MAX1662EUB ,Serial-parallel/parallel-to-serial converter and load-switch controller with SMBus interfaceELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, T = T to T , unless otherwise noted. Typical values ..
MAX1664CUP ,Active-Matrix Liquid Crystal Display AMLCD SupplyFeaturesThe MAX1664 integrates power-supply and backplane' Integrates All Active Circuitry for Thre ..
MAX1664EUP ,Active Matrix Liquid Crystal Display (AMLCD) SupplyFeaturesThe MAX1664 integrates power-supply and backplane' Integrates All Active Circuitry for Thre ..
MAX1666AEEP , Advanced Lithium-Ion Battery-Pack Protector
MAX1666SEEE ,Advanced Lithium-Ion Battery-Pack ProtectorApplications2/3/4-Cell Lithium-Ion Battery PackSelector Guide Ordering InformationPART NUMBER OF LI ..
MAX1666XEEP+ ,Advanced Lithium-Ion Battery-Pack ProtectorFeaturesThe MAX1666 provides complete protection against over-' Overvoltage Protectionvoltage, unde ..
MAX4420ESA ,High-Speed, 6A Single MOSFET Drivers19-0039, Rev Cl 1 1/92
lVl/lXI/VI
High-Speed, 6A Single MOSFE T Drivers
MAX4420ESA ,High-Speed, 6A Single MOSFET DriversFeatures
. TTL/CMOS Compatible (IN f 10pA)
. 4.5V to 18V Supply Range (MAX4420/MAX4429)
O 1.59 ..
MAX4420ESA+ ,High-Speed, 6A MOSFET Driver (Noninverting)Applications
Switching Power Supplies
DC-DC Converters
Motor Controllers
Pin-Diode Drivers
..
MAX4426CSA ,Dual High-Speed 1.5A MOSFET Drivers
MAX4426CSA+ ,Dual High-Speed, 1.5A MOSFET Drivers
MAX4426ESA ,Dual High-Speed 1.5A MOSFET Drivers
MAX1661EUB-MAX1662EUB
Serial-parallel/parallel-to-serial converter and load-switch controller with SMBus interface
________________General DescriptionThe MAX1661/MAX1662/MAX1663 serial-to-parallel/
parallel-to-serial converters are intended to control external
power MOSFETs in power-plane switching applications.
These small, low-cost devices can be used on a system
motherboard to control point-of-load switching from a 2-
wire SMBus™ serial interface. Each device has three high-
voltage open-drain outputs that double as TTL-level logic
inputs, giving them bidirectional capabilities. The I/O pins
can withstand +28V, so they can control battery voltage-
distribution switches in notebook computers.
The MAX1661 is intended for driving N-channel MOSFETs
and its outputs are low upon power-up. The MAX1662/
MAX1663 are intended for P-channel MOSFETs, and their
outputs are high-impedance upon power-up. This ensures
that the MOSFETs are off at power-up, so the system can
enforce power-plane sequencing.
The SMBSUScontrol input selects control data between
two separate data registers. This feature allows the system
to select between two different power-plane configurations
asynchronously, eliminating latencies introduced by the
serial bus. Other features include thermal-overload and
overcurrent protection, ultra-low supply current, and both
hardware and software interrupt capabilities. These
devices are available in the space-saving 10-pin µMAX
package.
________________________ApplicationsPower-Plane Switching
Point-of-Load Power-Bus Switching
Notebook and Subnotebook Computers
Desktop Computers
Smart Batteries
____________________________FeaturesPerforms Serial-to-Parallel and Parallel-to-Serial
ConversionsThree General-Purpose Digital Input/Output Pins
(withstand +28V)SMBus 2-Wire Serial InterfaceSupports SMBSUSAsynchronous Suspend Mode3µA Supply Current+2.7V to +5.5V Supply RangeSpace-Saving, Low-Cost 10-Pin µMAX Package
MAX1661/MAX1662/MAX1663
__________________Pin Configuration19-1306; Rev 0; 10/97
______________________________________________________________Selector Guide
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
MAX1661/MAX1662/MAX1663
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.7V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are for TA= +25°C.) (Note 1)
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.
VCCto GND..............................................................-0.3V to +6V
I/O to GND (I/O1, I/O2, I/O3)..................................-0.3V to +30V
I/O Sink Current (I/O1, I/O2, I/O3),
Internally Limited.............................................-1mA to +50mA
Digital Inputs to GND (SMBCLK, SMBDATA,SMBSUS, ALERT).................................................-0.3V to +6V
ADD to GND...............................................-0.3V to (VCC+ 0.3V)
SMBDATA Current, ALERTCurrent....................-1mA to +50mA
Continuous Power Dissipation (TA= +70°C)
10-pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
Operating Temperature Range
MAX166_EUB..................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX1661/MAX1662/MAX1663
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
Note 1:Specifications from 0°C to -40°C are guaranteed by design, not production tested.
Note 2:Supply current is specified for static state only.
Note 3:The SMBus logic block is a static design that works with clock frequencies down to DC. While slow operation is possible, it
violates the 10kHz minimum clock frequency of the SMBus specifications, and may monopolize the bus.
Note 4:Refer to Figures 2a and 2b for SMBus timing parameter definitions (write and read diagrams).
Note 5:A transition must internally provide a hold time of 300ns to accommodate for the undefined region of the falling edge.
Note 6:Refer to Figure 3 for the acknowledge timing diagram and tDVparameter definition.
Note 7:Refer to Figure 5 for START-STOP interrupt timing diagrams and parameter definitions.
Note 8:Refer to Figure 4 for I/O setup and hold timing parameter definitions.
ELECTRICAL CHARACTERISTICS (continued)(VCC= +2.7V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are for TA= +25°C.) (Note 1)
MAX1661/MAX1662/MAX1663
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
__________________________________________Typical Operating Characteristics(VCC= +5.0V, TA= +25°C, unless otherwise noted.)
MAX1661/MAX1662/MAX1663
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
______________________________________________________________Pin DescriptionFigure 1. Functional Diagram
_______________Detailed Description The MAX1661/MAX1662/MAX1663 convert 2-wire
SMBus serial data into three latched parallel outputs
(I/O1, I/O2, I/O3). These devices are intended to drive N-
channel and P-channel, high-side MOSFET switches in
load power-management systems. Readback capabili-
ties allow them to function as parallel-to-serial devices.
The MAX1661/MAX1662/MAX1663 operate from a single
supply with a typical quiescent current of 3µA, making
them ideal for portable applications (Figure 1).
SMBus Interface OperationThe SMBus serial interface is a 2-wire interface with
multi-mastering capability. From a software perspec-
tive, the MAX1661/MAX1662/MAX1663 appears as a
set of byte-wide registers that contain information con-
trolling the I/O_ pins, masking capabilities, and a con-
trol bit that determines which register is being
addressed. The 2-wire slave interface employs stan-
dard SMBus send-byte and receive-byte protocols.
SMBDATA and SMBCLK are Schmitt-triggered inputs
that can accommodate slower edges; however, the ris-
ing and falling edges should still be faster than 1µs and
300ns, respectively. Except for the stop and start con-
ditions, the SMBDATA input never transitions while
SMBCLK is high. A third interface line (SMBSUS) is
used to execute commands asynchronously from previ-
ously stored registers (see the section SMBSUS
(Suspend-Mode) Input). This reduces the inherent
delay in a standard 2-wire serial interface. In the
receive-byte operation, the SMBus interface reads
back I/O states and thermal-shutdown status.
SMBus AddressingEach slave device only responds to two addresses: its
own unique address and the alert response address. The
device’s unique address is determined at power-up
(Table 1). The three-level state of the address-select pin
(ADD) is only sampled upon power-on reset (POR) caus-
ing momentary input bias current of 100µA. The address
will not change until the part is power cycled. Stray
capacitance in excess of 50pF on the ADD pin when
floating may cause address recognition problems.
The normal start condition consists of a high-to-low
transition on SMBDATA while SMBCLK is high. After the
start condition, the master transmits a 7-bit address fol-
lowed by a single bit to determine whether the device is
sending or receiving (high = READ, low = WRITE). If
the address is correct, the MAX1661/MAX1662/
MAX1663 sends an acknowledgment pulse by pulling
SMBDATA low. Otherwise, the address is not recog-
nized and the device stays off the bus and waits until
another start condition occurs.
SMBus Send-Byte CommandsIf the MAX1661/MAX1662/MAX1663 receives its correct
slave address (Table 1) followed by R/Wlow, it expects
to receive a byte of information. If the device detects a
start or stop condition prior to clocking in the byte of
data, it considers this an error condition and disregards
all of the data.
The MAX1661/MAX1662/MAX1663 generates a first
acknowledge after the write bit and another acknowledge
after the data. It executes the data byte at the rising edge
of SMBCLK following the second acknowledge, just prior
to the stop condition (Figure 2a). See Table 2 for send-
byte operations.
SMBSUS
(Suspend-Mode) InputThe SMBus can write to either of the normal-data and
suspend-mode registers via the MSB (bit 7) of the
send-byte word (Table 2). The state of the SMBSUS
input selects which register contents (normal data or
suspend mode) are applied to the I/O_ pins. DrivingSMBSUSlow selects the suspend-mode register, while
driving SMBSUShigh selects the normal-data register.
This feature allows the system to select between two
different power-plane configurations asynchronously,
eliminating latencies introduced by the serial bus.
SMBSUStypically connects to the SUSTAT# signal in a
notebook computer.
SMBus Receive-Byte OperationIf the MAX1661/MAX1662/MAX1663 receives its correct
slave address, followed by R/Whigh, the device
becomes a slave transmitter (Figure 2b). After receiving
the address data, the device generates an acknowl-
edge during the acknowledge clock pulse and drives
SMBDATA in sync with SMBCLK. The SMB protocol
requires that the master terminate the read transmis-
sion by not acknowledging during the acknowledge bit
of SMBCLK. See Table 3 for receive-byte data format.
Figure 4 shows the complete receive-byte operation
timing diagram.
The logic states of the three I/O pins can be read over
the serial interface (Table 3). The state of the I/O pins is
sampled at the falling edge of the SMBCLK pulse that
follows the R/Wbit and acknowledge bit (Figure 4). The
states of the I/O bits in the status register reflect the
MAX1661/MAX1662/MAX1663
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
Table 2. Format for Send-Byte Data
MAX1661/MAX1662/MAX1663
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus InterfaceFigure 2a. SMBus Send-Byte Timing Diagram and Format
*Note:POR states apply to both suspend- and normal-mode registers.
current I/O pin states (i.e., they are not latched). There
is a 15µs data-setup time requirement, due to the slow
level translators needed for high-voltage (28V) opera-
tion. Data-hold time is zero.
InterruptsThe MAX1661/MAX1662/MAX1663 generate interrupts
(hardware and software) whenever the logic states of
the I/O pins change or when thermal shutdown occurs.
Interrupts are signaled with the hardware ALERTpin
MAX1661/MAX1662/MAX1663
Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interfaceand with the software START-STOP method (software
interrupts are discussed in the START-STOP Software
Interruptsection). The I/O interrupts can be masked
individually. In addition, the software START-STOP
interrupt can be masked independently. The power-on-
reset state masks the START-STOP interrupt, as well as
the individual I/O interrupts to the ALERTpin (Table 1).
The thermal-shutdown interrupt cannot be masked.
Note that excessive noise on the supply can cause
false interrupts (see Applications Information).
The MAX1661/MAX1662/MAX1663 are slave-only
devices that never initiate communications, except
when asserting an interrupt by forcing ALERTlow, or
via the software START-STOP interrupt.
Alert Response Address (0001100)The Alert Response (interrupt pointer) address pro-
vides quick fault identification for simple slave devices
that lack the complex, expensive logic needed to be a
bus master. When a slave device generates an inter-
Figure 2b. SMBus Receive-Byte Timing Diagram and Format
Table 3. Format for Receive-Byte Data
