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| Part Number | MCP79400T-I/ST | MCP7940NT-I/ST | MCP79410T-I/ST | MCP7940MT-I/ST | MCP79401T-I/ST | MCP79402T-I/ST | MCP79400-I/ST | MCP79400T-I/SN | 
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | 
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | 
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | 
| Features | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | Alarm, Leap Year, Square Wave Output, SRAM | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | Alarm, Leap Year, Square Wave Output, SRAM | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | 
| Memory Size | 64B | 64B | 64B, 1Kb | 64B | 64B | 64B | 64B | 64B | 
| Time Format | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | 
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | 
| Interface | I²C, 2-Wire Serial | I²C, 2-Wire Serial | I²C, 2-Wire Serial | I²C, 2-Wire Serial | I²C, 2-Wire Serial | I²C, 2-Wire Serial | I²C, 2-Wire Serial | I²C, 2-Wire Serial | 
| Voltage - Supply | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 
| Voltage - Supply, Battery | 1.3V ~ 5.5V | 1.5V ~ 5.5V | 1.3V ~ 5.5V | - | 1.3V ~ 5.5V | 1.3V ~ 5.5V | 1.3V ~ 5.5V | 1.3V ~ 5.5V | 
| Current - Timekeeping (Max) | 1.2µA (Typ) @ 3.3V | 1.2µA @ 3.3V | 1.2µA @ 3.3V | 1µA @ 5.5V | 1.2µA (Typ) @ 3.3V | 1.2µA (Typ) @ 3.3V | 1.2µA (Typ) @ 3.3V | 1.2µA (Typ) @ 3.3V | 
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-SOIC (0.154", 3.90mm Width) | 
| Supplier Device Package | 8-TSSOP | 8-TSSOP | 8-TSSOP | 8-TSSOP | 8-TSSOP | 8-TSSOP | 8-TSSOP | 8-SOIC |