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Logic Circuit Blocks
Al'l1), OR, and Inverter Circuits
The basic logic blocks (Figure 46) are the AND (A),
OR (OR), and the inverter (N).
Almost all other cir.,.
cuits can be built from'a combination of these basic
circuits. Specifically:
A!\1> circuits (either diodes or transistors) have
the designated output when all inputs are at the
desig,11ated le\'el.
OR circuits (either diodes or transistors) have
the designated output when one input is at the
designated leyel.
Inyerters change the line from one le\-el to the
other as designated. (The im'erter is really an
AI\1> circuit with one input.)
Bi -Stable Ci rcuits
The basic SLT logical storagE: blocks (Figure -!7) are
the flip flop (FF). the flip latch (FL). and the polarity
hold (PH). Each may be a single circuit or a com-
bination of individual AND, OR. and inverter circuits.
Singles hot and Oscillator Circuits
The basic timed storage block (Figure 48) is the
singleshot. The oscillator produces crystal-
controlled timing pulses.
Driver Terminator Circuits
A need for varied circuits exists in all machines.
Some of these circuits are (Figure 49): indicator
and relay drivers, line terminators, converters,
and integrators.
Combination Circuits
Circuits may be combined to provide a particular
need or function.
The~e
combinations may be:
t:/-
Figure 48. Singleshotand Oscillator
e"iA
I
I
ITO* 1 - - - -..
I
A'I
i
-'G~I
I
Li~
i
n
ITO_
Do~----.oO-a4~S~
I-
I
MI
I
I
AC'
.. - - - - 1 .
I
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,
i
, .... -_,
'15"-"'"
,
•
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-JA
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I
'TOlAC I--.J
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,
Rei
-I
lJ-f'4
I
Figure
-Hi.
A~D,
OR, Inverter
Figure 47. Flip FI?p and Flip Latch
36
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