Description
The AT29C040A is a 5-volt-only in-system Flash Programmable and Erasable Read Only Memory (PEROM). Its 4 megabits of memory is organized as 524,288 words by 8 bits. Manufactured with Atmel’s advanced nonvolatile CMOS EEPROM technology, the device offers access times up to 120 ns, and a low 220 mW power dissipation. When the device is deselected, the CMOS standby current is less than 100 µA. The device endurance is such that any sector can typically be written to in excess of 10,000 times. The programming algorithm is compatible with other devices in Atmel’s 5-volt-only Flash family.

FEATUREs
• Fast Read Access Time - 120 ns
• 5-Volt-Only Reprogramming
• Sector Program Operation
   Single Cycle Reprogram (Erase and Program)
   2048 Sectors (256 bytes/sector)
   Internal Address and Data Latches for 256-Bytes
• Internal Program Control and Timer
• Hardware and Software Data Protection
• Two 16 KB Boot Blocks with Lockout
• Fast Sector Program Cycle Time - 10 ms
• DATA Polling for End of Program Detection
• Low Power Dissipation
   40 mA Active Current
   100 µA CMOS Standby Current
• Typical Endurance > 10,000 Cycles
• Single 5V ± 10% Supply
• CMOS and TTL Compatible Inputs and Outputs