CD4047BC

CD4047BC Low Power Monostable/Astable Multivibrator

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CD4047BC Low Power Monostable/Astable Multivibrator

October 1987 Revised March 2002

CD4047BC Low Power Monostable/Astable Multivibrator
General Description
The CD4047B is capable of operating in either the monostable or astable mode. It requires an external capacitor (between pins 1 and 3) and an external resistor (between pins 2 and 3) to determine the output pulse width in the monostable mode, and the output frequency in the astable mode. Astable operation is enabled by a high level on the astable input or low level on the astable input. The output frequency (at 50% duty cycle) at Q and Q outputs is determined by the timing components. A frequency twice that of Q is available at the Oscillator Output; a 50% duty cycle is not guaranteed. Monostable operation is obtained when the device is triggered by LOW-to-HIGH transition at trigger input or HIGH-to-LOW transition at - trigger input. The device can be retriggered by applying a simultaneous LOW-to-HIGH transition to both the trigger and retrigger inputs. A high level on Reset input resets the outputs Q to LOW, Q to HIGH.

Monostable Multivibrator Features
s Positive- or negative-edge trigger s Output pulse width independent of trigger pulse duration s Retriggerable option for pulse width expansion s Long pulse widths possible using small RC components by means of external counter provision s Fast recovery time essentially independent of pulse width s Pulse-width accuracy approaching 100% maintained at duty cycles

Astable Multivibrator Features
s Free-running or gatable operating modes s 50% duty cycle s Oscillator output available s Good astable frequency stability typical 2% 0.03%/ C 100 kHz frequency 0.5% 0.015%/ C 10 kHz deviation (circuits trimmed to frequency VDD 10V 10%)

Features
s Wide supply voltage range: 3.0V to 15V s High noise immunity: 0.45 VDD (typ.) s Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS

Applications
Frequency discriminators Timing circuits Time-delay applications Envelope detection Frequency multiplication Frequency division

Special Features
s Low power consumption: special CMOS oscillator configuration s Monostable (one-shot) or astable (free-running) operation s True and complemented buffered outputs s Only one external R and C required

Ordering Code:
Order Number CD4047BCM CD4047BCN Package Number M14A N14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.

2002 Fairchild Semiconductor Corporation

DS005969

www.fairchildsemi.com