The TCD2255D is a high sensitive and low dark current 2700 elements? line CCD color image sensor which includes CCD drive circuit, clamp circuit and sample & hold circuit. The TCD2255D is a CCD (Charge-Coupled Device) linear image sensor manufactured by Toshiba. Below are its specifications, descriptions, and features based on available factual information:

### **Specifications:**  
- **Type:** Linear CCD Image Sensor  
- **Number of Pixels:** 5,000 (effective)  
- **Pixel Size:** 7 µm (H) × 7 µm (V)  
- **Total Pixels:** 5,340 (includes dummy pixels)  
- **Optical Black (OB) Pixels:** 64 (32 on each side)  
- **Outputs:** 2 channels (for high-speed readout)  
- **Clock Frequency (Max):** 20 MHz  
- **Supply Voltage:** 12 V (typical)  
- **Sensitivity:** High sensitivity with low noise  
- **Package:** Ceramic DIP (Dual In-line Package)  

### **Descriptions:**  
- Designed for high-speed scanning applications such as document scanners, facsimile machines, and industrial inspection systems.  
- Features a dual-output architecture for faster data transfer.  
- Includes built-in optical black pixels for dark-level reference.  
- Operates with a single-phase clock for simplified driving circuitry.  

### **Features:**  
- **High Resolution:** 5,000 effective pixels for detailed imaging.  
- **Low Noise:** Optimized for high signal-to-noise ratio (SNR).  
- **High-Speed Readout:** Dual outputs enable fast scanning.  
- **Wide Dynamic Range:** Suitable for varying light conditions.  
- **Compact Design:** Ceramic DIP package ensures durability.  

For exact electrical characteristics and timing diagrams, refer to the official Toshiba datasheet.

The TCD2255D is a high sensitive and low dark current 2700 elements? line CCD color image sensor which includes CCD drive circuit, clamp circuit and sample & hold circuit.