Maxim DS1744W-120

Часы/календарьВисокосный год, NVSRAM, Y2K32 КБ

Overview

The DS1744 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) and 32k x 8 NV SRAM. User access to all registers within the DS1744 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.

■ 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 32k 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■ UL Recognized

Features

Applications

• Portable instruments
• Electronic metering
• Battery powered products
• Automotive
• Industrial
• Digital still camera
• Digital video camera
• Printers
• Copy machines
• Mobile equipment