onsemi MC14106BDR2G Hex Inverting Buffer/Converter: Datasheet, Pinout, and Application Circuit Guide
The onsemi MC14106BDR2G is a member of the 4000B series of CMOS logic integrated circuits, renowned for their high noise immunity and low power consumption. This specific IC is a hex inverting buffer/converter, meaning it contains six independent inverting buffers within a single 16-pin package. Its primary function is to isolate, condition, and invert digital signals, making it a fundamental component in a wide array of digital systems, from simple logic level shifting to driving high-capacitance loads.
This guide provides a detailed overview of its datasheet specifications, pinout configuration, and a practical application circuit.
Datasheet Overview and Key Specifications
The MC14106BDR2G is built using advanced CMOS technology, which provides it with several key advantages:
Wide Operating Voltage Range (3V to 18V): This flexibility allows it to interface with both TTL (5V) and higher voltage logic systems, making it an excellent level shifter.
High Sink and Source Current: Capable of driving up to 8 mA at 15V, it can directly drive LEDs, small relays, and other peripherals that simpler logic gates cannot.
Low Power Consumption: A hallmark of CMOS technology, it draws negligible static current, making it ideal for battery-powered applications.
High Noise Immunity: Typically 45% of the supply voltage, which ensures stable operation in electrically noisy environments.
Buffered Outputs: Each inverter is buffered, providing high gain and improved output drive capability.
Absolute Maximum Ratings are critical for reliable operation. Key ratings include:
DC Supply Voltage: -0.5V to +18V
Input Voltage: -0.5V to VDD + 0.5V
Storage Temperature Range: -65°C to +150°C
Pinout Configuration
The MC14106BDR2G is housed in a SOIC-16 package. Its pinout is standard for hex inverter ICs:
Pins 1, 3, 5, 9, 11, 13 (Inputs): The inputs to the six individual inverters (1A through 6A).
Pins 2, 4, 6, 8, 10, 12 (Outputs): The corresponding inverted outputs (1Y through 6Y).
Pin 7 (VSS): Ground (0V reference).
Pin 14 (VDD): Positive supply voltage terminal (3V to 18V).
This symmetrical layout simplifies PCB design and routing.
Application Circuit Guide: Crystal Oscillator
A classic application for a hex inverter like the MC14106BDR2G is building a Pierce crystal oscillator circuit, which provides a stable and accurate clock source for microcontrollers and digital systems.
Circuit Description:
1. Inverter as Amplifier: One of the six inverters (e.g., U1A) is biased into its linear region using a large feedback resistor, R1 (e.g., 1 MΩ to 10 MΩ). This resistor forces the inverter to operate at its midpoint, making it a high-gain inverting amplifier.
2. Crystal (Xtal): The crystal is connected between the input and output of the amplifier. It acts as a highly selective filter that determines the frequency of oscillation.
3. Load Capacitors (C1 & C2): These capacitors, typically in the range of 10pF to 22pF, form a capacitive voltage divider and provide the necessary 180-degree phase shift for oscillation to occur. Their values are crucial and often specified by the crystal manufacturer.
4. Output Buffer: A second inverter (U1B) is used to buffer the oscillating signal. This squares up the waveform and isolates the oscillator from load variations downstream, ensuring a clean digital clock signal for the rest of the circuit.
Why it Works: The circuit satisfies the Barkhausen criteria for oscillation: the loop gain is greater than 1, and the total phase shift around the loop is 360 degrees (or 0 degrees). The crystal provides 180 degrees of phase shift at its resonant frequency, and the inverting amplifier provides the other 180 degrees.
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ICGOODFIND Summary: The onsemi MC14106BDR2G is a versatile and robust hex inverting buffer essential for digital design. Its strength lies in its wide voltage range, significant output drive capability, and high noise immunity, making it perfect for level shifting, signal isolation, clock generation, and driving various loads. Its simple pinout and predictable behavior make it a reliable workhorse for both hobbyists and professional engineers.
Keywords: Hex Inverting Buffer, Level Shifter, CMOS Logic, Crystal Oscillator Circuit, SOIC-16 Package.
