24 q d pulse triggered jk flip flop characteristics

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Unformatted text preview: 1 1 1 1 K 0 0 1 1 0 0 1 1 Q 0 1 0 1 0 1 0 1 (a ) C Q* 0 1 0 0 1 1 1 0 1 d0 Figure 6.25 Q* = K′ Q + JQ′ Pulse-Triggered JK Flip Realization KQ K J JQ C (b ) (a ) C Q Q Q* D Q Q J C K Q Q Figure 6.26 The SN7476 Dual Pulse-Triggered JK Flip-Flop '7 6 1PRE 1J 1CLK J C K Q CLR (a ) PRE Q Q Q 2PRE 2J 2CLK 2K 2CLR 1K 1CLR (2 ) (4 ) (1 ) (1 6 ) (3 ) S 1J C1 1K R (1 5 ) 1Q (1 4 ) 1Q (7 ) (9 ) (6 ) (1 2 ) (8 ) (1 0 ) 2Q (1 1 ) 2Q (b ) Figure 6.27 SN7474 Dual Positive-Edge-Triggered D Flip-Flop '7 4 PRE 1PRE 1CLK CLR Q Q Q CLK Q CLR (b ) D (a ) (c) PRE Q Q 1D 1CLR (4 ) (3 ) (2 ) (1 ) S C1 1D R (5 ) 1Q (6 ) 1Q 2PRE 2CLK 2D 2CLR (1 0 ) (1 1 ) (1 2 ) (1 3 ) (9 ) 2Q (8 ) 2Q Figure 6.28 SN7474 Excitation Table In p u ts PRE L H L H H H CLR H L L H H H D × × × H L × CLK × × × ↑ ↑ L Q O u tp u ts Q L H H L H Q0 M ode S et C le a r N o t a llo w e d C lo c k e d o p e ra tio n C lo c k e d o p e ra tio n H o ld H L H H L Q0 Figure 6.29 SN7474 Flip-Flop Timing Specifications T o O u tp u t Q fro m : D sh o u ld b e s ta b le th D tsu tsu C lo c k PRE th CLR D e la y P a ra m e te r tP LH tP H...
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