SUMMARY DESCRIPTION

The M48T59/Y/V TIMEKEEPER® RAM is an 8 Kb x8 non-volatile static RAM and real time clock. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.

FEATURES SUMMARY

■ INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL

CONTROL CIRCUIT, AND BATTERY

■ FREQUENCY TEST OUTPUT FOR REAL

TIME CLOCK SOFTWARE CALIBRATION

■ AUTOMATIC POWER-FAIL CHIP

DESELECT AND WRITE PROTECTION

■ WRITE PROTECT VOLTAGES

(VPFD = Power-fail Deselect Voltage):

– M48T59: VCC = 4.75 to 5.5V

4.5V ≤ VPFD ≤ 4.75V

– M48T59Y: VCC = 4.5 to 5.5V

4.2V ≤ VPFD ≤ 4.5V

– M48T59V*: VCC = 3.0 to 3.6V

2.7V ≤ VPFD ≤ 3.0V

■ SELF-CONTAINED BATTERY AND

CRYSTAL IN THE CAPHAT™ DIP

PACKAGE

■ PACKAGING INCLUDES A 28-LEAD SOIC

AND SNAPHAT® TOP (to be ordered

separately)

■ SOIC PACKAGE PROVIDES DIRECT

CONNECTION FOR A SNAPHAT TOP

WHICH CONTAINS THE BATTERY AND

CRYSTAL

■ MICROPROCESSOR POWER-ON RESET

(Valid even during battery back-up mode)

■ PROGRAMMABLE ALARM OUTPUT

ACTIVE IN THE BATTERY BACK-UP MODE

■ BATTERY LOW FLAG

M48T59Y属于集成电路（IC） > 实时时钟。意法半导体（ST）集团制造生产的M48T59Y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。