MCP7940N-I/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
MCP7940N-I/P is an I2C real-time clock and calendar IC with 64-byte SRAM from Microchip in an 8-pin PDIP package. It uses a 32.768 kHz crystal and communicates over I2C serial interface with interrupt output support. Available Pb-free in stock worldwide for datalogging, appliance, and embedded timekeeping designs.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP7940N-I/P Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.7400(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 at up to 400 kHz (Fast-mode) for direct connection to microcontrollers without additional logic, supporting multi-device bus sharing
- 64 bytes of battery-backed SRAM for storing calibration constants or event logs while the main supply is off
- 14-year YTEOL commitment and 8-week factory lead time supporting long-lifecycle industrial and appliance programs in familiar 8-pin PDIP package
Applications
MCP7940N-I/P provides accurate timekeeping in embedded systems such as data loggers, industrial controllers, and home appliances that require a real-time clock with calendar and alarm capability. Its 64-byte SRAM allows small parameter tables or event records to persist through power cycling when backed by a coin cell. The 8-pin PDIP package enables rapid prototyping and through-hole assembly for low-volume production runs or development boards.
Specifications
| Manufacturer Package Code | PDIP-8 |
| Factory Lead Time | 8Weeks |
| YTEOL | 14 |
| Clock Frequency-Max | 0.032MHz |
| Information Access Method | SERIAL(I2C) |
| Interrupt Capability | Y |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e3 |
| On Chip Data RAM Width | 8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| RAM (words) | 64 |
| Screening Level | AEC-Q100 |
| Supply Current-Max | 0.4mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 2.5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Time-Min | SECONDS |
| Volatile | YES |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP7940N-I/P:
Frequently Asked Questions
What serial interface does MCP7940N-I/P use, and at what maximum clock frequency can it communicate?
MCP7940N-I/P communicates over I2C at a maximum clock frequency of 400 kHz (Fast-mode I2C), compatible with most 3.3 V and 5 V microcontrollers including AVR, PIC, and ARM Cortex-M families. The 2-wire I2C interface requires only SCL and SDA lines plus pull-up resistors, minimizing the number of GPIO pins consumed by the RTC in pin-limited embedded designs.
How much on-chip RAM does MCP7940N-I/P include, and what data can be stored there during power loss?
MCP7940N-I/P includes 64 bytes of general-purpose SRAM with 8-bit data width. When a backup battery is connected, this SRAM retains its contents through main supply failures, allowing storage of small configuration tables, calibration offsets, or the last 16 timestamped event records in 4-byte entries. This eliminates a separate external EEPROM for many low-data-volume logging applications.
For a 14-year lifecycle industrial timer using MCP7940N-I/P, what crystal frequency is required externally?
MCP7940N-I/P requires an external 32.768 kHz crystal oscillator connected to its XTAL1 and XTAL2 pins for timekeeping. A standard 32.768 kHz tuning-fork crystal with 7 pF load capacitance and plus or minus 20 ppm accuracy is sufficient for most calendar applications, yielding a timekeeping error of less than 1 minute per month. The 14-year YTEOL rating ensures the IC remains available in production throughout a long industrial product program.
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