Overview
The CD74HC14E is a hex inverter integrated circuit produced by Texas Instruments. This device contains six independent inverters with Schmitt-trigger inputs, each performing the Boolean function Y = A in positive logic. It is part of the 74HC series, known for its high-speed CMOS logic and wide operating voltage range of 2 V to 6 V. The CD74HC14E is available in a 14-pin PDIP (Plastic Dual In-Line Package) and is designed to operate over a wide temperature range from -55°C to +125°C.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC Supply Voltage | -0.5 | 7 | V |
| Input Clamp Current (VI < -0.5 V or VI > VCC + 0.5 V) | -20 | 20 | mA |
| Output Clamp Current | -20 | 20 | mA |
| Operating Temperature Range | -55 | 125 | °C |
| Input Leakage Current (VI = VCC or 0) | -1 | 1 | µA |
| Supply Current (IO = 0) | 2 | 40 | µA |
| Input Capacitance | 10 | 10 | pF |
| Junction-to-Ambient Thermal Resistance (RθJA) | 69.3 | 69.3 | °C/W |
Key Features
- Buffered Inputs: The device features buffered inputs which help in stabilizing the input signals.
- Schmitt-Trigger Inputs: Each inverter has Schmitt-trigger inputs, providing hysteresis and making the device tolerant to slow or noisy inputs.
- Wide Operating Voltage Range: Operates over a voltage range of 2 V to 6 V.
- Wide Operating Temperature Range: Functions over a temperature range of -55°C to +125°C.
- High Fanout Capability: Supports fanout up to 10 LSTTL loads.
- Power Reduction: Significant power reduction compared to LSTTL logic ICs.
- Balanced CMOS Push-Pull Outputs: Allows the device to sink and source similar currents, ensuring balanced output.
- Clamp Diode Structure: Inputs and outputs have both positive and negative clamping diodes for protection.
Applications
- Synchronize Inverted Clock Inputs: Useful in synchronizing clock signals in digital circuits.
- Debounce a Switch: Can be used to debounce switches, reducing the effects of switch bouncing.
- Invert a Digital Signal: Primary function is to invert digital signals, which is essential in various digital logic circuits.
Q & A
- What is the operating voltage range of the CD74HC14E?
The CD74HC14E operates over a voltage range of 2 V to 6 V.
- What type of inputs does the CD74HC14E have?
The CD74HC14E has Schmitt-trigger inputs.
- What is the maximum operating temperature of the CD74HC14E?
The maximum operating temperature is +125°C.
- How many independent inverters does the CD74HC14E contain?
The device contains six independent inverters.
- What is the purpose of the Schmitt-trigger inputs?
Schmitt-trigger inputs provide hysteresis, making the device tolerant to slow or noisy inputs and helping to reject noise.
- What is the fanout capability of the CD74HC14E?
The device supports fanout up to 10 LSTTL loads.
- How should unused inputs be handled?
Unused inputs must be terminated to either VCC or ground to prevent them from floating.
- What is the typical supply current of the CD74HC14E?
The typical supply current is between 2 µA and 40 µA when IO = 0.
- What is the junction-to-ambient thermal resistance of the CD74HC14E in PDIP package?
The junction-to-ambient thermal resistance (RθJA) is 69.3 °C/W.
- What are some common applications of the CD74HC14E?
Common applications include synchronizing inverted clock inputs, debouncing switches, and inverting digital signals.
