Anterwell Technology Ltd. |
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FEATURES
• Access Time: 200ns
• Simple Byte and Page Write
— Single 5V Supply
—No External High Voltages or VPP Control Circuits
— Self-Timed
—No Erase Before Write
—No Complex Programming Algorithms
—No Overerase Problem
• Low Power CMOS:
—Active: 60mA
—Standby: 200µA
• Software Data Protection
— Protects Data Against System Level Inadvertent Writes
• High Speed Page Write Capability
• Highly Reliable Direct Write™ Cell
— Endurance: 100,000 Write Cycles
— Data Retention: 100 Years
• Early End of Write Detection
— DATA Polling
—Toggle Bit Polling
DESCRIPTION
The X28C256 is an 32K x 8 E2PROM, fabricated with Xicor’s
proprietary, high performance, floating gate CMOS technology. Like
all Xicor programmable nonvolatile memories the X28C256 is a 5V
only device. The X28C256 features the JEDEC approved pinout for
bytewide memories, compatible with industry standard RAMs. The
X28C256 supports a 64-byte page write operation, effectively
providing a 78µs/byte write cycle and enabling the entire memory to
be typically written in less than 2.5 seconds. The X28C256 also
features DATA and Toggle Bit Polling, a system software support
scheme used to indicate the early completion of a write cycle. In
addition, the X28C256 includes a user-optional software data
protection mode that further enhances Xicor’s hardware write
protect capability. Xicor E2PROMs are designed and tested for
applications requiring extended endurance. Inherent data retention
is greater than 100 years.
ABSOLUTE MAXIMUM RATINGS*
Temperature under Bias
X28C256...................................... –10°C to +85°C
X28C256I, X28C256M............... –65°C to +135°C
Storage Temperature ....................... –65°C to +150°C
Voltage on any Pin with Respect to VSS ....................................... –1V to +7V
D.C. Output Current ............................................. 5mA
Lead Temperature (Soldering, 10 seconds) .............................. 300°C
RECOMMENDED OPERATING CONDITIONS
Temperature | Min. | Max. |
Commercial | 0°C | +70°C |
Industrial | –40°C | +85°C |
Military | –55°C | +125°C |
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