STMicroelectronics M74HC126TTR Quad Buffer/Line Driver

The M74HC126TTR from STMicroelectronics is a high-speed CMOS Quad Buffer/Line Driver designed to interface with standard logic families. This integrated circuit is fabricated with silicon gate C2MOS technology, ensuring robust performance and high noise immunity. The device is particularly suitable for driving bus lines or buffer memory address registers due to its high current output capability and symmetrical output impedance.

The M74HC126TTR features four independent buffer/line drivers with 3-state outputs, each capable of driving highly capacitive or relatively low-impedance loads. The 3-state control gate operates as a two-input AND gate with active-low inputs, which allows the user to put the output into a high-impedance state, effectively disconnecting the output from the circuit. This is especially useful in bus-oriented applications where multiple drivers can share the same line without interfering with each other when their outputs are in the high-impedance state.

Each buffer is designed to operate over a broad voltage range of 2V to 6V and provides a balanced propagation delay and transition times, making the device suitable for use in mixed 5V and 3.3V applications. The inputs are high-speed and can be driven from either 3.3V or 5V devices, which means that the device has level translation capabilities making it ideal for multi-voltage systems.

The M74HC126TTR comes in a TSSOP14 package, which is compact and suitable for surface-mount technology (SMT), thereby catering to modern high-density circuit board designs. Its low quiescent current ensures that the device has a minimal impact on the power consumption of the system, making it suitable for battery-operated and power-sensitive applications.

Key features of the M74HC126TTR include:

• High-speed: typical t<sub>PD 9ns at V<sub>CC = 5V
• Low power dissipation: I<sub>CC = 1μA (max.) at T<sub>A = 25°C
• High noise immunity: V<sub>NIH and V<sub>NIL = 28% V<sub>CC (minimum)
• Output drive capability: 15 LSTTL loads
• Symmetrical output impedance: |I<sub>OH| = I<sub>OL = 6mA (min.)
• Wide operating voltage range: V<sub>CC (operational) = 2V to 6V
• Pin and function compatible with 74 series
• ESD performance: HBM > 1KV; MM > 200V
• Lead-free, halogen-free, and RoHS compliant

Overall, the M74HC126TTR is a versatile and reliable component for any design requiring high-speed buffering and driving capabilities with the added benefit of a 3-state output to facilitate bus management.