Overview
The SN74HC540PWR is an octal buffer and line driver produced by Texas Instruments. This device is part of the popular HC540 series and is known for its high-performance characteristics and versatile pinout. The SN74HC540PWR features a wide operating voltage range of 2 V to 6 V, making it suitable for a variety of applications. It provides high-current 3-state outputs, which can drive bus lines directly or up to 15 LSTTL loads. The device is available in a TSSOP (Thin Shrink Small Outline Package) with 20 pins, facilitating efficient printed circuit board layout due to its data flow-through pinout.
Key Specifications
| Parameter | Unit | Min | Max | |
|---|---|---|---|---|
| Supply Voltage (VCC) | V | 2 | 5 | 6 |
| High-Level Input Voltage (VIH) | V | 1.5 (VCC=2V) | - | 4.2 (VCC=6V) |
| Low-Level Input Voltage (VIL) | V | 0.5 (VCC=2V) | - | 1.8 (VCC=6V) |
| Output Voltage (VO) | V | 0 | - | VCC |
| Input Transition Rise/Fall Time | ns | 400 (VCC=6V) | - | 1000 (VCC=2V) |
| Propagation Delay Time (tpd) | ns | 8 (VCC=6V) | - | 149 (VCC=2V) |
| Output Drive Current | mA | - | - | ±6 |
| Power Dissipation Capacitance per Buffer/Driver | pF | - | 35 | - |
| Junction-to-Ambient Thermal Resistance | °C/W | - | - | 131.8 |
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 time of 8 ns at 5 V
- ±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
Applications
The SN74HC540PWR is suitable for various applications requiring high-performance buffering and line driving. These include:
- Bus drivers in microprocessor and memory systems
- Line drivers for data transmission
- Buffering in digital logic circuits
- Applications requiring 3-state outputs for high-impedance control
Q & A
- What is the operating voltage range of the SN74HC540PWR?
The operating voltage range is from 2 V to 6 V. - What is the maximum output drive current of the SN74HC540PWR?
The maximum output drive current is ±6 mA at 5 V. - What is the typical propagation delay time of the SN74HC540PWR?
The typical propagation delay time is 8 ns at 5 V. - What is the maximum power consumption of the SN74HC540PWR?
The maximum power consumption is 80 μA. - What is the package type of the SN74HC540PWR?
The package type is TSSOP (Thin Shrink Small Outline Package) with 20 pins. - How does the 3-state control gate work in the SN74HC540PWR?
The 3-state control gate is a 2-input NOR. If either output-enable (OE1 or OE2) input is high, all eight outputs are in the high-impedance state. - What is the thermal resistance of the SN74HC540PWR in the TSSOP package?
The junction-to-ambient thermal resistance is 131.8 °C/W. - Can the SN74HC540PWR drive LSTTL loads?
Yes, it can drive up to 15 LSTTL loads. - What is the input current of the SN74HC540PWR?
The maximum input current is 1 μA. - Is the SN74HC540PWR RoHS compliant?
Yes, the SN74HC540PWR is RoHS compliant.
