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Data Sheet

FULL DATA SHEET (PDF, 656kB) Download   E-Mail

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 100Ω 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. DS2408 operation is controlled over the single-conductor 1-Wire bus. Device communication follows the standard Dallas Semiconductor 1-Wire protocol. Each DS2408 has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the chip. The registration number guarantees unique identification and is used to address the device in a multidrop 1-Wire net environment. Multiple DS2408 devices can reside on a common 1-Wire bus and can operate independently of each other. The DS2408 also supports 1-Wire conditional search capability based on PIO conditions or power-on-reset activity; the conditions to cause participation in the conditional search are programmable. The DS2408 has an optional VCC supply connection. When an external supply is absent, device power is supplied parasitically from the 1-Wire bus. When an external supply is present, PIO states are maintained in the absence of the 1-Wire bus power source. The RSTZ signal is configurable to serve as either a hard-wired reset for the PIO output or as a strobe for external circuitry to indicate that a PIO write or PIO read has completed.

Key Features		Applications/Uses
Eight Channels of Programmable I/O with Open-Drain Outputs On-Resistance of PIO Pulldown Transistor 100Ω (max); Off-Resistance 10MΩ (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		Industrial Control Instrumentation Test and Measurement Rack Based Systems Such as Central Office Switches, Wireless Base Stations, and PBXs

Diagram

Block Diagram

Application Notes

Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS2408 Application Note 74: Reading and Writing iButtons via Serial Interfaces - DS2408 Application Note 119: Embedding the 1-Wire Master - DS2408 Application Note 120: Communicating through the 1-Wire Master - DS2408 Application Note 126: 1-Wire Communication Through Software - DS2408 Application Note 148: Guidelines for Reliable 1-Wire Networks - DS2408 Application Note 155: 1-Wire® Software Resource Guide Device Description - DS2408 Application Note 159: Ultra-Reliable 1-Wire Communications - DS2408 Application Note 178: Printed Circuit Board Identification Using 1-Wire Products - DS2408 Application Note 186: Creating Global Identifiers Using 1-Wire Devices - DS2408 Application Note 187: 1-Wire Search Algorithm - DS2408 Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS2408 Application Note 3286: 1-Wire 8-bit LCD Reference Design - DS2408 Application Note 3438: Serial Digital Data Networks - DS2408 Application Note 3989: Add Control, Memory, Security, and Mixed-Signal Functions with a Single Contact - DS2408

Evaluation Kits

none

Design Guides

INTERFACE (PDF) 1-Wire® PRODUCTS (PDF)

Reliability Reports

Reliability Report: DS2408.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-3 of 3
DS2408	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS2408S+T&R			SOIC;16 pin;62 mm² Dwg: 56-G2008-001C (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS2408S			SOIC;16 pin;62 mm² Dwg: 56-G2008-001C (PDF) Use pkgcode/variation: S16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS2408S+			SOIC;16 pin;62 mm² Dwg: 56-G2008-001C (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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New Product Press Release 2003-04-18

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