DS1254Y数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

The DS1254 is a fully nonvolatile static RAM (NV SRAM) (organized as 2M words by 8 bits) with built-in real-time clock. It has a self-contained lithium energy source and control circuitry that constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the DS1254 makes use of an attached DS3800 battery cap to maintain clock information and preserve stored data while protecting that data by disallowing all memory accesses. Additionally, the DS1254 has dedicated circuitry for monitoring the status of an attached DS3800 battery cap.
The phantom clock provides timekeeping information including hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The phantom clock operates in either 24-hour or 12-hour format with an AM/PM indicator.
Because the DS1254 has a total of 168 balls and only 35 active signals, balls are wired together into groups, thus providing redundant connections for every signal.

特性 Features

• Real-Time Clock (RTC) Keeps Track of Hundredths of Seconds, Seconds, Minutes, Hours, Days, Date, Months, and Years with Automatic Leap-Year Compensation Valid Up to the Year 2100
• 2M x 8 NV SRAM
• Watch Function is Transparent to RAM Operation
• Automatic Data Protection During Power Loss
• Unlimited Write-Cycle Endurance
• Surface-Mountable BGA Module Construction
• Over 10 Years of Data Retention in the Absence of Power
• Battery Monitor Checks Remaining Capacity Daily
• +3.3V Operation

应用 Application

• RAID系统
• 路由器/交换机
• 电信交换机

简介

DS1254Y属于集成电路（IC）的实时时钟。由制造生产的DS1254Y实时时钟实时时钟 (RTC) 为几乎所有需要保持精确时间的电子设备提供时间和/或日期信息。时钟类型有二进制计数器、时钟/日历/监控器、历时计时器、幻时钟芯片、便携式系统控制器、温度记录器、时间事件记录器和计时器时钟外设。其包含 2 B 至 2 MB 不等的存储器，接口选项有 I2C、并行、串行、SPI、1 线式、2 线式、3 线式和 4 线式。