https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/<p style="display:none;">blank</p>en-USTelligent Community 13https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1662585/tmux1574-external-pull-up-resistor-for-the-tmux1574Thu, 09 Jul 2026 02:32:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:26ce98e6-3018-402e-82d8-9f95c86e110etakahiro higuchiPart Number: TMUX1574 Hi team, I am researching JTAG signal switching circuits and am considering a MUX + LV conversion configuration. The SN74AXC4T774PW specifies that the external pull-up resistance must be 7kohm or less. Is it acceptable to connect a 10kohm pull-up resistor to the S1A pin of the TMUX1574? Or should I use a pull-up resistor of 7kohm or less? Best regards,TMUX1574Test &amp; Measurementhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1662002/hd3ss3220-few-questions-for-the-debug-accessory-mode/6409453Wed, 08 Jul 2026 14:35:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c7eb041d-e9e2-4ed4-8a8d-31cca0c90284Katy WestHi Henry, As long as the accessory presents R(p), then yes, that is fine. Best, Katyhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1662002/hd3ss3220-few-questions-for-the-debug-accessory-mode/6408590Wed, 08 Jul 2026 02:22:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:5d3dbd4a-83b4-4358-903d-4adb419bb2e1Henry Wang3Hi Sir, Thank you for your prompt reply. I would like to further confirm a detail: the customer has configured the ADDR pin of the HD3SS3220 to GPIO mode and is not using the I2C interface. Is the I2C interface strictly required to put the HD3SS3220 into debug accessory mode?https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1662002/hd3ss3220-few-questions-for-the-debug-accessory-mode/6408149Tue, 07 Jul 2026 19:57:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:aa3a2e79-ced7-47bf-b3c1-3bc5f91284f1Katy WestHi Henry, Please see my comments below: 1. When the HD3SS3220 is configured as a UFP, can we use I/O pins to configure entry into debug accessory mode? Specifically, should both the CC1 and CC2 pins be pulled low via 5.1k Ohm resistors? The HD3SS3220 follows the USB-C protocol for debug accessory mode configuration. The HD3SS3220 when configured as a UFP-only detects a debug accessory which presents R(p) on both CC1 and CC2 pins. The HD3SS3220 sets ACCESSORY_CONNECTED register to 3b&#39;111 to indicate a DFP debug accessory 2. While the device is in debug accessory mode, do the USB SuperSpeed differential signals (TX/RX) still function normally for data transmission? The switch part of this device is passive. Therefore, as long the mux is turned on (with 3.3V to VCC33) and the data being passed through the switches is within datasheet recommendations, that is ok. 3. During debug accessory mode, is it possible to connect the CC1 and CC2 pins to a comparator(TLV3202) to determine the High/Low logic? shown as below figure. That should not be a problem Best, Katyhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1661780/cd74hc4051-pin13-pin14-are-short-to-vee-internally/6407621Tue, 07 Jul 2026 14:39:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:322237f6-9434-414f-bfc3-5e57a69eaabfKaty WestHi Gary, Just want to confirm what Clemens said above. Please make sure that the signals going into the MUX are clean and are within datasheet spec. Best, Katyhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1662002/hd3ss3220-few-questions-for-the-debug-accessory-modeTue, 07 Jul 2026 14:30:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:6e4290be-9fc0-4792-9637-e6c74c7ed05cHenry Wang3Part Number: HD3SS3220 Other Parts Discussed in Thread: TLV3202 , Hi Sir, My customer has a few questions regarding the operation of the HD3S3220. 1. When the HD3S3220 is configured as a UFP, can we use I/O pins to configure entry into debug accessory mode? Specifically, should both the CC1 and CC2 pins be pulled low via 5.1k Ohm resistors? 2. While the device is in debug accessory mode, do the USB SuperSpeed differential signals (TX/RX) still function normally for data transmission? 3. During debug accessory mode, is it possible to connect the CC1 and CC2 pins to a comparator(TLV3202) to determine the High/Low logic? shown as below figure.HD3SS3220TLV3202Test &amp; Measurementhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1661780/cd74hc4051-pin13-pin14-are-short-to-vee-internally/6407025Tue, 07 Jul 2026 07:08:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9bae33c8-175f-4340-b738-c1d061549990Clemens Ladisch1. The allowed peak voltage is &#177;0.5 V beyond the supply rails (see the absolute maximum ratings). The allowed time of duration to go beyond that is 0 ns. 2. You can use plain silicon diodes to VEE/VCC, ideally with a resistor between the diodes and the mux pin. I do not know what impedance your circuit can tolerate (but the switch itself already has more than 50 Ω).https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1661780/cd74hc4051-pin13-pin14-are-short-to-vee-internallyTue, 07 Jul 2026 06:33:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:5ce5e122-f748-4968-b3fb-894f796bc99bGary ZengPart Number: CD74HC4051 Hi team, My customer is using CD74HC4051M96 in traction inverter and meet damaged issue. Pin13 and Pin14 are short to VEE. Yellow means pin16. Blue means PIN14. Red means PIN13. Q1: Though in datasheet, input signal can not exceed VEE ~ VCC(they use 5Vcc). they still want to know the transient peak voltage and time of duration (ns) Q2: How to deal with this case, add ESD/TVS on input end? which PN do you recommend?HybridCD74HC4051electric &amp; powertrain systemshttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1660415/sn74tvc3306-datasheet-inconsistency/6406018Mon, 06 Jul 2026 17:01:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:4357d1f1-de79-4ac5-b502-68471a4aa60fNir GilgurHello Eric, Yes this has been documented in our datasheet correction back log. Currently our teams bandwidth is limited, but I will try to fix this datasheet by the end of this month. Thanks, Nirhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1660415/sn74tvc3306-datasheet-inconsistency/6405862Mon, 06 Jul 2026 15:48:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:625aa777-bc9a-4b02-8e02-5a2675ab94c6Eric SNir, just to make sure... this has been flagged for correction in the datasheet, right? Any idea how long for the updated datasheet to get published to the web, to avoid additional confusion with others? thank you.https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1661549/ts3a27518e-design-voltage-cjheck/6405670Mon, 06 Jul 2026 14:16:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9ab45fcb-670b-4860-85c6-7bf9d1679754Sham MaslishamThank you Katy .https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1661549/ts3a27518e-design-voltage-cjheck/6405665Mon, 06 Jul 2026 14:13:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2d124116-d6a2-465e-8463-312faf1fb97bKaty WestHi Sham, It should be fine to have 3.3V on the control pins while VCC is 1.8V. Best, Katyhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1661549/ts3a27518e-design-voltage-cjheckMon, 06 Jul 2026 13:54:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:979d49cb-6ab5-4be9-999a-e669258b79baSham MaslishamPart Number: TS3A27518E Hi , For part TS3A27518ERTW If pin 5 (Vcc) = 1.8V Can IN1 (pin11) , IN2(pin21) and nEN(pin17) connected directly to 3.3V from the controller? From the datasheet , I thikn should be fine - just like to double confirm . Many thanks ShamTS3A27518EAerospace &amp; Defensehttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1660415/sn74tvc3306-datasheet-inconsistency/6401917Wed, 01 Jul 2026 19:53:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2cef8868-2f31-4562-af8d-e96ac205457dNir GilgurHello Al, Figure 5-1 is wrong, figure 9-1 is the correct one. Thanks, Nirhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1660415/sn74tvc3306-datasheet-inconsistencyWed, 01 Jul 2026 19:02:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:ada64625-3af8-49ad-a505-fab6f77580faAl BPart Number: SN74TVC3306 Simplified schematic on page 1 and Figure 9-1 shows B1, B2, B3 as pins 7, 6, 5 respectively. Figure 5-1, however, shows B1, B2, B3 as 5,6,7. Which is correct?SN74TVC3306https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1660016/tmuxhs4412-tmuxhs4412----8-lanes-pcie4-gen4-mux-and-demux-solution/6401858Wed, 01 Jul 2026 18:53:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:dcdb92c7-aac5-47be-9cf0-7e131e370d37Nir GilgurHello Anita, For an 8-lane count I would say the TMUXHS4412 is our best option. The mux will introduce skew to the system and the customer needs check if it is feasible for their application. There will be a slight difference in the signal performance between them. The mux will introduce loss and parasitics to the line, but in a very minimal amount. The customer should evaluate it in their system and decide if it is acceptable for them. Thanks, Nirhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1658618/tmux7234-plateau-at-fast-rising-edge/6401697Wed, 01 Jul 2026 16:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:4f84b48a-e497-48f6-9c25-a6c82e4b6d5cArya HusseinHi Nikolas, Is there any specific differences in the layout of the board, would you be able to provide a image of the layout and schematic? Also was a off board test done on the units and anything showed abnormalities? Thank you, Aryahttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1658618/tmux7234-plateau-at-fast-rising-edge/6401430Wed, 01 Jul 2026 14:21:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:01e6a514-b576-4ad4-98ab-6702b9528eeeNikolas ZingrafHi Arya, I have testet a few devices, not many. In my first post I have also written the code the IC packages of the tested devices. The load was always the same. I have already tried if the behaviour is also present on other channels. It is but just much less. (see image 10, which shows input port 1B). Also the plateau only occurs on rising edges. You can see this in image 6 which shows steep rising and falling edges on port 4A. Regards, Nikolashttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1658618/tmux7234-plateau-at-fast-rising-edge/6401271Wed, 01 Jul 2026 12:09:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:3c82de69-1da3-4d43-863a-63b76a7952bdArya HusseinHi Nikolas, Would it be possible to have the load that is on input 4 to a different input pin? We can see if the behavior follows to another I/O pin. Also you have done multiple devices and are seeing the same issue? Thank you, Aryahttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1658618/tmux7234-plateau-at-fast-rising-edge/6400914Wed, 01 Jul 2026 06:39:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:6d31b2e6-1467-4d9c-a013-1423cef08062Nikolas ZingrafHI Arya, no the traces are kept pretty short. Also we have attached the signal generator more or less directly to the inputs with the same results. From our tests so far it seems like the chip itself has a problem on input Port 4. Did you ever encounter similar behaviour? Might it be just a batch issue? Regards Nikolas