DS2408S+ Maxim Integrated Products, DS2408S+ Datasheet

DS2408S+

Manufacturer Part Number

DS2408S+

Description

PROM 1-Wire 8-Ch Addressable Switch

Manufacturer

Maxim Integrated Products

Datasheets

1.DS2408S.pdf (36 pages)

2.DS2408S.pdf (36 pages)

Specifications of DS2408S+

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1-Wire is a registered trademark of Dallas Semiconductor.

FEATURES

§ Eight Channels of Programmable I/O with

§ On-Resistance of PIO Pulldown Transistor

§ Individual Activity Latches Capture

§ Data-Strobe Output to Synchronize PIO

§ Built-in Multidrop Controller Ensures

§ Supports 1-Wire Conditional Search

§ Unique Factory-Lasered 64-Bit Registration

§ Communicates to Host with a Single Digital

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

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 100W 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 V

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.

www.maxim-ic.com

Open-Drain Outputs

100W (max); Off-Resistance 10MW (typ)

Asynchronous State Changes at PIO Inputs

for Interrogation by the Bus Master

Logic States to External Read/Write Circuitry

Compatibility with Other Dallas

Semiconductor 1-Wire

Command with Response Controlled by

Programmable PIO Conditions

Number Ensures Error-Free Device Selection

and Absolute Part Identity

Signal at 15.3kbps or 100kbps using 1-Wire

Protocol

+85°C

supply connection. When an external supply is absent, device power is supplied parasitically

Net Products

1 of 36

1-Wire 8-Channel Addressable Switch

PIN CONFIGURATION

ORDERING INFORMATION

DS2408S

/T&R

PART

GND

N.C.

-40°C to +85°C

I/O

RANGE

TEMP

150-mil SO

16-Pin SO, 150 mil

Tape-and-Reel of

DS2408S

N.C.

RSTZ

PACKAGE

DS2408

061604

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