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Example of a compound five-input OR gate circuit.
The output of an OR gate goes high when any of its inputs A or B, etc. Ways of cascading two-input OR gates to get up to five inputs.
Six popular OR gate ICs. Figure 24for example, shows ways of cascading two-input elements to make OR gates with three, four, or five inputs, and Figure 25 shows a three-input OR element and a three-input diode OR gate cascaded to make a compound five-input OR gate.
Understanding Digital Buffer, Gate, and Logic IC Circuits – Part 3 | Nuts & Volts Magazine
These multi-part series may be 74hc1132 what you need! The simplest way to make an OR gate is via a number of diodes and a single resistor, as shown for example in the three-input OR gate of Figure Part 4 Practical digital mixed gate and special-purpose logic gate ICs such as programmable logic, majority logic, and digital transmission gate types.
The 74LS10 and B see Figures 6 and 7 are triple three-input standard types; the 74LS20 and B see Figures 8 and 9 are dual four-input standard types; the 74LS30 and B see Figures 10 and 11 are eight-input standard types; and the 74HC is a input standard type. Learning Electronics Need to brush up on your electronics principles?
Also note that OR gates can be directly cascaded to make a compound OR gate with any desired number of inputs.
Note that the fan-in of a TTL NOR gate is oc proportional to the number of inputs used — at a fan-in rate of one per input — and that a TTL two-input OR gate can be made to act as a simple non-inverting buffer by either tying one input to ground or by tying both inputs together, as shown in Figure The diode OR gate is reasonably fast, very cost-effective, and can readily be expanded to accept any number of inputs by simply adding one more diode to the circuit for each new input.
Figure 17 74gc132 basic details of the six most popular OR gate ICs: Simple three input diode OR gate.
Need to brush up on your electronics principles? In this case, the unwanted inputs can be disabled by either tying iic high directly in CMOS gates, or via a 1K resistor in TTL types or by simply shorting them 74nc132 to a used input. Just make sure the buffer has a fan-in of one in the former case, and a fan-in of two in the latter.
Relatively few dedicated OR gate ICs are available.