Overview
The SN74HC125DR, manufactured by Texas Instruments, is a quad bus buffer gate with 3-state outputs. This integrated circuit is part of the 74HC logic family and is designed for digital logic applications. It is particularly useful in scenarios where signal buffering, level shifting, or bus driving is required. The device features four independent buffer gates, each with a 3-state output controlled by an output enable (nOE) input. This allows the outputs to be placed in a high-impedance state, making it suitable for shared bus applications. The SN74HC125DR is available in an SOIC-14 package, making it compatible with surface-mount technology (SMT) for compact PCB designs.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Logic Family | 74HC | - | - |
| Number of Channels | 4 | - | - |
| Output Type | 3-State | - | - |
| Supply Voltage | 2V to 6V | V | - |
| Operating Temperature | -40°C to +85°C | °C | - |
| Low-Level Output Current (IOL) | 7.8 | mA | - |
| High-Level Output Current (IOH) | 7.8 | mA | - |
| Propagation Delay | 17 | ns | @6V, 50pF |
| Package | SOIC-14 | - | - |
| Mounting Type | Surface Mount | - | - |
Key Features
- Quad independent buffer gates with 3-state outputs.
- Wide operating voltage range (2V to 6V).
- High-impedance state for bus sharing applications.
- Compatible with TTL and CMOS logic levels.
- Compact SOIC-14 package for space-efficient designs.
Applications
The SN74HC125DR is widely used in various applications, including:
- Bus Driving: Ideal for driving shared bus lines in multi-device systems.
- Signal Buffering: Enhances signal integrity by preventing signal degradation over long distances.
- Level Shifting: Facilitates communication between devices operating at different voltage levels.
- Logic Expansion: Provides additional logic gates for complex digital circuits.
- Industrial Automation: Used in control systems and sensor interfaces.
Q & A
1. What is the function of the SN74HC125DR?
The SN74HC125DR is a quad bus buffer gate with 3-state outputs, used for signal buffering, level shifting, and bus driving.
2. What is the operating voltage range of the SN74HC125DR?
The device operates within a voltage range of 2V to 6V.
3. What is the significance of the 3-state output?
The 3-state output allows the device to be placed in a high-impedance state, enabling shared bus applications without signal interference.
4. What package does the SN74HC125DR come in?
It is available in an SOIC-14 package.
5. What is the maximum operating temperature of the SN74HC125DR?
The device can operate in temperatures ranging from -40°C to +85°C.
6. Can the SN74HC125DR interface with both TTL and CMOS logic levels?
Yes, it is compatible with both TTL and CMOS logic levels.
7. What is the typical propagation delay of the SN74HC125DR?
The typical propagation delay is 17ns at 6V with a 50pF load.
8. What are the key applications of the SN74HC125DR?
Key applications include bus driving, signal buffering, level shifting, and logic expansion.
9. Is the SN74HC125DR suitable for surface-mount technology (SMT)?
Yes, the SOIC-14 package is designed for surface-mount applications.
10. What is the output current capability of the SN74HC125DR?
The device can source or sink up to 7.8mA of current.
