XR68C681J View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681J

CMOS Dual Channel UART(DUART)

Exar Corporation 

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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. :: " '(

 

=

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