| BQ4285 Description | | RTC IC With 114x8 NVSRAM and NVSRAM Control | | BQ4285 Vendor | | Texas Instruments | | BQ4285 Categories | | | BQ4285 Features | - Direct clock/calendar replacement for IBM® AT-compatible computers and other applications
- Functionally compatible with the DS1285
- Closely matches MC146818A pin configuration
- 114 bytes of general nonvolatile storage
- Automatic backup and write-protect control to external SRAM
- 160 ns cycle time allows fast bus operation
- Less than 0.5µA load under battery operation
- 14 bytes for clock/calendar and control
- Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
- Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
- BCD or binary format for clock and calendar data
- Programmable square wave out-put
- Three individually maskable interrupt event flags:
- Periodic rates from 122 us to 500 ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
- 24-pin plastic DIP or SOIC
| | BQ4285 Datasheet and Application Notes | | | Parameter | Value | | Supply Voltage (V) | 5 | | Bus Interface | Multiplexed | | Memory Density (Kb) | 0.114 | | Pin/Package | 24PDIP,24SOIC | | Approx. 1KU Price (US$) | 2.35 | | Products related to BQ4285 | | BQ4285S-SB2 BQ4285S-SB2TR BQ4285P-SB2 |
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