The X1242 is a Real Time Clock (RTC) with a calendar, alarms, and CPU supervisor circuits. It features a 2-wire interface, 16k (2k x 8) EEPROM, and a low voltage reset.

Key Features

Selectable watchdog timer, CPU power on reset, and low voltage reset.

2-wire interface with 400kHz data transfer rate.

2Kbytes of EEPROM with 64-byte page write mode and single byte write capability.

Backup power input pin for non-rechargeable battery backup.

Operational from 1.8 to 5.5 volts.

Real Time Clock Operation

Uses an external 32.768kHz quartz crystal to maintain an accurate internal representation of time.

Leap-year correction and century byte.

Corrects for months with fewer than 31 days.

24-hour or AM/PM format.


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