XR82C684CJ View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR82C684CJ

CMOS Quad Channel UART (QUART)

Exar Corporation 

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XR82C684

D.7 Explanation of Clock Timing Signals

   % *  (% %'( (%  "(   !  

%'(*('(   ((,
  ) '6 % $

  %#  (% %C' %    % ' * ' %(

' *%( &  % %%

  80
.0@ !   %%   *  3(,

 %'(*('( %# (   /
5<5
$
<

;
5$$
1

Symbol


<=

*
<=




*


8

*8

*8  .8

*8  8

Parameter

8-
<= 5" ;(,  < 3 (

8-
<=
&%  5" I'&

-( 5"
 '6 ;(,  < 3 ( 

$+ $

-( 5"
 '6 I'&  $+

$

8
 8
5" ;(,  < 3 (  (

$+# $+4# $+@  $+9

8
 8
5" I'&  ( $+#

$+4# $+@#  $+9

.8

8

Min.















Limits

Typ.

4.0.@

Max.

B4B0

B4B0

Units

%

;J

%

;J

%

.



;J

;J

Figure 37. Clock Timing

: 3 *   "( *  ' *  % %7

 tCLK - X1/CLK (External) High or Low Time

    &% &('  ,('   ,  ' *

(% '('(&  * # (( ((% 
<=  *
<=

  (   %     (' 3( *'(

 &  (%  C% '%   3 ((  

  * (    %(, (   ,   8-
<=

( % %(    (,   3 %%

 fCLK - X1/CLK Crystal High or Low Time

 (%  %'(*(%   , * *I'(%

(%%(    8-
<= (# ( (  '&%

%'(   ( < ( %(,  * #   %

' & & 3   B4B0 ;J   (% (

 tCTC - Counter/Timer External Clock High or

Low Time - IP2/IP10 Input

 (%  '%   3 ((     * (

    %(,# (, (    $+  $+ (%# * 

% &  
-(%# ' %(    (,   3

%% Please note that this limit has no relationship with

the parameter tRTX, which is another spec associated

with the IP2 input.

fCTC - Counter/Timer External Clock Frequency -

IP2/IP10 Input

 (%  '%   (( *   (

*I'& (, (    $+  $+ (%# *  %

&  
-(%   %' %('& %%   

%(, 3( *I'&   B4B0 ;J '  ( 

  $+  $+ (%#  %(   &  &  

-(%

 tRTX - RXC and TXC (External) High or Low Time

- via IP3 - IP6, and IP11 - IP14

 (% %' '%   3 ((     * (   

%(,# (, (    2 + % $ +(%#

$+  $+9  $+  $+@# *  % %   %( 

'(
 '6 % '# ' %(    (,   3 %

 fRTX - RXC and TXC (External) Frequency - via

IP3 - IP6, and IP11 - IP14

 (% %' '% ((%     8  .8 "

%(,%      %  ' '6   %(% 

'(% $*   % 3(% %  %  8 ' '6# -% 

' & &  %(, 3( *I'(%    ;J

 (% ( 3( %% (  (  *  % % 5"

 $*   % 3(% %  %  .8 ' '6# -%  ' &

&  %(, 3( *I'(%   . ;J ('  (%

%(, (%  .8 %(,#  (% 3( % (  (  * %

 

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