May 15, 2019

Category. Description, 16K 2K x 8 Parallel Eeprom with Software DATA Protection. Company, ST Microelectronics, Inc. Datasheet, Download 28C16 datasheet. It is offered only with the TSOP28 package. The reader should refer to the M28C17 datasheet for more information about the Ready/Busy func- tion. OPERATION. FAST ACCESS TIME: 90ns. SINGLE 5V ± 10% SUPPLY VOLTAGE. LOW POWER CONSUMPTION. FAST WRITE CYCLE: – 64 Bytes Page Write Operation.

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What am I missing here?

28C16A Technical Data

Most new ones withwrite cycles, before data transfers get iffy. What do I need to do, in order to write data to the or 28C16? Sometimes 2 extra supplies.

D to be more accurate: To go even more off-topic The cell voltages are usually monitored and the programming procedure repeated by the programmer until the cells reach specified voltage levels when read back. It’s easy to find info on the 28C If you write to the same address at one write per 10mS, you’d kill that byte in about 20 minutes.

I think it’s an open-source homebrew programmer — you can build it yourself or buy it already built. A ZIF socket was inserted in one of those slots.

These requirements are different for different manufacturers and even different part numbers from the same manufacturer.

Been there and successfully done both. It depended on manufacturer. CPU and memory cards where made to accommodate this situation.

28C16A-15 – 28C16A 16K 250ns Parallel EEPROM Technical Data

It used an 8-pin TI switching chip to generate the programming voltages. Search Only Within This Dahasheet. Again, read the data sheet carefully and make sure it’s for the exact same device and manufacturer. Number one rule of experimenting datazheet to alway be sure to identify off spec parts to avaoiod re-using them as good ones.


The intent for these devices was to hold configuration info, and other field alterable data. Reminds me of the Old Apple ][ Disk ][ Drives. Chuck Richards Chuck, The is an electrically-erasable version of the The 8-bit CPUs back then all had bit address buses and, therefore, a max memory space of 64K 65, bytes. Writing was a bit different.

Egg on my face. When I set up my shop a few years ago when I started datasheett school, I got a programmer from Conitec.

28C16 Datasheet PDF

However, if you are looking to program EEPROMs, you may get good ideas from the Willem programmer, as it seems to be open-source of some variety. A needed a write pulse longer than uS ,nSbut shorter than 1mS 1,nS.

It reads just fine, but it won’t take any new data. And does anyone suspect that by NOT giving the a precisely timed pulse, that I may have damaged it?

Reason Report to Moderators I think this message isn’t appropriate for our Group. I got away with just using a 74C keyboard encoder, and feeding an inverted version of the datazheet data” output from that, directly to “not WE” on the Dallas part.

28C16 EEPROM used in Commodore and Amiga equipment

The ST Microelectronics part referenced above has a 64 byte page buffer, which means you can write up to 64 bytes to it – quickly – then pause and all 64 will program at once. I have one of those, it works great. Some as low a 10, What’s the deal with the ?


Thanks anyway for your valuable time. It was an ‘ad-hoc’ job, using pre-existing assemblies. The Group moderators are responsible for maintaining their community and can address these issues. Back in the late ‘s I had an S based programmer that did ‘s and ‘s. Otherwise, you can write single bytes to it, by pausing after each byte. Both of them require interesting programming voltages and very fussy timing sequences to work.

One day A good customer came in the shop all upset that his drive was dead, I hald it to my nose and went to the back to get a screwdriver and a chip. This cannot be undone. A few months after I got it back, the same thing happened again.

Back when I just got started in the electronics business, I was working as tech and general slave. Being from the “so, use a bigger hammer” school of thought, I un- soldered the switcher and instead ran some cables from a nice Lambda 50A regulated bench supply to the programmer.

No contracts, No fees, No Kidding! Hello, Forgive this slightly off-topic question: Do they require an exact timing pulse to be applied to the “not WE” pin, in order to write to it?