The F line label is used to indicate S-state logic. The S-state enable i:nput is labelled with an F and numerals or letters are used as with the G label:

C o u n t e r w i t h

 

3-State O u t p u t s

3 - S t a t e B u f f e r s

-

>

CTR

I--i’-

c

F

4

Fl

U6A

-

 

R

 

 

 

 

XT

 

 

 

 

(1)l-

(2)’ -

(4)’ -

(8)’ -

Figure 6. Schematic Symbols for Digital Integrated Circuits (7 of 7)

Weighting of Input and Output Lines

The coding of multiplexers, demultiplexers, encoders, and decoders is shown by decimal weighting. An example is the 2-to-4-line decoder shown on the previous page.

Weighting of Flip-Flops

When the position of a flip-flop in an array is significant (as in counters and shift registers), the flip-flop is labelled with its decimal weight. An example is the “Counter with S-State Outputs” shown above.

General Information 19