Hi Said,
I usually would recommend a unidirectional solution for SPI such as SN74AVC4T774, but LSF0204 will work in most cases.
1- The SPI is shared with other devices such as an EEPROM and digital transceiver (5V) and the level translator is meant…
The waveforms show that the pull-up resistors are too large (there is not enough current to quickly (dis)charge the parasitic capacitances). If you use smaller pull-up resistors, then the driving devices must be able to sink more current.
When you have…
SPI_VOLT_TRANS_PAGE (2).pdf Hi Emrys,
Many thanks.
But the 100MHz is our max supporting frequency, so we are also checking SN74AVC4T774, so whether we can support the loss or trace length of pre-channel and post-channel of SN74AVC4T774 and LSF0108…
Shreyas,
I have an IOT device that works on 1.8V and on it I have the TXB0104, it can't be mounted closer to the Beaglebone. The Beaglebone ackts like a docking for data download from the IOT device
I wanted to use LSF because its the same footprint…
Hi Chen,
The TXB is suited for SPI communication as the device is auto-bidirectional in nature.
You could also consider using the SN74AXC8T245 or the SN74AVC4T774 for this.
In your block diagram, how is the control of each of the TXB device done…
Hi,
Thanks for the reply.
Can I use any translators ( like, SN74AVC4T774 or TXB0104) ?
If yes, is there any translators with Ioh= 32mA and Iol=64mA?
Regards
Madhu
Hi Antony, Not connecting the EN and Vrefb through the 200kohm is definitely a problem which needs to be fixed. The bias point is not fixed when you have 200k on Vrefb but not on En. The transistors are biased at 3.3 when En is directly connected instead…
Other Parts Discussed in Thread: SN74AVC4T774 Hello,
I'm working with CC256xQFN-EM Rev 1.2B, and would like to connect it to my STM32F40x EVB. My platform works with 3.3V I/O, so I need to use Level Shifters on CC256xQFN-EM (SN74AVC4T774's).
Following…
Hi Shu-Cheng,
Please refer to the app note on the working of TXB devices:
www.ti.com/.../scea043.pdf
I see on the schematic page 2 that the TXB0104(SU140 and SU139) has been listed as having internal 10k pullup resistance on A /B ports. This is…
Hi Jani
I would recommend something like the SN74AVC4T774 to drive the ADC logic inputs.
It is a device with 4 voltage converting buffers that can be individually selected for direction. A and B ports can have voltages specific to the upstream and…
