Line Labels

 

 

 

+

Shift Left (or up)

 

+

Shift Right (or down)

 

+1

Count Up

 

 

- 1

Count Down

 

 

=0,-l

Borrow Output

 

=9,+1

Carry

Output

(Decimal

Counter)

=15,+1

Carry

Output

(Binary

Counter)

An

nth Address Bit (ROM, RAM)

c

Clock Input

 

 

D

Data or Delay Input (Flip-Flop)

Dn

nth Data Bit Input

 

EN

Enable

 

 

 

F

3-State Enable Input (See “Dependency”)

G

Gating

Input

(See “Dependency”)

J

J-K Flip-Flop J Input

 

K

J-K Flip-Flop K Input

 

LD

Load Enable Input (Synchronous)

PS

Preset

Input

(Asynchronous)

R

Reset or Clear Input

 

R D

Read Enable Input (RAM, ROM)

S

Set Input

 

 

SEL

Line or Function Select Input

SER

Serial Data Input (Shift Register)

T

Trigger Input

(Monostable)

W R

Write Enable Input (RAM)

Y n

nth Data Bit Output or I/O

3-ST

3-State

 

 

 

(placed

by

 

 

 

function

label)

 

 

 

 

 

 

 

 

Figure 6. Schematic Symbols for Digital Integrated Circuits (4 of 7)

16 General Information