Overview
The SN74AC14NSR is a hex Schmitt-trigger inverter integrated circuit produced by Texas Instruments. This device is part of the 74AC series, known for its high-speed and low-power CMOS logic. It features six independent inverting buffers with Schmitt-trigger inputs, which provide hysteresis to improve noise immunity and reduce the likelihood of spurious switching due to noise or slow input transitions.
The SN74AC14NSR is available in a 14-pin SOP (Small Outline Package) and operates over a wide voltage range of 2V to 6V, making it versatile for various digital logic applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage) | 2 | 6 | V | |
| VI (Input Voltage) | 0 | VCC | V | |
| VO (Output Voltage) | 0 | VCC | V | |
| IOH (High-Level Output Current) | -12 | -24 | mA (at VCC = 3V to 5.5V) | |
| IOL (Low-Level Output Current) | 12 | 24 | mA (at VCC = 3V to 5.5V) | |
| TA (Operating Free-Air Temperature) | -40 | 85 | °C | |
| tPLH (Propagation Delay, A to Y) | 1.5 | 5 | 10 | ns (at VCC = 5V) |
| tPHL (Propagation Delay, A to Y) | 1.5 | 5 | 9.5 | ns (at VCC = 5V) |
| RθJA (Junction-to-Ambient Thermal Resistance) | 92.4 | °C/W (for SOP package) |
Key Features
- VCC Operation Range: 2V to 6V, allowing for operation in a variety of voltage environments.
- Schmitt-Trigger Inputs: Provides hysteresis to improve noise immunity and reduce spurious switching.
- Temperature Compensated: Ensures clean, jitter-free output signals even with slow input ramps.
- Balanced CMOS Push-Pull Outputs: Capable of sinking and sourcing similar currents, minimizing output ringing.
- Input Voltage Tolerance: Inputs can accept voltages up to 5.5V, making it suitable for voltage translation.
- Low Drive and Slow Edge Rates: Minimizes overshoot and undershoot on the outputs, ideal for bus interface applications.
- Clamp Diode Structure: Includes positive and negative clamping diodes to protect against voltage spikes.
Applications
- Synchronize Inverted Clock Inputs: Useful in timing and clock signal applications where synchronization is crucial.
- Debounce Switches: Helps in eliminating noise from mechanical switches, ensuring reliable digital signals.
- Invert Digital Signals: Can be used in various digital logic circuits where signal inversion is required.
- Bus Interface Applications: Ideal for applications where output ringing is a concern, such as in D-Type flip-flops and counters.
Q & A
- What is the operating voltage range of the SN74AC14NSR?
The SN74AC14NSR operates over a voltage range of 2V to 6V.
- What is the purpose of the Schmitt-trigger inputs in the SN74AC14NSR?
The Schmitt-trigger inputs provide hysteresis to improve noise immunity and reduce spurious switching due to noise or slow input transitions.
- What are the propagation delay times for the SN74AC14NSR?
The propagation delay times (tPLH and tPHL) are typically around 5ns, with a maximum of 10ns and 9.5ns respectively at VCC = 5V.
- Can the inputs of the SN74AC14NSR handle voltages higher than VCC?
Yes, the inputs can handle voltages up to 5.5V, making it suitable for voltage translation applications.
- What is the thermal resistance of the SOP package for the SN74AC14NSR?
The junction-to-ambient thermal resistance (RθJA) for the SOP package is approximately 92.4°C/W.
- How many independent inverting buffers does the SN74AC14NSR contain?
The SN74AC14NSR contains six independent inverting buffers.
- What is the maximum output current per output pin for the SN74AC14NSR?
The maximum output current per output pin should not exceed 35 mA, with a total limit of 70 mA for the entire device.
- Can the SN74AC14NSR be used in high-temperature environments?
The SN74AC14NSR can operate in temperatures ranging from -40°C to 85°C.
- What are some common applications of the SN74AC14NSR?
Common applications include synchronizing inverted clock inputs, debouncing switches, inverting digital signals, and various bus interface applications.
- How should unused push-pull CMOS outputs be handled?
Unused push-pull CMOS outputs must be left disconnected to prevent any potential damage or malfunction.
