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74LS273 replacement chip. DIP-20. Octal D-type flip-flop with clear.
The following arcade games and pinball machines use the 74LS273 on their PCBs:
The following represents the pinout of the 74LS273N in a DIP-20 package, commonly used in arcade and pinball machines.
You can find the datasheet for the 74LS273 here: 74LS273 datasheet