Description:
The Microchip Technology Inc. 23X640 are 64 Kbit Serial SRAM devices. 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) input.

FEATUREs:
• Max. Clock 20 MHz
• Low-Power CMOS Technology:
    - Read Current: 3 mA at 1 MHz
    - Standby Current: 4 μA Max. at +85°C
• 8192 x 8-bit Organization
• 32-Byte Page
• HOLD pin
• Flexible Operating modes:
    - Byte read and write
    - Page mode (32 Byte Page)
    - Sequential mode
• Sequential Read/Write
• High Reliability
• Temperature Ranges Supported:
    - Industrial (I): -40°C to +85°C
    - Automotive (E): -40°C to +125°C
• Pb-Free and RoHS Compliant, Halogen Free