Company Name: Excellent Integrated System LIMITED

Contact Person : John

Email/Msn    :John(at)eis-ic.com

Tel          : 00852-30777742

Add.: RM 906, WORKINGBERG COMM BLDG, 41-47 MARBLE RD, HONGKONG

Excellent Integrated System LIMITED (EIS LIMITED), Established in 1991, is a professional independent stocking distributor of electronic components and specialize in buying the EXCESS STOCK from the original equipment manufacturers (OEMs), Contract equipment manufacturers (CEMs), and many other factories. EIS has gained good experiences in Excess Inventory Management through its development over 20 years and has become the reliable partner for the domestic and foreign OEM manufacturers. If any inquiry and question,please email us: john(at)eis-ic.com.

Description as follow:

The DS1742W-120 is a full-function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 2k x 8 nonvolatile static RAM. The DS1742W-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 DS1742W-120 prevents loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided.

Parametrics

DS1742W-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

DS1742W-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