Isolators support 6 unidirectional channels at 150 Mbits/s

Isolators support 6 unidirectional channels at 150 Mbits/s

Offered as the industry’s first such devices to support as many as six unidirectional isolation channels capable of up to 150 Mbits/s across −40° to 125°C, the Si84xx ISOpro digital isolator family for I2 C, SMBus, and PMBus applications offers a typical power consumption of less than 1.7 mA at 10 Mbits/s and less than 4 mA at 100 Mbits/s — four times less power consumption than competitive solutions. The isolators also offer an ESD performance of 4-kV HBM, 2-kV CDM, and 400-V MM.

Jitter performance is said to be less than 250 ps peak and more than twice lower than competitive offerings, while propagation delays are less than 10 ns typ, 65% lower than optocoupler-based solutions. In addition, the devices feature an optional 200-μA energy-efficient “sleep mode” to reduce quiescent power by more than three times over the closest competitor. The family also features more than 25 kV/μs of common-mode transient immunity and up to 50 V/m of electric field immunity.

The family includes single-chip, I2 C-compatible isolators: the Si8400 provides bidirectional isolated channels on both the serial data (SDA) and serial clock (SCL) lines, while the Si8405 offers two additional independent unidirectional channels for system signals. The 1- and 2-channel devices are available in narrow-body SOIC-8 packages; the 3-, 4-, 5-, and 6-channel devices come in narrow-body SOIC-16 and wide-body SOIC-16 packages. (From $0.59 ea/prod qty June 2009.)

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