Характеристики
| Case style | MSOP |
| Temperature, operating range | -40°C to +85°C |
| Temp, op. max | 85°C |
| Temp, op. min | -40°C |
| Base number | 1221 |
| Calendar format | STD |
| Clock format | STD |
| Frequency, clock | 400kHz |
| Memory size | 2 Bytes |
| Memory type | SRAM |
| Pins, No. of | 10 |
| Voltage, Vcc | 5.5V |
ISL1221IUZRenesasReal Time Clocks