MC100ELT21DG

The MC100ELT21DG is a device that converts a logic level between two points on a circuit. It operates on a wide variety of logic family voltages, typically between 0.8 V and 3.6V, taking a single-ended input signal and translating it to a different voltage level. This makes it a handy device for interfacing with mixed-voltage systems or targeting a particular voltage target. It also allows semiconductor designers to create parts or systems that bridge the gap between older and newer technologies.

Application Field

The MC100ELT21DG is used in a range of applications, often involving interfacing with systems that use different voltage equations, such as older TTL logic supplies designed for 5V circuits, with newer logic families that support only 1.8 or 0.8V. The MC100ELT21DG provides a low-cost way to bridge the voltage gap and allow systems to communicate by taking a 3.3V supply and translating it to 5V.

Other common applications are associated with signal translation from digital to analog circuits and vice-versa, as well as signal translation from different communication protocols. The MC100ELT21DG is often used for signal regularization across digital, analog, and communication linkages.

Working Principle

The MC100ELT21DG translates between logic levels by using the current source biasing of its four complementary MOSFET pairs and three biasing resistors to create a differential amplifier. This allows the input signal to be decoupled and a low offset voltage retention circuit to maintain output voltage shifts, regardless of changes in input voltage or temperature.

The chip requires a total of five pins, and a single supply voltage to operate. It has a low output current and a wide input voltage range. It also has an enable/disable control pin, which allows the user to switch between power input and output relatively quickly and easily.

The MC100ELT21DG is a reliable device that operates over a wide temperature range and is suited for a variety of applications in which logic level shifting is required.