Onsemi MC14584BG Hex Schmitt Trigger Inverter IC: Datasheet, Pinout, and Application Circuit Guide
The Onsemi MC14584BG is a highly reliable CMOS-based integrated circuit that integrates six independent Schmitt trigger inverters into a single package. This device is renowned for its ability to convert noisy or slowly changing input signals into clean, sharp digital output waveforms, making it an indispensable component in a wide array of digital and analog applications. Its inherent hysteresis ensures superior noise immunity, preventing false triggering in electrically noisy environments.
Datasheet Overview and Key Specifications
The MC14584BG operates across a broad voltage range from 3.0V to 18V, offering designers significant flexibility for both 5V and higher voltage systems. Key electrical characteristics include:
High Noise Immunity: Typically 45% of the supply voltage at VDD = 10V.
Low Power Consumption: Quiescent current is exceptionally low (typ. 10nA at 5V), making it ideal for battery-powered devices.
Hysteresis Voltage: A defined positive and negative going threshold voltage (e.g., VT+ ≈ 6.1V, VT- ≈ 3.9V at VDD=10V).
Temperature Range: Designed to operate over the industrial temperature range of -40°C to +85°C.
Package: Offered in a standard 14-pin PDIP, SOIC, or TSSOP package.
Pinout Configuration
Understanding the pinout is crucial for circuit design. The MC14584BG features a straightforward layout:
Pins 1, 3, 5, 9, 11, 13: Inputs for the six inverters (Input A to Input F).
Pins 2, 4, 6, 8, 10, 12: Corresponding outputs for the six inverters (Output A to Output F).
Pin 7 (VSS): Ground (0V reference).
Pin 14 (VDD): Positive supply voltage.
Application Circuit Guide
The primary function of the Schmitt trigger inverter is to square up analog signals. Here are two fundamental application circuits:
1. Signal Conditioning and Waveform Squaring:
This is the most common use case. A noisy or sinusoidal input signal is applied to one of the inverter inputs. The output is a clean, jitter-free digital signal with fast rise and fall times. This is critical for interfacing real-world sensors with digital logic circuits, ensuring reliable data processing.
2. RC Oscillator Circuit:
A single gate from the MC14584BG can easily form a simple yet stable oscillator. By connecting a resistor (R) between the output and input and a capacitor (C) from the input to ground, the hysteresis of the Schmitt trigger creates a predictable oscillation. The frequency of oscillation is approximately given by f ≈ 1 / (0.8 RC). This circuit is perfect for generating clock pulses, tone signals, or timing references.
ICGOODFIND: The Onsemi MC14584BG stands as a fundamental and versatile logic IC. Its built-in hysteresis provides a robust solution for signal integrity challenges that plague digital designs. Whether used for debouncing mechanical switches, cleaning up sensor outputs, or creating simple clocks, this hex inverter offers a perfect blend of simplicity, noise immunity, and low power consumption, making it a staple in every electronics engineer's toolkit.
Keywords:
Schmitt Trigger
Signal Conditioning
Noise Immunity
CMOS IC
RC Oscillator
