MCP7940M-I/MS Microchip Integrated Circuit (Small Outline Packages) In Stock
MCP7940M-I/MS is a Microchip real-time clock and calendar IC in an 8-pin MSOP package, featuring I2C serial interface at 32 kHz, 64-byte SRAM, and interrupt output for low-power timekeeping applications.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP7940M-I/MS Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5800(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- I2C serial interface operating at 32.768 kHz crystal frequency for accurate real-time clock and calendar functions
- 64-byte general-purpose SRAM for non-volatile data storage alongside timekeeping registers in a single 8-pin device
- Interrupt output pin enabling alarm-triggered wake-up events in low-power embedded systems
Applications
The MCP7940M-I/MS is designed for battery-backed timekeeping in data loggers, smart metering, and IoT edge nodes that require accurate real-time clock and calendar functions via a 2-wire I2C bus. Its 64-byte on-chip SRAM provides convenient scratchpad storage for configuration parameters alongside the timekeeping registers. The 8-pin MSOP package minimizes PCB area, making it an efficient choice for portable instruments and wearable devices.
Specifications
| Manufacturer Package Code | MSOP-8 |
| Factory Lead Time | 11Weeks |
| YTEOL | 13 |
| Clock Frequency-Max | 0.032MHz |
| Information Access Method | SERIAL(I2C) |
| Interrupt Capability | Y |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| On Chip Data RAM Width | 8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.19 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE |
| Qualification Status | Not Qualified |
| RAM (words) | 64 |
| Screening Level | TS 16949 |
| Supply Current-Max | 0.4mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 2.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time-Min | SECONDS |
| Volatile | YES |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP7940M-I/MS:
Frequently Asked Questions
What communication interface does the MCP7940M-I/MS use and at what frequency does it operate?
The MCP7940M-I/MS uses an I2C (2-wire) serial interface with a 32.768 kHz crystal reference oscillator for timekeeping. The I2C bus supports standard 100 kHz and fast 400 kHz modes, enabling straightforward integration with microcontrollers in data logging and scheduling applications.
How much on-chip SRAM does the MCP7940M-I/MS provide and how is it useful?
The MCP7940M-I/MS includes 64 bytes of general-purpose SRAM accessible over the I2C bus. This non-volatile scratchpad is useful for storing calibration coefficients, device configuration settings, or event counters alongside the real-time clock registers without requiring an external EEPROM.
For a compact wearable design, what are the physical dimensions of the MCP7940M-I/MS MSOP-8 package?
The 8-pin MSOP package used by the MCP7940M-I/MS has a body size of approximately 3.0 mm × 3.0 mm with 0.65 mm lead pitch, occupying significantly less PCB area than a standard 8-pin SOIC and making it well suited for small wearable or portable device boards.
Does the MCP7940M-I/MS support alarm interrupts and how can they reduce system power consumption?
Yes, the MCP7940M-I/MS has an interrupt capability output pin that can generate a hardware alarm signal. A microcontroller can enter a deep-sleep mode between scheduled events and rely on the MCP7940M interrupt to wake it up at the programmed time, cutting average power draw to microamp levels.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.7100 | $0.71 |
| 25+ | $0.6800 | $17.00 |
| 50+ | $0.6590 | $32.95 |
| 100+ | $0.6200 | $62.00 |
| 1000+ | $0.5900 | $590.00 |
| 5000+ | $0.5800 | $2900.00 |
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