By THORN EMI Television Rentals Group Technical Training Department (auth.)

ISBN-10: 0333364155

ISBN-13: 9780333364154

ISBN-10: 1349070777

ISBN-13: 9781349070770

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Additional resources for An Introduction to Digital Techniques: Logic gates, Flip-flops, Counters and Shift registers

Sample text

2. The solution is on page 60. 65 is an exercise. Draw in the Q output. The solution is on page 60. --- ....... Io- R input L-t I H Q output 58 I L I. I 1_1 i -+ -l I I -L+,-;-+-----+_ _...... ~ I I I I I LJ J ~ I I ~ I I I 1_ -1-_ J-K FLIP-FLOP EXERCISE ANSWERS. A). With J and K 'low' gates g1 and g2 both have at least one 'low' input and so their output is 'low'. The 'Master' FLIP-FLOP is therefore neither Set nor Reset and so the Q output remains unchanged. B). For the same reason as A, the Q output remains unchanged.

VT 45 collector falls and so has insufficient voltage on its collector to bias VT 44 on. The bistable has changed state: VT44 is off, VT45 is on. W42 is now reverse biased and W43 is forward biased. The next pulse will therefore pass via W43 to switch VT45 off. The bistable changes state with each input pulse. This is known as toggling. L - - SOUND MUTE BISTABLE----I Fig. 9 VT45 off and VT44 on. d vr44 0I( vr4S on C52 C53 P--r:nl liP L - - SOUND MUTE BISTABLE----I 37 R-S FLIP-FLOPS from logic gates Fig.

Complete the truth tables for the following combinations and work out the type of gate they could replace. Inputs A 8 L Outputs Inputs X A 8 L L L L H L H H L H L H H H H C D _ _ gate Outputs C D X ___ gate A c x D----B 30 x Fig. 77 Exercise 7. Fig. 78 Exercise 8. Inputs A B L Outputs Inputs X A B L L L L H L H H L H L H H H H C D E gate Outputs C Exclusive D E F X gate A---------------4. , 31 A synopsis of gate symbols Gate type . DjfV- ]VInputs 32 Output Output Output Output Output Output Output L L L L H H H L L H H L L H H H L H L L H H H H H H L L L A B L X X X H X L X X X Par t 2 Flip-flops INTRODUCTION.

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An Introduction to Digital Techniques: Logic gates, Flip-flops, Counters and Shift registers by THORN EMI Television Rentals Group Technical Training Department (auth.)


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