Tektronix 2235A Instruction Manual page 56

Theory of Operatlon
-
2235A lnstructlon
Table 3-2
PAL Logic Implementation
Use the following equations with the input values from Table 3-1 to determine the value of the PAL outputs for
different switch settings.
2235A U555 Pin Asslgnment
PAL OUTPUT DEFINING EQUATION
F1
=
CH 1 TR
=
A m
+
A m
+
BG
+
AEFG
+
A E F ~
+
BE
+
EF
F2
=
CH 2TR
=
BFGQ
+
BEQ
+
B E
+
BEFE
+
A
F4
= =
EF
-
F 5 = -
=
CD
F7
=
XY
-
BEF
F8
=
INT
=
BD
+
AD
+
BC
+
AC
-
F9 =
EXT
=
ABD
+
m C
-
F10
=
LINE
=
CDF
+
CDE
+
BCD
Not used
GND
PIN NUMBER
19
18
17
16
15
14
13
12
Outputs
1 20
Scans
by ARTEK MEDLQ
=>
vcc