Parallel EEPROM

What is a dual-marked part?

Some devices have a corresponding Standard Military Drawing Number (SMD#) as listed by the Defense Supply Center Columbus (DSCC)/Defense Logistics Agency (DLA). When applicable, these part numbers are dual-marked on the packages and all corresponding shipping paperwork; refer to the complete list of our corresponding AT28Cxxx part numbers.

Where can I find a part number that was described by the DSCC as an Atmel part and begins with 5962-XXX? 

Part numbers that are prefixed with 5962 are the correct SMD#s as listed by the DSCC/DLA. However, due to system limitations, you need the associated AT28Cxxx part numbers to search and place orders on our purchasing portal. See Figure 1 below for information about how parts are marked.

Do you offer programming support?

Please see the third-party programmer application note if you would like to program or read stand-alone devices. This application note lists companies that offer stand-alone device programming tools. Review the list for a company near your location.

Can I purchase die or a whole wafer?

Of the three densities offered—64 Kbit, 256 Kbit and 1 Mbit —all are available as either diced die in a waffle pack or as whole wafer.

How does Parallel EEPROM (PEEPROM) speed compare to that of a serial device?

A PEEPROM’s 90 ns tAA speed equals approximately 11 MHz of serial clock speed. Thus, a PEEPROM’S communication speed and ability to access 8 or 16 bits at once provides for excellent data transmission rates.

Is there a difference between industrial and military devices?

The military version has Error Correction Coding (ECC) and error detection and fixing, which are features that the industrial version does not offer. Four internal parity bits exist for every byte, and using the Hamming algorithm, the device will automatically fix the first bit error in every byte.

Since we test all 12 bits, you will not see an error until the second bit failure in the same byte. The odds of this happening are very low, hence the highly reliable nature of the military products.

Are these military-graded parts covered under ITAR?

The AT28xxM/883 military-graded (rated/warrantied between −55°C and +125°C) product has an export classification of 3A001.a.2.c. These parts are controlled by the U.S. government under the Export Administration Regulations (EAR). However, they are not controlled under International Traffic in Arms Regulations (ITAR).

When will these parts be discontinued?

These parts are subject to market conditions and the continued operations of package component suppliers. Over the last 20+ years, some suppliers have discontinued the components for the various packages utilized by this product family; both industrial plastic and ceramic military packages have been affected. Where possible and feasible, our packages have been qualified internally. As long as customer demand exists and it is feasible, we will continue to support and supply these devices. There are no current plans to discontinue these products, and they will remain available for customers who utilize these devices.