74HC7403 Просмотр технического описания (PDF) - NXP Semiconductors.

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74HC7403

4-bit x 64-word FIFO register; 3-state

NXP Semiconductors. 

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Fig 4.

LOW on S input of the flip-flops FS, FB and FP sets Q output to HIGH independent of state on R input

LOW on R input of FF1 to FF64 sets Q output to LOW independent of state on S input

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