Overview
The SN74HCT541PWRE4, produced by Texas Instruments, is an octal buffer and line driver with 3-state outputs. This device is designed to offer high performance and ease of use in various digital circuit applications. It is part of the ’HCT series, which is compatible with TTL (Transistor-Transistor Logic) voltage levels, making it versatile for interfacing with different logic families.
The SN74HCT541PWRE4 features a unique pinout where inputs and outputs are on opposite sides of the package, greatly facilitating printed circuit board (PCB) layout. This arrangement simplifies the design and assembly process, reducing potential errors and improving overall system reliability.
Key Specifications
| Parameter | Unit | Min | Max | |
|---|---|---|---|---|
| Supply Voltage (VCC) | V | 4.5 | 5 | 5.5 |
| High-Level Input Voltage (VIH) | V | 2 | 2 | |
| Low-Level Input Voltage (VIL) | V | 0.8 | 0.8 | |
| Output Voltage (VOH) @ IOH = -20 µA | V | 4.4 | 4.499 | 4.4 |
| Output Voltage (VOL) @ IOL = 20 µA | V | 0.001 | 0.1 | 0.1 |
| Propagation Delay (tpd) @ VCC = 5 V | ns | 12 | 21 | |
| Output Enable Time (ten) @ VCC = 5 V | ns | 19 | 27 | |
| Output Disable Time (tdis) @ VCC = 5 V | ns | 18 | 27 | |
| Operating Free-Air Temperature (TA) | °C | -40 | 85 | |
| Junction-to-Ambient Thermal Resistance (RθJA) | °C/W | 131.8 |
Key Features
- Operating voltage range of 4.5 V to 5.5 V, making it compatible with TTL logic levels.
- High-current 3-state outputs that can interface directly with system bus or drive up to 15 LSTTL loads.
- Low power consumption with a maximum ICC of 80 µA.
- Fast propagation delay of 12 ns at VCC = 5 V.
- ±6-mA output drive at 5 V.
- Low input current of 1 µA max.
- TTL-voltage compatible inputs.
- Data flow-through pinout with inputs and outputs on opposite sides of the package, facilitating PCB layout.
Applications
- Buffering and driving signals in digital systems.
- Interfacing between different logic families.
- Driving long cables or lines in digital circuits.
- Implementing 3-state logic in various digital designs.
- Use in microprocessor and microcontroller systems for signal buffering and driving.
Q & A
- What is the operating voltage range of the SN74HCT541PWRE4?
The operating voltage range is from 4.5 V to 5.5 V.
- What is the maximum propagation delay of the SN74HCT541PWRE4 at VCC = 5 V?
The maximum propagation delay is 21 ns.
- How many LSTTL loads can the SN74HCT541PWRE4 drive?
The device can drive up to 15 LSTTL loads.
- What is the typical power consumption of the SN74HCT541PWRE4?
The typical power consumption is 80 µA.
- What is the junction-to-ambient thermal resistance of the TSSOP package?
The junction-to-ambient thermal resistance is 131.8 °C/W.
- What is the purpose of the 3-state outputs in the SN74HCT541PWRE4?
The 3-state outputs allow the device to be in a high-impedance state when either output-enable input is high, which is useful for bus interfacing and reducing power consumption.
- Why is the pinout of the SN74HCT541PWRE4 designed with inputs and outputs on opposite sides?
This design facilitates printed circuit board layout by simplifying the routing of signals.
- What are the typical output enable and disable times for the SN74HCT541PWRE4 at VCC = 5 V?
The typical output enable time is 19 ns, and the typical output disable time is 18 ns.
- Is the SN74HCT541PWRE4 compatible with TTL logic levels?
- What is the maximum continuous output current of the SN74HCT541PWRE4?
The maximum continuous output current is ±35 mA.
