STMicroelectronics 74LCX125MTR Quad Buffer/Line Driver

The 74LCX125MTR from STMicroelectronics is a low-voltage CMOS quad buffer/line driver designed to operate with a 3.3V power supply while maintaining 5V tolerant inputs. This integrated circuit is part of the LCX family, which is known for providing high-speed operation while maintaining CMOS low power dissipation.

Each buffer of the 74LCX125MTR has a separate output-enable (OE) input which must be held high to enable the output. When OE is low, the output is in a high-impedance state, allowing for bidirectional operation or connection to a bus without conflict. This feature makes the 74LCX125MTR ideal for interfacing with bus lines in a system, providing additional drive capability or buffering to ensure signal integrity.

The device is fabricated with an advanced CMOS technology to achieve high-speed operation while maintaining low static power dissipation. The inputs can tolerate voltages up to 5V, regardless of the voltage level of the supply, making this buffer compatible with mixed-voltage systems and enabling a smooth transition from 5V to 3.3V systems without the need for level shifting.

Key features of the 74LCX125MTR include:

• Power supply operating range of 2.0V to 3.6V
• 5V tolerant inputs for interfacing with 5V logic levels
• High impedance output state controlled by OE inputs
• Low quiescent current consumption
• High-speed operation: t<sub>PD = 4.0ns (max) at V<sub>CC = 3.3V
• Power-down high-impedance inputs and outputs
• Supports live insertion and withdrawal (partial power-down)
• Lead-free, RoHS-compliant, and 100% tested for quiescent current at 20V
• Offered in TSSOP14 package for surface mount technology (SMT)

The 74LCX125MTR is suitable for a wide range of applications, including memory address driving, clock driving, and bus-oriented systems where it provides a high degree of flexibility. Its robustness, speed, and power efficiency make it an excellent choice for modern electronic systems that require reliable logic buffering and level translation.