Overview
The SN74AHC126DR, produced by Texas Instruments, is a quadruple bus buffer gate with 3-state outputs. This device is part of the AHC (Advanced High-Speed CMOS) family and is designed to operate over a wide voltage range from 2V to 5.5V. It features four independent buffers, each performing the Boolean function Y = A in positive logic. The device is suitable for various digital logic applications requiring low delay and high impedance states.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5.5 | V | |
| VIH High-Level Input Voltage (VCC = 5.5V) | 3.85 | V | ||
| VIL Low-Level Input Voltage (VCC = 5.5V) | 1.65 | V | ||
| IOH High-Level Output Current (VCC = 5V) | -8 | mA | ||
| IOL Low-Level Output Current (VCC = 5V) | 8 | mA | ||
| tPLH Propagation Delay (A to Y) at VCC = 5V, CL = 15pF | 3.8 | 5.5 | ns | |
| tPHL Propagation Delay (A to Y) at VCC = 5V, CL = 15pF | 3.8 | 5.5 | ns | |
| TA Operating Free-Air Temperature | -40 | 85 | °C |
Key Features
- Operating range: 2V to 5.5V VCC
- Low propagation delay: 3.8 ns (typical with 5-V supply)
- 3-state outputs for high impedance state during power-up or power-down
- Balanced CMOS 3-state outputs
- Latch-up performance exceeds 250mA per JESD 17
- Input and output clamp diodes to protect against voltage spikes
- Available in TSSOP and WQFN packages
Applications
- Driving indicator LEDs
- Driving transmission lines with logic signals
- Enabling or disabling digital signals
- General-purpose buffering in digital circuits
Q & A
- What is the operating voltage range of the SN74AHC126DR?
The operating voltage range is from 2V to 5.5V.
- What is the typical propagation delay of the SN74AHC126DR at VCC = 5V?
The typical propagation delay is 3.8 ns.
- What is the purpose of the 3-state outputs in the SN74AHC126DR?
The 3-state outputs allow for high impedance states during power-up or power-down, enabling or disabling the output.
- What are the package options available for the SN74AHC126DR?
The device is available in TSSOP and WQFN packages.
- How should unused inputs be handled in the SN74AHC126DR?
Unused inputs must be held at VCC or GND to ensure proper device operation.
- What is the maximum continuous output current for the SN74AHC126DR?
The maximum continuous output current is ±25 mA.
- What is the latch-up performance of the SN74AHC126DR?
The latch-up performance exceeds 250mA per JESD 17.
- What is the operating free-air temperature range for the SN74AHC126DR?
The operating free-air temperature range is from -40°C to 85°C.
- How do the input and output clamp diodes protect the device?
The input and output clamp diodes protect against voltage spikes by clamping the voltage to safe levels.
- What are some common applications of the SN74AHC126DR?
Common applications include driving indicator LEDs, driving transmission lines with logic signals, and enabling or disabling digital signals.
