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 HEF4047B MSI 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.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator 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.
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Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator FUNCTIONAL CONNECTIONS PINS CONNECTED TO FUNCTION VDD VSS OUTPUT PULSE INPUT FROM PULSE PINS OUTPUT PERIOD OR PULSE WIDTH 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 complement gating 6, 14 5, 7, 8, 9, 12 4 10, 11, 13 tA = 4,40 RtCt at pin 13: tA = 2,20 RtCt pos.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V SYMBOL MIN. TYP. MAX. TYPICAL EXTRAPOLATION FORMULA Propagation delays ASTABLE, ASTABLE → OSC.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator VDD V Minimum MR pulse 5 width; HIGH 10 SYMBOL MIN. TYP. MAX.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator 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. Fig.4 Astable mode waveforms.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator b. Variations due to changes in VDD 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.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator Fig.6 Typical O and O period accuracy as a function of supply voltage; astable mode; Tamb = 25 °C.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator 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. Fig.7 Monostable waveforms.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator 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).
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator 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 Rt or Ct value to maintain oscillation.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator 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.
Philips Semiconductors Product specification HEF4047B MSI Monostable/astable multivibrator Fig.12 Power consumption as a function of the output frequency at O or O; VDD = 15 V; astable mode.
