Electronic Components Datasheet Search |
|
AT29C257 Datasheet(PDF) 1 Page - ATMEL Corporation |
|
AT29C257 Datasheet(HTML) 1 Page - ATMEL Corporation |
1 / 12 page AT29C257 Features • Fast Read Access Time - 70 ns • 5-Volt-Only Reprogramming • Page Program Operation Single Cycle Reprogram (Erase and Program) Internal Address and Data Latches for 64-Bytes • Internal Program Control and Timer • Hardware and Software Data Protection • Fast Program Cycle Times Page (64-Byte) Program Time - 10 ms Chip Erase Time - 10 ms • DATA Polling for End of Program Detection • Low Power Dissipation 50 mA Active Current 300 µA CMOS Standby Current • Typical Endurance > 10,000 Cycles • Single 5V ± 10% Supply • CMOS and TTL Compatible Inputs and Outputs • Pin-Compatible with AT29C010A and AT29C512 for Easy System Upgrades Description The AT29C257 is a 5-volt-only in-system Flash programmable and erasable read only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits. Manu- factured with Atmel’s advanced nonvolatile CMOS technology, the device offers ac- cess times to 70 ns with power dissipation of just 275 mW. When the device is dese- lected, the CMOS standby current is less than 300 µA. The 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 AT29C257 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 a static RAM. Reprogramming the AT29C257 is performed on a page basis; 64-bytes of data are loaded into the device and then simultaneously programmed. The contents of the entire device may be erased by using a 6-byte software code (although erasure before programming is not needed). During a reprogram cycle, the address locations and 64-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 page and then program the latched data using an internal control timer. The end of a program cycle can be de- tected by DATA polling of I/O7. Once the end of a program cycle has been detected a new access for a read, program or chip erase can begin. Pin Name Function A0 - A14 Addresses CE Chip Enable OE Output Enable WE Write Enable I/O0 - I/O7 Data Inputs/Outputs NC No Connect DC Don’t Connect Pin Configurations 256K (32K x 8) 5-volt Only CMOS Flash Memory PLCC Top View 0012K AT29C257 4-105 |
Similar Part No. - AT29C257 |
|
Similar Description - AT29C257 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |