Super simple eeprom

[antenna]

I need a very simple memory chip that doesn't use addressing or header stuff, basically a 512 to 1024 bit (or more is ok, I can leave it blank) shift register with non-volatile memory that can be programmed once and repeat the same output stream each time it is triggered.  I can give it a clock and trigger, but I just want it to repeat a very specific serial logic sequence each trigger pulse or power cycle.  Any suggestions?

Thanks!

Edit:  It needs to be tiny and low power, so arduino type solutions are out.

[wraper]

Just use a cheapest MCU.

[WattsThat]

A bare ATtiny-10 is $0.44 and consumes 200ua in active mode. 1.8 to 5.5v supply. That’s not usable?

[antenna]

I didn't realize they came that small, that will work!  Thanks!  I was tempted to pull an audio chip out of one of the dog buttons and trying to make that work but this neat little micro should work too.

Thanks!

[bingo600]

This might come in handy for  tiny-10 programming

https://junkplusarduino.blogspot.com/p/attiny10-resources.html

https://make.kosakalab.com/make/electronic-work/arduino_tpi_en/

https://kevincuzner.com/2020/11/08/avr-tpi-programming-with-usbasp-for-dummies/
https://www.buildcircuit.com/usbasp-firmware-update-guide/

[AndyBeez]

Might not be a fit for your application, but be aware of a family of 3 pin serial EEPROMs which are deployed for configuration and identification. Usually termed 1-wire EEPROMs. For example a 1K device in a transistor TO92 package. Maxim DS2431
https://www.enrgtech.co.uk/product/eeprom/ET18612841/DS2431-

[antenna]

Might not be a fit for your application, but be aware of a family of 3 pin serial EEPROMs which are deployed for configuration and identification. Usually termed 1-wire EEPROMs. For example a 1K device in a transistor TO92 package. Maxim DS2431
https://www.enrgtech.co.uk/product/eeprom/ET18612841/DS2431-

I saw those, but not sure about the header data or if they automatically output the contents directly on power up.  One of the reasons for this is for transmitter identification.  I figured if I had a 10Hz clock oscillator I could program in a call sign as binary and use the output of the chip for OOKing a TX, so that is one of the reasons I didn't want it to need addressing or startup data.  I was hoping to run this on a 3v button cell and have it last a while, but if I need to have a micro to tell the eeprom what to output, then I may as well have the micro do it.  I was just hoping for a simpler, program once, solution.  I get everyones desire to connect a laptop and upload code, it is easy, but even that is far too much for the simple tasks I require it to do.

[antenna]

The ideal chip would have a clock pin, a write enable pin, a serial in/out pin, and power pins.  If the write enable is high, it accepts data, if not, it simply outputs the programmed string every time it receives power (or a trigger on another pin).  No header, no address stuff, just the string in memory.

[Andy Chee]

I would think even an ancient 12F675 microcontroller is capable of your application.  It has a 128-byte data EEPROM for storing your string.  It has an internal oscillator for running the processor.  It has a handful of I/O pins for you to program as input triggers/enables and data output.

The microprocessor code is simple; when it detects a pin going high, it dumps the EEPROM contents out another pin!  And you could probably include a RS232 interface to re-program the EEPROM contents on-the-fly.

There are certainly more capable microcontrollers that would fit the bill.

[Andree Henkel]

The most easy to interface in firmware is SPI

number of pins of interface to µController
1: single wire  ->  2: I2C  ->  3: SPI

difficulty of firmware
SPI -> I2C -> singlewire

[Ground_Loop]

Signetics made something in the 70s very similar to what you are asking about. It is a simple one bit shift register with up 1024 bit storage locations.  Clock in the bit stream and continue clocking to recirculate endlessly.  I have a couple that are 256 bit  x 2 for a total of 512 bit storage.  The downside is that they are volatile memory.  If you can keep a power source on them they might work for you.  The part number I have is. Signetics 2527V in 8-pin DIP.  The 2533V is 1024 bit.