How do I read the output drive current charts in the datasheet?
A customer asks; do I understand the drive current chart? The current range shown in the graph seems excessive to me because a pin group is to handle 80mA total.
drive_current
hardware
output
current
The drive current charts show how the driver characteristics change with DC loading for a typical part. The rise and fall time charts show the effects of capacitive AC loading for a typical device. They are an indication of drive strength for each of the output types listed in the pin description table.
The output characteristics change from part to part. The behavior shown in these graphs is not guaranteed in all products.
The current scale may go as high as 200ma on some outputs of some processors. These high current values do not represent usable logic voltages. For example, in the attached file, at -90MA, so much current is flowing into the driver that the output low has raised in voltage to a logical high. These values are not intended to represent normal operating conditions.
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