M48T201V Datasheet - STMicroelectronics

Description
The M48T201Y/V are self-contained devices that include a real time clock (RTC), programmable alarms, a watchdog timer, and a square wave output which provides control of up to 512 K x 8 of external low-power static RAM. Access to all RTC functions and the external RAM is the same as conventional bytewide SRAM. The 16 TIMEKEEPER® registers offer year, month, date, day, hour, minute, second, calibration, alarm, century, watchdog, and square wave output data. Externally attached static RAMs are controlled by the M48T201Y/V via the GCON and ECON signals.

FEATUREs
■ Converts low power SRAM into NVRAMs
■ Year 2000 compliant
■ Battery low flag
■ Integrated real time clock, power-fail control circuit, battery and crystal
■ Watchdog timer
■ Choice of write protect voltages (VPFD = power-fail deselect voltage):
    – M48T201Y: VCC = 4.5 to 5.5 V 4.1V ≤ VPFD ≤ 4.5 V
    – M48T201V: VCC = 3.0 to 3.6 V 2.7 V ≤ VPFD ≤ 3.0 V
■ Microprocessor power-on reset (valid even during battery backup mode)
■ Programmable alarm output active in the battery backed-up mode
■ Packaging includes a 44-lead SOIC and SNAPHAT® top (to be ordered separately)
■ SOIC package provides direct connection for a SNAPHAT® top which contains the battery and crystal
■ RoHS compliant
    – Lead-free second level interconnect