The CD4047 is a versatile integrated circuit 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 capability and external counting options. The device features several key inputs: TR+, TR-, AST, RET, and CR, while its buffer outputs include Q, \Q, and QQSC. To ensure proper operation in all modes, an external capacitor (C) must be connected between the CEXT and REXT/CEXT terminals, and an external resistor (R) should be placed between the REXT/CEXT and REXT terminals.
When the AST pin is high, the CD4047 operates in an astable mode, producing a square wave at the Q and \Q outputs whose period depends on the values of R and C. The AST signal or its back-pulse allows the circuit to function as an optional multivibrator. The output from the QQSC terminal is half the amplitude of the Q terminal, but it does not guarantee a 50% duty cycle in monostable mode.
The TR- input determines the type of trigger: when TR- is low, a rising edge on TR+ triggers the monostable output. Conversely, when TR+ is high, a falling edge on TR- acts as a reverse trigger. The pulse width of the input signal can vary relative to the output pulse. By applying a common pulse to both the RET and TR+ inputs, the multivibrator can be retriggered, specifically on the leading edge. Additionally, an external counter IC can be used to extend the output pulse width.
The CD4047 is available in multiple 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). These packages make it suitable for a wide range of applications, from industrial control systems to consumer electronics.
Figures 1 through 4 illustrate the pin diagram, internal function, logic diagram, and function table of the CD4047, providing a clear visual reference for understanding its operation.
**Pin Function Description of CD4047:**
1. **Pin 1 – C**: Connects to one end of the external capacitor (C) forming part of the RC oscillator network.
2. **Pin 2 – R**: Connects to one end of the external resistor (R), completing the RC oscillator network.
3. **Pin 3 – RC COMMON**: Serves as the common connection point for the RC network, linking the other ends of R and C.
4. **Pin 4 – ASTABLE (active low)**: Enables the astable mode of operation; when low, the circuit generates continuous oscillations.
5. **Pin 5 – ASTABLE (active high)**: Also enables the astable mode, but activates when high.
6. **Pin 6 – -TRIGGER**: Monostable trigger input, activated by a falling edge; same function as Pin 8.
7. **Pin 7 – VSS**: Ground pin, typically connected to the power supply’s reference ground.
8. **Pin 8 – +TRIGGER**: Monostable trigger input, responsive to both rising and falling edges; same function as Pin 6.
9. **Pin 9 – EXT RESET**: External reset input, active high; when triggered, resets the output of the CD4047.
10. **Pin 10 – \Q**: Output pin, complementary to Pin 11, with a 180° phase difference.
11. **Pin 11 – Q**: Output pin, complementary to Pin 10, with a 180° phase difference.
12. **Pin 12 – RETRIGGER**: Retrigger input, used in retriggerable mode; often connected to Pin 8.
13. **Pin 13 – OSC OUT**: Oscillator output, producing a waveform with twice the frequency of the Q and \Q outputs.
14. **Pin 14 – VDD**: Power supply pin, supporting a voltage range of 3V to 15V.
This detailed pin configuration allows users to tailor the CD4047’s functionality according to their specific application needs.
IDC Type
IDC Type
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