5 Volt, Byte Alterable E2PROM The X28C256DMB is a 256Kbit (32K x 8) CMOS EEPROM manufactured by Xicor. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Memory Size:** 256Kbit (32K x 8)
- **Technology:** CMOS EEPROM
- **Supply Voltage:** 5V ±10%
- **Access Time:** 120ns, 150ns, 200ns (depending on variant)
- **Operating Temperature Range:** Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
- **Endurance:** 100,000 write cycles per byte (minimum)
- **Data Retention:** 100 years (minimum)
- **Package:** 28-pin DIP (Dual In-line Package)
### **Descriptions:**
- The X28C256DMB is a high-performance, byte-erasable EEPROM with a fast read access time.
- It supports a simple 5V-only operation without requiring additional voltage supplies.
- Features a hardware and software data protection mechanism to prevent accidental writes.
### **Features:**
- **Byte-Write Capability:** Allows individual bytes to be written and erased.
- **Automatic Write Timing:** Internal control of the write cycle.
- **Low Power Consumption:** Active current of 30mA (typical), standby current of 100µA (typical).
- **Hardware Write Protection:** WP pin enables/disables write operations.
- **Software Data Protection (SDP):** Prevents inadvertent writes via a specific command sequence.
- **TTL-Compatible Inputs/Outputs:** Ensures compatibility with standard logic levels.
- **JEDEC Standard Pinout:** Compatible with other 28-pin EEPROMs.
This information is based solely on the manufacturer's specifications for the X28C256DMB EEPROM.
