DESCRIPTION

The SC1543 provides a glitch free 3.3V output when one of two 3.3V input sources is present. It does not require external logic to sequence from one input source to the other. Whenever VIN1 exceeds a predetermined threshold value the internal MOSFET connects it’s source voltage to the output. If the input at VIN1 is below the threshold another internal MOSFET connects VIN2 to the output. If both inputs are at 3.3V then VIN1 will be connected to the output.

FEATURES

• Glitch free transitions between inputs

• Internal logic selects appropriate input

• 400mA load current capability from main input

• Low power shutdown mode

• Industrial temperature range

APPLICATIONS

• Mini PCI cards

• Peripheral cards

• Instantly available personal computers (IAPCs)