Digital Circuits & Design, 1st Education by Pearson

7.8 | Chapter 7

The output,

Qt()+1

of NAND-I gate depends on previous output,

Qt()

of NAND-II gate

and inverted input, R. The Boolean expression for NAND-I gate is given below:

Qt RQ t()+=

(

)

1 (7.7)

The output, Qt

()+

1 of NAND-II gate depends on previous output, Qt

()

of NAND-I gate

and inverted input, S. The Boolean expression for NAND-II gate is given below:

Qt SQ t()

()

+=1 (7.8)

Characteristic truth table is given in Table 7.5. Characteristic table gives relation between

inputs and outputs. Outputs of latch give two stable states following the complement rule

of each other.

TABLE 7.5 | Characteristics table of SR-ip-op with NAND gates

Inputs ...