. In the retrigger mode the input pulse is applied to pins 8 and 12, and
the output is taken from pin 10 or 11. Normal monostable action is obtained when one retrigger pulse is applied (Fig.8).
Extended pulse duration is obtained when more than one pulse is applied. For two input pulses, tRE=t1’+t1+2t2.
For more than two pulses, tRE(output O), terminates at some variable time, tD, after the termination of the last retrigger
pulse; tDis variable because tRE(output O) terminates after the second positive edge of the oscillator output appears at
flip-flop 4.
4. External counter option
Time t
M
can be extended by any amount with the use of external counting circuitry. Advantages include digitally
controlled pulse duration, small timing capacitors for long time periods, and extremely fast recovery time. A typical
implementation is shown in Fig.9.
The pulse duration at the output is:
Where t
ext
= pulse duration of the circuitry, and N is the number of counts used.
Fig.8 Retrigger mode waveforms.
t
ext
N1–()t
A
() tM12t
A
⁄+()+=
Fig.9 Implementation of external counter option.
Page 13
January 1995 13
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
5. Timing component limitations
The capacitor used in the circuit should be non-polarized and have low leakage (i.e. the parallel resistance of the
capacitor should be an order of magnitude greater than the external resistor used).
There is no upper or lower limit for either Rtor Ctvalue to maintain oscillation.
However, in consideration of accuracy, Ctmust be much larger than the inherent stray capacitance in the system (unless
this capacitance can be measured and taken into account).
Rtmust be much larger than the LOCMOS ‘ON’ resistance in series with it, which typically is hundreds of ohms.
The recommended values for Rtand Ctto maintain agreement with previously calculated formulae without trimming
should be:
Ct≥ 100 pF, up to any practical value,
10 kΩ≤R
t
≤1 MΩ.
6. Power consumption
In the standby mode (monostable or astable), power dissipation will be a function of leakage current in the circuit.
For dynamic operation, the power needed to charge the external timing capacitor C
t
is given by the following formulae:
Because the power dissipation does not depend on R
t
, a design for minimum power dissipation would be a small value
of Ct. The value of R would depend on the desired period (within the limitations discussed previously).
Typical power consumption in astable mode is shown in Figs 10, 11 and 12.
Astable mode: P = 2 C
t
V2f (f at output pin 13)
P = 4 C
t
V2f (f at output pins 10 and 11)
Monostable mode:
P=
29C
t
V
2
,
duty cycle()
T
---------------------------------------------------------------------
f at output pins 10 and 11()
Page 14
January 1995 14
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
Fig.10 Power consumption as a function of the output frequency at O or O; VDD= 5 V; astable mode.
Fig.11 Power consumption as a function of the output frequency at O or O; VDD= 10 V; astable mode.
Page 15
January 1995 15
Philips Semiconductors Product specification
Monostable/astable multivibrator
HEF4047B
MSI
Fig.12 Power consumption as a function of the output frequency at O or O; VDD= 15 V; astable mode.
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