MAX6621 19-0729 Rev 2 12/09 2 PECI-to-I C Translator General Description Features 2 2 The MAX6621 PECI-to-I C translator provides an effi- 400kbps I C-Compatible, 2-Wire Serial Interface TM 2 cient, low-cost solution for PECI-to-SMBus /I C proto- +3V to +3.6V Supply Voltage col conversion. The PECI-compliant host reads PECI-Compliant Port temperature data directly from up to four PECI-enabled 2 PECI-to-I C Translation CPUs. Interrupts are generated when the measured temperature exceeds the high-temperature limit and ALERT Output causes ALERT to assert. The RESET input allows the RESET Input (May Be Disabled as a Factory 2 host to reset the I C bus in the event of a communica- Option) tion error. Programmable Temperature Offsets 2 The I C interface provides an independent serial com- -20C to +120C Operating Temperature Range munication channel to communicate synchronously with peripheral devices in a multiple master or multiple slave V Input Refers Logic Levels to the PECI REF system. This interface allows a maximum serial-data Supply Voltage rate of 400kbps. 2 Automatic I C Bus Lockup Timeout Reset The MAX6621 is designed to operate from a +3.0V to Lead-Free, 10-Pin MAX Package +3.6V supply voltage and ambient temperature range of -20C to +120C. Applications Ordering Information Servers PART TEMP RANGE PIN-PACKAGE Workstations MAX6621AUB+ -20C to +120C 10 MAX Desktop Computers MAX6621AUB+T -20C to +120C 10 MAX T = Tape and reel. +Denotes a lead(Pb)-free/RoHS-compliant package. SMBus is a trademark of Intel Corp. Pin Configuration appears at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. Typical Application Circuit +3.3V V CPU V TT V CC V SDA SDA REF CPU SCL PECI 2 SCL MAX6621 I C INTERNAL MASTER TEMP RESET SENSOR ALERT AD0 GND Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.2 PECI-to-I C Translator ABSOLUTE MAXIMUM RATINGS (All voltages with respect to GND.) Continuous Power Dissipation (T = +70C) A V ..........................................................................-0.3V to +4V 10-Pin MAX (derate 5.6mW/C over T = +70C)......444mW CC A AD0, RESET, ALERT...................................-0.3V to (V + 0.3V) Operating Temperature Range .........................-20C to +120C CC SCL, SDA .................................................................-0.3V to +6V Junction Temperature......................................................+150C V .........................................................................-0.3V to +4V Storage Temperature Range .............................-65C to +150C REF PECI .........................................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C REF DC Current through SDA ...................................................10mA 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 (Typical Application Circuit, V = +3V to +3.6V, V = +0.95V to +1.26V, T = -20C to +120C, unless otherwise noted. Typical CC REF A values are at V = +3.3V, V = +1.0V, T = +25C.) (Note 1) CC REF A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY Operating Supply Voltage V 3.0 3.6 V CC Operating Supply Current I SCL = 400kHz 4 7 mA CC Power-On-Reset Voltage V 2.60 2.95 V POR INPUT SCL, INPUT/OUTPUT SDA 0.3 Low-Level Input Voltage V V IL x V CC 0.7 High-Level Input Voltage V 5.5 V IH x V CC Low-Level Output Voltage V I = 6mA 0.4 V OL OL Leakage Current I -1 +1 A L Input Capacitance C 10 pF I ALERT Low-Level Output Voltage V I = 6mA 0.4 V OL OL ADDRESS INPUT AD0/RST 0.3 Low-Level Input Voltage V V IL x V CC 0.7 V CC High-Level Input Voltage V V IH x V + 0.3 CC Leakage Current I -2 +2 A L Input Capacitance C 10 pF I PECI Supply Voltage to PECI Cell V 0.95 1.26 V REF V REF Input Voltage Range V -0.3 V IN + 0.3 Low-Level Input Voltage 0.275 0.500 V V IL Threshold x V x V REF REF High-Level Input Voltage 0.550 0.725 V V IH Threshold x V x V REF REF 2 MAX6621