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| PartNumber | 54LS109DM | 54LS109DM+ | 54LS109DMQB |
| Description | J-K Flip-Flop, 2-Func, Positive Edge Triggered, TTL, CDIP16 | Flip Flop, Dual, J/K Type, 16 Pin, Ceramic, DIP | J-Kbar Flip-Flop, LS Series, 2-Func, Positive Edge Triggered, 2-Bit, Complementary Output, TTL, CDIP16 |