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Dallas
DS1305 3-Wire/SPI Serial Interface Real-Time Clock
Photograph
Features
- Real-time clock counts seconds, minutes, hours, date, month, day, year, and leap year to 2100
- 96-byte, battery-backed, nonvolatile (NV) RAM for data storage
- Two time of day Alarms
- Serial interface SPI or standard 3-wire interface
- Dual-power supply pins for primary and backup power supplies
- Optional trickle charge output to Backup Supply
- Underwriters Laboratory (UL) Recognized
Pin Layout
Pin Description
| Pin Number | Description |
|---|---|
| 1 | Vcc2 - Backup Power Supply |
| 2 | Vbat - +3V Battery Input |
| 3 | X1 - 32.768kHz Crystal |
| 4 | X2 - 32.768kHz Crystal |
| 5 | NC - Not Connected |
| 6 | INT0 - Interrupt 0 Output |
| 7 | INT1 - Interrupt 1 Output |
| 8 | GND - Ground |
| 9 | SEMODE - Serial Interface Mode |
| 10 | CE - Chip Enable |
| 11 | SCLK - Serial Clock |
| 12 | SDI - Serial Data In |
| 13 | SDO - Serial Data Out |
| 14 | Vccif - Interface Logic Power Supply Input |
| 15 | PF - Power Fail Output |
| 16 | Vcc1 - Primary Power Supply |
Dimensional Drawing
Technical Data
