Overview
The SN74LVC125AD, produced by Texas Instruments, is a quadruple bus buffer gate designed for operation within a voltage range of 1.65V to 3.6V. This device features independent line drivers with 3-state outputs, making it versatile for various digital logic applications. Each output can be disabled when the associated output-enable (OE) input is high, ensuring high-impedance states during power-up or power-down phases. The SN74LVC125AD is particularly useful in mixed 3.3V/5V system environments due to its ability to accept input voltages up to 5.5V.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage Range | 1.65V to 3.6V |
| Operating Temperature Range | –40°C to 85°C and –40°C to 125°C |
| Input Voltage Range | Up to 5.5V |
| Maximum Propagation Delay (tpd) at 3.3V | 4.8ns |
| Output Ground Bounce (VOLP) at VCC = 3.3V, TA = 25°C | < 0.8V |
| Output VOH Undershoot (VOHV) at VCC = 3.3V, TA = 25°C | > 2V |
| Latch-up Performance | Exceeds 250mA per JESD 17 |
| Package Type | SOIC (D) 14-pin |
| Package Quantity | Carrier 50 (TUBE), Carrier 2,500 (LARGE T&R) |
Key Features
- 3-State outputs
- Separate OE (output-enable) for all 4 buffers
- Operates from 1.65V to 3.6V
- Inputs accept voltages up to 5.5V
- High-speed operation with a maximum propagation delay of 4.8ns at 3.3V
- Low output ground bounce and VOH undershoot
- Latch-up performance exceeds 250mA per JESD 17
- Suitable for use in mixed 3.3V/5V system environments
Applications
The SN74LVC125AD is suitable for a variety of digital logic applications, particularly in systems that require voltage translation between 3.3V and 5V devices. It is commonly used in:
- Mixed voltage system environments
- High-speed digital circuits
- Buffering and driving signals in digital systems
- Applications requiring low power consumption and high reliability
Q & A
- What is the operating voltage range of the SN74LVC125AD?
The SN74LVC125AD operates within a voltage range of 1.65V to 3.6V. - What is the maximum propagation delay at 3.3V?
The maximum propagation delay at 3.3V is 4.8ns. - Can the SN74LVC125AD accept input voltages higher than its operating voltage?
Yes, the SN74LVC125AD can accept input voltages up to 5.5V. - What is the purpose of the output-enable (OE) input?
The output-enable (OE) input is used to disable the output, placing it in a high-impedance state when high. - What is the latch-up performance of the SN74LVC125AD?
The latch-up performance exceeds 250mA per JESD 17. - In what types of systems is the SN74LVC125AD commonly used?
The SN74LVC125AD is commonly used in mixed 3.3V/5V system environments and high-speed digital circuits. - What is the package type and pin count of the SN74LVC125AD?
The SN74LVC125AD comes in a SOIC (D) package with 14 pins. - How should the OE input be managed during power-up or power-down?
The OE input should be tied to VCC through a pullup resistor to ensure the high-impedance state during power-up or power-down. - What are the typical output ground bounce and VOH undershoot values?
The typical output ground bounce (VOLP) is less than 0.8V, and the typical VOH undershoot (VOHV) is greater than 2V at VCC = 3.3V and TA = 25°C. - What is the operating temperature range of the SN74LVC125AD?
The operating temperature range is from –40°C to 85°C and –40°C to 125°C.
