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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Just Beyond the Fringe http: A RAM device, obviously, can be written to, about the same speed as it can be read. It’s easy to find info on the 28C Your email is included with the abuse report. It was the 28c166 think polyester leisure suits. Both of them require interesting programming voltages and very fussy timing sequences to work.

Some as low a 10, The Group moderators are responsible for maintaining their community and can address these issues. The catasheet CPUs back then all had bit address buses and, therefore, a max memory space of 64K 65, bytes. You won’t get anywhere without a data sheet for exactly the parts you have, and even then it’s a lot of work to make a programmer that does the job correctly. Most sane people don’t datashheet their time building clocks with antiquated technology!

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.

This situation was usually handled by either running the whole memory space for the slowest device, or for the fastest memory, and then adding ‘wait-states’ for the slower devices. Got away without needing a pulse. Most new ones withwrite cycles, before data transfers get iffy.


So, I decided to do a little experiment: They are not intended to hold actual program code, even though you could do this. The intent for these devices was to hold configuration info, and other field alterable data. What am I missing here? First hit on google: Do they require an exact timing pulse to be applied to the “not WE” pin, in order to write to it? This cannot be undone. CPU and memory cards where made to accommodate this situation.

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

Thanks anyway for your valuable time. It used an 8-pin TI switching chip to generate the programming voltages. Sometimes 2 extra supplies. Egg on my face. Writing was a bit different. What’s the deal with the ? 2c16 depended on manufacturer. The new topic will begin with this message. Again, read the data sheet carefully and make sure it’s for the exact datawheet device and manufacturer.

Datssheet are algorithms coded into the programmers to hit the EPROM with the appropropriate voltages for specific time periods. And does anyone suspect that by NOT giving the a precisely timed pulse, that I may have damaged it? I think it’s an open-source homebrew programmer — you can build it yourself or buy it already built.

When I set up my shop a few years ago when I started grad school, I got a programmer from Conitec. What do I need to do, in order to write data to the or 28C16? Reminds me of the Old Apple ][ Disk ][ Drives.

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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.


Otherwise, you can write single bytes to it, by pausing after each byte. There was a most satisfying “BLAM! I got away with just using a 74C keyboard encoder, and feeding an inverted version of the “valid data” output from that, directly to “not WE” on the Dallas part. That’s why several types of memory had similar pinouts, though hardwire jumpers also had to be set, due to the differences.

D to be more accurate: I’ve never used the Willem Programmer, I don’t sell it, etc. Search Only Within This Topic. A few months after I got it back, the same thing happened again. If the user put the cable on wrong, the 74LS would turn into a 74LS mount st helens.

A needed a write pulse longer than uS ,nSbut shorter than 1mS 1,nS. It was an ‘ad-hoc’ job, using pre-existing assemblies.

Subject of the new 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. Reason Report to Moderators I think this message isn’t appropriate for our Group.

At 10mS per byte, it would get quite tiresome. It reads just fine, but it won’t take any new data. Been there and successfully done both. These requirements are different for different manufacturers and even different part numbers from the ratasheet manufacturer.