CD4047BC
Low Power Monostable/Astable Multivibrator
CD4047BC Low Power Monostable/Astable Multivibrator
October 1987
Revised May 1999
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, an d the output frequency in the
astable mode.
Astable operation i s ena bl ed b y a hi gh level on the astable
input or low level on the astable
quency (at 50% duty cycle) at Q and Q
mined by the timing c omponents. A frequency tw ice that of
Q is available at the Oscillator Outp ut; a 50 % duty cyc le is
not guaranteed.
Monostable operati on is obtained when t he 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 simulta neous 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.
input. The output fre-
outputs is deter-
Features
■ Wide supply voltage range: 3.0V to 15V
■ High noise immunity: 0.45 V
■ 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
DD
(typ.)
■ 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 poss ible u sing s mall RC c ompon ent s
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 V
±10%)
VDD = 10V, VO = 1V or 9V3.04.53.03.0V
VDD = 15V, VO = 1.5V or 13.5V4.06.754.04.0V
VDD = 10V, VO = 1V or 9V7.07.05.57.0V
VDD = 15V, VO = 1.5V or 13.5V11.011.0 8.2511.0V
VDD = 15V, VO = 1.5V3.63.08.82.4mA
VDD = 15V, VO = 13.5V−3.6−3.0−8.8−2.4mA
VDD = 15V, VIN = 15V0.310−50.31.0µA
Recommended Operating
Conditions
DC
DC Supply Voltage (V
DC
Input Voltage (VIN)0 to V
Operating Temperature Range (TA)−40°C to +85°C
Note 2: “Absolute Maximum Ratings” ar e those value s beyond which the
safety of the device cannot be guaranteed. They are not meant to imply
that the devices should b e operate d at thes e limits. T he table of “Recommended Operating Conditions” and “Electrical Characteristics” provides
conditions for actua l device operation.
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provide d in the labe l ing, can be re asonably expected to result in a significant injury to the
user.
Package Number N14A
2. A critical componen t in any com ponen t of a life s upport
device or system whose failu re to perform can b e reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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