https://e2e.ti.com/support/logic/Products covered in this section are Gates, Little Logic, and Speciality Logic. To post a question click New Post.en-USTelligent Community 11https://e2e.ti.com/support/logic/f/logic-forum/996188/sn74axc4t774evm-b2-line-not-functioning-as-expected-in-rsv-package-whicle-works-fine-with-pw/3680408#3680408Fri, 23 Apr 2021 16:54:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:76c25154-78fa-4e28-b60f-7964828d9888Dylan Hubbard Hi Adarsh, That would be good, I want to make sure there isn't a fault in the connection between the EVM and breadboard. I looked over the PCB design and didnt identify any issues. I'll wait to hear from you Monday, and if the results remain the same, I'll grab an EVM myself and go run some tests. https://e2e.ti.com/support/logic/f/logic-forum/995705/sn74ahc245-vin-signal-operating-voltage/3680378#3680378Fri, 23 Apr 2021 16:34:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:bca73dd5-3230-4be3-a356-aed4df73965aRami Mooti1 Yes, this is ok Thanks, Rami https://e2e.ti.com/support/logic/f/logic-forum/995876/txs0108e-level-translator-for-mii-interface/3680368#3680368Fri, 23 Apr 2021 16:24:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7c266b91-12d6-4b95-9d01-cb66965e96cbRami Mooti1 Abhi, The TXS0108E could work, yes. I'd still recommend the two parts I listed above. They have the Vcc float Here's more information that may be useful and you can see on page 13 the low output channel-to-channel skew using the SN74AXC8T245 which would be favorable. Low Voltage Translation For SPI, UART, RGMII, JTAG Interfaces Thanks, Rami https://e2e.ti.com/support/logic/f/logic-forum/995705/sn74ahc245-vin-signal-operating-voltage/3680349#3680349Fri, 23 Apr 2021 16:12:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c96824cb-deae-4406-a27c-61721423de94Roy Chou1 Hi Rami, So I think we may suggest our user the recommended operating Vin(signal) range following below spec. Is is ok? Roy https://e2e.ti.com/support/logic/f/logic-forum/995705/sn74ahc245-vin-signal-operating-voltage/3680302#3680302Fri, 23 Apr 2021 15:27:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:dc32131d-eda0-4ad1-8b56-03bf4a18d96dRami Mooti1 Roy, I agree with you in that the 0-Vcc contradicts the datasheet. The data sheets states : "The inputs can accept voltages to 5.5 V at any valid VCC making it ideal for down translation" and "Inputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid VCC" so I would say the recommendation looks to be 0 to 5.5V. 0-7V is the abs max though and would not be the recommendation. Rami https://e2e.ti.com/support/logic/f/logic-forum/996188/sn74axc4t774evm-b2-line-not-functioning-as-expected-in-rsv-package-whicle-works-fine-with-pw/3680300#3680300Fri, 23 Apr 2021 15:26:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:056be81c-beb2-4b5b-851b-fd241a8defb3Adarsh Chengot Poonthottathil Hallo Dylan, I can test again directly on the EVM and let you know on Monday. I hope you can wait. Best regards, Adarsh https://e2e.ti.com/support/logic/f/logic-forum/996188/sn74axc4t774evm-b2-line-not-functioning-as-expected-in-rsv-package-whicle-works-fine-with-pw/3680272#3680272Fri, 23 Apr 2021 15:08:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c6351db6-3c76-4411-a468-621ac5a21e59Dylan Hubbard Hey Adarsh, So you aren't able to test directly on the EVM? The breadboard can introduce a lot of noise. https://e2e.ti.com/support/logic/f/logic-forum/994147/sn74ahct244-sn74ahct244dw-vs-sn74ahct244mdwrep/3680250#3680250Fri, 23 Apr 2021 14:59:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:e08680e9-5a86-4335-aea9-bc287e27ef85Dylan Hubbard Hi Aaron, We will try and dig this documentation up, please allow for a few days since this device is fairly old. https://e2e.ti.com/support/logic/f/logic-forum/996188/sn74axc4t774evm-b2-line-not-functioning-as-expected-in-rsv-package-whicle-works-fine-with-pw/3680247#3680247Fri, 23 Apr 2021 14:57:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:3eb50af2-6de1-473c-9ad3-e1037a87b4d2Adarsh Chengot Poonthottathil Hallo Dylan, Yes. Indeed I have I do not have a direct connection. I use a breadboard so I can insert the probe in it. Best regards Adarsh https://e2e.ti.com/support/logic/f/logic-forum/996188/sn74axc4t774evm-b2-line-not-functioning-as-expected-in-rsv-package-whicle-works-fine-with-pw/3680244#3680244Fri, 23 Apr 2021 14:54:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:35156247-cda9-493b-ad2a-f2a4d7981b43Dylan Hubbard Hey Adarsh, Are you measuring using the header pin or the included SMB connector? https://e2e.ti.com/support/logic/f/logic-forum/995705/sn74ahc245-vin-signal-operating-voltage/3680207#3680207Fri, 23 Apr 2021 14:23:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a5eeba9c-7f67-41c6-a582-1c25ba14f846Roy Chou1 Hi Ladisch, Okay. I think I may clarify my question. We just need to know the recommended operating voltage on every input signal pin. I don't think that the range is 0-Vcc because as you said that the AHC input buffers indeed are overvoltage tolerant. So I think that the input pin range is the same as absolute max ratings 0-7V. If you don't think so, maybe the suggested input signal range is 0-5V. I think it's ok to me, but I couldn't accept that the range is 0-Vcc. In our application, our signal may over the Vcc so we select the AHC part. If this is not recommended, may you let me know your suggestion? Thanks. Regards, Roy https://e2e.ti.com/support/logic/f/logic-forum/996230/student-software-license/3680148#3680148Fri, 23 Apr 2021 13:24:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:3b4a589c-f096-4811-90de-68514619407dLeonardEllis Hello Arley, Please contact Calculator support: https://education.ti.com/en/customer-support . Regards, ~Leonard https://e2e.ti.com/support/logic/f/logic-forum/996237/sn74lvc138a-electrical-connection-for-center-pad/3680146#3680146Fri, 23 Apr 2021 13:23:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:df378f4d-0fbd-423b-a752-31c84d905fd5Clemens Ladisch Yes; see [FAQ] Where do I connect the thermal pad of the logic QFN devices? https://e2e.ti.com/support/logic/f/logic-forum/996237/sn74lvc138a-electrical-connection-for-center-padFri, 23 Apr 2021 13:05:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:8296113f-6039-4440-887a-0a77fe812d36Ronnie Gaensli Part Number: SN74LVC138A For the RGY package, the datasheet doesn't clearly specify which electrical net the center / thermal pad shall be connector to. I'd assume GND but is this correct? SN74LVC138Ahttps://e2e.ti.com/support/logic/f/logic-forum/996230/student-software-licenseFri, 23 Apr 2021 12:45:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:3dc75faa-307b-4647-b38c-2d6e87bcc5d8Arley Celis I need help about this matter: In 2015, I bought the product TI-Nspire CX II CAS but I forgot my license number. The problem is that I don't have the packing product and I lost the bill. I need to have the TI-Nspire CX CAS Student Software for teaching maths to my students using the desktop sharing option on my computer. Thank you for your attention Kind regards. Arley David Celis Vargas Student Software licensehttps://e2e.ti.com/support/logic/f/logic-forum/996188/sn74axc4t774evm-b2-line-not-functioning-as-expected-in-rsv-package-whicle-works-fine-with-pwFri, 23 Apr 2021 10:51:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:4107bcf3-3584-4cc6-b5c1-9dc2a96cb1a6Adarsh Chengot Poonthottathil Part Number: SN74AXC4T774EVM Hallo, 1. Very recently I started using SN74AXC4T774EVM for SPI lines between a microcontroller (3V) and a sensor(1.8V). I am receiving proper signals as expected from PW package but not from RSV package. I was not able to find any difference in configuration of the two package in the user guide. DIR1, DIR2 and DIR3 are connected to VCCA using pull up (A->B), while DIR4 is grounded (B->A). My connection is accordingly. VCCA = 3V VCCB = 1.8V A1-> Chip select A2-> MOSI A3->CLOCK A4->MISO When I am using RSV package, I am only able to receive proper signal from B1,B3 and B4. While the B2 signal line is corrupted with some noise of ground issue, which I am not able to identify. When using PW package with the same configuration, all signal lines looks good. Here are the screenshots from my scope. This is the MOSI line from A2. This is the MOSI line from B2. as you can see the signal is not restored. What could be the reason for such a behavior? The PW package is working properly. Thank you for your time. with regards, Adarsh SN74AXC4T774EVMhttps://e2e.ti.com/support/logic/f/logic-forum/992346/txb0304evm-spi-lines-experiencing-high-noise/3679988#3679988Fri, 23 Apr 2021 09:50:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:1c7cb52b-9ebc-4295-b5f0-0a604fb6ffdaAdarsh Chengot Poonthottathil Hallo, I received the SN74AXC4T774 EVM board recently and now the signals looks good as expected. Thank you. best regards, Adarsh https://e2e.ti.com/support/logic/f/logic-forum/995876/txs0108e-level-translator-for-mii-interface/3679920#3679920Fri, 23 Apr 2021 08:33:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:cbe6f1cb-a769-44a4-ad32-b66f67e278a4Abhishek Hello Rami Mooti1, In my case Max data rate is 10Mbps . So TXS0108E would be fine. Thank you, Abhishek https://e2e.ti.com/support/logic/f/logic-forum/995705/sn74ahc245-vin-signal-operating-voltage/3679911#3679911Fri, 23 Apr 2021 08:28:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9434d658-11fb-4b73-a646-8abf10169679Clemens Ladisch AHC input buffers indeed are overvoltage tolerant. However, in this device, every I/O pin is connected to both an input buffer and an output buffer, and the output buffer is not overvoltage tolerant. If you need to be able to use higher input voltages, you must use a unidirectional buffer like the SN74AHC541. https://e2e.ti.com/support/logic/f/logic-forum/996115/sn74lv14a-what-is-the-input-transition-rate-of-sn74lv14a/3679904#3679904Fri, 23 Apr 2021 08:23:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:f9785b18-03e7-4a29-898c-2dfabbcaed54Clemens Ladisch Devices with Schmitt-trigger inputs have no limit on the allowed input transition rate. Allowing slow edges is the only purpose of Schmitt-trigger inputs.