DESCRIPTION

The M48T212Y/V are self-contained devices that include a real time clock (RTC), programmable alarms, a watchdog timer, and two external chip enable outputs which provide control of up to four (two in parallel) external low-power static RAMs.

FEATURES SUMMARY

■ INTEGRATED REAL TIME CLOCK,

POWERFAIL CONTROL CIRCUIT, BATTERY AND

CRYSTAL

■ CONVERTS LOW POWER SRAM INTO

NVRAMs

■ YEAR 2000 COMPLIANT (4-Digit Year)

■ BATTERY LOW FLAG

■ MICROPROCESSOR POWER-ON RESET

■ PROGRAMMABLE ALARM OUTPUT

ACTIVE IN THE BATTERY BACKED-UP

MODE

■ WATCHDOG TIMER

■ AUTOMATIC POWER-FAIL CHIP

DESELECT AND WRITE PROTECTION

■ CHOICE OF WRITE PROTECT VOLTAGES

(VPFD = Power-fail Deselect Voltage):

– M48T212Y: VCC = 4.5 to 5.5V

4.2V ≤ VPFD ≤ 4.5V

– M48T212V: VCC = 3.0 to 3.6V

2.7V ≤ VPFD ≤ 3.0V

■ PACKAGING INCLUDES A 44-LEAD SOIC

AND SNAPHAT? TOP (to be ordered

separately)

M48T212V屬于集成電路（IC） > 實時時鐘。意法半導(dǎo)體（ST）集團制造生產(chǎn)的M48T212V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。