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