M48T212YSH中文资料意法半导体数据手册PDF规格书

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)