Overview
The SN74HC540N is an octal buffer and line driver integrated circuit produced by Texas Instruments. It is part of the HC series, known for its high performance and versatility. This device features a wide operating voltage range of 2 V to 6 V, making it suitable for various applications. The SN74HC540N has a data flow-through pinout, where all inputs are on one side and all outputs are on the opposite side, which greatly facilitates printed circuit board layout. The device provides inverted data at the outputs and includes 3-state outputs controlled by a 2-input NOR gate, allowing all eight outputs to be in a high-impedance state when either output-enable input is high.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | - | - | V |
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | - | - | V |
| Input Transition Rise/Fall Time | 1000 (VCC=2V), 500 (VCC=4.5V), 400 (VCC=6V) | - | - | ns |
| Output Voltage (VO) | 0 | - | VCC | V |
| Operating Free-Air Temperature (TA) | -40 | - | 85 | °C |
| Package Type | PDIP-20 | - | - | - |
| Number of Channels | 8 | - | - | - |
Key Features
- Wide operating voltage range of 2 V to 6 V
- High-current 3-state outputs drive bus lines directly or up to 15 LSTTL loads
- Low power consumption, 80-μA maximum ICC
- Typical propagation delay time (tpd) of 8 ns
- ±6-mA output drive at 5 V
- Low input current of 1 μA maximum
- Data flow-through pinout (all inputs on opposite side from outputs)
- 3-state control gate is a 2-input NOR
- Provides inverted data at the outputs
Applications
- LEDs
- Servers
- PCs and Notebooks
- Wearable Health and Wellness Devices
- Electronic Points of Sale
Q & A
- What is the operating voltage range of the SN74HC540N?
The operating voltage range is from 2 V to 6 V.
- How many channels does the SN74HC540N have?
The SN74HC540N has 8 channels.
- What is the typical propagation delay time (tpd) of the SN74HC540N?
The typical propagation delay time is 8 ns.
- What is the output drive capability at 5 V?
The output drive capability is ±6 mA at 5 V.
- What is the input current of the SN74HC540N?
The input current is 1 μA maximum.
- How are the inputs and outputs arranged on the SN74HC540N?
The inputs and outputs are arranged on opposite sides of the package, facilitating printed circuit board layout.
- What type of control gate does the SN74HC540N use for its 3-state outputs?
The 3-state control gate is a 2-input NOR gate.
- What happens to the outputs when either output-enable input is high?
All eight outputs are in the high-impedance state when either output-enable input is high.
- Does the SN74HC540N provide inverted or true data at the outputs?
The SN74HC540N provides inverted data at the outputs.
- What is the operating temperature range of the SN74HC540N?
The operating temperature range is from -40°C to 85°C.
