Tektronix 7704A User Manual

L OGIC FUN DA MEN TA LS
Digital logic tec h ni q u es are used to perform ma ny
functions wit h in t h is instrument . T he function and
o p eration of t h e logic circuits are descri b ed using logic
symbology and terminology . T h is p ortion of t he manual is
pr ovi ded to ai d in t h e un d erstan d ing of t h ese symbols an d
terms . T h e following i n formation is α b asic introduction to
logic conce p ts, not α compreh ensive discussion of t he
sub j
ect
.
F
or furt
h er i n formation
on b inary
n u mber
systems
an d t h e associate d Boolean Algebra co ncep ts, t he d erivation
of logic fun ctions,
α
more detailed
analysis of
digital logic,
etc ., refer
to
t h e followi ng textb oo k s :
Ro b ert C . Baron an
d Al b ert Τ . P iccirilli, "Digital Logic
a nd Computer
O p eration", M cGraw- H ill, N ew Yor k ,
1967 .
T h omasC . Bartee, "Digital Computer Fu nd amentals",
M cGraw- H ill, N ew Yor k , 1966
.
Yao
h
an
C h u, "Digital Com p uter Design F undamentals",
M cG r aw- H ill, N ew Yor k , 1962 .
J oseph M illman and H er b ert Tau b , "
Pu
lse,
Digital,
and
Switc h ing
Waveforms", M cGraw- H ill, N ew Yor k ,
C h a p
ters 9-11, 1965 .
Symbols
T h e op e r ation of circ
u
its in t h is
instr u ment w h ic h use
d igital tec h ni qu es is descri be d
u
si
n g
t
he
grap
h ic symb ols set
fort h in military stan d ar d MIL-STD-806B . Ta
b le 2-1
p rovides α b asic logic
reference
fo
r t he logic d evices used
wit
h
i
n
t
h
is
i n strument . Any d eviatio n s from t he stan d ar d
sym bology, or
devices not defined by t he stan d ar d are
descri bed in t
he
circ
u
it d
escription for t h e ap p licable
device .
A ND gate
REV . Β , ΜΑΥ ,
1976
ΝΟΤΕ
L ogic symbols usedon the d iagrams depict
the logic
function as used in t his instrument and
may d iffer
from the manufacturer's data
.
Device Ι
Sym b ol
TA BLE 2-1
B asic L ogic R efe r ence
L ogic P olarity
T he Hl-LO logic notation can be conveniently
converted to 1-0 notation by d isregarding the first
letter of each step . Thus :
In p
ut/Out p ut Tables
Non-Digital Devices
Desc
r i p tio n
Circuit Description -7704A Service
All
logic functio n s are d escri b
ed
using the p
ositive logic
convention . P ositive logic is α system of notation w h e r e t h e
more positive of two levels (H 1) is called t h e tr ue or 1-state ;
t
he more negative
level
( L
O) is calle d t h
e
false o r 0-state .
T he
HI-LO
met h
o
d
of
n otation is use d in
t
h
is
logic
d escription . T h e s p ecific voltages w h ic h con stitute α HI or
L O state vary b etween in d ivi d u al d evices .
ΝΟΤΕ
Η / = 1
LO =0
Wh erever possi b le, t he in put and output lines are name d
to i ndicate t h e f u nction t
h
at t
h ey p erform w h en
at t
he
HI
(true) state .
F
or exam
p le,
t
he line
la
b ele
d "
V - Η In h i b it"
means t h at t
h
e
vertical
an
d h orizontal deflection function is
in h i b ited or
disa b le d w h en t h is li n e is HI .
I np
ut/out pu t (tr
u
t
h )
ta b
les
are u se d i n con j u n ction with
t h e logic d iagrams to s h ow t h e input com b i n ations
im portant to α particular fu n ctio n , alon g wit h t h e resultant
output con d itions . T h is ta b le may be given eit h er for an
in d ivi d ual d evice or for α complete logic stage .
F
or
exam p les of i n p ut/output tables for in d ivi d ual d evices, see
Ta b le 2-1 .
Not all of t he i n tegrate d circuit d evices i n t h is instr u ment
are digital logic devices . T he f unction of non-digital d evices
is descri b
e
d i nd
ivi
d ually, using op erating waveforms or
ot
h er tech ni q ues
to
illustrate
t
h eir f
u nction .
Α d evice with two or mo r e in p uts
a nd one output . T he output of t he
A ND gate is HI if a nd only if all of
t he i npu ts are at t h e Η Ι state .
In pu t/O u tput Tab le
I npu t /Out pu t
2- 3
Α Β Χ
L O L O L O
L O ΗΙ L O
HI L O L O
HI HI HI

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English