Pack a lot of logic into a little space with a Logipac!
The Logipac module consists of a pair of 3-input, triple-function Boolean
Gate sections, and a pair of D-type Flip-Flop sections. All inputs feature
our anything-to-logic input circuitry which allows slow-moving waveforms
(like sine waves) to behave like logic signals. The only requirement is
that they cross +1V somewhere in their cycle.
Logic Gates
The Boolean Gate sections feature 3-inputs rather than the usual 2, which
greatly increases their versatility and allows for the patching of more
complicated logical functions with fewer modules. The 3-inputs are
processed by logical AND, OR, and EXCLUSIVE OR (EXOR) functions
simultaneously, and each function has it's own output jack and corresponding
LED.
(To use the gates as 2-input functions, just use 2 inputs of the OR and EXOR
with input 3 left unused. The AND requires the unused input be patched
together with one of the used inputs.)
The 3-input EXOR functions as an odd / even parity generator. If an odd
number of inputs are high, the output is high, and if an even number of
inputs are high, the output is low. You can cascade this operation into the
other EXOR gate and pick up 2 more inputs. You can also use the EXOR
function as a logic inverter. Patch one input high and patch the signal to
be inverted into another input. Check out the truth (table that is):
C |
B |
A |
AND |
OR |
EXOR |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
1 |
0 |
1 |
0 |
0 |
1 |
1 |
0 |
1 |
1 |
0 |
1 |
0 |
1 |
0 |
0 |
0 |
1 |
1 |
1 |
0 |
1 |
0 |
1 |
0 |
1 |
1 |
0 |
0 |
1 |
0 |
1 |
1 |
1 |
1 |
1 |
1 |
Flip-Flops
The D-type Flip-Flops are 1-bit memory storage devices with various ways to
acquire the bit and turn it on and off. Applications are best understood by
understanding what signals are coming and going.
[Q] and [NOTQ] Q-bar (pronounced Not Q or Q Bar)
These are the outputs. Q is the bit, either on or off and NOTQ is its
logical inverse (when Q is on, NOTQ is off and vice-versa).
[S] SET
A high level at this input will latch Q high (NOTQ low)
[R] RESET
A high level at this input will latch Q low (NOTQ high)
Bringing both SET and RESET high simultaneously is undefined and will
produce unpredictable results. It's like trying to force a see-saw to be
both ways at once. When SET and RESET are brought low again, the one to
fall last will be remembered.
[C] CLOCK and [D] DATA
The CLOCK and DATA inputs work together. The CLOCK is edge sensitive and
when brought high, the state of the DATA input is latched into Q. That is,
Q will equal DATA when CLOCKed.
There, that's not so complicated, is it?
[ Flip-Flop Applications ] - Things you can do with them?
MODCAN A-SERIES
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