Overview
The SN74HC540DWR is a digital integrated circuit produced by Texas Instruments, designed as an octal buffer and line driver with 3-state outputs. This component is part of the HC family and is known for its wide operating voltage range and high-current drive capabilities. It features a pinout with inputs and outputs on opposite sides of the package, which simplifies printed circuit board layout. The device provides inverted data at the outputs and includes a 3-state control gate that can place all eight outputs in a high-impedance state when either output-enable input is high.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer | Texas Instruments | |
| Type of integrated circuit | Digital | |
| Kind of integrated circuit | Buffer, Inverting, Line Driver | |
| Number of channels | 8 | |
| Mounting | SMD | |
| Case | SO20 | |
| Kind of output | 3-state | |
| Family | HC | |
| Supply voltage | 2 to 6 V DC | V |
| Operating temperature range | −40°C to 85°C | °C |
| High-level input voltage (VCC = 6 V) | 4.2 V | V |
| Low-level input voltage (VCC = 6 V) | 1.8 V | V |
| Output drive at 5 V | ±6 mA | mA |
| Typical propagation delay (tpd) at 5 V | 10 to 20 ns | ns |
| Power dissipation capacitance per buffer/driver | 35 pF | pF |
Key Features
- Wide operating voltage range of 2 V to 6 V
- High-current 3-state outputs capable of driving bus lines directly or up to 15 LSTTL loads
- Low power consumption, with a maximum ICC of 80 μA
- Typical propagation delay of 8 ns
- ±6 mA output drive at 5 V
- Low input current of 1 μA maximum
- Data flow-through pinout with inputs and outputs on opposite sides of the package, facilitating PCB layout
- 3-state control gate with a 2-input NOR logic
Applications
The SN74HC540DWR is suitable for a variety of applications where high-current drive and 3-state output capabilities are required. These include:
- Bus drivers in digital systems
- Line drivers for communication interfaces
- Buffering and driving signals in microprocessor and microcontroller systems
- General-purpose digital logic circuits requiring high drive capabilities
Q & A
- What is the operating voltage range of the SN74HC540DWR?
The operating voltage range is from 2 V to 6 V DC.
- How many channels does the SN74HC540DWR have?
The SN74HC540DWR has 8 channels.
- What type of output does the SN74HC540DWR provide?
The SN74HC540DWR provides 3-state outputs.
- What is the typical propagation delay of the SN74HC540DWR at 5 V?
The typical propagation delay at 5 V is between 10 to 20 ns.
- How much current can the SN74HC540DWR drive at 5 V?
The SN74HC540DWR can drive up to ±6 mA at 5 V.
- What is the maximum power dissipation capacitance per buffer/driver?
The maximum power dissipation capacitance per buffer/driver is 35 pF.
- What is the operating temperature range of the SN74HC540DWR?
The operating temperature range is from −40°C to 85°C.
- What is the input current of the SN74HC540DWR?
The input current is a maximum of 1 μA.
- How does the 3-state control gate work on the SN74HC540DWR?
The 3-state control gate is a 2-input NOR logic. If either output-enable input is high, all eight outputs are in the high-impedance state.
- Is the SN74HC540DWR still in production?
No, the SN74HC540DWR has been discontinued by Texas Instruments.
