TCAN1042-Q1: About operation when Vcc is 4.25 to 4.5V

Hello Kato-san,

The electrical and switching characteristics documented in the datasheet were characterized over the recommended operating voltage range, so they may not hold true for supply voltages below the recommended minimum (even though the device will still function as long as the supply voltage is above the undervoltage lock-out threshold). The parameters most strongly affected by the reduced voltage will be the driver output characteristics, since the output voltages will scale directly with VCC (see Figure 2 in the datasheet). Other parameters such as the timing characteristics may be slightly different as well as a result of the lower signal amplitudes.

Please let me know if you have any further questions.

Regards,
Max

Kato-san,

Because the recommended operating conditions state VCC needs to be 4.5V to 5.5V, all the test data available is for that range. So while the values of all these parameters that depend on the VCC level aren't readily available,  the parameters that are directly dependent on the level of VCC can be determined based on test data taken at VCC = 4.5V, VCC = 5.0V, and VCC = 5.5V.

Looking at the data, the only parameters that don't seem to be affected by a change in VCC voltage are:

• TXD IIH
• STB IIH
• tmode Normal to Standby
• IOS(SS_REC)
• VOD(Recessive)
• VIT
• Differential input resistance
• Input resistance
• VHYS (receiver)
• VHYS(UVvio)

The rest of the parameters in the datasheet are affected by the VCC level. I can't guarantee the performance at VCC = 4.25V since that is outside of TI's recommended operation conditions though.

Please let me know if you have any other questions or concerns.

Regards,