Maxim Integrated DS3234SN#T&R, Real Time Clock, 256B RAM Serial-SPI, 20-Pin SOIC, Часы реального времени

Highly Accurate RTC with Integrated Crystal and SRAM Completely Manages All Timekeeping Functions
Accuracy ±2ppm from 0°C to +40°C
Accuracy ±3.5ppm from -40°C to +85°C
Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year, with Leap Year Compensation Valid Up to 2099
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
Active-Low RST Input/Output
Two Time-of-Day Alarms
Programmable Square-Wave Output
Simple Serial Interface Connects to Most Microcontrollers
4MHz SPI Bus Supports Modes 1 and 3
Battery-Backup Input for Continuous Timekeeping
Low Power Operation Extends Battery Backup Run Time
Operating Temperature Ranges: Commercial: 0°C to +70°C, Industrial: -40°C to +85°C
300-Mil, 20-Pin SO Package

Applications
GPS
Servers
Telematics
Utility Power Meters

Datasheet - DS3234SN#T&R