Overview
The SN74HCT541DWR, produced by Texas Instruments, is an octal buffer and line driver with 3-state outputs. This device is designed to offer high performance and facilitate easy printed circuit board layout due to its unique pinout, where inputs and outputs are located on opposite sides of the package. It is compatible with the popular ’HC240 series devices and is suitable for a wide range of digital logic applications.
Key Specifications
| Parameter | Unit | Min | Typ | 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) at IOH = -20 µA | V | 4.4 | 4.499 | 4.4 |
| Output Voltage (VOL) at IOL = 20 µA | V | 0.001 | 0.1 | 0.1 |
| Propagation Delay (tpd) at VCC = 5 V, CL = 50 pF | ns | 12 | 21 | |
| Output Enable Time (ten) at VCC = 5 V, CL = 50 pF | ns | 19 | 27 | |
| Output Disable Time (tdis) at VCC = 5 V, CL = 50 pF | ns | 18 | 27 | |
| Input Current (II) at VI = VCC or 0 | nA | ±0.1 | ±1000 | |
| Supply Current (ICC) at VI = VCC or 0, IO = 0 | µA | 8 | 80 | |
| Junction-to-Ambient Thermal Resistance (RθJA) | °C/W | 109.1 |
Key Features
- Operating voltage range of 4.5 V to 5.5 V
- 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 supply current (ICC) of 80 µA
- Typical propagation delay (tpd) of 12 ns at VCC = 5 V and CL = 50 pF
- ±6-mA output drive at 5 V
- Low input current of 1 µA max
- Inputs are TTL-voltage compatible
- Data flow-through pinout with inputs and outputs on opposite sides of the package, facilitating PCB layout
Applications
- Buffering and driving signals in digital logic circuits
- Interface between different logic families
- Driving long cables or lines in digital systems
- Implementing 3-state logic functions in various digital applications
- Use in microprocessor and microcontroller systems for signal buffering and driving
Q & A
- What is the operating voltage range of the SN74HCT541DWR?
The operating voltage range is from 4.5 V to 5.5 V.
- What is the maximum number of LSTTL loads that the SN74HCT541DWR can drive?
The device can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HCT541DWR at VCC = 5 V and CL = 50 pF?
The typical propagation delay is 12 ns.
- How much current does the SN74HCT541DWR consume at maximum?
The maximum supply current (ICC) is 80 µA.
- What is the input current of the SN74HCT541DWR?
The input current is 1 µA max.
- Are the inputs of the SN74HCT541DWR TTL-voltage compatible?
- What is the benefit of the pinout arrangement in the SN74HCT541DWR?
The pinout arrangement with inputs and outputs on opposite sides of the package greatly facilitates printed circuit board layout.
- How should unused inputs of the SN74HCT541DWR be handled?
Unused inputs must be held at VCC or GND to ensure proper device operation.
- What type of bypass capacitor is recommended for the power supply of the SN74HCT541DWR?
A 0.1-μF capacitor is recommended, and it is acceptable to parallel multiple bypass caps to reject different frequencies of noise.
- What is the junction-to-ambient thermal resistance of the SN74HCT541DWR in the SOIC package?
The junction-to-ambient thermal resistance (RθJA) is 109.1 °C/W.
