DS1644 Datasheet Nonvolatile Timekeeping Ram

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: 19-5203; Rev 4/10 DS1644/DS1644P Nonvolatile Timekeeping RAM www.maxim-ic.

Datasheet Details

Part number	DS1644
Manufacturer	Maxim Integrated (now Analog Devices)
File Size	209.95 KB
Description	Nonvolatile Timekeeping RAM
Datasheet	DS1644-MaximIntegrated.pdf

PIN PDI

Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source.
Clock Registers are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations.
Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power.
BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year Compensation Valid Up to 2100.
Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolera.

Brand Logo	Part Number	Description	Manufacturer
	DS1644LPM	Nonvolatile Timekeeping RAM	Dallas Semiconducotr

Part Number	Description
DS1644P	Nonvolatile Timekeeping RAM
DS1642	Nonvolatile Timekeeping RAM
DS1646	Nonvolatile Timekeeping RAM
DS1646P	Nonvolatile Timekeeping RAM
DS1647	Nonvolatile Timekeeping RAM
DS1647P	Nonvolatile Timekeeping RAM
DS1602	Elapsed Time Counter
DS1603	Elapsed Time Counter
DS1620	Digital Thermometer/Thermostat
DS1621	Digital Thermometer