SI88322BC-ISR

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Digital isolators are a type of interface designed to transfer digital signals between two areas that are electrically isolated. They are popularly used in communications systems, high-speed signal integrity designs, and various other industrial applications. The SI88322BC-ISR is a relatively new digital isolator with a field-proven working principle.

The SI88322BC-ISR utilizes a multi-level and multiple-switch structure to provide isolation of up to 3500Vrms for one minute in accordance with IEC 61010-1. Its small footprint and wide operational temperature range make it the perfect choice for applications with space and temperature restrictions. Additionally, it has a fast propagation delay of 12 ns and high sustain voltage of 30V, which enables it to accurately transfer data signals at high speed.

Its core working principle is based on the concept of step-down or eutectic diode-load isolation. A variety of digital isolator implementations can be built on this principle, including the CMOS role-based structure utilized in the SI88322BC-ISR. This type of digital isolator circuit consists of two identical sets of data transfer switches that are designed to interpret data signals going in both directions across a pair of power supply rails.

The CMOS role-based structure includes a logic circuit that switches a series of transistors, which gives rise to the required level of isolation. The logic circuit can use either statically or dynamically controlled switching to achieve the required switching speed and power efficiency. During the switching operation, the common emitter follower structure of the circuit is driven on and off by the logic circuit in accordance with the waveform of the data signal.

At the same time, when one of the switching devices is turned on, the reference voltage on the input side is applied to the base terminal of the transistor switched on, and a current is generated that causes the voltage to drop across the diode-load. This will then result in a corresponding decrease in the voltage across the device on the output side, allowing for the isolation of the two different circuits.

The SI88322BC-ISR utilizes its eutectic diode-load design for high frequency data transmission for up to 3MHz of data rate. It works by directing the source of energy towards the logic circuit, instead of the secondary output side cap, and transmitting the data with the reference voltage. This helps to ensure that the average voltage applied to the output side is much lower than the input side, thereby avoiding signal distortion.

The SI88322BC-ISR is suitable for a wide range of communication applications, ranging from ultra-high speed serial data transmission to medical, industrial, and automotive applications. Its ultra-low propagation delay-to-isolation ratio of 10.8ns/V ensures fast data transmission, and its high ESD protection allows for reliable operation in any environment.

In conclusion, the SI88322BC-ISR is an ideal choice for isolating data signals between two electrically isolated areas. Its fast propagation speed, wide operating temperature range, and low power consumption make it ideal for use in a variety of different applications. Furthermore, its compact size and eutectic diode-load working principle ensure reliable and accurate data transfer at high speeds.

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