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Product Detailed Parameters
- Description：IC EEPROM 64KBIT SPI 8TSSOP
- 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 25CS640-I/ST is a 64-Kbit (8,192 x 8 bit) Serial EEPROM utilizing SPI-compatible bus communication. It features a 32-byte page size and supports byte or sequential reads and writes. The device operates within a voltage range of 1.7V to 5.5V, with clock frequencies up to 20 MHz at VCC ≥ 4.5V. It includes a Security Register with a preprogrammed 128-bit serial number and user-programmable ID page. Built-in ECC logic corrects single-bit errors per four-byte readout. The component offers legacy block protection and enhanced partition-based write protection modes. It is AEC-Q100 qualified for automotive applications and provides over four million erase/write cycles.
Feature Summary
- Integrated Error Correction Code (ECC) logic for increased data reliability
- Configurable Enhanced Write Protection Mode with independent memory partitions
- Factory-programmed globally unique 128-bit serial number in the Security Register
- Undervoltage Lockout Detection circuit to inhibit write sequences during brown-out events
Applications
- Automotive systems requiring reliable nonvolatile memory storage
- Industrial applications needing dependable data retention
- Consumer electronics requiring serialization and secure identification
Procurement Notes
Verify that the 'I' suffix confirms the Industrial temperature range (-40°C to +85°C). Confirm the '/ST' suffix corresponds to the 8-lead SOIC package type. Ensure the specific revision matches the required datasheet version DS20005943D. Cross-reference the JEDEC Manufacturer ID and Device ID if electronic identification is critical for the system design.
Selection Notes
Select this component when a 64-Kbit capacity is required alongside hardware-enforced security features. The built-in ECC and UVLO detection make it suitable for environments where power stability and data integrity are paramount. Consider the Enhanced Write Protection mode if complex, partition-specific access control is needed beyond standard block protection.
Part Context
The 25CS640 belongs to Microchip's CS series of Serial EEPROMs, designed for backward compatibility with devices like the 25AA640A and AT25C640B. It distinguishes itself through integrated security registers and advanced write protection schemes not found in standard EEPROMs. The device is optimized for high-reliability applications across consumer, industrial, and automotive sectors.
Replacement Considerations
The datasheet explicitly states backward compatibility with the 25AA640A, 25LC640A, and AT25C640B. Verify pinout and command set alignment before substitution. Note that the 25CS640 adds ECC and enhanced protection features absent in these legacy parts.
