MAX1661/MAX1662/MAX1663
19-1306; Rev 0; 10/97
EVALUATION KIT
AVAILABLE
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
________________General Description ____________________________Features
The MAX1661/MAX1662/MAX1663 serial-to-parallel/ ' Performs Serial-to-Parallel and Parallel-to-Serial
parallel-to-serial converters are intended to control external
Conversions
power MOSFETs in power-plane switching applications.
' Three General-Purpose Digital Input/Output Pins
These small, low-cost devices can be used on a system
(withstand +28V)
motherboard to control point-of-load switching from a 2-
wire SMBus serial interface. Each device has three high- ' SMBus 2-Wire Serial Interface
voltage open-drain outputs that double as TTL-level logic
' Supports SMBSUS Asynchronous Suspend Mode
inputs, giving them bidirectional capabilities. The I/O pins
' 3A Supply Current
can withstand +28V, so they can control battery voltage-
distribution switches in notebook computers.
' +2.7V to +5.5V Supply Range
The MAX1661 is intended for driving N-channel MOSFETs
' Space-Saving, Low-Cost 10-Pin MAX Package
and its outputs are low upon power-up. The MAX1662/
MAX1663 are intended for P-channel MOSFETs, and their
______________Ordering Information
outputs are high-impedance upon power-up. This ensures
that the MOSFETs are off at power-up, so the system can
PART TEMP. RANGE PIN-PACKAGE
enforce power-plane sequencing.
MAX1661EUB -40C to +85C 10 MAX
The SMBSUS control input selects control data between
MAX1662EUB -40C to +85C 10 MAX
two separate data registers. This feature allows the system
MAX1663EUB -40C to +85C 10 MAX
to select between two different power-plane configurations
asynchronously, eliminating latencies introduced by the
serial bus. Other features include thermal-overload and
__________________Pin Configuration
overcurrent protection, ultra-low supply current, and both
hardware and software interrupt capabilities. These
TOP VIEW
devices are available in the space-saving 10-pin MAX
package. V 1 10 ALERT
CC
I/O1 2 9 SMBCLK
MAX1661
________________________Applications
I/O2 3 8 SMBDATA
MAX1662
Power-Plane Switching
MAX1663
I/O3 4 7 SMBSUS
Point-of-Load Power-Bus Switching
GND 5 6 ADD
Notebook and Subnotebook Computers
MAX
Desktop Computers
Smart Batteries
Typical Operating Circuits appear at end of data sheet.
______________________________________________________________Selector Guide
SMBus ADDRESS
POWER-ON- INTENDED
PART
RESET STATE APPLICATION
x ADDRESS PIN ADDRESS
GND 0100000
MAX1661 Outputs Low N-Channel MOSFETs High-Z 0111100
V 1001000
CC
GND 0100001
Outputs High
MAX1662 P-Channel MOSFETs High-Z 0111101
(high-Z state)
V 1001001
CC
GND 0100010
Outputs High
MAX1663 P-Channel MOSFETs High-Z 0111110
(high-Z state)
V 1001010
CC
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
ABSOLUTE MAXIMUM RATINGS
V to GND..............................................................-0.3V to +6V Continuous Power Dissipation (T = +70C)
CC A
I/O to GND (I/O1, I/O2, I/O3)..................................-0.3V to +30V 10-pin MAX (derate 5.6mW/C above +70C) ...........444mW
I/O Sink Current (I/O1, I/O2, I/O3), Operating Temperature Range
Internally Limited.............................................-1mA to +50mA MAX166_EUB ..................................................-40C to +85C
Digital Inputs to GND (SMBCLK, SMBDATA, Storage Temperature Range .............................-65C to +160C
SMBSUS, ALERT).................................................-0.3V to +6V Lead Temperature (soldering, 10sec) .............................+300C
ADD to GND...............................................-0.3V to (V + 0.3V)
CC
SMBDATA Current, ALERT Current ....................-1mA to +50mA
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V = +2.7V to +5.5V, T = T to T , unless otherwise noted. Typical values are for T = +25C.) (Note 1)
CC A MIN MAX A
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 2.7 5.5 V
Static condition; SMBDATA, SMBCLK, ADD,
Supply Current 3 10 A
ALERT = V or GND (Note 2)
CC
Undervoltage Lockout/
V falling 1.2 1.6 2.5 V
CC
Power-On Reset Threshold
V = 0.4V, V = 2.7V or 5.5V 2
I/O_ CC
I/O Sink Current mA
V = 1.0V, V = 4.5V 8 13
I/O_ CC
I/O Current Limit I/O1, I/O2, or I/O3; V = 4.5V 15 20 50 mA
CC
Thermal Shutdown Typical hysteresis of 10C 140 C
V = 28V, high-impedance state 0.5 5
I/O_
I/O Leakage Current A
V = 0V, V ; high-impedance state -1 0.5 1
I/O_ CC
V , V , V ,
SMBDATA SMBCLK SMBSUS
Digital Input Current -1 1 A
V = 0V, V
ADD CC
V = 2.7V to 5.5V;
SMBus Logic Input CC
0 5.5 V
Voltage Range SMBDATA, SMBCLK, SMBSUS
Logic Input High Voltage I/O_, SMBSUS, SMBCLK, SMBDATA 2.4 V
Logic Input Low Voltage I/O_, SMBSUS, SMBCLK, SMBDATA 0.8 V
SMBDATA Output Low Sink
V = 0.6V 6 mA
SMBDATA
Current
V = 0.4V 1 mA
ALERT Output Low Sink Current ALERT
ALERT Output Leakage Current V = 5.5V, high-Z state 1 A
ALERT
SMBus Input Capacitance SMBCLK, SMBDATA 5 pF
SMBus Clock Frequency (Notes 3, 4) 100 kHz
Measured between the 90% level of the rising
SMBCLK High Time t 4 s
HIGH
edge and the 90% level of the falling edge
Measured between the 10% level of the falling
SMBCLK Low Time t 4.7 s
LOW
edge and the 10% level of the rising edge
2 _______________________________________________________________________________________
MAX1661/MAX1662/MAX1663