PDF MAX1661-MAX1663 Data sheet ( Hoja de datos )

Número de pieza	MAX1661-MAX1663
Descripción	Serial-to-Parallel/Parallel-to-Serial Converters and Load-Switch Controllers with SMBus Interface
Fabricantes	Maxim Integrated Products
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No Preview Available ! 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 The 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 SMBSUS control 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. ________________________Applications Power-Plane Switching Point-of-Load Power-Bus Switching Notebook and Subnotebook Computers Desktop Computers Smart Batteries ____________________________Features o Performs Serial-to-Parallel and Parallel-to-Serial Conversions o Three General-Purpose Digital Input/Output Pins (withstand +28V) o SMBus 2-Wire Serial Interface o Supports SMBSUS Asynchronous Suspend Mode o 3µA Supply Current o +2.7V to +5.5V Supply Range o Space-Saving, Low-Cost 10-Pin µMAX Package ______________Ordering Information PART MAX1661EUB MAX1662EUB MAX1663EUB TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 10 µMAX 10 µMAX 10 µMAX __________________Pin Configuration TOP VIEW VCC 1 I/O1 2 I/O2 3 I/O3 4 GND 5 MAX1661 MAX1662 MAX1663 µMAX 10 ALERT 9 SMBCLK 8 SMBDATA 7 SMBSUS 6 ADD Typical Operating Circuits appear at end of data sheet. ______________________________________________________________Selector Guide PART x MAX1661 POWER-ON- RESET STATE Outputs Low MAX1662 Outputs High (high-Z state) MAX1663 Outputs High (high-Z state) SMBus is a trademark of Intel Corp. INTENDED APPLICATION N-Channel MOSFETs P-Channel MOSFETs P-Channel MOSFETs SMBus ADDRESS ADDRESS PIN ADDRESS GND High-Z VCC 0100000 0111100 1001000 GND High-Z VCC 0100001 0111101 1001001 GND High-Z VCC 0100010 0111110 1001010 ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. 1 page Serial-to-Parallel/Parallel-to-Serial Converters and Load-Switch Controllers with SMBus Interface ______________________________________________________________Pin Description PIN NAME FUNCTION 1 VCC Supply Voltage Input, 2.7V to 5.5V. 2 I/O1 Input 1 or Output 1 (open drain). This pin can tolerate up to 28V. 3 I/O2 Input 2 or Output 2 (open drain). This pin can tolerate up to 28V. 4 I/O3 Input 3 or Output 3 (open drain). This pin can tolerate up to 28V. 5 GND Ground 6 ADD SMBus Address Select Pin (see Table 1 for details). 7 SMBSUS SMBus Suspend-Mode Control Input. Drive low to select the suspend-mode register. Drive high to select the normal-mode register. (See Detailed Description.) 8 SMBDATA SMBus Serial-Data Input/Output (open drain) 9 SMBCLK SMBus Serial Clock Input 10 ALERT Interrupt Output, active low, open drain SMBCLK SMBDATA SMB 8 MAX1661/ MAX1662/ MAX1663 TRANSITION DETECTORS INPUT REGISTER I/01 I/02 I/03 ADD ADDRESS DECODER 7 NORMAL DATA REGISTER NORMAL MUX SUSPEND CONTROL O1 ALERT RESPONSE REGISTER NORMAL MUX SUSPEND CONTROL O2 ALERT R FAULT S LATCH Figure 1. Functional Diagram THERMAL SHUTDOWN SUSPEND- MODE DATA REGISTER NORMAL MUX SUSPEND CONTROL O3 SMBSUS _______________________________________________________________________________________ 5 5 Page Serial-to-Parallel/Parallel-to-Serial Converters and Load-Switch Controllers with SMBus Interface __________Applications Information Bypassing and Grounding Considerations Voltage transients exceeding 500mV at 25V/µs may trigger a false interrupt and thermal-shutdown indica- tion. If large VCC transients are expected, add a 100Ω resistor in series with VCC. Retain the 0.1µF capacitor from VCC to GND to act as a filter. P-Channel/N-Channel Load Switch with Controlled Turn-On For a more controlled voltage-switching application, add a series resistor to slow the switch turn-on time. The external MOSFET gate has typical capacitance of 150pF to 2000pF, but an optional external capaci- tance can be added to further slow the switching time (Figure 6). +5V 10k 10k 10k TO/FROM HOST 100Ω* VCC MAX1662 MAX1663 ALERT I/O1 SMBDATA SMBCLK SMBSUS I/O2 I/O3 ADD GND 10k 0.01µF* 10k 0.01µF* 10k 0.01µF* 0.1µF 200k IRF7406 200k IRF7406 200k IRF7406 LOAD1 LOAD2 LOAD3 +5V 10k 10k 10k 0.1µF TO/FROM HOST 100Ω* VCC MAX1661 ALERT I/O1 SMBDATA SMBCLK SMBSUS ADD GND I/O2 I/O3 Figure 6. Load Switch with Controlled Turn-On +12V 10k 10k 10k IRF7413 IRF7413 200k 200k 200k IRF7413 0.01µF* 0.01µF* 0.01µF* LOAD1 LOAD2 LOAD3 *OPTIONAL ______________________________________________________________________________________ 11 11 Page

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