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*The following are the basic parameters of the product, involving the characteristics of the product and its category
| TYPE | DESCRIPTION | 
|---|---|
| Part Status | Active | 
| Mounting Type | Surface Mount | 
| Mount | Surface Mount | 
| Number of Functions | 1 | 
| RoHS Status | Non-RoHS Compliant | 
| Data Polling | YES | 
| Toggle Bit | YES | 
| Memory Width | 8 | 
| Supply Voltage | 5V | 
| Operating Supply Voltage | 5V | 
| Power Supplies | 5V | 
| Programming Voltage | 5V | 
| Packaging | Tube | 
| Pbfree Code | no | 
| Lead Free | Contains Lead | 
| Qualification Status | Not Qualified | 
| Height Seated (Max) | 2.54mm | 
| Technology | CMOS | 
| Contact Plating | Lead, Tin | 
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 
| Terminal Pitch | 1.27mm | 
| Number of Pins | 32 | 
| Number of Terminations | 32 | 
| Terminal Position | QUAD | 
| Memory Interface | Parallel | 
| Voltage – Supply | 4.5V~5.5V | 
| Published | 1997 | 
| Memory Type | Non-Volatile | 
| Nominal Supply Current | 80mA | 
| Factory Lead Time | 23 Weeks | 
| Memory Format | EEPROM | 
| Width | 11.43mm | 
| Operating Mode | ASYNCHRONOUS | 
| Length | 13.97mm | 
| Write Cycle Time – Word, Page | 3ms | 
| Write Cycle Time-Max (tWC) | 3ms | 
| Memory Size | 256Kb 32K x 8 | 
| Access Time | 90ns | 
| Density | 256 kb | 
| Operating Temperature | -55°C~125°C TC | 
| Interface | Parallel, SPI | 
| Standby Current-Max | 0.0003A | 
| Endurance | 10000 Write/Erase Cycles | 
| Page Size | 64words | 
| Screening Level | MIL-STD-883 Class C | 
| Base Part Number | AT28HC256 | 
| Frequency | 90GHz | 
| Additional Feature | AUTOMATIC WRITE | 
| Package / Case | 32-CLCC | 
*The following components have specifications similar
*The following five components have specifications similar