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XR68C681J-F Datasheet, PDF (6/75 Pages) Exar Corporation – CMOS Dual Channel UART(DUART) | |||
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XR68C681
PIN DESCRIPTION (CONTâD)
Pin Number
(44 pin PLCC)
Pin Number
(40 pin DIP)
11
1
1=
16
1
1/
1
1@
11
1<
1=
1
16
=
1/
=
1@
Symbol
Type Description
5
8
5
5.:7
5
22
#,
.D25
5*
#
7
Transmitter Serial Data Output.
% %(-
(+
('
( (%
%($ +(% (% (% $ (
3(
-
(- %
%( (% ($" $(%$" (
-
(
' :,*
7 $ #+ !
''3 (% %'(+($"
%($ $ (% % (+$ +
%( (+
-(%
+(
- $- + ''3
No Connect.
# Receiver Serial Data Input.
% %(-
(+('
( (% '($ +(% #+
!
'( ''3 (% %'(+($"
'($ $ (% %$
(%(
- $- + ''3
#
Crystal Output or External Clock Input. (% (
(% '
'(
+
%($ + '&%
$ ''( -
$
(
%'( (% %$ #+ %'( (%
%$"
!
''3 %(-
% %($ (% (
#
$ + 5/</< $(' +
'(
&" %
% %& %(-
( +C
'(%
9G
$
= 9G (% C(
'
& ( '&% %'(
& !
:'( ''3 %(-
# Crystal Input.
'(
+
%($ + '&% %(
+ 5.:7 #+ %'( (% %$" ''( % %
'
'$ + (% (
-
$ (% (
% +
(+
!
''3 (% %($ 5.:7
# Master Reset.
(% (
'% (
-(%%
"
*" #" #" ," ," (
(((G% #; /" %%
.(" '% (
%" , ,@ (
-(' H (- I %"
$ '% %( '
% (
(
'( % ( 5
$ 5* 3(
- (-
# Chip Select.
'( $ % (% %$
(% (-
%+%
,
$
(
@
$
(%
# Input 2. 0
% (
(% (
'
% '
+(-
$ . !
''3 (
" '
* '(
'3 #
5*
# Interrupt Acknowledge.
'( : (% (
(% ,.%
%
% (
C% (%%$ &
$('
A
, %%% (% (
" ( (
$('%
.%
(
C% (% %('$"
$ &
!
% '&' (
(
'3
$- '&'
( %
$ ,.% (
'3
$- & '(
-
'
% + #
;' -(% #;
$ %
@
/
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