BIDIRECTIONAL I2C ISOLATORS WITH UNIDIRECTIONAL DIGITAL CHANNELS
The Si840x series of isolators are single-package galvanic isolation
solutions for I2C and SMBus serial port applications. These products are
based on Skyworks Solutions proprietary RF isolation technology and offer
shorter propagation delays, lower power consumption, smaller installed
size, and more stable operation with temperature and age versus opto
couplers or other digital isolators.
All devices in this family include hot-swap, bidirectional SDA and SCL
isolation channels with open-drain, 35 mA sink capability and operate to a
maximum frequency of 1.7 MHz. The 8-pin version (Si8400/01) supports
bidirectional SDA and SCL isolation; the Si8402 supports bidirectional SDA
and unidirectional SCL isolation, and the 16-pin version (Si8405) features
two unidirectional isolation channels to support additional system signals,
such as an interrupt or reset. All versions contain protection circuits to
guard against data errors if an unpowered device is inserted into a powered
system.
Small size, low installed cost, low power consumption, and short
propagation delays make the Si840x family the optimum solution for
isolating I2C and SMBus serial ports.
Features
- Independent, bidirectional SDA and
SCL isolation channels. Open drain outputs with 35 mA
sink current. Supports I2C clocks up to 1.7 MHz
- Unidirectional isolation channels
support additional system signals
(Si8405)
- Up to 2500 VRMS isolation
- UL, CSA, VDE recognition
- 60-year life at rated working voltage
- High electromagnetic immunity
- Wide operating supply voltage3.0 to 5.5 V
- Wide temperature range -40 to 125 C
- Transient immunity 25 kV/us
- RoHS-compliant packages: SOIC-8 narrow body, SOIC-16 narrow body
Applications
- Isolated I2C, SMBus
- Isolated digital power supply communications
- Power over Ethernet
- Motor Control Systems
- Hot-swap applications
- Intelligent Power systems
