Telecommunications

If it's electronic, it needs a clock...
Commonly-used features
Nonvolatile Memory for Time Stamping Events Watchdog Timer Periodic Interrupt Choice of Interface

Recommended RTCs for telecommunications

DS3045W: 3.3V Single-Piece 1Mb Nonvolatile SRAM with Clock
DS1390, DS1391, DS1392, DS1393, DS1394: Low-Voltage SPI/3-Wire RTCs with Trickle Charger
DS1339, DS1339C, DS1339U: I²C Serial Real-Time Clock
DS1557: 4Meg, Nonvolatile, Y2K-Compliant Timekeeping RAM

Application Notes

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