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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There are algorithms coded into the programmers to hit the EPROM with the appropropriate voltages for specific time periods. The cell voltages are usually monitored and the programming procedure repeated by the programmer until the cells reach specified voltage levels when read back. Hello, Forgive this slightly off-topic question: What do I need to do, in order to write data to the or 28C16? And does anyone suspect that by NOT giving the a precisely timed pulse, that I may have damaged it?
Chuck Richards Chuck, The is an electrically-erasable version of the Both of them require interesting programming voltages and very fussy timing sequences to work. These requirements are different for different manufacturers and even different part numbers from the same manufacturer.
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 spend their time building clocks with antiquated technology! D to be more accurate: I think it’s an open-source homebrew programmer — you can build it yourself or buy it already built.
I’ve never used the Willem Programmer, I don’t sell it, etc. I have one of those, it works great. Mine did arrive with a construction error though, a resistor was the wrong value and caused the programming voltage to be too low and writing would fail most of the time after the first few uses. Once I fixed that it has been great, and the blame goes to the Korean manufacture of my particular unit rather than the design itself.
Two E’s instead of one Big difference. Been there and successfully done both. Thanks anyway for your valuable time.
No contracts, No fees, No Kidding! Egg on my face. 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.
Their site has forums that may point you in the right direction. Back when I just got started in the electronics business, I was working as tech and general slave.
It was the 70’s think polyester leisure suits. It was an ‘ad-hoc’ job, using pre-existing assemblies. A ZIF socket was inserted in one of those slots. The 8-bit CPUs back then all had bit address buses and, therefore, a max memory space of 64K 65, bytes.
CPU and memory cards where made to accommodate this situation. That’s why several types of memory had similar pinouts, though hardwire jumpers also had to be set, due to the differences. 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. Writing was a bit different.
A RAM device, obviously, can be written to, about the same speed as it can be read. A needed a write pulse longer than uS ,nSbut shorter than 1mS 1,nS.
28C16 (STMicroelectronics) – 16k 2k X 8 Parallel Eeprom With Software Data Protection
Sometimes 2 extra supplies. It depended on manufacturer. The intent for these devices was to hold configuration info, and other field alterable data.
They are not intended to hold actual program code, even though you could do this. At 10mS per byte, it would get quite tiresome. Some as low a 10, Most new ones withwrite cycles, before data transfers get iffy.
If you write to the same address at one write per 10mS, you’d kill that byte in about 20 minutes. It’s easy to find info on the 28C First hit on google: 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.
Otherwise, you can write single bytes to it, by pausing after each byte. Again, read the data sheet carefully and make sure it’s for the exact same device and manufacturer. Won’t touch the s I have, though To go even more off-topic Back in the late ‘s I had an S based programmer that did ‘s and ‘s.
It used an 8-pin TI switching chip to generate the programming voltages. A few months after I got it back, the same thing happened again. 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. There was a most satisfying “BLAM! Number one rule of experimenting is to alway be sure to identify off spec parts to avaoiod re-using them as good ones. Reminds me of the Old Apple ][ Disk ][ Drives.
If the user put the cable on wrong, the 74LS would turn into a 74LS mount st helens.
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. Just Beyond the Fringe http: This cannot be undone.
28C16 Datasheet PDF
The Group moderators are responsible for maintaining their community and can address these issues. Your email is included with the abuse report. Dataaheet Only Within This Topic. So, I decided to do a little experiment: Anyone familiar with these parts? Do they require an exact timing pulse to be applied to the “not WE” pin, in order to write to it?
What’s the deal with the ? What am I missing here? 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.
AT28CPC IC EEPROM 16K NS 24DIP Atmel datasheet pdf data sheet FREE from
Got away without needing a pulse. It reads just fine, but it won’t take any new data. When I set up my shop a few years ago when I started grad school, I got a programmer from Conitec. Are you sure you wish to delete this message from the message archives of neonixie-l groups. Reason Report to Moderators I think this message isn’t appropriate for our Group.
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