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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：Non-Volatile
- Memory Format：EEPROM
- Technology：EEPROM
- Memory Size：64Kbit
- Memory Organization：8K x 8
- Memory Interface：SPI
- Clock Frequency：10 MHz
- Write Cycle Time - Word, Page：5ms
- Voltage - Supply：2.5V ~ 5.5V
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：8-TSSOP
- Access Time：-
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 25LC640AT-I/ST is a 64-Kbit (8192 x 8-bit) Serial Electrically Erasable PROM featuring SPI-compatible communication. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 10 MHz at higher voltages. The device utilizes an 8-lead TSSOP package with tape-and-reel packaging, indicated by the 'T' suffix. It functions within an industrial temperature range of -40°C to +85°C.
Feature Summary
- Supports high-speed serial data transfer via SPI interface with hold functionality for bus pausing
- Includes hardware write protection mechanisms and block-level array protection
- Features self-timed erase and write cycles with internal write enable latch
Applications
- Microcontroller system data storage
- Configuration parameter retention
- Calibration value storage
Procurement Notes
Verify the specific ordering suffix against official documentation to confirm package type and temperature grade. Ensure the supply voltage requirements align with the target application's power rails. Confirm that the industrial temperature range meets environmental specifications. Check datasheet revisions for any recent changes to pinout or electrical characteristics before finalizing procurement.
Selection Notes
Select this component when a non-volatile memory solution with SPI interface is required for industrial environments. The 64Kb capacity suits applications needing moderate data retention. Verify compatibility with host controller SPI modes. Consider the page write size limitations during software design to ensure efficient data management across physical page boundaries.
Part Context
This part belongs to the 25LC640A family of 64-Kbit Serial EEPROMs from Microchip Technology. The 'I' designation indicates the industrial temperature range variant. The 'ST' suffix specifies the 8-lead TSSOP package configuration. This series provides low-power CMOS technology suitable for battery-operated devices requiring reliable data storage.
Replacement Considerations
The 25AA640A series offers similar functionality but supports a wider voltage range starting at 1.8V. Verify voltage compatibility if replacing in existing designs. Other packages like SOIC or MSOP are available within the same family for different board layout requirements.
