AM26C32: Question about VID, VIT+, VIT- definition and Function Table

NOBUO FUJIHARA

Expert 8905 points

Part Number: AM26C32

Hi Team,

I would like to confirm about below basic things related to Table 1, could you answer those?

(1) May I think VID definition as below?

VID = “Input voltage on A” – “Input voltage on B”

(2) DIFFERENTIAL INPUT in Table 1, VID >= VIT+

VIT+ is defined as 200mV as max (with VIC=-7V to 7V).

IF G=H, and VID (in above definition) > 200mV, will OUTPUT be H?

(3) DIFFERENTIAL INPUT in Table 1, VIT < VID < VID+

Regardless G or nG setting, if VID is between VIT- and VID+, will the OUTPUT undefined?

Best regards,

over 5 years ago

0 Eric Schott1 over 5 years ago

TI__Guru 51845 points

Hi Nobuo-san,

(1) VID = “Input voltage on A” – “Input voltage on B”
Yes, this is the correct definition: V_ID = V_A - V_B

(2) IF G=H, and VID (in above definition) > 200mV, will OUTPUT be H?
Yes. When the device is enabled (G=H or nG=L) and the input differential is above the defined threshold (V_ID ≥ V_TH+), the output will be high (Y=H).

(3) Regardless G or nG setting, if VID is between VIT- and VID+, will the OUTPUT undefined?
When the device is enabled (G=H or nG=L) and the input differential is between defined thresholds (V_TH- ≤ V_ID ≤ V_TH+), the output is undefined (Y=?). If the device is disabled (G=L and nG=H) and the same conditions appear on the input differential (V_TH- ≤ V_ID ≤ V_TH+), the output will be high-z (Y=Z). This is because in this enable state (G=L and nG=H) the input differential is a don't-care (x).

I hope this helps. Let me know if you have any more questions.

Regards,
Eric

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AM26C32: Question about VID, VIT+, VIT- definition and Function Table