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What is a Standard Logic IC?

Basic logic gates are available from multiple manufacturers as industry-standard ICs, which are functionally and pin-compatible. These ICs are called standard logic ICs.
Standard logic ICs from different manufacturers are housed in pin-compatible packages, except some small packages.
Standard logic ICs with the same function number provide the same function and pin assignment.

【Reference: Function numbers of typical standard logic ICs】
The function numbers of standard logic ICs are predefined according to the function, number of circuits, input logic, and output logic.

Function number	Function name
00	Quad 2-input NAND
02	Quad 2-input NOR
04	Hex Inverter
05	Hex Inverter (Open-Drain)
07	Hex Buffer (Open-Drain)
08	Quad 2-Input AND
14	Hex Schmitt Inverter
17	Hex Schmitt Buffer
21	Dual 4-Input AND
32	Quad 2-Input OR
74	Dual D-Type Flip-Flop with Preset and Clear
86	Quad Exclusive OR

Function number	Function name
123	Dual Monostable Multivibrator
125	Quad Bus Buffer (3-State)
138	3-to-8 Line Decoder
157	Quad 2-Channel Multiplexer
164	8-Bit Serial-In / Parallel-Out Shift Register
244	Octal Bus Buffer (3-State)
245	Octal Bus Transceiver (3-State)
273	Octal D-Type Flip-Flop with Clear
373	Octal D-Type Latch (3-State)
541	Octal Bus Buffer (3-State)
574	Octal D-Type Flip-Flop (3-State)
595	8-Bit Shift Register/Latch (3-State)