DS1746W-120IND

Y2K兼容，非易失时钟RAM Y2K-Compliant, Nonvolatile Timekeeping RAMs

DESCRIPTION

The DS1746 is a full-function, year-2000-compliant Y2KC, real-time clock/calendar RTC and 128k x 8 nonvolatile static RAM. User access to all registers within the DS1746 is accomplished with a byte-wide interface as shown in Figure 1. The RTC information and control bits reside in the eight uppermost RAM locations. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal BCD format. Corrections for the date of each month and leap year are made automatically.

FEATURES

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.

Century Byte Register i.e., Y2K Compliant

Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power

BCD-Coded Century, Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap Year Compensation Valid Up to the Year 2100

Battery Voltage-Level Indicator Flag 

Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolerance

Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time

DIP Module Only Standard JEDEC Byte-Wide 128k x 8 Static RAM Pinout

PowerCap Module Board Only

  Surface Mountable Package for Direct Connection to PowerCap Containing Battery and Crystal

  Replaceable Battery PowerCap

  Power-On Reset Output

  Pin-for-Pin Compatible with Other Densities of DS174xP Timekeeping RAM

Also Available in Industrial Temperature Range: -40°C to +85°C

Underwriters Laboratories UL Recognized