Overview
The SN74AHCT540DWR is an octal buffer/driver with 3-state outputs, manufactured by Texas Instruments. This device is designed to drive bus lines or buffer memory address registers, making it ideal for various digital logic applications. It features inputs and outputs on opposite sides of the package, which facilitates printed circuit board layout. The device operates within a supply voltage range of 4.5V to 5.5V and is compatible with TTL-voltage inputs.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 4.5 | 5.5 | |
| VIH (High-level Input Voltage) | V | 2 | ||
| VIL (Low-level Input Voltage) | V | 0.8 | ||
| IOH (High-level Output Current) | mA | -8 | ||
| IOL (Low-level Output Current) | mA | 8 | 8 | |
| Δt/Δv (Input Transition Rise or Fall Rate) | ns/V | 20 | 20 | |
| TA (Operating Free-Air Temperature) | °C | -55 | 125 | |
| tPLH (Propagation Delay Time, A to Y) | ns | 1 | 4.0 | 7.5 |
| tPHL (Propagation Delay Time, A to Y) | ns | 1 | 4.0 | 7.5 |
Key Features
- Inputs are TTL-voltage compatible.
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds JESD 22: 2000-V human-body model, 200-V machine model, and 1000-V charged-device model.
- 3-state control gate with active-low inputs.
- Outputs provide inverted data when not in the high-impedance state.
Applications
The SN74AHCT540DWR is suitable for driving bus lines or buffering memory address registers. Its design makes it particularly useful in digital logic circuits where signal buffering and isolation are necessary. It is also beneficial in applications requiring TTL-compatible inputs and 3-state output control.
Q & A
- What is the operating voltage range of the SN74AHCT540DWR?
The operating voltage range is 4.5V to 5.5V. - What type of input compatibility does the SN74AHCT540DWR have?
The device has TTL-voltage compatible inputs. - What is the maximum high-level output current of the SN74AHCT540DWR?
The maximum high-level output current is -8 mA. - What is the maximum low-level output current of the SN74AHCT540DWR?
The maximum low-level output current is 8 mA. - What is the operating temperature range of the SN74AHCT540DWR?
The operating temperature range is -55°C to 125°C. - What type of ESD protection does the SN74AHCT540DWR have?
The device has ESD protection exceeding JESD 22: 2000-V human-body model, 200-V machine model, and 1000-V charged-device model. - How many buffers/drivers are included in the SN74AHCT540DWR?
The device includes eight buffers/drivers. - What is the purpose of the 3-state control gate in the SN74AHCT540DWR?
The 3-state control gate is used to control the output state, allowing the outputs to be in a high-impedance state when either output-enable input is high. - What package types are available for the SN74AHCT540DWR?
The device is available in a SOIC (DW) package with 20 pins. - How should unused inputs be handled to ensure proper device operation?
All unused inputs must be held at VCC or GND to ensure proper device operation.
