onsemi MC14022BDR2G: Datasheet, Pinout, and Application Circuit Overview
The MC14022BDR2G from onsemi is a CMOS-based 4-stage Johnson decade counter with 10 decoded outputs. As a member of the renowned 4000 series logic family, this integrated circuit is prized for its low power consumption, wide supply voltage range (3V to 18V), and high noise immunity, making it a versatile solution for a multitude of digital counting and sequencing applications.
Datasheet Overview: Key Specifications
A thorough review of the datasheet reveals the IC's core electrical characteristics and limits. The device operates over a wide temperature range, typically from -55°C to +125°C, ensuring reliability in harsh environments. Key specifications include:
Supply Voltage Range (VDD): 3.0 V to 18.0 V
Low Power Consumption: 100% tested for quiescent current at 20 V
High Noise Immunity: 0.45 VDD (typ.)
Low Output Drive Current: Suitable for driving other CMOS logic, LEDs, or low-current relays.
The MC14022BDR2G is offered in a SOIC-16 surface-mount package, which is suitable for automated PCB assembly.
Pinout Configuration
Understanding the pinout is critical for circuit design. The 16-pin configuration is as follows:
Pin 1 (Q5): Decoded Output 5
Pin 2 (Q1): Decoded Output 1
Pin 3 (Q0): Decoded Output 0
Pin 4 (Q2): Decoded Output 2
Pin 5 (Q6): Decoded Output 6
Pin 6 (Q7): Decoded Output 7
Pin 7 (Q3): Decoded Output 3
Pin 8 (VSS): Ground (Negative Supply Voltage)
Pin 9 (Q8): Decoded Output 8
Pin 10 (Q4): Decoded Output 4
Pin 11 (Q9): Decoded Output 9
Pin 12 (Q5-9): "CARRY OUT" Output (Acts as a divide-by-10 output)
Pin 13 (CLOCK INHIBIT): A high level on this pin disables the clock.
Pin 14 (CLOCK): Negative-edge triggered clock input.
Pin 15 (RESET): A high level on this pin resets the counter to the Q0 output.
Pin 16 (VDD): Positive Supply Voltage
Application Circuit Overview: A Basic Frequency Divider
A fundamental application for the MC14022B is a divide-by-10 counter or frequency divider. This circuit is foundational in digital clocks, timers, and instrumentation.
Circuit Operation:
1. A clock signal (e.g., from a 555 timer oscillator) is applied to Pin 14 (CLOCK).
2. The RESET (Pin 15) and CLOCK INHIBIT (Pin 13) pins are tied to VSS (ground) to enable normal counting operation.
3. With each falling edge of the input clock pulse, the counter advances. The ten outputs (Q0-Q9) sequentially go high.
4. The CARRY OUT signal (Pin 12) provides one complete pulse for every ten input clock pulses, effectively dividing the input frequency by ten. This output can be fed into the clock input of a subsequent counter stage to create higher-division ratios (e.g., divide-by-100).
5. The specific decoded outputs (Q0-Q9) can be used to directly drive indicators like LEDs for a visual representation of the count or to control other parts of a system in a precise sequence.
The onsemi MC14022BDR2G remains a highly reliable and effective choice for digital counting and sequencing tasks. Its robust CMOS design, straightforward Johnson counter architecture, and decoded outputs provide engineers with a simple yet powerful building block for creating dividers, timers, and state machines. For projects requiring a proven, low-power decade counter with a wide operating voltage, the MC14022BDR2G is an excellent component to consider.
Keywords:
Johnson Decade Counter
CMOS Logic IC
Frequency Divider
Decoded Outputs
SOIC-16 Package
