Features

– Single Cycle Reprogram (Erase and Program)

– 1024 Sectors (256 Bytes/Sector)

– Internal Address and Data Latches for 256 Bytes

– 40 mA Active Current

– 300 µA CMOS Standby Current

±10% Supply

1.

Description

The AT29C020 is a 5-volt-only in-system Flash programmable and erasable read-only

memory (PEROM). Its 2 megabits of memory is organized as 262,144 bytes. Manu-

factured with Atmel’s advanced nonvolatile CMOS technology, the device offers

access times to 70 ns with power dissipation of just 220 mW over the industrial tem-

perature range. When the device is deselected, the CMOS standby current is less

than 300 µA. Device endurance is such that any sector can typically be written to in

excess of 10,000 times.

To allow for simple in-system reprogrammability, the AT29C020 does not require high

input voltages for programming. Five-volt-only commands determine the operation of

the device. Reading data out of the device is similar to reading from an EPROM.

Reprogramming the AT29C020 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 256 bytes of data are internally

latched, freeing the address and data bus for other operations. Following the initiation

of a program cycle, the device will automatically erase the sector and then program

the latched data using an internal control timer. The end of a program cycle can be

detected by DATA polling of I/O7. Once the end of a program cycle has been

detected, a new access for a read or program can begin.

2-megabit

(256K x 8)

5-volt Only

Flash Memory

AT29C020

0291S–FLASH–11/08