Other Parts Discussed in Thread: SN74AXC8T245
Hello,
Is it possible to use the SN74AVC32T245 with VCCa=1.2V?
The 1.2V in my card has 5% tolerance, Is it OK?
The datasheet doesn't mention the VCC tolerance when it's 1.2V.
Thank you,
David
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Hello,
Is it possible to use the SN74AVC32T245 with VCCa=1.2V?
The 1.2V in my card has 5% tolerance, Is it OK?
The datasheet doesn't mention the VCC tolerance when it's 1.2V.
Thank you,
David
Hi,
No, I can't change the nominal voltage.
Can you please recommend another small package level shifter for 1.2V ?
Thank you,
David
Hi David,
The new AXC voltage translator family supports down to 0.65V, but only has up to 8 channels per device. You could use four of these: SN74AXC8T245
Otherwise, you could use the SN74AVC32T245, as it would mostly likely continue to function at the reduced voltage, but you would be doing it "at your own risk" as TI doesn't guarantee that the device will operate at 1.14V.
Hi,
I can change it to the SN74AXC8T245.
What is the maximum output current (Ioh, Iol) in the SN74AXC8T245 when vcco=3.3V?
II didn't find it in the datasheet.
Thank you,
David
Hey David,
The absolute maximum output current for a single channel is 50mA (ie you should never exceed that):
The test output current for the low and high states (I_OH, I_OL) are in the V_OH and V_OL spec:
From above, the device can output 12mA at 3.3V while maintaining V_OL ≤ 0.7V and V_OH > 2.6V
I adjusted V_OH from 2.3V to 2.6V because it's directly related to the supply value (ie the voltage drop across the pFET at the output). The below linked FAQ goes into detail on this.