XR68C681 Datasheet, PDF (5/75 Pages) Exar Corporation – CMOS Dual Channel UART (DUART)

XR68C681
PIN DESCRIPTION (CONT’D)
Pin Number
(44 pin PLCC)
@
<




1
=
6
/
@
<

1
1
1
Pin Number
(40 pin DIP)
6
/
@
<




1
=
6
/
@
<

Symbol
Type Description
,@
5ED 

1
6
@
08
8

#8
/
=


,/
5ED 
,=
5E.
::D 
,
5
D5
5
D/5
,
 
 Output 7. -  %   (%  ( ' %
 ' +(-$      $( '(  '  
5E 
#. Three State Data Bus.
#. Three State Data Bus.
#. Three State Data Bus.
#. MSB of Eight Bit Three State Data Bus.   %+% 
  
,  $   3 '    $ % ' 
%(%% + ( %   @   % (%  %$    

(  (% (- " !' $( -  #
7 '&'
Ground. + '
No Connect.
 Interrupt Request. '( :"  (  #8 (% %%$
   '' ' +     +   ' (.% %3
( ( - ' $(( %  (% %(-  ( ( %%$
 -    (  %(' (   $ (  -$
 '   ' $(( % '%( -   (  C% % 
(( $
#. Three State Data Bus.
#. Three State Data Bus.
#. Three State Data Bus.
#. LSB of the Eight Bit Three State Data Bus.   %+%
  
,  $ )  3 '   (% %  
% (%  %$    
 (  (% (- " !' $( - 
#
7 '&'
 Output 6. -  %   (%  ( ' %
 ' +(-$    '("  $( '  
5E  5ED 
 Output 4. -  %   (%  ( ' %
 ' +(-$     $( '   5E. ::
 '(
 Output 2. -  %   (%  ( ' %
 ' +(-$   (  5  /5 ''3  +   '  
  %(
 Output 0. -  %   (%  ( ' %
 ' +(-$     '(
  C% $
  
 
6