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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

HEF4047B MSI Monostable/astable multivibrator
Product specification File under Integrated Circuits, IC04 January 1995

Philips Semiconductors

Product specification

Monostable/astable multivibrator
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 CTC and RCTC, and an external resistor (Rt) must be connected between RTC and RCTC (continued on next page).

HEF4047B MSI

Fig.1 Functional diagram.

FAMILY DATA, IDD LIMITS category MSI See Family Specifications

January 1995

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Philips Semiconductors

Product specification

Monostable/astable multivibrator
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.

HEF4047B MSI
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 VDD is applied.

HEF4047BP(N): HEF4047BD(F): HEF4047BT(D):

14-lead DIL; plastic (SOT27-1) 14-lead DIL; ceramic (cerdip) (SOT73) 14-lead SO; plastic (SOT108-1)

( ): Package Designator North America

Fig.2 Pinning diagram.

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(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.

Philips Semiconductors

Monostable/astable multivibrator HEF4047B MSI

Fig.3 Logic diagram.

Philips Semiconductors

Product specification

Monostable/astable multivibrator
FUNCTIONAL CONNECTIONS PINS CONNECTED TO FUNCTION VDD astable multivibrator free running true gating complement gating monostable multivibrator pos. edge-triggering neg. edge-triggering retriggerable external count 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 VSS = 0 V; inputs at VSS or VDD Tamb (°C) VDD V Leakage current pin 3; output transistor OFF 15 I3 0,3 - 0,3 1 µA SYMBOL -40 MAX. + 25 MIN. MAX. + 85 MAX. down(1) 4, 14 4, 8, 14 4, 14 14 5, 6, 7, 9, 12 5, 7, 9, 12 5, 6, 7, 9 5, 6, 7, 8, 9, 12 8 6 8, 12 - 10, 11 10, 11 10, 11 10, 11 4, 5, 6, 14 4, 6, 14 6, 14 7, 8, 9, 12 7, 8, 9, 12 5, 7, 8, 9, 12 - 5 4 10, 11, 13 10, 11, 13 10, 11, 13 VSS OUTPUT PULSE INPUT FROM PULSE PINS

HEF4047B MSI

OUTPUT PERIOD OR PULSE WIDTH

at pins 10, 11: tA = 4,40 RtCt at pin 13: tA = 2,20 RtCt

at pins 10, 11: tM = 2,48 RtCt

pin 3 at VDD or VSS

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Philips Semiconductors

Product specification

Monostable/astable multivibrator
AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times 20 ns VDD V Propagation delays ASTABLE, ASTABLE OSC. OUTPUT HIGH to LOW 5 10 15 5 LOW to HIGH ASTABLE, ASTABLE O, O HIGH to LOW 10 15 5 10 15 5 LOW to HIGH +/- TRIGGER O, O HIGH to LOW 10 15 5 10 15 5 LOW to HIGH + TRIGGER, RETRIGGER O HIGH to LOW + TRIGGER, RETRIGGER O LOW to HIGH MR O HIGH to LOW MR O LOW to HIGH Output transition times HIGH to LOW 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 LOW to HIGH 10 15 tTLH tTHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL 95 45 30 85 40 30 150 65 50 130 60 45 160 65 50 155 65 50 65 30 25 95 40 30 100 45 35 100 45 35 60 30 20 60 30 20 190 90 60 170 80 60 300 130 100 260 120 90 320 130 100 310 130 100 130 60 50 190 80 60 200 90 70 200 90 70 120 60 40 120 60 40 SYMBOL MIN. TYP. MAX.

HEF4047B MSI

TYPICAL EXTRAPOLATION FORMULA 68 ns + (0,55 ns/pF) CL 43 ns + (0,23 ns/pF) CL 22 ns + (0,16 ns/pF) CL 58 ns + (0,55 ns/pF) CL 29 ns + (0,23 ns/pF) CL 22 ns + (0,16 ns/pF) CL 123 ns + (0,55 ns/pF) CL 54 ns + (0,23 ns/pF) CL 42 ns + (0,16 ns/pF) CL 103 ns + (0,55 ns/pF) CL 49 ns + (0,23 ns/pF) CL 37 ns + (0,16 ns/pF) CL 133 ns + (0,55 ns/pF) CL 54 ns + (0,23 ns/pF) CL 42 ns + (0,16 ns/pF) CL 128 ns + (0,55 ns/pF) CL 54 ns + (0,23 ns/pF) CL 42 ns + (0,16 ns/pF) CL 38 ns + (0,55 ns/pF) CL 19 ns + (0,23 ns/pF) CL 17 ns + (0,16 ns/pF) CL 68 ns + (0,55 ns/pF) CL 29 ns + (0,23 ns/pF) CL 22 ns + (0,16 ns/pF) CL 83 ns + (0,55 ns/pF) CL 34 ns + (0,23 ns/pF) CL 27 ns + (0,16 ns/pF) CL 83 ns + (0,55 ns/pF) CL 34 ns + (0,23 ns/pF) CL 27 ns + (0,16 ns/pF) CL 10 ns + (1,0 ns/pF) CL 9 ns + (0,42 ns/pF) CL 6 ns + (0,28 ns/pF) CL 10 ns + (1,0 ns/pF) CL 9 ns + (0,42 ns/pF) CL 6 ns + (0,28 ns/pF) CL

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Philips Semiconductors

Product specification

Monostable/astable multivibrator

HEF4047B MSI
SYMBOL MIN. TYP. MAX. 60 tWMRH 30 20 220 tW 100 70 30 15 10 110 50 35 TYPICAL EXTRAPOLATION FORMULA

VDD V Minimum MR pulse width; HIGH Minimum input pulse width; any input exept MR 5 10 15 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 5 10 15

· 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

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Philips Semiconductors

Product specification

Monostable/astable multivibrator
1. Astable mode design information

HEF4047B MSI

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.

Fig.4 Astable mode waveforms.

V TR t 1 = R t C t In --------------------------V DD + V TR V DD V TR t 2 = R t C t In -----------------------------2V DD V TR ( V TR ) ( V DD V TR ) t A = 2 ( t 1 + t 2 ) = 2R t C t In ------------------------------------------------------------------------ , where t A = Astable mode pulse width. ( V DD + V TR ) ( 2V DD V TR ) Values for tA are: typ. : VTR = 0,5 VDD; VDD = 5 or 10 V VDD = 15 V min. : VTR = 0,3 VDD; max.: VTR = 0,7 VDD; min. : VTR = 4 V; max.: VTR = 11 V; tA = 4,40 RtCt tA = 4,71 RtCt tA = 4,71 RtCt tA = 4,84 RtCt tA = 4,84 RtCt

thus if tA = 4,40 RtCt is used, the maximum variation will be (+ 7,0%; -0,0%) at 10 V.

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Philips Semiconductors

Product specification

Monostable/astable multivibrator
b. Variations due to changes in VDD

HEF4047B MSI

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.

Fig.5 Typical O and O period accuracy as a function of supply voltage; astable mode; Tamb = 25 °C.

CURVE A B C

fO kHz 10 5 1

Ct pF 100 100 1000

Rt k 220 470 220

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Philips Semiconductors

Product specification

Monostable/astable multivibrator

HEF4047B MSI

Fig.6 Typical O and O period accuracy as a function of supply voltage; astable mode; Tamb = 25 °C.

CURVE A B C D

fO kHz 500 225 100 50

Ct pF 10 100 100 100

Rt k 47 10 22 47

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Philips Semiconductors

Product specification

Monostable/astable multivibrator
2. Monostable mode design information

HEF4047B MSI

The following analysis presents worst case variations from unit-to-unit as a function of transfer-voltage (VTR) shift for one-shot (monostalbe) operation.

Fig.7 Monostable waveforms.

V TR t 1 ` = R t C t In -------------2V DD t M = ( t 1' + t 2 ) ( V TR ) ( V DD V TR ) t M = R t C t In ----------------------------------------------------------- , where t M = Monostable mode pulse width. ( 2V DD V TR ) ( 2V DD )

Values for tM are: typ. : VTR = 0,5 VDD; tM = 2,48 RtCt VDD = 5 to10 V VDD = 15 V Note 1. In the astable mode, the first positive half cycle has a duration of tM; succeeding durations are 1/2 tA. thus if tM = 2,48 RtCt is used, the maximum variation will be (+ 12%; -0,0%) at 10 V. min. : VTR = 0,3 VDD; tM = 2,78 RtCt max.: VTR = 0,7 VDD; tM = 2,52 RtCt min. : VTR = 4 V; max.: VTR = 11 V; tM = 2,88 RtCt tM = 2,56 RtCt

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Philips Semiconductors

Product specification

Monostable/astable multivibrator
3. Retrigger mode operation

HEF4047B MSI

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; tD is variable because tRE (output O) terminates after the second positive edge of the oscillator output appears at flip-flop 4.

Fig.8 Retrigger mode waveforms. 4. External counter option Time tM 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: t ext = ( N 1 ) ( t A ) + ( t M + 1 / 2 t A ) Where text = pulse duration of the circuitry, and N is the number of counts used.

Fig.9 Implementation of external counter option.

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Philips Semiconductors

Product specification

Monostable/astable multivibrator
5. Timing component limitations

HEF4047B MSI

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 Rt or Ct value to maintain oscillation. However, in consideration of accuracy, Ct must be much larger than the inherent stray capacitance in the system (unless this capacitance can be measured and taken into account). Rt must be much larger than the LOCMOS `ON' resistance in series with it, which typically is hundreds of ohms. The recommended values for Rt and Ct to maintain agreement with previously calculated formulae without trimming should be: Ct 100 pF, up to any practical value, 10 k Rt 1 M. 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 Ct is given by the following formulae:

Astable mode:

P = 2 Ct V2 f (f at output pin 13) P = 4 Ct V2 f (f at output pins 10 and 11)
2 2, 9 C t V ( duty cycle ) P = -------------------------------------------------------------------- ( f at output pins 10 and 11 ) T

Monostable mode:

Because the power dissipation does not depend on Rt, 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.

January 1995

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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.

January 1995

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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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