原标题：Avnet 介绍 实时时钟

　　PT7C4563串行实时时钟是一种具有可编程方波输出的低功耗时钟/日历。地址和数据通过2线式双向总线连续传输。时钟/日历提供秒、分钟、小时、星期、日期、月份和年份信息。至于天数少于31天的月份，月末的日期会自动调整，包括闰年。时钟采用24小时制。它采用外部32.768kHz石英晶体，支持I2C总线的高速模式(400千赫)，提供可编程方波输出信号，具有振荡器停止标志，后备电流很低(典型值，400nA @ VDD = 3.0V和TA= 25°C)，工作电压范围为1.3V~5.5V。

　　相关料号推荐：

　　PT7C4563WEX

　　The PT7C4563 serial real-time clock is a low-power clock/calendar with a programmable square-wave output. Address and data are transferred serially via a 2-wire bidirectional bus. The clock/calendar provides 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 corrections for leap year. The clock operates in the 24- hour format indicator. Table 1 shows the basic functions of PT7C4563.

　　Key Features

　　Using external 32.768kHz quartz crystal Supports I2C-Bus's high speed mode (400 kHz) Includes time (Hour/Minute/Second) and calendar (Year/Month/Date/Day) counter functions (BCD code) Programmable square wave output signal Oscillator stop flag Low backup current: typ. 400nA at VDD=3.0V and TA=25°C Operating range: 1.3V to 5.5V