Dld Soft Copy

8/18/2019 Dld Soft Copy

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DIGITAL LOGIC DESIGN PROJECT

TOPIC:EVENT COUNTER

WHAT IS A EVENT COUNTER?

• Found on many data acu!"!t!on d#$!c#"%

#$#nt count#& count" t'# no o( t!m#" a d!)!ta*

"!)na* c'an)#" "tat#+ T'# #$#nt count#&

count" t'# t&an"!t!on" o( t'# c*oc, "ou&c# and

t'# )at!n) m#c'an!"m !" "!m-*y an #na.*#

"/!tc' t#**!n) !t #!t'#& to count t'# "!)na* o&

!)no t'# "!)na*+

• INTRODUCTION TO EVENT COUNTER:

• In d!)!ta* *o)!c and com-ut!n)% a counter !" a

d#$!c# /'!c' "to" 0and "om#t!m#"

d!"-*ay"1 t'# num.#& o( t!m#" a-a&t!cu*a& #$#nt o& -&oc#"" 'a" occu&d%

o(t#n !n *at!on"'!- to a c*oc, "!)na*+ T'#

mo"t common ty-# !" a "#u#nt!a* d!)!ta*

*o)!c c!&cu!t /!t' an !n-ut *!n# ca**#d t'#

2c*oc,2 and mu*t!-*# out-ut *!n#"+ T'# $a*u#"

on t'# out-ut *!n#" -"#nt a num.#& !nt'# .!na&y o& 3CD num.#& "y"t#m+ Eac'

-u*"# a--*!#d to t'# c*oc,

!n-ut !ncm#nt" o& d#cm#nt" t'# num.#&

!n t'# count#&+

• A count#& c!&cu!t !" u"ua**y con"t&uct#d o( a

num.#& o( 4!-54o-" conn#ct#d !n ca"cad#+


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Count#&" a a $#&y /!d#*y5u"#d com-on#nt

!n d!)!ta* c!&cu!t"% and a manu(actud a"

"#-a&at# !nt#)&at#d c!&cu!t" and a*"o

!nco&-o&at#d a" -a&t" o( *a&)#& !nt#)&at#d

c!&cu!t"+

• T'# #$#nt count#& count" t'# t&an"!t!on" o(

t'# c*oc, "ou&c# + U-on !n!t!a*!6at!on %t'#

count !" "#t to 6#&o count" and !ncm#nt"

-*u" on# on #ac' c*oc, t&an"!t!on+

• Som# #$#nt count#&" a**o/ - "#tt!n) $a*u#"

/!t' countdo/n (unct!on" + L!,# t'# !nt#&na*

c*oc, %t'!" (#atu !" d#$!c# d#-#nd#nt+

• CO7PONENTS RE8UIRED FOR THE PROJECT:

•

IC 999• IC ;1

• RESISTORS OF VALUES5 =,o'm % ;,o'm %

=;o'm%= ,o'm

• CAPACITOR ;+;@ 7ICROFARAD

• DIODE IN;;=

• SWITCH

• T'# IC ;


3/12

!t" a c*oc, o& -u*"# count#& IC /'!c'

"-ond" to -o"!t!$# -u*"#" at !t" c*oc, !n-ut

and d#cod#" !t "#&!a**y to -&oduc# a d!ct*y

ada.*# d!"-*ay o( t'# count num.#&

t'&ou)' t'# conn#ct#d = "#)m#nt d!"-*ay

modu*#

• PIN CONFIGURATION OF IC ;


4/12

t'# -o"!t!$# "u--*y o& t'# Vdd+ Con$#&"#*y !n

o&d#& to a**o/ no&ma* (unct!on!n) o( t'# IC

t'!" -!nout "'ou*d .# )&ound#d+

Pin 3,4: T'#"# a t'# R!--*# .*an,!n) IN

and R!--*# .*an,!n) OUT -!nout" o( t'# IC%

/'!c' -&o$!d#" t'# u"#& /!t' t'# o-t!on o(

#!t'#& a**o/!n) t'# non5"!)n!Bcant 6#&o" to .#

d!"-*ay#d o& to .# *#(t out (&om t'#

conn#ct#d d!)!ta* d!"-*ay"+

Pin 14: It" t'# *am- t#"t -!nout o( t'# IC+

A" t'# nam# "!)n!B#" !t !" u"#d (o& t#"t!n) t'#

conn#ct#d d!)!ta* d!"-*ay" !n t#&m" o(

!**um!nat!on *#$#*+ W'#n t'!" -!nout !"

conn#ct#d to a '!)' *#$#* o& t'# -o"!t!$#"u--*y% t'# no&ma* (unct!on o( t'# IC !"

d!"a.*#d and a** t'# d!)!t" o( t'# =

"#)m#nt d!"-*ay a a--*!#d /!t' a '!)' "tat#

"o t'at t'# d!)!t" a a**o/#d to )#t

!**um!nat#d to)#t'#&+ T'!" a**o/" u" to t#"t

t'# !nt#n"!ty *#$#*" o( t'# d!)!t" and !( any o(t'# d!"-*ay d!)!t" a not (unct!on!n)

o-t!ma**y o& a d!m du# to "om#

ma*(unct!on+

Pin 6,7,9,10,11,12,13: A** t'#"# -!nout" a

t'# out-ut" o( t'# IC /'!c' a conB)ud

/!t' t'# d!"cu""#d = "#)m#nt d!)!ta* d!"-*ay


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modu*#+

Pin 15: It" t'# "#t !n-ut o( t'# IC% a '!)'

*o)!c o& a--*y!n) t'# "u--*y $o*ta)# to t'!"

-!n "#t" IC com-*#t#*y% "u*t!n) !n c*#a&!n)

a** t'# data (&om t'# d!"-*ay and "to&!n) !t

to 6#&o+

Pin 5: It" t'# ca&&yout -!n out o( t'# IC% !t

"#nd" a '!)' *o)!c out-ut a(t#& #$#&y @; *#)!t

c*oc," at t'# c*oc, -!n@ o( t'# IC+ T'u" -!n9 !"u"#d a" a c*oc, out-ut o& a ca&&y (o&/a&d

#t#n"!on (o& t'# n#t co&"-ond!n) IC ;


6/12

• S#$#n5"#)m#nt d!"-*ay" a /!d#*y u"#d

!n d!)!ta* c*oc,"% #*#ct&on!c m#t#&"% .a"!c

ca*cu*ato&"% and ot'#& #*#ct&on!c d#$!c#" t'at

d!"-*ay num#&!ca* !n(o&mat!on+

• A !e"en !e$%ent &i!'()* !" t'# mo"t .a"!c

#*#ct&on!c d!"-*ay d#$!c# t'at can d!"-*ay

d!)!t" (&om ;5+ T'#y Bnd /!d# a--*!cat!on !n

d#$!c#" t'at d!"-*ay num#&!c !n(o&mat!on *!,#

d!)!ta* c*oc,"% &ad!o% m!c&o/a$# o$#n"%

#*#ct&on!c m#t#&" #tc+ + T'# mo"t common

conB)u&at!on 'a" an a&&ay o( #!)'t LED"

a&&an)#d !n a "-#c!a* -att#&n to d!"-*ay t'#"#

d!)!t"+ T'#y a *a!d out a" a "uad5o

B)u + E$#&y LED !" a""!)n#d a nam# (&om

KaK to K'K and !" !d#nt!B#d .y !t" nam#+ S#$#n

LED" KaK to K)K a u"#d to d!"-*ay t'#

num#&a*" /'!*# #!)'t' LED K'K !" u"#d to

d!"-*ay t'# dotd#c!ma*+

• A "#$#n "#)m#nt !" )#n#&a**y a$a!*a.*# !n t#n

-!n -ac,a)#+ W'!*# #!)'t -!n" co&"-ond to

t'# #!)'t LED"% t'# ma!n!n) t/o -!n" 0at

m!dd*#1 a common and !nt#&na**y "'o&t#d+

T'#"# "#)m#nt" com# !n t/o conB)u&at!on"%

nam#*y% Common cat'od# 0CC1 and Common

anod# 0CA1+ In CC conB)u&at!on% t'# n#)at!$#

t#&m!na*" o( a** LED" a conn#ct#d to t'#

common -!n"+ T'# common !" conn#ct#d to

)&ound and a -a&t!cu*a& LED )*o/" /'#n !t"

https://en.wikipedia.org/wiki/Digital_clockhttp://www.engineersgarage.com/content/ledhttps://en.wikipedia.org/wiki/Digital_clockhttp://www.engineersgarage.com/content/led


7/12

co&"-ond!n) -!n !" )!$#n '!)'+ In CA

a&&an)#m#nt% t'# common -!n !" )!$#n a '!)'

*o)!c and t'# LED -!n" a )!$#n *o/ to

d!"-*ay a num.#&+

• IC 999

• 999 t!m#& !" &o.u"t% "ta.*# and mo"t

common*y u"#d IC !n t'# aa o( #*#ct&on!c"

and a*"o u"# !n many #*#ct&on!c c!&cu!t"+ IC

999 !" a "ua /a$# )#n#&ato& and !t" dutycyc*# &an)# (&om 9; to @;;+ T'# t!m#

d#*ay !n t'# c!&cu!t !" -&o$!d#d .y an

o"c!**ato&+ 999 t!m#& IC )ot !t" nam# (&om

t'# t'# 9 ,!*o5o'm "!"to& attac'#d a" a

-att#&n o( $o*ta)# d!$!d#& a" "'o/n !n t'#

.#*o/ B)u+


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• PIN DISCRIPTION OF IC 999

•

• Tri$$er In'ut: I( t'# !n-ut M@


9/12

So (o& mo"t o( t'# t!m# !t !" attac'#d to t'#

"u--*y $o*ta)# a" !n t'# B)u+

•

Contro( In'ut: An #t#&na* $o*ta)# a--*!#dto t'!" t#&m!na* c'an)#" t'# t'"'o*d a" /#**

a" t&!))#& $o*ta)#+ T'u" .y !m-o"!n) a

$o*ta)# on t'!" -!n o& .y conn#ct!n) a -ot

.#t/##n t'!" -!n and )&ound% t'# -u*"# /!dt'

o( t'# out-ut /a$# can .# $a&!#d+ /'#n not

u"#d% t'# cont&o* -!n "'ou*d .# .y-a""#d to

)&ound /!t' a ;+;@uF ca-ac!to& to -$#nt

any no!"# -&o.*#m+

• Di!c)r$e Pin: W'#n t'# t!m#& out-ut !" *o/

t'!" -!n !" conn#ct#d to ; $o*t"+ It !" u"#d to

d!"c'a&)# t'# t!m!n) ca-ac!to& !n a"ta.*# and

mono"ta.*# mod#+• -roun&: T'# (#nc# -o!nt o& )&ound -o!nt

o( IC999 !" conn#ct#d to t'# )&ound t#&m!na*

o( t'# dc $o*ta)# "ou&c#% Vo*ta)#" o( t'#

#nt! c!&cu!t a m#a"ud /!t' "-#ct to

t'!" t#&m!na*+

• Out'ut: T'# out-ut o( t!m#& and t'# *oad !"

conn#ct#d to t'!" -!n+

• +u''(*: T'!" $o*ta)# mu"t .# a -u &!--*#

(# DC $o*ta)# /'!c' !" o.ta!n#d .y

conn#ct!n) a -o"!t!$# )u*at#d -o/#& "u--*y+

• .OR/IN- O TE PROECT:


10/12

EVENT count#& u"#" IC 999 /'!c' !" t!m#& IC+

T'!" IC !" u"#d to )#n#&at# c*oc, -*u"#+ T'!" IC !"

u"# to t&!))#& cd ;


11/12

• W'#n t'# ca-ac!to& $o*ta)# /!** .#com#"

"*!)'t*y )at#& t'an < Vcc t'# out-ut o( t'#

'!)'#& com-a&ato& /!** .# HIGH and o( *o/#&

com-a&ato& /!** .# LOW+ T'!" "#t" t'# SR

F*!-54o-+ T'u" t'# d!"c'a&)!n) t&an"!"to&

tu&n" ON and t'# ca-ac!to& "ta&t" d!"c'a&)!n)

t'&ou)' "!"to& R.+

• Soon t'# ca-ac!to& $o*ta)# /!** .# *#"" t'an

< Vcc and out-ut o( .ot' com-a&ato&" /!**

.# LOW+ So t'# out-ut o( t'# SR F*!-54o- /!**

.# t'# -$!ou" "tat#+ So t'# d!"c'a&)!n) o(

ca-ac!to& cont!nuou"+

• W'#n t'# ca-ac!to& $o*ta)# /!** .#com# *#""

t'an @< Vcc% t'# out-ut SET" "!nc# t'#

out-ut o( *o/#& com-a&ato& !" HIGH and o('!)'#& com-a&ato& !" LOW and t'# ca-ac!to&

"ta&t" c'a&)!n) a)a!n+T'!" -&oc#"" cont!nuou"

and a ctan)u*a& /a$# /!** .# o.ta!n#d at

out-ut +


12/12

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