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The SN7400N chip contains four two-input NAND gates. The SN prefix indicates it was manufactured by Texas Instruments [1] 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. [2]
English: The view and element placement of the popular chip 7400. The chip contains four logical elements AND-NOT (NAND). The two additional contacts supply power (+5 V) and connect the ground.
A suffix letter or number may be used with the device number; for example, suffix N is used if the device is connected to a Neutral wire (example: 59N in a relay is used for protection against Neutral Displacement); and suffixes X, Y, Z are used for auxiliary devices.
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Until 2021, the IOC used the code ZZX for mixed teams. [5] [19] [b] In 2021, the code was changed to MIX, matching the code for mixed teams at the Youth Olympics. [20] In 2024, the code was changed to XXB. [21]
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On January 1, 2025, at around 3:15 a.m. CST (), Shamsud-Din Jabbar drove a pickup truck into a crowd on Bourbon Street in New Orleans, Louisiana, United States, then exited the truck and engaged in a shootout with police before being fatally shot.