| PartNumber | CAT1021ZI-30-GT3 | CAT1021ZI-25-GT3 | CAT1021ZI-28-GT3 |
| Description | Supervisory Circuits CPU SUP W/2K EEPROM | Supervisory Circuits CPU SUP W/2K EEPROM | Supervisory Circuits CPU SUP W/2K EEPROM |
| Manufacturer | ON Semiconductor | ON Semiconductor | ON Semiconductor |
| Product Category | PMIC - Supervisors | PMIC - Supervisors | PMIC - Supervisors |
| Series | CAT1021 | CAT1021 | - |
| Type | Simple Reset/Power-On Reset | Simple Reset/Power-On Reset | Simple Reset/Power-On Reset |
| Packaging | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) |
| Unit Weight | 0.004938 oz | 0.004938 oz | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package Case | MSOP-8 | MSOP-8 | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Output Type | Open Collector / Drain | Open Collector / Drain | - |
| Supplier Device Package | 8-MSOP | 8-MSOP | 8-MSOP |
| Output | Open Drain or Open Collector | Open Drain or Open Collector | Open Drain or Open Collector |
| Reset | Active High/Active Low | Active High/Active Low | Active High/Active Low |
| Number of Voltages Monitored | 1 | 1 | 1 |
| Reset Timeout | 130 ms Minimum | 130 ms Minimum | 130 ms Minimum |
| Voltage Threshold | 3V | 2.55V | 2.85V |
| Pd Power Dissipation | 1 W | 1 W | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Operating Supply Current | - 2 uA to + 10 uA | - 2 uA to + 10 uA | - |
| Supply Voltage Max | 7 V | 7 V | - |
| Supply Voltage Min | - 2 V | - 2 V | - |
| Watchdog Timers | No Watchdog | No Watchdog | - |
| Number of Inputs Monitored | 1 Input | 1 Input | - |
| Manual Reset | Manual Reset | Manual Reset | - |
| Power Fail Detection | No | No | - |
| Reset Delay Time | 5 us | 5 us | - |
| Undervoltage Threshold | 3 V to 3.15 V | 2.55 V to 2.7 V | - |