STMicroelectronics 74LCX373M Octal Transparent Latch

The 74LCX373M from STMicroelectronics is a high-performance, octal transparent latch with 3-state outputs designed for 2V to 3.6V V<sub>CC operation. This integrated circuit is part of the LCX family, which provides robust low voltage solutions for today's mixed 3.3V/5V system environments.

Featuring a latch-enable (LE) and output-enable (OE) inputs, the device allows the user to control the transparency of the latch and the state of the outputs, which is particularly useful in bus-oriented applications. When LE is HIGH, the flip-flops appear transparent to the data, and when LE is taken LOW, the data that meets the setup-time requirements is latched. Data appears on the bus when the OE is LOW and is isolated from the bus when OE is HIGH.

The 74LCX373M has been designed with an optimized power and speed feature that significantly reduces power consumption when the device is in the quiet state. The 5V tolerant inputs and outputs enable the device to be used in mixed-voltage environments, and power-down protection is provided on all inputs and outputs, ensuring no excess current is drawn if the power supply is removed.

This device is suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working memory in a wide range of applications including personal computers, communication devices, and high-speed data processing systems. The 74LCX373M comes in a SOIC-20 package and is characterized for operation from -40°C to +85°C, ensuring reliability across diverse operating conditions.

Key features of the 74LCX373M include:

• Wide operating voltage range of 2V to 3.6V
• 5V tolerant inputs and outputs for interfacing with 5V logic
• High-speed low-power CMOS technology
• Power-down high impedance inputs and outputs
• Supports live insertion and withdrawal (partial power-down)
• ±24mA output drive at 3.0V
• Implements patented noise/EMI reduction circuitry
• Latch-up performance exceeds 500mA
• ESD performance: Human body model > 2000V, Machine model > 200V

With its robust feature set, the 74LCX373M is an excellent choice for designers looking for a reliable octal transparent latch compatible with low-voltage operation and mixed-voltage system designs.