VT82885

Features: · Drop-in replacement for IBM AT computer clock/calendar.· Pin configuration closely matches the DS12887, DS12885and DS12885Q· 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 alar...

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VT82885 Picture
SeekIC No. : 004543850 Detail

VT82885: Features: · Drop-in replacement for IBM AT computer clock/calendar.· Pin configuration closely matches the DS12887, DS12885and DS12885Q· Counts seconds, minutes, hours, days, day of the week, date, ...

floor Price/Ceiling Price

Part Number:
VT82885
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/2/22

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Product Details

Description



Features:

· Drop-in replacement for IBM AT computer clock/calendar.
· Pin configuration closely matches the DS12887, DS12885and DS12885Q
· 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 12-hour mode
· Daylight Savings Time option
· Intel bus timing
· Multiplex bus for pin efficiency
· Interfaced with software as 128 RAM locations
  - 14 bytes of clock and control registers
  - 114 bytes of general purpose RAM
· Programmable square wave output signal
· Bus-compatible interrupt signals (IRQ#)
· Three interrpts are separately softwaremaskable and testable
  - Times-of-day alarm once/second to once/day
  - Periodic rates from 122 ms to 500 ms
  - End of clock update cycle
· Optional 28-pin PLCC surface mount package



Pinout

  Connection Diagram


Specifications

VOLTAGE ON ANY PIN RELATIVE TO GROUND................... -0.3V TO +7.0V
OPERATING TEMPERATURE ..................................................0°C TO 70°C
STORAGE TEMPERATURE ................................................-40°C TO +70°C
SOLDERING TEMPERATURE ................................260°C FOR 10 SECONDS

*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.




Description

The VT82885 Real Time Clock is designed to be a direct replacement for the DS12885. The VT82885 is identical in form, fit and function to the DS12885. It has 114 bytes of general purpose RAM. Access to this RAM space is determined by the logic level presented on AD6 during the address portion of an access cycle. An external crystal and battery are the only components required to maintain time-of-day and memory status in the absence of power. A complete description of operating conditions, electrical characteristics, bus timing and pin descriptions follows.




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