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Manufacturer Part #


25LC640 Series 64 Kbit (8K x 8) 5.5 V SMT SPI Bus Serial EEPROM - SOIC-8

ECAD Model:
Mfr. Name: Microchip
Standard Pkg:
Product Variant Information section
Date Code: 2309
Product Specification Section
Microchip 25LC640T-I/SN - Technical Attributes
Attributes Table
Memory Density: 64kb
Memory Organization: 8 K x 8
Supply Voltage-Nom: 2.5V to 5.5V
Clock Frequency-Max: 2MHz
Write Cycle Time-Max (tWC): 5ms
Package Style:  SOIC-8
Mounting Method: Surface Mount
Features & Applications

The 25LC640 (25XX640*) are 64 kbit Serial Electrically Erasable PROMs. The memory is 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(bar)] input.

Communication to the device can be paused via the hold pin [HOLD(bar)]. 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. The 25XX640 is available in standard packages including 8-lead PDIP and SOIC, and advanced packaging including 8-lead MSOP, 8-lead TSSOP, DFN and TDFN.


  • Max. Clock 10 MHz
  • Low-Power CMOS Technology
    • Max. Write Current: 5 mA at 5.5 V, 10 MHz
    • Read Current: 5 mA at 5.5 V, 10 MHz
    • Standby Current: 1 μA at 5.5 V
  • 8192 x 8-bit Organization
  • 32 Byte Page
  • Self-Timed Erase and Write Cycles (5 ms max.)
  • Block Write Protection
    • Protect none, 1/4, 1/2 or all of array
  • Built-In Write Protection
    • Power-on/off data protection circuitry
    • Write enable latch
    • Write-protect pin
  • Sequential Read
  • High Reliability
    • Endurance: 1,000,000 erase/write cycles
    • Data retention: > 200 years
    • ESD protection: > 4000 V
  • Temperature Ranges Supported:
    • Industrial (I): -40°C to +85°C
    Pricing Section
    Global Stock:
    Germany (Online Only):
    Factory Stock:Factory Stock:
    Factory Lead Time:
    5 Weeks
    Minimum Order:
    Multiple Of:
    Web Price
    Product Variant Information section