MAX1608 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Octal SMBus-to-Parallel I/O Expanders

19-1639; Rev 0; 1/00
Octal SMBus-to-Parallel I/O Expanders
General 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
SMBSUS input, without the inherent latency of reprogram-
ming 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 sup-
ply current, and a wide +2.7V to +5.5V supply range. The
MAX1608/MAX1609 are available in space-saving 16-pin
QSOP packages.
Applications
Parallel I/O Expansion
Power-Plane Switching
Notebook and Desktop Computers
Servers and Workstations
Notebook Docking Stations
Industrial Equipment
Pin Configuration
TOP VIEW
IO0 1
IO1 2
IO2 3
IO3 4
IO4 5
IO5 6
IO6 7
IO7 8
MAX1608
MAX1609
QSOP
SMBus is a trademark of Intel Corp.
16 V+
15 SMBSUS
14 SMBCLK
13 ALERT
12 SMBDATA
11 ADD1
10 ADD0
9 GND
Features
o Serial-to-Parallel or Parallel-to-Serial Conversions
o 8 General-Purpose Digital I/O Pins
(withstand +28V)
o SMBus 2-Wire Serial Interface
o Supports SMBSUS Asynchronous Suspend
o 9 Pin-Selectable Slave Addresses
o Outputs High Impedance on Power-Up (MAX1609)
o Outputs Low on Power-Up (MAX1608)
o 2.5µA Supply Current
o +2.7V to +5.5V Supply Range
o 16-Pin QSOP Package
PART
MAX1608EEE
MAX1609EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Typical Operating Circuits
+2.7V TO +5.5V
V+
MAX1609
SMBUS
TO/
FROM
HOST
ALERT
IO1
SMBDATA
IO2
SMBCLK
IO3
SMBSUS
ADD1
ADD _GND IO7
100k
100k
100k
0.1µF
P-CH
LOAD1
LOAD2
LOAD3
Typical Operating Circuits continued at end of data sheet.
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