Fairchild Semiconductor

Dual Negative-Edge-Triggered Master-Slave J-K Flip-Flop with Preset, Clear, and Complementary Outputs

Motorola => Freescale

Dual JK negative edge-triggered flip-flop

Fairchild Semiconductor

Dual Negative-Edge-Triggered Master-Slave J-K Flip-Flop with Preset, Clear, and Complementary Outputs

Motorola => Freescale

Synchronous Decade Counters(direct clear)