5 Volt, Byte Alterable E2PROM The X28C256 is a 256Kbit (32K x 8) CMOS EEPROM manufactured by XICOR. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Organization:** 32K x 8
- **Density:** 256Kbit
- **Supply Voltage:** 5V ±10%
- **Access Time:** 70ns, 90ns, 120ns, 150ns, 200ns
- **Operating Current:** 30mA (typical)
- **Standby Current:** 100μA (typical)
- **Endurance:** 100,000 write cycles (minimum)
- **Data Retention:** 100 years (minimum)
- **Package Options:** 28-pin PDIP, PLCC, SOIC, TSOP
### **Descriptions:**
- The X28C256 is a high-performance, byte-alterable EEPROM with a 5V-only operation.
- It features a fast write cycle time (200ns typical) and supports both parallel and page-mode writes.
- The device includes an internal write control circuit for simplified interfacing with microprocessors.
### **Features:**
- **Fast Read Access Time:** Options from 70ns to 200ns.
- **Low Power Consumption:** 30mA active current, 100μA standby.
- **Page Write Mode:** Allows up to 64 bytes to be written in a single operation.
- **Hardware & Software Data Protection:** Prevents accidental writes.
- **Self-Timed Write Cycle:** No external timing components required.
- **CMOS Technology:** Ensures low power and high reliability.
- **JEDEC Standard Pinout:** Compatible with other 32K x 8 EEPROMs.
This information is based solely on the manufacturer's datasheet for the X28C256 by XICOR.
