Si86Sx 1ch~6ch High Speed Multichannel Digital Isolator

Si86S6xx, Si86SLxx, Si86SMxx, Si86SQxx, Si86SSxx,6KVrms,

In this article, we will introduce the upper compatible product of the current product (Si86xx series),

High noise immunity (CMTI: 150kV/us@10kbps*), high withstand voltage (Max 6kVrms, ±10kVpk surge), high speed data rate (Max 150Mbps)

We will introduce the digital isolator "Si86Sx" that can realize

* When using a built-in deglitch filter

Product Summary

The Si86Sx series is a digital isolator using a low power consumption CMOS process.
It has higher insulation characteristics and CMTI characteristics, and is a high-speed and robust product group that is top class in the industry. The delay variation between channels is small (2ns max) and the PWD is as small as 2ns (max), making it ideal for signal lines such as ADCs and DACs. There are also products that are pin-compatible with the previously released Si86xx series. We have a lineup of 1/2/3/4/6ch, low power consumption type, models with sleep terminal, and models suitable for SPI, QSPI, and I2C bus.

For details, refer to the model number table and data sheet described later.

Si86Sxx lineup
Si86S6xx Si86xx Pin compatible Upgraded insulation characteristics
Si86SLx Low power consumption type　
Si86SMx Sleep mode product that can turn off the power on the secondary side from the primary side
Si86SS4x for SPI
Si86SQx Signal direction switchable product for QSPI
Si86SOx Inverted output product
SI86SxxxF/H Built-in Deglitch Filter Option

Product features

Lineup of 1/2/3/4/6ch / Possible to replace from Si86xx / (SI86S6xx series)
Supports high-speed signals of 150 Mbps, CMTI is as high as 100 kV/us (min)
150kV/us (min) CMTI at ~10Mbps with built-in deglitch filter
Low current consumption lineup (Low power: IDD1+IDD2≒1mA/ch @500KHz Sleep Mode: IDD1≒0.75mA during sleep)
Lineup supporting SPI and QSPI interfaces (Si86SSx:SPI Si86SQx:QSPI)
10KV bipolar surge withstand, isolation voltage up to 2121V working voltage/ 6KVrms
Default Hi, Low output options
QSOP SOIC SOIC-wide body (Clearance/Creepage 8mm) Various packages
Supports 2.5V/3.3V/5V power supply
Display of electrical characteristics over a wide temperature range (TA=-40 to 125°C)

Features of each product lineup

Pin compatible with Si86xx products High dielectric strength Si86S6xx

The Si86S6xx is pin compatible with the Si86xx. Although there are some differences in characteristics such as TTL input and CMOS input, it is ideal for customers who want to improve noise immunity (CMTI characteristics Up and deglitch filter), isolation voltage, and surge voltage.

* If you are considering replacing the current series (Si86xx) and want to know the detailed differences between Si86xx vs Si86Sx,

AN1359 Design Considerations for Si86Sx Family.See

Low current consumption type Si86SLxx

Si86SLxx is a model that prioritizes power saving with the same pin arrangement as Si86xx and Si86S6xx. Propagation Delay is 11.5ns (typ) compared to 9ns (typ) of normal products, PWD (Pulse Width Distortion) is 7ns (max) compared to 3.5ns (max) of normal products, and there are some differences in characteristics. Yes, but the current consumption is about 20% lower than the Si86Sx product.

Si86SMxx with built-in sleep mode

Isolator that can turn off the secondary power supply, Sleep Mode, Isolator — Operation reference image diagram

The Si86SMxx are low current consumption products with a sleep mode pin (SMB).

By setting the SMBpin on the primary side to Low, the output power on the secondary side can also be turned off. Products with an enable pin on the secondary side require a separate isolator to turn off the secondary side, but this is not necessary.SMBpin is always working, but IDD1 is about 750uA (typ) and low current consumption. Output at Sleep is High Impedance. It is useful in systems where secondary power consumption is a concern.

Si86SSxx for SPI

SPI, Isolator, Isolator, selectable, CS terminal — Si86SSxx SPI application reference example

The Si86SS41 is an isolator for SPI. Since there is a Chip Select (CS) terminal, it is possible to share the SLK, MOSI, and MISO of multiple devices, so the controller can control multiple SPIs with the minimum signal line.

Si86SQxx for QSPI

QSPI, bidirectional, Direction, signal direction, variable — Operation reference image diagram

The Si86SQ44 is a QSPI (Quad SPI) compatible product.
The DIR pin can change the signal direction for transmission and reception, and can operate in half-duplex mode.
Quad SPI is a standard used to speed up data transfer when accessing serial memory such as flash memory. It facilitates the design of the interface between the external serial memory and the microcomputer.
It is similar to SPI, but has four data lines (MOSI and MISO) instead of two, the data lines operate in half-duplex mode, and all four lines carry 4 bits of data on the same clock edge. Read and write.

Inverted output lineup Si86SOxx

DCDC Converter, Inverting Logic, Isolator, Isolator — Reference operation image

Si86SOxx is a lineup of inverted output.
The open-collector output of a photocoupler is generally an inverted output product. Using the Si86Sxx eliminates the need for additional inverters when the input/output truth values must be matched for /INT, /RESET, and /FAULT signals.
By using inverting logic, you can easily configure the logic of a low-cost DCDC converter.

Glitch filter option Si86SxxxH,F

The Si86Sxx has an option with a built-in deglitch filter. Signals shorter than td are not passed, and signals exceeding this are output without cutting the pulse width. This allows the signal to be sent without compromising the PWD. PWD = |t _PLH- t _PHL| is 2 ns (max) except for some models. (Please check the data sheet for details)