1-Wire® Serial Memory Products

Add Memory to a product with a single electrical connection! 1-Wire serial memory products provide EEPROM and EPROM memory arrays that are both powered and operated over the single-contact 1-Wire interface. The 1-Wire interface provides advantages over other industry interfaces such as I²C or SPI™ in applications where contacts between the host controller and memory device are limited or must be minimized, and/or where factory-programmed unique device serialization is required or valuable. 1-Wire devices require a total of two contacts for total device operation, compared to four contacts for I²C memory or five contacts for SPI memory. With unique 64-bit device serial numbers and network-capable command protocol, 1-Wire memory devices can be multidropped on a common 1-Wire line and operated independently. 1-Wire memory security features vary from SW-programmable write protection to low-cost, cryptographically secure, bidirectional, authentication which is implemented with the industry-standard secure hash algorithm (SHA-1). With only a single contact and ground return, the 1-Wire interface can easily be implemented from a spare controller port pin. This means that the costs to implement a 1-Wire system are minimal. 1-Wire Memory Devices Part 64-bit ROM Memory Type Memory Size Security SMT Packages DS2401 n/a n/a   6-TSOC, CSP DS2411 n/a n/a   6-TSOC, SOT23, FlipChip DS2430A EEPROM 256-bits E² + 64-bit App Register WP (App Reg only) 6-TSOC, FlipChip DS2431 EEPROM 1kb WP 6-TSOC, CSP DS2432 EEPROM 1kb SHA-1 6-TSOC, FlipChip DS2433 EEPROM 4kb   SO8, FlipChip DS2502, DS2505, DS2506 EPROM 1k, 16k, 64kb WP 6-TSOC, SOT23, CSP Table Legend: WP: software selectable write-protection SHA-1: Secure Hash Algorithm (www.itl.nist.gov/fipspubs/fip180-1.htm), ISO/IEC 10118-3