參數(shù)資料
型號(hào)： XR68C681
廠商： Exar Corporation
英文描述： CMOS Dual Channel UART(CMOS 雙通道通用異步接收器/發(fā)送器)
中文描述： CMOS雙通道UART（的CMOS雙通道通用異步接收器/發(fā)送器）
文件頁數(shù)： 10/75頁
文件大?。?/td> 1383K
代理商： XR68C681
XR68C681
AC ELECTRICAL CHARACTERISTICS
1, 2, 3
(CONT’D)
Test Conditions: T
A
= 0 - 70 C, V
CC
= 5.0V +5% unless otherwise specified.
Symbol
Parameter
Min
Typ
Max
Unit
Conditions
Clock Timing (
Figure 38
)
5
5 $ 5 2! 9(-
: (
5 $ 5 2! C'&
/5
5
<
%
+
5
/
9G
9G
Transmitter Timing (
Figure 39
)
5
5 & 5 2!
:
5 & 5 #
:
16
%
6
%
Receiver Timing (
Figure 40
)
5
5 ( 5
2! 9(-
5 9$ ( + 5
2! 9(-
=
%
59
%
Notes
1.
Parameters are valid over the specified temperature and operating supply ranges. Typical values are 25 C, V
CC
= 5V and typical
processing parameters.
2.
All voltages are referenced to ground (GND). For testing, input signal levels are 0.4V and 2.4V with a transition time of 20ns
maximum. All time measurements are referenced at input voltages of 0.8V and 2.0V as appropriate. See Figure 31.
3.
AC test conditions for outputs: CL = 50pF, RL = 2.7k to V
CC
.
4.
Consecutive write operations to the same register require at least three edges of the X1 clock between writes.
5.
Thisspecificationimposesa6MHzmaximum68000clockfrequencyifareadorwritecyclefollowsimmediatelyaftertheprevious
read or write cycle. A higher 68000 clock can be used if this is not the case.
6.
This specification imposes a lower bound on CS and IACK low, guaranteeing that they will be low for at least one CLK period.
7.
This parameter is specified only to insure DTACK is asserted with respect to the rising edge of X1/CLK as shown in the timing dia-
gram, not to guarantee operation of the part. If the specified setup time is violated, DTACK may be asserted as shown or may be
asserted one clock cycle later.
8.
Theminimumhightimemustbeatleast1.5timestheX1/CLKperiodandtheminimumlowtimemustbeatleastequaltotheX1/CLK
period if either channel’s Receiver is operating in external 1X clock mode.
Specifications are subject to change without notice
ABSOLUTE MAXIMUM RATINGS
1
& ;-
-
;-% ( %' 0$
@;
/6
6
6; @;
1.
StressesabovethoselistedundertheAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice. Thisisastressrat-
ingonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsabovethoseindicatedinthe“ElectricalCharacteris-
tics” section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
2.
Thisproductincludescircuitryspecificallydesignedfortheprotectionofitsinternaldevicesfromdamagingeffectsofexcessivestat-
ic charge. Nonetheless,it issuggested thatconventional precautionsbe takento avoidapplying anyvoltage largerthan therated
maximum.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR68C681CJ 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS Dual Channel UART (DUART)
XR68C681CJ44 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC
XR68C681CJ-F 功能描述:UART 接口集成電路 0.5V-2V UART temp 0C to 70C RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR68C681CJ-F 制造商:Exar Corporation 功能描述:IC UART 2CH 68C681 PLCC44
XR68C681CJTR-F 功能描述:UART 接口集成電路 Dual Channel UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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