I am using a TS5A3359 switch for a SPI interface that I am trying to control with 3 different devices (it's between an FPGA being programmed by memory, but I am also making it so it can be programmed by our processor or a test connector). Can you confirm that the propagation delay is the turn on/turn off time? Also, is there a maximum recommended frequency?
Thanks!
Russell
Russell,
The Ton and Toff specs are not the same as propagation delay.
The ton time is the time it takes from 50% voltage on digital logic pin to 90% voltage on the signal path that is selected. This could also be described as switching time.
Propagation delay for these type of passive switches is extremely quick because there isn't any buffering inside the signal path. The propagation delay is the time the signal can pass from the drain to the source of a FET.
This post shows common data rates and bandwidths
This shows for SPI application you need ~30MHz switch. The TS5A3359 75MHz will be plenty for your application.
SPI communication requires 4 channels. You will need 4x TS5A3359 (1-channel) devices to cover the SPI bus. Have you looked at using the TS3USB3031 which is a 2-channel 1:3 device? You will only need 2x TS3USB3031 to cover the 4 SPI lines.
Thank you,
Adam
