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XR88C681CP Datasheet, PDF (6/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)
XR88C681
44 PLCC/
LCC
1
40 DIP,
CDP
>
28 DIP,
CDIP
1
=
1


11
1

1<
16
1

1/
1
1
1>
11
<
Symbol
,<
5G.
99. 
,
5 ./
5 5
5 .5
,
 
5
7
5
5.9:
5
Type Description
 Output 4 (General Purpose Output).  (%  (
' %  - $  + '( %   $( "
'( " C ' (   $&D  C #  D ( $('
 +     5G. . 99. 
 Output 2 (General Purpose Output).  (%  (
' %  - $  + '( %  & +  +
( -4      %(  /5  5 ''3
 5 ./5  5 .5"     
 ' (  5 ''3  5 .5
 Output 0 (General Purpose Output).  (%  (
' %  - $  + '( %  '( "
 E % $  +     
 Transmitter Serial Data Output (Channel A). 
 % %(- (+('  ( +  ' '  (%  %( $ +(%
 (%  (% $ (  3( -  (-  %  
 %(  (% ($ " $(% $"   ( - (  9'
9,* : $  #+  !    %(  ''3 (%
% '(+( $" 5 "  $ (% % (+ $  +  
 %(   (+  -(%    +( -  $- +
 ''3
No Connect.
# Receive Serial Data Input (Channel A).   %
%(- (+('  ( +  ' '  (%  ' ( $ +(% #+ 
!    ' (  ''3" 5 " (% % '(+( $"  $ (%
% $   (%( - $- +  ''3
# Crystal Output of External Clock Input.  (% ( (%
 ' '( +  %($ +  '&%  $  ''(
  - $   (    %'( (% % $ #+ 
%'( (%  % $"  !   ''3 %(-  % 
%( $   (% ( 
# $  +  5==/= $ ('  + '(  &"
 %  % %&  %(-  ( + E '( %  
 8I  $ <8I  (%  E(   ' 
  & (   '&% %'(  &  !  
9'( ''3 %(- 
 Crystal Input.  '( +   %($ +  '&%
 %( + 5.9: #+  %'( (% % $" 
''( % %  ' ' $ +  (% ( 
- $  (% ( %   +  (+  !   ''3
(% %( $  5.9:
  
/