Overview
The SN74AHCT125DRG4 is a quadruple bus buffer gate produced by Texas Instruments. This device features four independent line drivers with 3-state outputs, making it highly versatile for various digital signal management applications. Each buffer has its own output enable pin, allowing for individual control of each output. This component is part of the AHCT series, which is known for its compatibility with TTL (Transistor-Transistor Logic) voltage levels and its high-speed performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | 5.5 | V | |
| VIH High-Level Input Voltage | 2 | 2 | V | |
| VIL Low-Level Input Voltage | 0.8 | 0.8 | V | |
| VOH High-Level Output Voltage (IOH = -50 µA) | 4.4 | 4.5 | 4.5 | V |
| VOL Low-Level Output Voltage (IOL = 50 µA) | 0 | 0.1 | V | |
| TA Operating Free-Air Temperature | -40 | 85 | °C | |
| tPLH Propagation Delay Time (A to Y) | 3.8 | 5.5 | 6.5 | ns |
| tPHL Propagation Delay Time (A to Y) | 3.8 | 5.5 | 6.5 | ns |
| θJA Package Thermal Impedance | 87.1 | °C/W |
Key Features
- Inputs are TTL-voltage compatible, ensuring compatibility with a wide range of digital systems.
- Each buffer has its own output enable pin, allowing for individual control of each output.
- 3-state outputs, which can be set to high impedance when the output enable pin is high.
- High-speed performance with propagation delay times as low as 3.8 ns.
- Low power consumption, suitable for battery-powered and low-power applications.
- Multiple package options, including SOIC, SSOP, TVSOP, PDIP, SOP, TSSOP, VQFN, and WQFN.
Applications
- Enable or disable digital signals in various digital circuits.
- Control indicator LEDs or other output devices.
- Debounce switches to eliminate noise and ensure stable input signals.
- Isolate or multiplex data lines in microcontroller or other digital systems.
- Buffer and drive long signal lines to maintain signal integrity.
Q & A
- What is the primary function of the SN74AHCT125DRG4?
The primary function of the SN74AHCT125DRG4 is to act as a quadruple bus buffer gate, providing four independent line drivers with 3-state outputs.
- What are the typical operating voltage ranges for this device?
The typical operating voltage range for the SN74AHCT125DRG4 is 4.5V to 5.5V.
- How do the output enable pins work on this device?
Each output enable pin controls the corresponding buffer. When the output enable pin is low, the input is passed to the output. When it is high, the output is set to a high impedance state.
- What are some common applications for this device?
Common applications include enabling or disabling digital signals, controlling indicator LEDs, debouncing switches, and isolating or multiplexing data lines.
- What is the maximum propagation delay time for this device?
The maximum propagation delay time (tPLH and tPHL) is approximately 6.5 ns for a load capacitance of 15 pF.
- What is the thermal impedance of the VQFN package?
The thermal impedance (θJA) for the VQFN package is approximately 87.1 °C/W.
- Can this device drive capacitive loads?
Yes, the SN74AHCT125DRG4 can drive loads with a total capacitance less than or equal to 50 pF while meeting all data sheet specifications.
- What are the absolute maximum ratings for input voltage?
The absolute maximum ratings for input voltage are from -0.5V to 7V.
- How many different package options are available for this device?
The device is available in several package options including SOIC, SSOP, TVSOP, PDIP, SOP, TSSOP, VQFN, and WQFN.
- What is the recommended operating temperature range?
The recommended operating temperature range is from -40°C to 85°C.
