Add Time for SN7482 Adder Circuits

SN7482 propagation delays

t?1 = 5 tgate

tC1 = 2 tgate

t?2 = 6 tgate

tC2 = 4 tgate

SN7482-based ripple-carry adder (n-bits)

tadd = (2n + 2) tgate

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