Could you please let me know, what is the Voh(min) ?, if VCCB=1.8V for SN74AVC2T245RSWR device

tatarao kuramdasu

Intellectual 435 points

HI,

Could you please let me know, what is the Voh(min) ?, if VCCB=1.8V for SN74AVC2T245RSWR device.

regards,

TataraoK

9059058519

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 316780 points

The test conditions are for the worst case, when the power supply is not perfect. Therefore, the values for a nominal 1.8 V supply are measured at 1.65 V.

V_OH(min) = 1.2 V at I_OH = –8 mA

0 tatarao kuramdasu over 4 years ago in reply to Clemens Ladisch

Intellectual 435 points

Ok, but if supply voltage is 1.8V, what will be the VOH(min)?.

It will be more then 1.2V only, but need some expected value for my Logic analysis.

0 Clemens Ladisch over 4 years ago in reply to tatarao kuramdasu

Guru 316780 points

You could use linear interpolation; see [FAQ] What method is best used for estimating specification values between those given in the datasheet?

Can you really guarantee that your power supply provides 1.8 V ± 0.000 %?

0 Emrys Maier over 4 years ago

TI__Guru* 97046 points

You can do a quick estimate within the same supply range by just adding the voltage difference of the supply to the VOH value. In this case, you're going from 1.65V to 1.8V, so you'd expect 1.2V to become 1.35V.

The reason this works is that VOH is really measuring a voltage drop across the positive driver at the output (Vcc - VOH), which is caused by the current flowing through the impedance of that driver. The driver impedance won't change much between 1.65V and 1.8V (it will decrease a bit in that range), so this is a very safe method of estimation.

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Could you please let me know, what is the Voh(min) ?, if VCCB=1.8V for SN74AVC2T245RSWR device