DATA SHEET OF IC CD407

General Description
The CD4047 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 theastable 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

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

SPECIAL FEATURES
■ Low power consumption: special CMOS oscillator configuration
■ 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 trigger
■ Output pulse width independent of trigger pulse duration
■ Retriggerable option for pulse width expansion
■ Long pulse widths 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
■ 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%)

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


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