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The output of an OR gate goes high when any of its inputs A or B, etc. 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 74hc32 Figures 10 and 11 are eight-input standard types; and the 74HC is a input standard type.
Relatively few dedicated OR gate ICs are available.
Note that the fan-in of a TTL NOR gate is directly 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 Ways of cascading two-input OR gates to get up to five inputs.
Figure 24for example, shows ways of cascading two-input elements 74gc132 make OR gates with three, four, or five inputs, iic Figure 25 shows a three-input OR element and a three-input diode OR gate cascaded to make a compound five-input Id gate. Example of a compound five-input OR gate circuit.
Learning Electronics Need to brush up on your electronics principles? The simplest way to make an OR gate is via a number of diodes and a single 74jc132, as shown for example in the three-input OR gate of Figure Simple three input diode OR gate.
Six popular OR gate ICs.
Understanding Digital Buffer, Gate, and Logic IC Circuits – Part 3 | Nuts & Volts Magazine
These multi-part series may be just what you need! Just 74hc12 sure the buffer has a fan-in of one in the former case, and a fan-in of two in the latter.
In this case, the unwanted inputs can be disabled by either tying them high directly in CMOS gates, or via a 1K resistor in TTL types or by simply shorting them 74yc132 to a used input.
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 lists basic details of the six most popular OR gate ICs: Also note that OR gates can be directly cascaded to make 74hc32 compound OR gate with any desired number of inputs.
74h132 Part 4 Practical digital mixed gate and special-purpose logic gate ICs such as programmable logic, majority logic, and digital transmission gate types. Need to brush up on your electronics principles?