Logic Level Conversion Method in Serial Data System

AbstractAs electronic design has changed considerably since TTL and 5 V CMOS were the dominant standards for logic circuits. The increasing complexity of modern electronic systems has led to lower voltage logic, which in turn can cause incompatibility between input and output levels for the logic families within a system. This article examines the basics of logic operation and considers, primarily for serial-data systems, analyzes the current digital IC for logiclevel translation; include unidirectional high- to low-Level conversion, input overvoltage tolerance, mixed high-low and low-high translation. Using a transmission-gate method realizes convert bi-level mode transceiver. Through the design of a speed-up scheme that actively pulls up rising edges, thereby minimizing the effect of capacitive loads, in order to solve the rate problem. Now the bidirectional and topology-independent features (push-pull or open-drain) of a single chip solve the universal voltage problem