N21C21A

1 Kb 1-Wire EPROM Add-Only Memory N21C21A Description The N21C21A is a 1K−bit serial EPROM containing a factory− programmed, unique 48−bit identification number, 8−bit CRC generation, and the 8−bit family code (09h). A 64−bit status register controls write protection and page redirection. The N21C21A 1−wire interface requires only a single connection and a ground return. The DATA pin is also the sole power source for the N21C21A. The small surface−mount package options saves printed−circuit− board space, while the low cost makes it ideal for applications such as battery pack configuration parameters, record maintenance, asset tracking, product−revision status, and access−code security. Features 1024 Bits of One−Time Programmable (OTP) EPROM For Storage Of User−Programmable Configuration Data Factory−Programmed Unique 64−Bit Identification Number Single−Wire Interface to Reduce Circuit Board Routing Synchronous Communication Reduces Host Interrupt Overhead No Standby Power Required 8 byte RAM Buffer (Scratch Pad) Available in a 3−Pin SOT−23 This is a Pb−Free Device Applications Security Encoding Inventory Tracking Product−Revision Maintenance Battery−Pack Identification www.onsemi.com SOT−23 SN SUFFIX CASE 527AG 6 1 UDFN6 MU SUFFIX CASE 517AP PIN DESCRIPTIONS DQ 1 3 VSS VSS 2 SOT23 (Top View) Pin Number 1 2 3 Pin Description DQ − DATA Serial I/O VSS VSS 1 DQ VSS UDFN6 (Top View) Pin Number 1 2 3 4 5 6 Pin Description Do not connect (NC)...