Digital Circuits & Design, 1st Education by Pearson

Flip-Flops | 7.9

The output,

Qt()+1

of NAND-I gate depends on previous output,

Qt()

of NAND-II gate,

inverted input, R and input clock pulse, C

P

. The Boolean expression for NAND-I gate is

given below:

Qt RC Qt()+=

()

(

)

1

P

(7.9)

The output,

Qt()+1

of NAND-II gate depends on previous output,

Q

t

of NAND-I gate,

inverted input, S and input clock pulse, C

P

. The Boolean expression for NAND-II gate is

given below:

Qt SC Qt()+=

()

(

)

()

1

P

(7.10)

Characteristic truth table is given in Table 7.4.

7.3.5 | Characteristic Equation of SR-Latch

Characteristic Table 7.3 of SR latch is considered where Q(t), S and R are considered as

inputs and Q(t+1) is taken as ...