SN74HC125 Quad Buffer Gate with 3-State Outputs – Texas Instruments
The SN74HC125 is a quad buffer gate IC that features 3-state outputs controlled via individual enable lines. Designed and manufactured by Texas Instruments, this device is optimized for applications that require controlled bus driving, signal isolation, and low power operation. It offers high-speed CMOS logic performance, enabling reliable signal distribution across multiple subsystems.
This component operates across a supply voltage range of 2V to 6V and is fully compatible with both TTL and CMOS logic levels. It is an excellent choice for designers working in embedded systems, computing platforms, and industrial control networks.
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Key Features and Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Logic Family | HC CMOS | – |
| Number of Buffers | 4 | – |
| Output Type | 3-State | – |
| Supply Voltage (Vcc) | 2 to 6 | V |
| Input Current | ??6 | ??a |
| Max Propagation Delay | 14 | ns @ 6V |
| Package | SOIC-14 | – |
Advantages Over Standard Alternatives
- Precision Control: Individual output enables allow precise control of signal routing, ideal for multiplexed systems.
- 3-State Outputs: Prevent bus contention, enabling clean transitions in multi-device environments.
- Compact Package: SOIC-14 format reduces board footprint without sacrificing performance.
- Versatile Voltage Support: Compatible with both 3.3V and 5V systems, simplifying multi-voltage board designs.
- Low Static Power Consumption: Makes it suitable for battery-powered and energy-conscious applications.
Electrical Characteristics Summary
| Feature | Description |
|---|---|
| High-Level Output Current (IOH) | -5.2 mA @ 4.5V |
| Low-Level Output Current (IOL) | 5.2 mA @ 4.5V |
| Operating Temp Range | -40??C to 85??C |
| Power Dissipation | Low static power (<10 ??A typical) |
| Logic Compatibility | TTL, CMOS |
Typical Applications
- Bus drivers for embedded systems
- Peripheral data routing in microcontroller platforms
- Level shifting and isolation in digital circuits
- Signal buffering for industrial control systems
- Memory-mapped I/O interface control
Frequently Asked Questions (FAQ)
What is the function of SN74HC125?
This IC provides four independent buffer gates with 3-state outputs and enable control, enabling efficient digital signal management across shared buses.
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Is the SN74HC125 compatible with 3.3V logic?
Yes, it operates across a wide voltage range (2V to 6V), ensuring reliable integration with both 3.3V and 5V logic systems.
What does a 3-state output mean in this context?
3-state outputs can be high, low, or high-impedance (disabled), allowing multiple devices to safely share a common line without interference.
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Can I use this IC for bus contention prevention?
Absolutely. The enable pins help avoid conflicts on shared data lines by putting unused outputs into a high-impedance state.
What makes this suitable for industrial automation?
The device’s robust voltage tolerance, noise immunity, and precise control features make it ideal for automation tasks requiring high signal integrity.
