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PDF MAX1609 Data sheet ( Hoja de datos )
| Número de pieza | MAX1609 | |
| Descripción | Octal SMBus-to-Parallel I/O Expanders | |
| Fabricantes | Maxim Integrated | |
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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
SMBDATA
SMBCLK
SMBSUS
ADD1
ADD GND
IO1
IO2
IO3
IO7
100k
0.1µF
100k
100k
P-CH
LOAD1
LOAD2
LOAD3
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Octal SMBus-to-Parallel I/O Expanders
Typical Operating Characteristics (continued)
(V+ = +5V, TA = +25°C, unless otherwise noted.)
ALERT DELAY
(IO_ FALLING)
MAX1608
IO_ POWER-UP RESPONSE
PULL-UP = 10kΩ to V+
IO_
2V/div
VIO_
500mV/div
PIN
1– 8
9
10, 11
12
13
14
15
16
IO_ DRIVEN EXTERNALLY
200ns/div
NAME
IO0– IO7
GND
ADD0, ADD1
SMBDATA
ALERT
SMBCLK
SMBSUS
V+
ALERT
5V/div
V+
2V/div
Pin Description
FUNCTION
Combined Input/Output. Open-drain output. Can withstand +28V.
Ground
SMBus Address Select. See Table 1.
SMBus Serial-Data Input/Output. Open-drain output. Requires external pull-up resistor.
Active-Low Interrupt Output. Open-drain output. Requires external pull-up resistor.
SMBus Serial Clock Input
SMBus Suspend-Mode Control Input. The device will enter the state previously stored in
the suspend-mode registers if low, or enter the state previously stored in the normal-mode
registers if high.
Supply Voltage Input, +2.7V to +5.5V. Bypass to GND with a 0.1µF capacitor.
Detailed Description
The MAX1608/MAX1609 convert 2-wire SMBus serial
data into eight latched parallel outputs (IO0–IO7). These
devices are intended for general-purpose remote I/O
expansion. Each device has eight high-voltage open-
drain outputs that double as TTL-level logic inputs.
Typical applications range from high-side MOSFET load-
switch drivers in power-management systems, to push-
button switch monitors, to general-purpose digital I/Os.
The MAX1608/MAX1609 include two complete sets of
registers, each consisting of one output data register to
set the output states and two interrupt mask registers.
The SMBSUS line selects which set of registers control
the device state. The input register is used to perform
readback of the actual IO states.
The MAX1608/MAX1609 operate from a single +2.7V
to +5.5V supply with a typical quiescent current of
2.5µA, making them ideal for portable applications.
Additionally, the devices include an ALERT function to
alert the master of change of condition (Figure 1).
_______________________________________________________________________________________ 5
5 Page 
Octal SMBus-to-Parallel I/O Expanders
Table 3. Data Register 1 (NDR1 and SDR1) Bit Assignments (read or write)
POR STATE
BIT NAME
MAX1608 MAX1609
FUNCTION
7 IO7 0
1 Sets IO7 state. 0 = on (low state), 1 = off (high-impedance).
6 IO6 0
1 Sets IO6 state. 0 = on (low state), 1 = off (high-impedance).
5 IO5 0
1 Sets IO5 state. 0 = on (low state), 1 = off (high-impedance).
4 IO4 0
1 Sets IO4 state. 0 = on (low state), 1 = off (high-impedance).
3 IO3 0
1 Sets IO3 state. 0 = on (low state), 1 = off (high-impedance).
2 IO2 0
1 Sets IO2 state. 0 = on (low state), 1 = off (high-impedance).
1 IO1 0
1 Sets IO1 state. 0 = on (low state), 1 = off (high-impedance).
0 IO0 0
1 Sets IO0 state. 0 = on (low state), 1 = off (high-impedance).
Table 4. Data Register 2 (NDR2 and SDR2) Bit Assignments (read or write)
BIT NAME POR STATE
FUNCTION
7 MASKH7 1 Masks IO7 low-to-high interrupt. 0 = interrupts, 1 = masked.
6 MASKH6 1 Masks IO6 low-to-high interrupt. 0 = interrupts, 1 = masked.
5 MASKH5 1 Masks IO5 low-to-high interrupt. 0 = interrupts, 1 = masked.
4 MASKH4 1 Masks IO4 low-to-high interrupt. 0 = interrupts, 1 = masked.
3 MASKH3 1 Masks IO3 low-to-high interrupt. 0 = interrupts, 1 = masked.
2 MASKH2 1 Masks IO2 low-to-high interrupt. 0 = interrupts, 1 = masked.
1 MASKH1 1 Masks IO1 low-to-high interrupt. 0 = interrupts, 1 = masked.
0 MASKH0 1 Masks IO0 low-to-high interrupt. 0 = interrupts, 1 = masked.
slave attempts to respond, bus arbitration rules apply,
with the lowest address code going first. The other
device(s) will not generate an acknowledge and will
continue to hold the ALERT pin low until it is allowed to
clear its own interrupt.
Clearing the interrupt has no effect on the state of the
status registers.
Input/Output Pins
Each IO_ pin is protected by an internal 20mA (typical)
current-limit circuit. Typical pull-down on-resistance at
VCC = +2.7V and +5.5V is 100Ω and 66Ω, respectively.
When the IO_ is high impedance, it actually has a
0.5µA pull-down current source included as part of the
read-back functionality.
External pull-up resistors and IO_ sink capability can
affect the outputs’ rise and fall times. When using the
MAX1608/MAX1609 to control an external MOSFET in
power-switching applications, pull-up and/or series resis-
tance can be used together with the MOSFET’s gate
capacitance or additional external capacitance (Figure 6)
to control the transition time of the switched source.
The input logic levels are TTL compatible and are sam-
pled during a readback SMBus transmission (see RSB
register in Data Registers section ).
Power-On Reset
The MAX1608/MAX1609’s power-on-reset circuit
ensures that the IO_ states are defined when V+ is first
applied or when the supply dips below the UVLO
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX1609.PDF ] | |
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