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Integrated injection logic (IIL, I 2 L, or I2L) is a class of digital circuits built with multiple collector bipolar junction transistors (BJT). [1] When introduced it had speed comparable to TTL yet was almost as low power as CMOS , making it ideal for use in VLSI (and larger) integrated circuits .
[2] [3] In the mid 1950s, diode logic was used in the IBM 608 which was the first all-transistorized computer in the world. A single card would hold four two-way circuits or three three-way or one eight-way. All input and output signals were compatible. The circuits were capable of reliably switching pulses as narrow as one microsecond ...
The left diagram above show the construction of a 2-input NOR gate using NMOS logic circuitry. If either of the inputs is high, the corresponding N-channel MOSFET is turned on and the output is pulled low; otherwise the output is pulled high through the pull-up resistor. In the CMOS implementation on the right, the function of the pull-up ...
2 dual 4-input NOR gate with strobe, one gate expandable with 74x60 16 SN7423: 74x24 4 quad 2-input NAND gate Schmitt trigger 14 SN74LS24: 74x25 2 dual 4-input NOR gate with strobe 14 SN7425: 74x26 4 quad 2-input NAND gate open-collector 15 V 14 SN74LS26: 74x27 3 triple 3-input NOR gate 14 SN74LS27: 74x28 4 quad 2-input NOR gate driver N O =30 ...
One example is the Philips NORBIT family of logic building blocks. The PMOS and I 2 L logic families were used for relatively short periods, mostly in special purpose custom large-scale integration circuits devices and are generally considered obsolete. For example, early digital clocks or electronic calculators may have used one or more PMOS ...
A logic circuit diagram for a 4-bit carry lookahead binary adder design using only the AND, OR, and XOR logic gates.. A logic gate is a device that performs a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output.