5 Volt, Byte Alterable E2PROM The X28C256D is a 256K (32K x 8) CMOS EEPROM manufactured by XICOR. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Density:** 256Kbit (32K x 8)
- **Technology:** CMOS EEPROM
- **Operating Voltage:** 5V ±10%
- **Access Time:** 120ns, 150ns, and 200ns variants
- **Endurance:** 100,000 write cycles per byte
- **Data Retention:** 100 years
- **Operating Temperature Range:**
- Commercial: 0°C to +70°C
- Industrial: -40°C to +85°C
- **Package Options:**
- 28-pin DIP (Dual In-line Package)
- 28-pin PLCC (Plastic Leaded Chip Carrier)
- 28-pin SOIC (Small Outline IC)
### **Descriptions:**
- The X28C256D is a byte-alterable EEPROM with a standard parallel interface.
- It supports both read and write operations with a simple microprocessor-compatible interface.
- Features a software data protection mechanism to prevent accidental writes.
- Fully compatible with JEDEC standards for pinout and functionality.
### **Features:**
- **Low Power Consumption:**
- Active Read Current: 30mA (max)
- Standby Current: 100µA (max)
- **Fast Write Cycle Time:**
- Byte Write: 5ms (max)
- Page Write (optional): Faster sequential writes
- **Hardware & Software Protection:**
- Write Protect Pin (WP) for hardware protection
- Software-controlled data protection
- **High Reliability:**
- Built-in error correction for enhanced data integrity
- Self-timed write cycle with auto-clear
- **Direct Replacement:**
- Compatible with other 5V 256K EEPROMs
This information is based solely on the X28C256D datasheet from XICOR.
