Si80xx

Rev. 1.0

11

3.1. Device Startup

Outputs are held low during powerup until VDD is above the UVLO threshold for time period tSTART. Following

this, the outputs follow the states of inputs.

3.2. Undervoltage Lockout

Undervoltage Lockout (UVLO) is provided to prevent erroneous operation during device startup and shutdown or

when VDD is below its specified operating circuits range. Both Side A and Side B each have their own

undervoltage lockout monitors. Each side can enter or exit UVLO independently. For example, Side A

Figure 5. Device Behavior during Normal Operation

INPUT

UVLO-

UVLO+

UVLO-

UVLO+

OUTPUT

tSTART

tSTART

tSTART

tPHL

tPLH

tSD