DESCRIPTION

The DS2408 is an 8-channel, programmable I/O 1-Wire chip. PIO outputs are configured as open-drain and provide an on resistance of 100
max. A robust PIO channel-access communication protocol ensures that PIO output-setting changes occur error-free. A data-valid strobe output can be used to latch PIO logic states into external circuitry such as a D/A converter (DAC) or microcontroller data bus.

FEATURES

Eight Channels of Programmable I/O with Open-Drain Outputs

On-Resistance of PIO Pulldown Transistor 100
Ω(max); Off-Resistance 10M
Ω(typ)

Individual Activity Latches Capture Asynchronous State Changes at PIO Inputs for Interrogation by the Bus Master

Data-Strobe Output to Synchronize PIO Logic States to External Read/Write Circuitry

Built-in Multidrop Controller Ensures Compatibility with Other Dallas Semiconductor 1-Wire® Net Products

Supports 1-Wire Conditional Search Command with Response Controlled by Programmable PIO Conditions

Unique Factory-Lasered 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Part Identity

Communicates to Host with a Single Digital Signal at 15.3kbps or 100kbps using 1-Wire Protocol

Operating Range: 2.8V to 5.25V, -40°C to +85°C