SN74LVC1G125: VOL and VOH when VCC is 1.8V

David Zhao

Intellectual 1820 points

Part Number: SN74LVC1G125

Hi,

When VCC is 1.8V, what is spec for VOH and VOL? Thanks!

Regards

David

over 8 years ago

0 Emrys Maier over 8 years ago

TI__Guru* 97046 points

Hi David,

The values specified by 'Vcc = 1.65V' are for a standard voltage supply of 1.8V +/- 0.15V. 1.65V is the worst case for this, so the values are specified there. You can directly apply the drop on the output to 1.8V.

For example, at V_CC=1.65V, I_OH = -4mA, T_A = -40C to 85C, V_OH = V_CC - ΔV_O = 1.2V, ΔV_O = 1.65V - 1.2V = 0.45V

ΔV_O will be the worst case at 1.65V, so we can use that value for 1.8V:

At V_CC=1.8V, I_OH = -4mA, T_A = -40C to 85C, V_OH = V_CC - ΔV_O = 1.8V - 0.45V = 1.35V

0 David Zhao over 8 years ago in reply to Emrys Maier

TI__Intellectual 1820 points

Hi Emrys

Thanks for feedback! So for VOL, is it similar? For 1.8V and IOL=4mA, ΔV_{O=1.65-0.45=1.2, then VOH=1.8V-1.2V=0.6V, right?}

Regards

David

0 Emrys Maier over 8 years ago in reply to David Zhao

TI__Guru* 97046 points

For V_OL, the difference is from ground instead of from V_CC, so a 0.45V V_OL rating should still be 0.45V at V_CC = 1.8V.

Logic

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SN74LVC1G125: VOL and VOH when VCC is 1.8V