V3021数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

The V3021 is a low power CMOS real time clock. Data is transmitted serially as 4 address bits and 8 data bits, over one line of a standard parallel data bus. The device is accessed by chip select (/CS) with read and write control timing provided by either /RD and /WR pulse (Intel CPU) or /DS with advanced R/W (Motorola CPU). Data can also be transmitted over a conventional 3 wire serial interface having CLK, data I/O and strobe. The V3021 has no busy states and there is no danger of a clock update while accessing. Supply current is typically 800nA at VDD = 3.0V. Battery operation is supported by complete functionality down to 2.0V. The oscillator stability is typically 0.3 ppm/V.
Solutions
·Utility meters
·Battery operated and portable equipment
·Consumer electronics
·White/brown goods
·Pay phones
·Cash registers
·Personal computers
·Programmable controller systems
·Data loggers
·Automotive electronics

特性 Features

·Supply current typically 800nA at 3V
·50ns access time with 50pF load capacitance
·Fully operational from 2.0V to 5.5V
·No busy states or danger of a clock update while accessing
·Serial communication on one line of a standard parallel data bus or over a conventional 3 wire serial interface
·Interface compatible with both Intel and Motorola
·Seconds, minutes, hours, day of month, month, year, week day and week number in BCD format
·Leap year and week number correction
·Time set lock mode to prevent unauthorized setting of the current time or date
·Oscillator stability 0.3 ppm/volt
·No external capacitor needed
·Frequency measurement and test modes
·Temperature range - 40 to +85°C
·On request extented temperature range -40 to +125°C
·Packages DIP8 and SO8

简介

V3021属于集成电路（IC）的实时时钟。由制造生产的V3021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。