VT82887 - VIA

VT82887 Real Time Clock

The VT82887 Real Time Clock is designed to be a direct replacement for the DS12887. The VT82887 is identical in form, fit and function to the DS12887. It has 114 bytes of general purpose RAM. Access to this RAM space is OPERATION determined by the logic level presented on AD6 during the address portion of an access cycle. An external crystal and battery are.

Features

• Drop-in replacement for IBM AT computer clock/calendar.
• Pin configuration closely matches the DS12887
• Totally nonvolatile with over 10 years of operation in the absence of power
· Self-contained subsystem includes lithium, quartz and support circuitry
• Counts seconds, minutes, hours, days, day of the week, date, month and year with leap year compensation
• Binary or BCD representation of time, calendar and alarm
• 12- or 24-hour clock with AM and PM in 12hour mode
• Daylight Savings Time option
• Intel bus timing
• Multiplex bus for pin efficiency
• Interfaced with software as 128 RAM l.