(Hong Kong)
Product Summary
The DS1742-120 is a full-function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 2k x 8 nonvolatile static RAM. The DS1742-120 contains its own power-fail circuitry, which deselects the device when the VCC supply is in an out-of-tolerance condition. This feature of the DS1742-120 prevents loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided.
Parametrics
DS1742-120 absolute maximum ratings: (1)Voltage Range on Any Pin Relative to Ground:-0.3V to +6.0V ; (2)Storage Temperature Range:-40℃ to +85℃ ; (3)Soldering Temperature (EDIP, leads):+260℃ for 10 seconds.
Features
DS1742-120 features: (1)Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source ; (2)Clock Registers are Accessed Identically to the Static RAM; These Registers are Resident in the Eight Top RAM Locations ; (3)Century Byte Register ; (4)Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power ; (5)BCD Coded Century, Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap Year Compensation Valid Up to the year 2100 ; (6)Battery Voltage Level Indicator Flag ; (7)Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolerance ; (8)Lithium Energy Source is Electrically Disconnected to Retain Freshness until Power is Applied for the First Time ; (9)Standard JEDEC Bytewide 2k x 8 Static RAM Pinout ; (10)Quartz Accuracy ±1 Minute a Month at +25℃, Factory Calibrated ; (11)Underwriters Laboratories Recognized.
Diagrams
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