DS2404B

The DS2404 EconoRAM Time Chip offers a simple solution for storing and retrieving vital data and time information with minimal hardware.
The DS2404 contains a unique lasered ROM, real-time clock/calendar, interval timer, cycle counter, programmable interrupts and 4096-bits of SRAM. Two separate ports are provided for communication, 1-Wire and 3-wire. Using the 1-Wire port, only one pin is required for communication, and the lasered ROM can be read even when the DS2404 is without power.
The 3-wire port provides high speed communication using the traditional Dallas Semiconductor 3-wire interface. With either interface, a strict protocol for accessing the DS2404 ensures data integrity. Utilizing backup energy sources, the data is nonvolatile and allows for stand-alone operation.
FEATURES 4096 bits of nonvolatile dual-port memory including real time clock/calendar in binary format, programmable interval timer, and programmable power-on cycle counter 1-WireTM interface for MicroLAN communication at 16.3k bits per second 3-wire host interface for high-speed data communications at 2M bits per second Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike Memory partitioned into 16 pages of 256-bits for packetizing data 256-bit scratchpad with strict read/write protocols ensures integrity of data transfer Programmable alarms can be set to generate interrupts for interval timer, real time clock, and/or cycle counter 16-pin DIP, SOIC and SSOP packages Operating temperature range from -40°C to +85°C Operating voltage range from 2.8 to 5.5 Volts