EOL for Dallas DS1743W+ series - Page 1
Forum section: electronics / projects

author: JonDev
author_rank: Newbie
timestamp: May 10, 2016, 05:29:08 pm
content: Oh Dear...So I just found out that this timekeeping ram is fixing to no longer be available and I was wondering if you all have any ideas as to what should I look to as a substitute?Any help on this matter is much appreciated.

author: danadak
author_rank: Super Contributor
timestamp: May 10, 2016, 09:42:46 pm
content: If you can't find a second source or anything close considera PSOC mounted on an adapter board to meet pinout. Youwould have to code the PSOC, but there are already RTCcoded solutions for PSOC so adapting relatively easy, And thereis interface flexibility and user routabilty to help.http://www.cypress.com/products/32-bit-arm-cortex-m-psocRegards, Dana.

author: JonDev
author_rank: Newbie
timestamp: May 12, 2016, 01:26:20 pm
content: Thanks Danadak,I will keep that in mind. I haven't played around with PSOC too much so I'm not too sure if this option will work.Is there any "comparable" chips out there that would be a direct replacement?

author: coppice
author_rank: Super Contributor
timestamp: May 12, 2016, 01:50:43 pm
content: I don't think anyone puts a battery inside an RTC package these days, so I don't think there are any direct substitutes for the DS1743. It would be easy to make a small PCB with an MCU to emulate the electronics and a battery clip for a small lithium cell.

author: Dielectric
author_rank: Regular Contributor
timestamp: May 12, 2016, 04:18:35 pm
content: Not sure how much of the Dallas part you were using; just the RTC or the SRAM too?Cypress makes some nifty NVSRAM + RTC chips, which may be a little easier than doing a PSoC development cycle:http://www.cypress.com/products/16mb-nvsram-replacement-battery-backed-sram-and-mram

author: JonDev
author_rank: Newbie
timestamp: May 12, 2016, 08:51:27 pm
content: I am using both the SRAM and the RTC.You think I can use this ramhttp://www.atmel.com/Images/doc0274.pdfNevermind, I'm dumb. I would need a 3.3V operating range.If the RTC were external, where would it connect to?

author: amyk
author_rank: Super Contributor
timestamp: May 13, 2016, 11:51:06 am
content: Quote from: danadak on May 10, 2016, 09:42:46 pmA 32-bit ARM to emulate a few KB of SRAM and an RTC? Do you work for Cypress?

author: danadak
author_rank: Super Contributor
timestamp: May 13, 2016, 01:07:27 pm
content: I am retired EE, do not work for Cypress. But do like theiranalog + DSP + ARM solutions on a chip. Plus routabiltysomewhat like FPGA.Attached a partial list of the components that are available (moston all chips) to drag and drop onto design schematic.Regards, Dana.

author: JonDev
author_rank: Newbie
timestamp: May 13, 2016, 04:06:16 pm
content: Thanks again Danadak.I appreciate all the help I can get especially from a seasoned engineer.I am really new to the game and I got my degree from a degree mill (ITT Tech) unfortunately so I am more or less having to get on the job training.I wish I would have known better and chose a different school but not much I can do now. Got a 4 year degree but the school is not ABET accredited. I would go back to a different school but I just don't have another $100K.It doesn't help that our company recently let go our EE of 18 years so I don't have a senior engineer to turn to for advice.