LSF0102: VOH, VIH, VOL , VIL levels

Vidhya J

Part Number: LSF0102

Tool/software:

Hi Team,

There are no VOH, VIH, VOL and VIL levels.

As these are opendrain supported, can I consider the following levels for electrical compatibility (interfacing with CPU GPIO, MDC, MDIO)?

Thanks,

Vidhya

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 316940 points

The LSF does not have input or output buffers. For voltages below Vref_A, the LSF works as an analog switch. For voltages above Vref_A, the switch is open, and the output voltage is determined by the pull-up resistor.

Please show the schematic, and show the test currents for which the CPU's and PHY's V_OL are specified.

0 Jack Guan over 1 year ago

TI__Mastermind 40656 points

Hi Vidhya,

The LSF-type translators do not specify logic threshold levels since no internal buffering circuitry. For VOL, it is dependent on the external pullups used + current that is being sunk into CPU side. Assuming high-Z inputs of downstream device, VOH is near output voltage that the external pullups is biased to.

See Factors Affecting VOL for TXS/ LSF and Logic Minute Videos on LSF for more info.

Regards,

Jack

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LSF0102: VOH, VIH, VOL , VIL levels