XR68C681 Datasheet, PDF (4/75 Pages) Exar Corporation – CMOS Dual Channel UART (DUART)

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

<





1

=

6
1
/
=
Symbol
Type Description
#,

 
.A

7
5*
8

5*
,
*
,1
5
*
5
*

.DE
,6
5E.
::D*
# Input Port 0. 0  % (   (% (  ' % 
' +(-$     '( '  
 $ # 

 
# Read/Write Input. #+  (% (  (% (-  (
 (% "    

, (% +( -  2  '&' (     #+  (% ( 
(% "  (
 (% "    
, (% +( -  A#2
'&' (    
 Data Transfer Acknowledge.   " '( 4  
  %%% 
7 ( $  ( +  
,    
%  2   A#2 ( (% & '  
/< +(& +
,% C(%  (% %(-  + (% ( 
$('%" ( $  C('3&  $ & '  2  
A#2 '&'
#+     %%% 
7 $( -  2  ( " ( ( $(
'%   
,     C%$ $ (%    $ %
#+ 
7 (% %%$ $( -  #  '3 $- '&'"
    (% ( +( -  
,     '  % +   #;
#  ;' -(%  (    $ %
#+     %%%   
7 $( -  A#2 '&'" ( (%
( +( -  
,     $"    $ %" % 
' $ (    $ % ++ +     $('
# Receiver Serial Data Input- Channel B.   % %(- (+(' 
( +   ' ' (% '($ +(% #+  !  '(
''3 (% %'(+($"   '($ $ (% %$    (%( -
$- +  (% ''3
No Connect.
 Transmitter Serial Data Output - Channel B.   % %(- (+
('  ( +   '   (%  %($ +(%  (%  (% $ (
  3( -  (-  %      %( (% ($" $(%$"
 ( - (   ' :,*
7 $ #+  !  ''3
(% %'(+($"    %($ $ (% % (+$  +   
 %(  (+ -(%    +( - $- +  (% ''3
 Output 1. -  %   (%  ' % 
' +(-$ %   '( '   * C% $ 
*
 Output 3. -  %   (%  ( ' %
 ' +(-$     '   *  %( 5
'3 
5
*"   '   * '( 5
'3  5
*"  %
 '("  $(
 .( $& 

.DE
 Output 5. -  %   (%  ( ' %
 ' +(-$      $( " '( '   *
5E. :: " '(
 
=