This part is a kind of semiconductor called 54279.

Function of this product has Quad Set-Reset Latch.

Manufacturers : National Semiconductor

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54279 DM74279 Quad Set-Reset Latch June 1989 54279 DM74279 Quad Set-Reset Latch General Description This device contains four independent set-reset type flipflops with one Q output each Connection Diagram Dual-In-Line Package TL F 9785 – 1 Order Number 54279DMQB 54279FMQB or DM74279N NS Package Number J16A N16E or W16A Pin Names Rn Sn Q Description Reset Inputs (Active Low) Set Inputs (Active Low) Outputs Truth Table S1 L L X H H Inputs S2 L X L H H R L H H L H Output Q h H H L No Change H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial h e The output is HIGH as long as S1 or S2 is LOW If all inputs go HIGH simultaneously the output state is indeterminate otherwise it follows the Truth Table C1995 National Semiconductor Corporation TL F 9785 RRD-B30M115 Printed in U [ ... ]

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