29C040 Datasheet | Atmel

Features - - - - - - - - - - - - Fast Read Access Time - 100 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 m A Active Current 100 µA CMOS Standby Current Typical Endurance > 10,000 Cycles Single 5V ± 10% Supply CMOS and TTL patible Inputs and Outputs 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 100 ns, and a low 220 m W 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 patible with other devices in Atmel’s 5-volt-only Flash family. (continued) 4-Megabit (512K x 8) 5-volt Only 256-Byte Sector CMOS Flash Memory AT29C040A AT29C040A Pin Configurations Pin Name A0 - A18 CE OE WE Function Addresses Chip Enable Output Enable Write Enable I/O0 - I/O7 Data Inputs/Outputs NC No Connect DIP Top View TSOP Top View Type 1 0333E- 9/97 Description (Continued) To allow for simple in-system reprogrammability, the AT29C040A does not require high input voltages for programming. Five-volt-only mands determine the operation of the device. Reading data out of the device is similar to reading from an EPROM. Reprogramming the AT29C040A is performed on a sector basis; 256-bytes of data are loaded into the device and then simultaneously programmed. During a reprogram cycle, the address locations and 256bytes of data are internally...