5 Volt, Byte Alterable E2PROM The **X28HC256KM-12** is a high-speed CMOS EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **Xicor**. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Memory Size:** 256 Kbit (32K x 8-bit)
- **Technology:** High-speed CMOS
- **Access Time:** 120 ns
- **Operating Voltage:** 5V ±10%
- **Operating Temperature Range:**
- Commercial: 0°C to +70°C
- Industrial: -40°C to +85°C
- **Endurance:** 100,000 write cycles per byte
- **Data Retention:** 100 years
- **Package:** 28-pin PLCC (Plastic Leaded Chip Carrier)
### **Descriptions:**
- The **X28HC256KM-12** is a byte-erasable EEPROM with a fast read access time of 120 ns.
- It supports **in-system programming**, allowing for easy firmware updates without removing the chip.
- Features a **page write mode** for faster programming (up to 32 bytes at a time).
- Includes **software data protection** to prevent accidental writes.
### **Features:**
- **High-Speed Read Operation:** 120 ns access time.
- **Low Power Consumption:**
- Active current: 30 mA (typical)
- Standby current: 100 µA (typical)
- **Hardware & Software Write Protection:** Prevents unintended data corruption.
- **Page Write Mode:** Allows faster programming in 32-byte blocks.
- **Self-Timed Write Cycle:** No external timing components required.
- **CMOS Technology:** Ensures low power and high noise immunity.
- **JEDEC Standard Pinout:** Compatible with other 28-pin EEPROMs.
This device is commonly used in applications requiring non-volatile memory storage, such as embedded systems, industrial controls, and telecommunications equipment.
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