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