DS12C887+
₹1,350.00
The real-time clocks (RTCs) DS12885, DS12887, and DS12C887 are intended to be straight replacements for the DS1285 and DS1287. The devices have a real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a shared interrupt output, a programmable square wave, and 114 bytes of battery-backed static RAM (113 bytes in the DS12C887 and DS12C887A). In a 24-pin enclosed DIP device, the DS12887 incorporates a quartz crystal and a lithium energy supply. At address 32h, the DS12C887 adds a century byte. For all devices, the end-of-month date is automatically modified for months with fewer than 31 days, including leap years. The devices can also be set to operate in 24-hour or 12-hour mode and have an AM/PM indicator. The status of VCC is monitored using a precision temperature-compensated circuit. If the primary power supply fails, the device immediately switches to a backup supply. When primary power is not available, a lithium coin-cell battery can be attached to the DS12885’s VBAT input pin to keep the time and date running. The device is addressed via a multiplexed byte-wide interface that supports both Intel and Motorola modes of operation.
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