Hallo,
na nun will ich nochmal etwas zur Verwirrung beitragen
OK ... ich gebs zu ... es ist ein alter AT90S4433. Vorgänger vom Mega8
Gruß
Dino
na nun will ich nochmal etwas zur Verwirrung beitragen
aber woher stammt diese Behauptung eigentlich? Laut Datenblatt des Mega8 sind als abs.max DC-Current pro I/O 40mA und 300mA für alles angegeben. Ohne die Richtung zu berücksichtigen.
Als test-condition werden dann 20mA (bei 5V) angegeben - in beiden Richtungen. Das sind die garantierten Werte.
Notes:
1. “Max” means the highest value where the pin is guaranteed to be read as low (logical “0”).
2. “Min” means the lowest value where the pin is guaranteed to be read as high (logical “1”).
3. Although each I/O port can sink more than the test conditions (20 mA at VCC = 5.0V, 10 mA at VCC = 3.0V) under steadystate conditions (non-transient), the following must be observed:
. . 1] The sum of all IOL, for all ports, should not exceed 300 mA.
. . 2] The sum of all IOL, for ports C0 - C5, should not exceed 100 mA.
. . 3] The sum of all IOL, for ports B0 - B5, D0 - D7 and XTAL2, should not exceed 200 mA.
. . If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test condition.
4. Although each I/O port can source more than the test conditions (3 mA at VCC = 5.0V, 1.5 mA at VCC = 3.0V) under steadystate conditions (non-transient), the following must be observed:
. . 1] The sum of all IOH, for all ports, should not exceed 300 mA.
. . 2] The sum of all IOH, for ports C0 - C5, should not exceed 100 mA.
. . 3] The sum of all IOH, for ports B0 - B5, D0 - D7 and XTAL2, should not exceed 200 mA.
. . If IOH exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to source current greater than the listed test condition.
5. Minimum VCC for Power-down is 2.0V.
OK ... ich gebs zu ... es ist ein alter AT90S4433. Vorgänger vom Mega8
Gruß
Dino