Unlike diodes, the outputs of typical CMOS logic ICs cannot be wired-ORed together, except those with three-state outputs. Even in the case of CMOS logic ICs with three-state outputs, unintended current might flow, causing IC degradation, if they are enabled simultaneously. When creating a circuit design, ensure that multiple outputs will not be enabled at any given time. Also, the outputs of CMOS logic ICs without bushold become unstable if all of them are disabled (i.e., assume the High-Z state) without being pulled up to VCC or down to GND.
Only the gates in the same package may be wired-ANDed to increase the drive capability (i.e., output current). However, it is recommended to use high-drive ICs (with an IO of ±24 mA) instead.
The following documents also contain related information:
Basics of Bus Switches
CMOS Logic ICs Usage Considerations
Basics of CMOS Logic ICs
CMOS Logic Ics Standard series
CMOS Logic Ics TC74VCX/LCX Series
CMOS Logic Ics TC74HC/HCT Series
CMOS Logic Ics TC74VHC/VHCT/VHC9/VHCV Series
CMOS Logic Ics TC74AC/ACT Series
Glossary of CMOS Logic ICs
Is it OK to leave unused outputs of general-purpose CMOS logic ICs open?
How many amperes of current can an output pin drive?
Is it OK to leave the bus terminal (input/output) pin of a bidirectional bus buffer open when it is floating?
Do bidirectional bus buffers have any constraints on the timing of the direction (DIR), bus, and other signals?
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