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Teilenummer | CD4047BC |
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Beschreibung | Low Power Monostable/Astable Multivibrator | |
Hersteller | Fairchild Semiconductor | |
Logo | ||
Gesamt 9 Seiten 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 capac-
itor (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 fre-
quency (at 50% duty cycle) at Q and Q outputs is deter-
mined 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 trig-
gered 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.
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
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
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 maintained at duty cycles
approaching 100%
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%)
Applications
• Frequency discriminators
• Timing circuits
• Time-delay applications
• Envelope detection
• Frequency multiplication
• Frequency division
Ordering Code:
Order Number Package Number
Package Description
CD4047BCM
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
CD4047BCN
N14A
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
Typical Performance Characteristics
Typical Q, Q, Osc Out Period Accuracy vs
Supply Voltage (Astable Mode Operation)
Typical Q, Q, Pulse Width Accuracy vs
Supply Voltage Monostable Mode Operation
fQ, Q
A 1000 kHz
B 100 kHz
C 10 kHz
D 1 kHz
E 100 Hz
R
22k
22k
220k
220k
2.2M
C
10 pF
100 pF
100 pF
1000 pF
1000 pF
Typical Q, Q and Osc Out Period Accuracy
vs Temperature Astable Mode Operation
tM
A 2 µs
B 7 µs
C 60 µs
D 550 µs
E 5.5 ms
R
22k
22k
220k
220k
2.2M
C
10 pF
100 pF
100 pF
1000 pF
1000 pF
Typical Q and Q Pulse Width Accuracy vs
Temperature Monostable Mode Operation
fQ, Q
A 1000 kHz
B 100 kHz
C 10 kHz
D 1 kHz
R
22k
22k
220k
220k
C
10 pF
100 pF
100 pF
1000 pF
tM
A 2 µs
B 7 µs
C 60 µs
D 550 µs
Note:
Minimum Value of R: 10 K Ω
Maximum Value of R: 1 Meg Ω
Minimum Value of C for Astable Mode: 100 pF
Minimum Value of C for Monostable Mode: 1000 pF
www.fairchildsemi.com
6
R
22k
22k
220k
220k
C
10 pF
100 pF
100 pF
1000 pF
6 Page | ||
Seiten | Gesamt 9 Seiten | |
PDF Download | [ CD4047BC Schematic.PDF ] |
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