or outputs are changing. ICC active is the current flowing due to CMOS switching. IOL, IOH are TTL sink/source currents. VOL, VOH are TTL level output voltages. N equals the number of outputs driving TTL loads to VOL. M equals the number of outputs driving TTL loads to VOH. An accurate determination of N and M is problematical because their values depend.
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A1280A Datasheet
