The CD4047 is a versatile CMOS IC that functions as an optional non-stationary multivibrator, capable of operating in both monostable and astable modes. It can be configured as a forward or reverse edge-triggered monostable multivibrator with retriggering capabilities and external counting options. The device features multiple input pins such as TR+, TR-, AST, RET, and CR, allowing for flexible control over its operation. The output signals are available at Q, QÌ…, and QQSC, with the latter being half the amplitude of the Q output but not guaranteed to have a 50% duty cycle in monostable mode.
To function properly, an external capacitor (C) must be connected between the CEXT and REXT/CEXT terminals, while an external resistor (R) should be placed between REXT/CEXT and REXT. When the AST pin is high, the device operates in an astable mode, producing a square wave at the Q and QÌ… outputs whose period depends on the values of R and C. The AST pin also allows for the use of an original pulse or back-pulse, making it suitable for multi-vibrator applications.
In terms of triggering, when TR- is low, a positive edge on the TR+ pin acts as a trigger, while a negative edge on TR- triggers the circuit when TR+ is high. The input pulse width can vary relative to the output pulse width. By connecting a common pulse to both RET and TR+, the multivibrator can be retriggered, but only on the leading edge. Additionally, the output pulse width can be extended using an external counter IC, enhancing the functionality of the CD4047.
The CD4047 is available in several package types, including 14-lead multilayer ceramic in-line (D), sealed ceramic dual in-line (J), plastic dual in-line (P), and ceramic chip carrier (C). This variety makes it suitable for a wide range of applications, from industrial to consumer electronics.
Below are the pin diagrams and functional descriptions of the CD4047:
Figure 1 shows the pin diagram of the CD4047.
Figure 2 illustrates the internal function diagram.
Figure 3 presents the internal logic diagram.
Figure 4 provides the function table of the CD4047.
**CD4047 Pin Function Description:**
1. Pin 1: C – Connects to one end of the external capacitor to form the RC oscillator network.
2. Pin 2: R – Connects to one end of the external resistor to complete the RC oscillator network.
3. Pin 3: RC COMMON – The common connection point of the RC network, linking the resistor and capacitor.
4. Pin 4: ASTABLE – Enables the astable mode; active low.
5. Pin 5: ASTABLE – Enables the astable mode; active high.
6. Pin 6: -TRIGGER – Monostable trigger input, activated by a falling edge.
7. Pin 7: VSS – Ground pin, connected to the power supply's reference ground.
8. Pin 8: +TRIGGER – Monostable trigger input, activated by both rising and falling edges.
9. Pin 9: EXT RESET – External reset input, active high, which resets the output when enabled.
10. Pin 10: Q̅ – Output signal, complementary to Q, with a 180° phase difference.
11. Pin 11: Q – Output signal, complementary to Q̅, with a 180° phase difference.
12. Pin 12: RETRIGGER – Retrigger input used in retriggerable mode; typically connected to pin 8.
13. Pin 13: OSC OUT – Oscillator output, generating a waveform at twice the frequency of Q and Q̅.
14. Pin 14: VDD – Power supply pin, operating within a voltage range of 3V to 15V.
This detailed breakdown of the CD4047’s functionality and pin configuration makes it easier to understand how to integrate this IC into various electronic circuits.
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