| Part Number | MCP795W20T-I/SL | MCP795W21T-I/SL | 
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | 
| Category | Clock/Timing - Real Time Clocks | Clock/Timing - Real Time Clocks | 
|   |   | |
| Product Status | Active | Active | 
| Type | Clock/Calendar | Clock/Calendar | 
| Features | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Watchdog Timer | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | 
| Memory Size | 64B | 64B | 
| Time Format | HH:MM:SS:hh (12/24 hr) | HH:MM:SS:hh (12/24 hr) | 
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | 
| Interface | SPI | SPI | 
| Voltage - Supply | 1.8V ~ 3.6V | 1.8V ~ 3.6V | 
| Voltage - Supply, Battery | 1.3V ~ 3.6V | 1.3V ~ 3.6V | 
| Current - Timekeeping (Max) | 1µA @ 1.8V ~ 5.5V | 1µA @ 1.8V ~ 5.5V | 
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | 
| Supplier Device Package | 14-SOIC | 14-SOIC |