DS28CM00 IC/SMBus Silicon Serial Number www.maxim-ic.com GENERAL DESCRIPTION FEATURES The DS28CM00 is a low-cost, electronic registration Unique, Factory-Lasered and Tested 64-bit number to provide an absolutely unique identity that Registration Number (8-bit Family Code + 48-bit can be determined with the industry standard IC and Serial Number + 8-bit CRC) SMBus interface. The registration number is a SMBus-Compatible IC Serial Interface factory-lasered, 64-bit ROM that includes a unique Supports 100kHz and 400kHz Communication 48-bit serial number, an 8-bit CRC, and an 8-bit Speeds family code (70h). In SMBus mode, the DS28CM00 5V Tolerant Interface Pins resets its communication interface if it detects a bus Operating Range: 1.8V 10% to 5V 5%, -40C fault condition. to +85C 5-Pin SOT23 Package APPLICATIONS ORDERING INFORMATION Printed Circuit Board Unique Serialization Accessory and Peripheral Identification PART TEMP RANGE PIN-PACKAGE Equipment Registration and License Management SOT23-5 DS28CM00R-A00+T -40 C to +85 C Tape-and-Reel Network Node Identification +Denotes lead-free package. PIN CONFIGURATION TYPICAL OPERATING CIRCUIT VCC 1 SCL 5 VCC R R P P 2 GND V CC SDA 3 4 SDA NC SCL V CC C SDA SOT23 SCL DS28CM00 GND GND Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 9 REV: 072406 DS28CM00: IC/SMBus Silicon Serial Number ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground -0.5V, +6V Maximum Current Into Any Pin 20mA Operating Temperature Range -40C to +85C Junction Temperature +150C Storage Temperature Range -55C to +125C Soldering Temperature See IPC/JEDEC J-STD-020 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 the absolute maximum rating conditions for extended periods may affect device. ELECTRICAL CHARACTERISTICS (-40C to +85C, see Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 1.62 5.25 V CC Standby Current I Bus idle, V = 5.25V 3 A CCS CC Bus active at 400kHz, V CC Operating Current I 200 A CCA = 5.25V SCL, SDA Pins (Note 2) See Figure 5 0.3 -0.3 V 2.0V CC V CC LOW Level Input Voltage V V IL 0.25 V < 2.0V -0.3 CC V CC 0.7 V + CCmax V 2.0V CC HIGH Level Input Voltage V 0.3V CC V V IH (Note 3) 0.8 V + CCmax V < 2.0V CC V 0.3V CC 0.05 V 2.0V CC Hysteresis of Schmitt Trigger V CC V V hys Inputs (Note 4) 0.1 V < 2.0V CC V CC LOW Level Output Voltage at V 0.4 V OL 4mA Sink Current Output Fall Time from V to 20 + Ihmin V 2.0V 250 CC V with a Bus Capacitance 0.1Cb ILmax t ns of from 10pF to 400pF (Notes 4, 20 + V < 2.0V 450 CC 5) 0.1Cb Pulse Width of Spikes that are SDA and SCL pins only t 50 ns SP Suppressed by the Input Filter (Note 4) Input Current with an Input Voltage Between 0.1V and I (Note 6) -10 10 A CC i 0.9V CCmax Input Capacitance C (Note 4) 10 pF i V 2.0V 400 CC SCL Clock Frequency (Note 7) f kHz SCL V < 2.0V 344 CC Bus Time-out t (Note 7) 25 75 ms TIMEOUT Hold Time (Repeated) START Condition. After this Period, the t (Note 8) 0.6 s HD:STA First Clock Pulse is Generated. V 2.7V 1.3 CC LOW Period of the SCL Clock t s LOW V 2.0V 1.5 CC (Note 8) V < 2.0V 2.3 CC HIGH Period of the SCL Clock t (Note 8) 0.6 s HIGH Setup Time for a Repeated t (Note 8) 0.6 s SU:STA START Condition 2 of 9