MC14538BDG

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Logic - Multivibrators refer to a family of semiconductor devices that are used to maintain a circuit in either a low-amplitude output or a high-amplitude output.The MC14538BDG is a one-shot, dual retriggerable, and monostable multivibrator with independently selectable negative or positive triggered input.

Introduction of MC14538BDG

The MC14538BDG is a monolithic CMOS integrated circuit intended for use with single-gate logic families such as the 76XX, 9CXX, and others. The device features two independent retriggerable one-shots operating from a single supply voltage, which allows for the independent control of modulation levels, tone duration, or even complete data-word sequences, where the one-shots are set to different pulse widths. The device has an active-low input, an active-high input, a negative reset input and two complementary outputs for each one-shot.

Overview of MC14538BDG

• Low supply current: 1.5 μA (typical)
• Input current: 0.1 μA (typical)
• Wide supply voltage: 2.7 V to 6.5 V
• High noise immunity: > 2 V
• Pulse width stability: ±2%.

Features of MC14538BDG

• Retriggerable output
• Programmable pulse width
• Low supply current
• In-circuit programmable

Application of MC14538BDG

The MC14538BDG chip is widely used for a variety of applications including remote control, security systems, automotive, home appliances, and other consumer electronics. It can be used in audio applications such as audio delay circuits, Level shifting applications, automotive sound effects and home appliance sound control systems. It is also used in the remote control of consumer electronics, industrial controls and medical instrumentation.

Working Principle of MC14538BDG

The MC14538BDG one-shot is activated (triggered) when a logic-level transition is detected at either of the two retriggerable inputs (IN1 or IN2). When triggered, the pulse width (time period) of the output pulse is determined by the value of a single external timing capacitor (C) and a single external timing resistor (R). If the retrigger input is high, the device is retriggered and the output is held high until the next input pulse condition occurs. When the input triggers, the retrigger input must be low.The reset (RST) input of the MC14538BDG one-shot resets the device, forcing both outputs low. When the RST input is high, the device is reset and the output pulse width is determined by the value of the timing resistor and capacitor. This can be used to reset the one-shot prior to the start of a new pulse cycle or to compare the output pulse width to a reference time period.The output pulse width of the MC14538BDG is directly proportional to the value of the external timing capacitor and resistor of the device. The resistor and capacitor values can be set to create a pulse width up to approximately 100mS for a single supply and 200mS for a dual supply device.

Conclusion

The MC14538BDG is a dual retriggerable, monostable multivibrator with independently selectable negative or positive triggered input. It has two independent retriggerable one-shots operating from a single supply voltage, and is mainly used for a variety of applications, such as audio applications, remote control, automotive, and home appliances. Its working principle is based on the values of the external timing capacitor and resistor, and its output pulse width can be adjusted accordingly.

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