Overview
The SN74HC540NS is an octal buffer and line driver produced by Texas Instruments. This component is part of the popular HC240 series and is designed to provide high-performance buffering and line driving capabilities. The device features a pinout with inputs and outputs on opposite sides of the package, which significantly simplifies printed circuit board (PCB) layout. The SN74HC540NS is suitable for a wide range of applications requiring reliable and efficient signal buffering and driving.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage) | 2 | 5 | 6 | V |
| VIH (High-level Input Voltage) at VCC = 2 V | 1.5 | 1.5 | 1.5 | V |
| VIH (High-level Input Voltage) at VCC = 4.5 V | 3.15 | 3.15 | 3.15 | V |
| VIH (High-level Input Voltage) at VCC = 6 V | 4.2 | 4.2 | 4.2 | V |
| VIL (Low-level Input Voltage) at VCC = 2 V | 0.5 | 0.5 | 0.5 | V |
| VIL (Low-level Input Voltage) at VCC = 4.5 V | 1.35 | 1.35 | 1.35 | V |
| VIL (Low-level Input Voltage) at VCC = 6 V | 1.8 | 1.8 | 1.8 | V |
| IOH (Output Current High) | -20 | μA | ||
| tpd (Propagation Delay Time) | 8 | ns | ||
| Δt/Δv (Input Transition Rise/Fall Time) at VCC = 2 V | 1000 | 1000 | 1000 | ns |
| Δt/Δv (Input Transition Rise/Fall Time) at VCC = 4.5 V | 500 | 500 | 500 | ns |
| Δt/Δv (Input Transition Rise/Fall Time) at VCC = 6 V | 400 | 400 | 400 | ns |
| TA (Operating Free-Air Temperature) | -40 | 85 | °C | |
| Package Type | SOIC-20 (NS) |
Key Features
- Wide Operating Voltage Range: The device operates over a voltage range of 2 V to 6 V, making it versatile for various applications.
- High-Current 3-State Outputs: Capable of driving bus lines directly or up to 15 LSTTL loads, with ±6-mA output drive at 5 V.
- Low Power Consumption: Maximum ICC of 80 μA, contributing to low power consumption.
- Fast Propagation Delay: Typical propagation delay time of 8 ns.
- Low Input Current: Maximum input current of 1 μA.
- Data Flow-Through Pinout: Inputs and outputs are on opposite sides of the package, facilitating PCB layout.
- 3-State Control Gate: A 2-input NOR gate controls the output-enable inputs (OE1 and OE2), allowing all eight outputs to be in the high-impedance state if either input is high.
- Inverted Data at Outputs: The device provides inverted data at the outputs.
- RoHS Compliant: Meets RoHS standards for environmental sustainability.
Applications
- Printed Circuit Boards (PCBs): The pinout arrangement simplifies PCB layout and design.
- Bus Systems: Suitable for driving bus lines directly or multiple LSTTL loads.
- Digital Logic Circuits: Used in various digital logic circuits requiring buffering and line driving.
- Embedded Systems: Ideal for use in embedded systems due to its low power consumption and high performance.
- Industrial Control Systems: Can be used in industrial control systems where reliable signal buffering is necessary.
Q & A
- What is the operating voltage range of the SN74HC540NS?
The operating voltage range is from 2 V to 6 V.
- What is the typical propagation delay time of the SN74HC540NS?
The typical propagation delay time is 8 ns.
- How many outputs does the SN74HC540NS have?
The device has eight outputs.
- What is the maximum output current of the SN74HC540NS at 5 V?
The maximum output current is ±6 mA at 5 V.
- What is the package type of the SN74HC540NS?
The package type is SOIC-20 (NS).
- Is the SN74HC540NS RoHS compliant?
- What is the operating temperature range of the SN74HC540NS?
The operating temperature range is from -40°C to 85°C.
- How does the 3-state control gate work in the SN74HC540NS?
The 3-state control gate is a 2-input NOR gate. If either output-enable input (OE1 or OE2) is high, all eight outputs are in the high-impedance state.
- Does the SN74HC540NS provide inverted data at the outputs?
- What are some common applications of the SN74HC540NS?
