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V4082V1ST3B Datasheet(PDF) 1 Page - EM Microelectronic - MARIN SA |
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V4082V1ST3B Datasheet(HTML) 1 Page - EM Microelectronic - MARIN SA |
1 / 7 page V4082 Copyright © 2004, EM Microelectronic-Marin SA 1 www.emmicroelectronic.com Identification ROM Description The V4082 is a 64-bit read only memory (ROM) which contains a unique laser engraved serial number. The data in the ROM is partitioned into three sections: An 8- bit identifier code, a 48-bit serial number and an 8-bit cyclical redundancy check (CRC). The serial number is incremented in fabrication such that no two parts have the same code. Communication for reading and writing is done serially via a single data lead (and ground return) using a single wire protocol. Power for reading is derived from the data line itself with no need for an extra power source. The circuit is available in SOT 223 or TO 92 package. Features Unique 48-bit silicon serial number gives 10 14 combinations Factory lasered and tested, no two parts alike 8-bit cyclic redundancy check ensures error-free reading Presence detect indicates to the system when first contact is made Zero standby power required Custom serial numbers available Pin compatible with DS 2400, DS 2401 in TO-92 and SOT-223 Applications Socket identification PCB identification Equipment registration Typical Operating Configuration Control Logic + ROM on chip supply Vcc DATA 5k 1M 100 ohm MOSFET VSS R PUP TX RX Cext V4082 SYSTEM Fig. 1 Pin Assignment TO -92 View Fla t Front V4082 12 3 SO T-223 V4082 123 4 Pin TO92 Pin SOT-223 Name Function 1 2 3 2 1 3 4* VSS DATA NC VSS Ground return Serial data pin Ground return * Internally connected to pin 2 Fig. 2 EM MICROELECTRONIC - MARIN SA |
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