AT28C64, 28C64 Datasheet, 28C64 64K ns Parallel PLCC EEPROM Datasheet, buy 28C 28C64 datasheet, 28C64 pdf, 28C64 data sheet, datasheet, data sheet, pdf, Atmel, 64K 8K x 8 CMOS E2PROM. 28C64 64K (8K x 8) CMOS E2prom with Page Write and Software Data Protection Features. Fast Read Access Time ns Automatic Page Write Operation.

Author: Sabar Gardajind
Country: Venezuela
Language: English (Spanish)
Genre: Art
Published (Last): 28 March 2014
Pages: 189
PDF File Size: 5.45 Mb
ePub File Size: 16.56 Mb
ISBN: 664-1-36811-979-1
Downloads: 88474
Price: Free* [*Free Regsitration Required]
Uploader: Goltishakar

Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. The chips are new, and I actually have two from two different manufacturers.

Here is the serial output. I don’t really like the design, but my guess is that it was trying to be compatible with an earlier part where one could write locations one at a time and just wait after each one. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. One thing that is missing is on page 7 of the datasheet, it states that you need to write a sequence of codes to disable write-protection.

I understand the benefits of separating the code into subroutines and will probably vatasheet this, but for now I am just trying to get the byte write working. Sign up using Facebook. All behave the same.

28C64A-15 – 28C64A 64K 150ns Parallel EEPROM Technical Data

Here is my code, sorry if it seems too cluttered:. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Post as a guest Name.


I’d recommend following that same sequence and also change your datashet sequence to follow the diagram on the following page.

28C64A Technical Data

I have tested an earlier version of the above program with a static RAM chip and everything works great. I have tied the top 10 address bits low and am only using the first 3 for now.

I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck. The timings for this particular EEPROM aren’t super-critical, but it has a timer which starts when the first dxtasheet is written and gets reset if another byte is written before it expires.

When the timer expires, an internal write cycle is triggered and additional writes before it completes. I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back. Thanks for the info. You have not indicated that you are doing anything with them?

BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the dataxheet protection” feature has previously been enabled. Here is my code, sorry datashet it seems too cluttered: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your datashwet use of the website is subject to these policies.


Thanks for the response, supercat. Mar 26 ’13 at The same diagram shows CE being asserted followed by OE for a read cycle. Also, I would suggest that you should write a writebyte procedure which sets all address and data wires to output and puts proper values on them, ensures WE and OE are deasserted, asserts CE, asserts and release WE, and releases CE, and a readbyte procedure which sets all address wires to output and puts proper values on them, sets all data wires to input, asserts CE and OE, samples all the data wires, and releases Datssheet and OE.

Email Required, but never shown. Since I am only using the first three address pins, the datashset are tied low. That might help things. If it has, you’ll need to wire up all your address wires in order to disable it. I have edited my question.

28C64 Datasheet

PeterJ 16k 20 42 Any help would be much appreciated. That will make the remainder of your code much more readable. I am using the Xicor 28C64AP chip datasheet. The device has 13 address pins, dahasheet should specify an address in binary from 0x to 0x1FFF.

Mar 27 ’13 at Home Questions Tags Users Unanswered. Initializing pins for write Sign up using Email and Password. Sign up or log in Sign up datasheeh Google.