描述 Description

The M48T02/12 TIMEKEEPER?RAM is a 2 Kb x 8 non-volatile static RAM and real-time clock which is pin and functional compatible with the DS1642.

A special 24-pin, 600 mil DIP CAPHAT?package houses the M48T02/12 silicon with a quartz crystal and a long life lithium button cell to form a highly integrated battery-backed memory and real-time clock solution.

The M48T02/12 button cell has sufficient capacity and storage life to maintain data and clock functionality for an accumulated time period of at least 10 years in the absence of power over the operating temperature range.

The M48T02/12 is a non-volatile pin and function equivalent to any JEDEC standard 2 Kb x 8 SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the non-volatility of PROMs without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed.

特性 Features

? Integrated, ultra low power SRAM, real-time clock, and power-fail control circuit
? BYTEWIDE?RAM-like clock access
? BCD coded year, month, day, date, hours, minutes, and seconds
? Typical clock accuracy of ±1 minute a month, at 25 °C
? Software controlled clock calibration for high accuracy applications
? Automatic power-fail chip deselect and WRITE protection
? WRITE protect voltages (VPFD= power-fail deselect voltage):
?M48T02: VCC= 4.75 to 5.5 V; 4.5 V ≤ VPFD≤ 4.75 V
?M48T12: VCC= 4.5 to 5.5 V; 4.2 V ≤ VPFD≤ 4.5 V
? Self-contained battery and crystal in the CAPHAT?DIP package
? Pin and function compatible with JEDEC standard 2 K x 8 SRAMs
? RoHS compliant
?Lead-free second level interconnect

簡介

M48T12屬于集成電路（IC）的實時時鐘。由制造生產(chǎn)的M48T12實時時鐘實時時鐘 (RTC) 為幾乎所有需要保持精確時間的電子設(shè)備提供時間和/或日期信息。時鐘類型有二進制計數(shù)器、時鐘/日歷/監(jiān)控器、歷時計時器、幻時鐘芯片、便攜式系統(tǒng)控制器、溫度記錄器、時間事件記錄器和計時器時鐘外設(shè)。其包含 2 B 至 2 MB 不等的存儲器，接口選項有 I2C、并行、串行、SPI、1 線式、2 線式、3 線式和 4 線式。