Tascam 133-B - 3-2. MULTIPLEXER OF OPERATING KEY SIGNALS

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133-8
&
3-2.
MULTIPLEXER
OF
OPERATING
KEY
SIGNALS
_
The
pin
assignments,
logic
diagram,
and
truth
table
of
multiplexer
IC
U912
(SN74LS151)
are
given
below.
ia 2 ot io 862 Z E ono .
Fig.
3-2.
Pin
arrangement
of
IC-U912
Description
Input of fast-forward command
Input of record command
Input of rewind command
Input of stop commatid
(Unused)
--@perating
command
input
willbe
executed
when
this is L.
(Active low input) 0.6 V
0.6V
3-bit
program
address
code
coming
from
controller
3-bit
program
address
code
coming
from
controller
Operating command
inputs.
Dutput
4 edaverted- output —-
Control command
outputs
Code input
Codc input
Code input
Program code
inputs
Operation command
inputs
Input of pause command
Input of play command
TB, MAX. 5.2 V, MIN. 4.75 V
Vee = Pin I6
6NO:Pin.6
© = Pin NUMBERS
@
Fig.
3-3,
Logic
diagram