Description
The AT49F040B is a 5-volt-only in-system reprogrammable Flash Memory. Its 4 megabits of memory is organized as 524,288 words by 8 bits. Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers access times to 55 ns with power dissipation of just 110 mW over the commercial temperature range.

Features
• Single Supply for Read and Write: 4.5 to 5.5V
• Fast Read Access Time – 55 ns
• Internal Program Control and Timer
• Flexible Sector Architecture
   – One 16K Bytes Boot Sector with Programming Lockout
   – Two 8K Bytes Parameter Sectors
   – Eight Main Memory Sectors (One 32K Bytes, Seven 64K Bytes)
• Fast Erase Cycle Time – 8 Seconds
• Byte-by-Byte Programming – 12 µs/Byte Typical
• Hardware Data Protection
• DATA Polling or Toggle Bit for End of Program Detection
• Low Power Dissipation
   – 20 mA Active Current
   – 25 µA CMOS Standby Current
• Minimum 100,000 Write Cycles