BQ3287AMT - Benchmarq BQ3287AMT - Real-Time Clock (RTC) Module Simple Type: Accessory
- Part Number:
- BQ3287AMT
- Model Number:
- BQ3287AMT
- Make:
- BENCHMARQ
- Lead Time:
- Available
- Qty In Stock:
- Available
Benchmarq BQ3287AMT - Real-Time Clock (RTC) Module Simple Type: Accessory
The CMOS bq3287/bq3287A is a low-power microprocessor periph eral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of gen eral nonvolatile storage. The bq3287A version is identical to the bq3287, with the addition of the RAM clear input. The bq3287 is a fully compatible real-time clock for IBM AT compatible computers and other applications. The bq3287 write protects the clock, calendar, and storage registers during power failure. The integral backup energy source then maintains data and operates the clock and calendar. As shipped from Benchmarq, the real time clock is turned off to maximize battery capacity for in-system operation. The bq3287 is functionally equivalent to the bq3285, except that the battery (16, 20) and crystal (2, 3) pins are not accessible. These pins are connected internally to a coin cell and quartz crystal. The coin cell is sized to provide 10 years of data retention and clock operation in the absence of power. For a complete description of features, operating conditions, electrical characteristics, bus timing, and pin descriptions.
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Features
- 114 bytes of general nonvolatile storage
- 14 bytes for clock/calendar and control
- 160 ns cycle time allows fast bus operation
- BCD or binary format for clock and calendar data
- Direct clock/calendar replacement for IBM® AT-compatible computers and other applications
- Functionally compatible with the DS1287/DS1287A andMC146818A
- Integral lithium cell and crystal
- Selectable Intel or Motorola bus timing
- Time of day in seconds, minutes, and hours
Specifications
- Date Format: DW:DM:M:Y, Binary
- Maximum Operating Temperature: + 70 C
- Minimum Operating Temperature: - 20 C
- RTC Memory Size: 114 B
- Supply Voltage (Max): 5.5 V
- Supply Voltage (Min): 4.5 V
- Time Format: HH:MM:SS, Binary
Applications
- None Available
Aliases
- None Available
