Overview
The SN74ALS540NSR is an octal buffer and line driver produced by Texas Instruments. This component is designed to offer the performance of the popular SN54ALS240A/SN74ALS240A series, with the added benefit of a pinout that places inputs and outputs on opposite sides of the package. This arrangement significantly simplifies printed circuit board layout. The device features 3-state outputs, which can drive bus lines or buffer memory address registers, and it provides inverted data at the outputs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOP (NS) | - |
| Pins | 20 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage (VCC) | 4.5 to 5.5 | V |
| Nominal Voltage | 5 | V |
| Output Drive (IOL/IOH) | -15/24 mA | mA |
| Propagation Delay (tpd) | 12 ns | ns |
| Maximum Frequency | 75 MHz | MHz |
| ICC @ Nom Voltage (Max) | 0.022 mA | mA |
Key Features
- 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
- pnp Inputs Reduce dc Loading
- Data Flowthrough Pinout (All Inputs on Opposite Side From Outputs)
- The 3-state control gate is a 2-input NOR gate, allowing all eight outputs to be in the high-impedance state if either output-enable input is high
- Provides inverted data at the outputs (contrary to the ALS541 which provides true data)
Applications
The SN74ALS540NSR is suitable for various applications where high-performance buffering and line driving are required. These include:
- Driving bus lines in digital systems
- Buffering memory address registers
- General-purpose buffering and line driving in digital circuits
Q & A
- What is the package type of the SN74ALS540NSR?
The package type is SOP (NS) with 20 pins.
- What is the operating temperature range of the SN74ALS540NSR?
The operating temperature range is from 0 to 70°C.
- What is the supply voltage range for the SN74ALS540NSR?
The supply voltage range is from 4.5 to 5.5 V.
- What is the maximum output drive current for the SN74ALS540NSR?
The maximum output drive current is -15/24 mA.
- What is the propagation delay of the SN74ALS540NSR?
The propagation delay is 12 ns.
- Does the SN74ALS540NSR provide true or inverted data at the outputs?
The SN74ALS540NSR provides inverted data at the outputs.
- What is the purpose of the 3-state control gate in the SN74ALS540NSR?
The 3-state control gate is a 2-input NOR gate that allows all eight outputs to be in the high-impedance state if either output-enable input is high.
- How does the pinout of the SN74ALS540NSR facilitate PCB layout?
The pinout places inputs and outputs on opposite sides of the package, greatly simplifying printed circuit board layout.
- What is the maximum frequency at which the SN74ALS540NSR can operate?
The maximum frequency is 75 MHz.
- Is the SN74ALS540NSR recommended for new designs?
Yes, the SN74ALS540NSR is active and recommended for new designs.
