XR88C681P(1999) Просмотр технического описания (PDF) - Exar Corporation

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Компоненты Описание

производитель

XR88C681P
(Rev.:1999)

CMOS Dual Channel UART (DUART)

Exar Corporation 

XR88C681

AC ELECTRICAL CHARACTERISTICS 1, 2, 3

Test Conditions:  J   >

" ;

J 6;
6K %%  (% %'(+($

Symbol

Parameter

Min.

Reset Timing (See Figure 51)

2

22 ,% B($



XR88C681 Read and Write Cycle Timing (Figure 52)4



1  (  " B



9

8

1 8$ ( + " B



9




  (  " B 9




8

 8$ ( + " B



8(-

B

" B ,% B($

6



 ;($ +  9



 *% (- +  8(-





  (  B 8(-



8

 8$ ( + B 8(-

6

B

8(- ( * $%

$. B(%6" /

Z-Mode Interrupt Cycle Timing (Figure 53)

#

#2 & ( + #2#

#

#
:  (   9>

#8

#
: 8$ ( +  8(-

2#

#2#  (   9

2

#2 & ( + #7 9

Port Timing (Figure 54)4

,

, #  ( 



.
 9

,8

, # 8$ ( +



.
 8(-

,

,  ;($ + B.


8(-

Interrupt Output Timing (Figure 55)

#

#7  ,1  ,>   %$

% #% 8(- +4
 +

#% % *(% ( # 

#,

 + # %3 (

#

Clock Timing (Figure 56)


9:

5.
9: 2! 8(-  9



(


9:

5.
9:
&%  2!

E'&

Typ.

/





6

Max.

>6







<

1

1

>1>

Unit Conditions

•

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

8I

 



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