The CAT9552 is a 16-channel, parallel input/output port expander optimized for LED On/Off and blinking control. Each individual LED may be turned ON, OFF, or set to blinking at one of two programmable rates. The CAT9552 is compatible with I2C and SMBus applications where it is desireable to limit the bus traffic or free-up the bus master's internal timer. Three address pins allow up to eight CAT9552 devices to occupy the same bus.