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Octal, SMBus-to-Parallel I/O Expanders

Octal, SMBus Serial-Parallel I/O Expanders Work Remotely via SMBus

Product Details

Key Features

Applications/Uses

Parametric specs for Power-Plane/Card-Bus Switches
Description Octal SMBus-to-Parallel I/O Expander
# Switches 8
IMAX (A) 0.025
VIN (V) 0 to +28
Package/Pins QSOP/16
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
0
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Simplified Block Diagram

Technical Docs

Data Sheet Octal, SMBus-to-Parallel I/O Expanders Nov 07, 2006

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Parameters

Parametric specs for Power-Plane/Card-Bus Switches
Description Octal SMBus-to-Parallel I/O Expander
# Switches 8
IMAX (A) 0.025
VIN (V) 0 to +28
Package/Pins QSOP/16
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
0

Key Features

  • Serial-to-Parallel or Parallel-to-Serial Conversions
  • 8 General-Purpose Digital I/O Pins (withstand +28V)
  • SMBus 2-Wire Serial Interface
  • Supports SMBSUS-bar Asynchronous Suspend
  • 9 Pin-Selectable Slave Addresses
  • Outputs High Impedance on Power-Up (MAX1609)
  • Outputs Low on Power-Up (MAX1608)
  • 2.5µA Supply Current
  • +2.7V to +5.5V Supply Range
  • 16-Pin QSOP Package

Applications/Uses

  • Industrial Equipment
  • Notebook and Desktop Computers
  • Notebook Docking Stations
  • Parallel I/O Expansion
  • Power-Plane Switching
  • Servers and Workstations

Description

The MAX1608/MAX1609 provide remote input/output (I/O) expansion through an SMBus™ 2-wire serial interface. Each device has eight high-voltage open-drain outputs that double as TTL-level logic inputs, providing continuous bidirectional capabilities. The open-drain outputs tailor the MAX1608/MAX1609 for use in load-switching and other level-shifting applications as well as general-purpose I/O applications.

Two complete sets of registers allow the device and its outputs to be toggled between two states using the active-low SMBSUS input, without the inherent latency of reprogramming outputs over the serial bus. The eight I/O lines are continuously monitored and can be used as inputs. Each line can generate asynchronous maskable interrupts on the falling edge, the rising edge, or both edges.

For load-switching applications, the MAX1608 is designed to drive N-channel MOSFETs, and its outputs are low upon power-up; the MAX1609 is designed to drive P-channel MOSFETs, and its I/Os are high impedance upon power-up. Other features of both devices include thermal-overload and output-overcurrent protection, ultra-low supply current, and a wide +2.7V to +5.5V supply range. The MAX1608/MAX1609 are available in space-saving 16-pin QSOP packages.

Simplified Block Diagram

 

Technical Docs

Data Sheet Octal, SMBus-to-Parallel I/O Expanders Nov 07, 2006

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .