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History
7400-series integrated circuits
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The 7400 series is a popular logic family of transistor–transistor logic (TTL) integrated circuits (ICs).
The SN7400N chip contains four two-input NAND gates. The SN prefix indicates it was manufactured by Texas Instruments The N suffix is a vendor-specifi
The SN7400N chip contains four two-input NAND gates. The SN prefix indicates it was manufactured by Texas Instruments The N suffix is a vendor-specific code indicating plastic DIP packaging. The second line of numbers (7645) is a date code; this chip was manufactured in the 45th week of 1976.
Texas Instruments SN5451 in the original flat package
Texas Instruments SN5451 in the original flat package
Die of a 74AHC00D, manufactured by NXP
Die of a 74AHC00D, manufactured by NXP
SN7400 die in the original flat package, manufactured by TI
SN7400 die in the original flat package, manufactured by TI
Transistor–transistor logic
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Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Its name signifies that transistors perform both the logic function and the amplifying function, as opposed to earlier resistor–transistor logic (RTL) and diode–transistor logic (DTL).
A real-time clock built of TTL chips around 1979
A real-time clock built of TTL chips around 1979