ISOW7842: can we use this part as input 3.3 and output 5V

Please let me know the difference between ISOW7842 and ISOW7841 in the aspect of why it doesn't support 3.3V Input, 5V Output operation.

Please share sample design or pin details how it needs to be connected

Hi Nishalini,

Nishalini Baskaran said:

Please let me know the difference between ISOW7842 and ISOW7841 in the aspect of why it doesn't support 3.3V Input, 5V Output operation.

First thing - We don't share device level details publicly. Second - ISOW7842 is 2 Forward and 2 reverse channels, this changes the supply current requirements which is not guaranteed and supported by the integrated DC-DC converter.

Nishalini Baskaran said:

Please share sample design or pin details how it needs to be connected

Please refer datasheet for these details. We also have the ISOW7841 EVM for sample connection. It's basically the SEL pin that needs to be HIGH with 3.3V Input. We don't have a separate sample design for this mode. You can refer section 10.2 in datasheet for design considerations in general as well.

Let us know if you have any further questions or doubts on working of the device in 3.3V Input and 5V Output.

Regards
Varun

Thanks for the reply, Varun

Please confirm whether we can use ISOW7841 as 3.3V Input and 5V Output 

Hi Nishalini,

SEL pin being HIGH means connected to Viso and LOW means connected to GND2. 

Nishalini Baskaran said:

also i hope the difference between ISOW7842     and ISOW7841 is direction of channels. Please check and confirm on the same.  

I have already mentioned this above, please read through my reply once - ISW7842 is 2 Forward and 2 Reverse Channel where as ISOW7841 is 3 Forward and 1 reverse channel.

Nishalini Baskaran said:

Please suggest a part number for 4 channels, input 3.3V and output 5 

Can you please be more specific in your requirements and questions here. Do you need with Isolated Power integrated or you're asking for a normal digital isolator? Also, what is your channel configuration requirement in terms of forward and reverse channels?

Regards
Varun

Thanks for the reply varun 

Please suggest an isolator with 3.3V Input and 5V Output and all other specs as same as ISOW7842

Number of Channels:4
Inputs - Side 1/Side 2: 2/2
Channel Type: Unidirectional
Voltage - Isolation:5000Vrms
Common Mode Transient Immunity (Min):100kV/µs
Data Rate:100Mbps
Propagation Delay tpLH / tpHL (Max):17.6ns, 17.6ns
Pulse Width Distortion (Max):4.7ns
Rise / Fall Time (Typ):2ns, 2ns
Voltage - Supply:3V ~ 5.5V
Operating Temperature: -40°C ~ 125°C

Hi Varun,

Can you please suggest an exact alternate for ISOW7842 and my main requirement is power and 2 Forward and 2 Reverse Channel

Hi varun ,

Will these parts ISOW7840, ISOW7843, ISOW7844 supports 5V input and 3V output operation?