MCP7940N-I/ST
ActiveALARM RTC IC, YEAR/MONTH/WEEK/DATE/HR/MIN/SEC 12HR / 24HR, I2C, 1.8 V TO 5.5 V, TSSOP-8
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MCP7940N-I/ST
ActiveALARM RTC IC, YEAR/MONTH/WEEK/DATE/HR/MIN/SEC 12HR / 24HR, I2C, 1.8 V TO 5.5 V, TSSOP-8
Technical Specifications
Parameters and characteristics for this part
| Specification | MCP7940N-I/ST |
|---|---|
| Current - Timekeeping (Max) | 1.2 µA |
| Features | Leap Year, Square Wave Output, SRAM, Alarm |
| Grade | Automotive |
| Interface | I2C, 2-Wire Serial |
| Memory Size | 64 B |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Package / Case | 8-TSSOP |
| Package / Case [custom] | 0.173 " |
| Package / Case [custom] | 4.4 mm |
| Qualification | AEC-Q100 |
| Supplier Device Package | 8-TSSOP |
| Time Format | HH:MM:SS (12/24 hr) |
| Type | Clock/Calendar |
| Voltage - Supply [Max] | 5.5 V |
| Voltage - Supply [Min] | 1.8 V |
| Voltage - Supply, Battery [Max] | 5.5 V |
| Voltage - Supply, Battery [Min] | 1.3 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tube | 1 | $ 0.90 | |
| 25 | $ 0.83 | |||
| 100 | $ 0.80 | |||
| Microchip Direct | TUBE | 1 | $ 0.90 | |
| 25 | $ 0.83 | |||
| 100 | $ 0.79 | |||
| 1000 | $ 0.74 | |||
| 5000 | $ 0.71 | |||
| Newark | Each | 1 | $ 0.94 | |
| 10 | $ 0.90 | |||
| 25 | $ 0.86 | |||
| 50 | $ 0.85 | |||
| 100 | $ 0.83 | |||
Description
General part information
MCP7940N Series
The MCP7940N series of low-power Real-Time Clocks (RTC) uses digital timing compensation for an accurate clock/calendar, a programmable output control for versatility, and a power sense circuit that automatically switches to the backup supply. Using a low-cost 32.768
kHz crystal, it tracks time using several internal registers.
For communication, the MCP7940N uses the I2C™ bus. The clock/calendar automatically adjusts for months with fewer than 31 days, including corrections for leap years. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator and settable alarm(s) to the second, minute, hour, day of the week, date or month. Using the programmable CLKOUT, frequencies of 32.768, 8.192 and 4.096
Documents
Technical documentation and resources
