XR68C681 Datasheet, PDF (9/75 Pages) Exar Corporation – CMOS Dual Channel UART (DUART)

XR68C681
AC ELECTRICAL CHARACTERISTICS ^{1, 2, 3}
Test Conditions: TA = 0 - 70
C, VCC = 5.0V +5% unless otherwise specified.
Symbol Parameter
Min
Typ
Max
Rest Timing (See Figure 32)
2
22 ,% A($

Read, Write and Interrupt Cycle Timing (Figure 33, Figure 34, Figure 35 )
 
 =  ( 
 :

 9
 = 9$ ( +
 9(-

A .A  ( 
 :

A9 .A  ( +
 9(-


A

 9(- ,% A($ ^{=" 6}




  #
7 9(- + 
7 :


 ;($ +
  #
7 :^/
@6

 *% ( - +
  #
7


9(-

  ( 
 :

9
 9$ ( +
 :
6
 :

7 : + $  ;($

 9

7 9(- +
  #
7 9(-

 

7 9(- #$ ' +
 
6
#
7 9(-




  #
7 %  (  H9(- I^@
<
Port Timing (Figure 36)
,
, #   ( 
 : 

.A 9(-
,9
, #  9$ ( +
 9(-

,
,  ;($ + .A"
 9(-
=
Interrupt Output Timing (Figure 37)
#
#8  ,1,@   %$ % # 
1
% 9(- +4
1

 + # % % *(% ( # 
#,


 + #  %3 ( #
Clock Timing (Figure 38)

:7
5.
:7 2!  9(-  : (


:7
5.
:7
&%  2!  C '&

1/<= @1@




 .( 2! 
'3 9(- 

: ( #,




 .( 2! 
'3

C '&
@1@
Unit
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
%
9G
%
9G
Conditions