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Product Detailed Parameters
- Description：IC EEPROM 64KBIT SPI 8MSOP
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR),Cut Tape (CT)
- Memory Type：-
- Memory Format：EEPROM
- Technology：-
- Memory Size：64Kbit
- Memory Organization：8K x 8
- Memory Interface：SPI
- Clock Frequency：20 MHz
- Write Cycle Time - Word, Page：-
- Voltage - Supply：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Access Time：-
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 25CS640T-I/MS is a 64-Kbit (8,192 x 8 bit) SPI Serial EEPROM housed in an 8-lead MSOP package. It operates within a voltage range of 1.7V to 5.5V and supports clock frequencies up to 20 MHz at VCC ≥ 4.5V. The device features a factory-programmed 128-bit serial number, user-programmable lockable ID pages, and built-in Error Correction Code logic. It includes legacy and enhanced write protection modes, undervoltage lockout detection, and AEC-Q100 automotive qualification.
Feature Summary
- Integrated Security Register with preprogrammed 128-bit unique serial number and 32-byte user-programmable lockable ID page
- Built-in Error Correction Code logic capable of correcting single-bit errors within four-byte readouts
- Configurable Enhanced Write Protection Mode allowing independent memory partitioning with unique protection behaviors
- Programmable Undervoltage Lockout Detection circuit to inhibit write sequences during brown-out events
Applications
- Automotive systems requiring AEC-Q100 qualified nonvolatile storage
- Industrial applications needing reliable data retention and high write endurance
- Consumer electronics utilizing SPI-compatible bus interfaces for configuration storage
Procurement Notes
Verify the 'I' suffix confirms Industrial temperature range (-40°C to +85°C). Confirm 'T' indicates tape and reel packaging. Ensure the 'MS' suffix matches the required 8-lead MSOP package type. Cross-reference the datasheet revision DS20005943D for accurate electrical specifications.
Selection Notes
Select this component when backward compatibility with 25AA640A/25LC640A or AT25C640B is required. Choose the 25CS640 for applications demanding enhanced security via unique serial numbers and flexible partition-based write protection. Consider the ECC feature for environments where data integrity is critical without external error handling.
Part Context
The 25CS640 belongs to Microchip's 25XXX series of SPI Serial EEPROMs. It serves as an enhanced successor to legacy devices like the 25AA640A, adding significant value through integrated security registers and advanced write protection schemes while maintaining pin and software compatibility with standard industry protocols.
Replacement Considerations
The datasheet explicitly states backward compatibility with the 25AA640A, 25LC640A, and AT25C640B. These parts can be substituted directly if enhanced features are not utilized.
