General Description
The HT93LC66 is a 4K-bit low voltage nonvolatile, serial electrically erasable programmable read only memory device using the CMOS floating gate process. Its 4096 bits of memory are organized into 256 words of 16 bits each when the ORG pin is connected to VCC or organized into 512 words of 8 bits each when it is tied to VSS. The device is optimized for use in many industrial and commercial applications where low power and low voltage operation are essential. By popular microcontroller, the versatile serial interface including chip select (CS), serial clock (SK), data input (DI) and data output (DO) can be easily controlled.

Features
• Operating voltage: 2.2V~5.5V
• Low power consumption
    - Operating: 5mA max.
    - Standby: 10μA max.
• User selectable internal organization
    - 4K(HT93LC66): 512x8 or 256x16
• 3-wire Serial Interface
• Write cycle time: 5ms max.
• Automatic erase-before-write operation
• Word/chip erase and write operation
• Write operation with built-in timer
• Software controlled write protection
• 10-year data retention
• 106 rewrite cycles per word
• Commercial temperature range (0°C to +70°C)
• 8-pin DIP/SOP/TSSOP package