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| PartNumber | ISL12028IB27Z-T 12028IBZ | ISL12028IB27Z-T | ISL12028IB27Z |
| Description | Real Time Clock REAL TIME CLKRTC W/ EPROM 2 7VSET 14 L | Real Time Clock REAL TIME CLKRTC W/ EPROM 2 7VSET 14 | |
| Manufacturer | - | Intersil | Intersil |
| Product Category | - | Clock/Timing - Real Time Clocks | Clock/Timing - Real Time Clocks |
| Series | - | ISL12028 | ISL12028 |
| Product | - | Real Time Clocks | Real Time Clocks |
| Type | - | Clock/Calendar | Clock/Calendar |
| Packaging | - | Digi-ReelR Alternate Packaging | Tube Alternate Packaging |
| Mounting Style | - | SMD/SMT | SMD/SMT |
| Package Case | - | SOIC-Narrow-14 | SOIC-Narrow-14 |
| Operating Temperature | - | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount | Surface Mount |
| Features | - | Alarm, Leap Year, Supervisor, Watchdog Timer | Alarm, Leap Year, Supervisor, Watchdog Timer |
| Function | - | Alarm Calendar Clock Interrupt Timer | Alarm Calendar Clock Interrupt Timer |
| Interface | - | I2C, 2-Wire Serial | I2C, 2-Wire Serial |
| Voltage Supply | - | 2.7 V ~ 5.5 V | 2.7 V ~ 5.5 V |
| Supplier Device Package | - | 14-SOICN | 14-SOICN |
| Memory Size | - | - | - |
| Time Format | - | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) |
| Date Format | - | YY-MM-DD-dd | YY-MM-DD-dd |
| Voltage Supply Battery | - | 1.8 V ~ 5.5 V | 1.8 V ~ 5.5 V |
| Current Timekeeping Max | - | 10μA ~ 20μA @ 2.7V ~ 5.5V | 10μA ~ 20μA @ 2.7V ~ 5.5V |
| Maximum Operating Temperature | - | + 85 C | + 85 C |
| Minimum Operating Temperature | - | - 40 C | - 40 C |
| Battery Backup Switching | - | Backup Switching | Backup Switching |
| Supply Voltage Max | - | 5.5 V | 5.5 V |
| Supply Voltage Min | - | 2.7 V | 2.7 V |
| RTC Bus Interface | - | Serial (I2C) | Serial (I2C) |
| RTC Memory Size | - | 512 B | 512 B |