MICROCHIP 25LC640 Serial EEPROM 64Kbit DIP8

The MICROCHIP 25LC640 is a 64kB serial Electrically Erasable Programmable Read-Only Memory (EEPROM) accessed via a simple Serial Peripheral Interface (SPI) compatible serial bus. The bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a chip select (CS) input, and communication can be paused via the hold pin (HOLD). While the device is paused, transitions on its inputs will be ignored, with the exception of chip select, allowing the host to service higher priority interrupts.

Key Features

• Low-power CMOS technology
• Write cycle time - 5ms maximum
• Self-timed erase and write cycles
• Block write protection - Protect none, 1/4, 1/2, or all of array
• Built-in write protection featuring a write-protect pin and write enable latch
• Power-on/off data protection circuitry
• Sequential read capability
• High reliability: Data retention > 200 years and ESD protection > 4000V

Designed for through-hole mounting, this EEPROM comes in an 8-pin DIP package. It operates within a supply voltage range of 2.5V to 5.5V and functions reliably in temperatures from -40°C to 85°C. The component has dimensions of 43 mm in height, 33 mm in width, and 15 mm in depth, with a weight of just 0.001 grams, making it highly suitable for dense circuit board layouts.