5 Volt, Byte Alterable E2PROM The X28C256KM-25 is a 256Kb (32K x 8) CMOS EEPROM manufactured by Xicor. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Density:** 256Kb (32K x 8)
- **Technology:** CMOS EEPROM
- **Access Time:** 250 ns
- **Operating Voltage:** 5V ±10%
- **Operating Temperature Range:** Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
- **Endurance:** 100,000 write cycles (minimum)
- **Data Retention:** 100 years (minimum)
- **Package Options:** 28-pin PDIP, PLCC, or TSOP
### **Descriptions:**
- The X28C256KM-25 is a byte-erasable and programmable EEPROM.
- It features a fast read access time of 250 ns.
- Supports both parallel and page write operations.
- Includes built-in software and hardware data protection mechanisms.
### **Features:**
1. **Fast Read Access Time:** 250 ns.
2. **Low Power Consumption:**
- Active current: 30 mA (typical)
- Standby current: 100 µA (typical)
3. **Byte and Page Write Modes:**
- Byte write (single-byte programming)
- Page write (up to 64 bytes in a single operation)
4. **Data Protection:**
- Software-controlled write protection
- Hardware write protection via the `WE` pin
5. **Automatic Write Cycle Timing:**
- Self-timed programming cycle (5 ms max)
6. **High Reliability:**
- Endurance: 100,000 write cycles per byte
- Data retention: 100 years
7. **Compatibility:**
- Directly replaces 28-pin EPROMs (with minor circuit modifications)
- JEDEC-standard pinout
This device is commonly used in applications requiring non-volatile memory storage, such as embedded systems, industrial controls, and telecommunications equipment.
(Note: Xicor was acquired by Intersil, which was later acquired by Renesas Electronics.)
