Low-Voltage Octal D-Type Latch with 5V Tolerant Inputs and Outputs: The onsemi MC74LCX373DTR2

In modern electronic systems, managing mixed-voltage environments is a common challenge. The onsemi MC74LCX373DTR2 addresses this need as a low-voltage octal D-type latch designed for seamless operation in such conditions. This integrated circuit is part of the LCX family, which is renowned for combining high performance with low power consumption, making it ideal for a wide range of applications from networking equipment to portable consumer electronics.

A key feature of this device is its 5V tolerant inputs and outputs. This capability allows the latch to safely interface with higher voltage components, such as 5V systems, even when it is operating at its own lower supply voltage, typically 2.0V to 3.6V. This eliminates the need for additional level-shifting circuitry, simplifying board design, reducing component count, and lowering overall system cost. The outputs are also designed to support live insertion and removal, enhancing the robustness of the system during maintenance or upgrades.

The MC74LCX373DTR2 integrates eight transparent D-type latches into a single package. Each latch features a tri-state output, providing a high-impedance state that is essential for bus-oriented applications. This allows multiple devices to share a common data bus without interference. The latch enable (LE) and output enable (OE) pins offer precise control over data flow. When LE is high, the outputs (Q) follow the data inputs (D). The data is latched—or held—on the low-to-high transition of LE. The OE pin, when set high, places all outputs in a high-impedance state, effectively disconnecting them from the bus.

Constructed with advanced CMOS technology, this IC offers very low power consumption and high noise immunity, which are critical for battery-operated and noise-sensitive applications. Furthermore, it provides impressive high-speed performance, with propagation delays typically just a few nanoseconds, ensuring it can keep up with the demands of modern high-frequency systems. The device is offered in a space-saving TSSOP-20 package (DTR2 denotes a tape and reel packaging for high-volume assembly), making it suitable for densely populated PCBs.

ICGOOODFIND: The onsemi MC74LCX373DTR2 is an exceptional solution for designers seeking a reliable, high-performance, and interface-friendly octal latch for mixed-voltage systems, effectively bridging the gap between legacy 5V and modern low-voltage logic.

Keywords: Low-Voltage, 5V Tolerant, Octal D-Type Latch, Tri-State Outputs, High-Speed Performance.