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