參數(shù)資料
型號(hào)： XR88C681CJTR-F
廠商： Exar Corporation
文件頁數(shù)： 60/101頁
文件大?。?/td> 0K
描述： IC UART CMOS DUAL 44PLCC
標(biāo)準(zhǔn)包裝： 500
特點(diǎn)： *
通道數(shù)： 2，DUART
FIFO's： 1 字節(jié)，3 字節(jié)
電源電壓： 4.75 V ~ 5.25 V
帶并行端口： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 44-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 44-PLCC（16.59x16.59）
包裝： 帶卷 (TR)
其它名稱： XR88C681CJTR-F-ND
XR88C681
61
Rev. 2.11
2. Externally connect the OP3 pin to the IP3 and IP4 pins.
Thereby applying a 1 MHz square wave into these two
input pins.
3. Write FF16 to CSRA.
This step will specify that the timing source for the
Transmitter and Receiver of Channel A will be derived
from input pins IP3 and IP4, respectively. Additionally,
this step allow the DUART hardware to presume that
these input signal are 1X signals. Hence, there is no
division-by-16 of this signal. Therefore, the bit rate of
Channel A is at 1 Mbps.
Please note that if the user were to apply this example,
he/she would be responsible for ensuring that the
incoming serial data stream is synchronous with the 1
MHz (1X) clock signal; in order to minimize bit errors.
D.7 Explanation of Clock Timing Signals
The purpose of this section is to explain the Data Sheet
specification on the Timing Control Block parameters. In
the past, this subject has been the source of considerable
confusion by numerous users.
The XR88C681 Data Sheet presents the following
parameter specifications in the
“AC ELECTRICAL CHARACTERISTICS”
Symbol
Parameter
Min.
Typ.
Max.
Units
tCLK
X1/CLK (External) High or Low Time
100
ns
fCLK
X1/CLK Crystal or External Frequency
2.0
3.6864
4.0
MHz
tCTC
Counter/Timer External Clock High or Low
Time - IP2 Input
100
ns
fCTC
Counter/Timer External Clock Frequency - IP2
Input
0
4.0
MHz
tRTX
RXC and TXC (External) High or Low Time -
via IP2, IP3, IP4 and IP5
220
ns
fRTX
RXC and TXC (External) Frequency - via IP2,
IP3, IP4, and IP5
fRTX - 16X
fRTX - 1X
16X
1X
0
2.0
1.0
MHz
Table 20. Clock Timing (Figure 13)
Now, here is an explanation for each of these parameters.
D
tCLK - X1/CLK (External) High or Low Time
The DUART employs dynamic logic throughout much of
its circuitry. Therefore, limits on tCLK and fCLK are
needed in order to ensure that the device will function
properly. This parameter just places a lower limit on the
amount of time at the signal applied through the X1/CLK
pin must reside at the high and low states.
D
fCLK - X1/CLK Crystal High or Low Time
This parameter specifies the range of frequencies
permissible at the X1/CLK input, via either crystal
oscillator or applied TTL input signal. Therefore, the use
can only apply between 2.0 and 4.0 MHz at this input.
D
tCTC - Counter/Timer External Clock High or Low
Time - IP2 Input
This parameter places a lower limit on the amount of time
that the signal, being applied to the IP2 pin, for use by the
Counter/Timer, can reside at the high and low states.
Please note that this limit has no relationship with the
parameter tRTX, which is another spec associated with
the IP2 input.
D
fCTC - Counter/Timer External Clock Frequency -
IP2 Input
This parameter places an upper limit of the input
frequency being applied to the IP2 pin, for use by the
Counter/Timer. The spec basically states that a signal
with frequency up to 4.0 MHz can be applied at the IP2
pin, and still be properly handled by the Counter/Timer.
相關(guān)PDF資料
PDF描述
ST16C2550IQ48TR-F IC UART FIFO 16B DUAL 48TQFP
XR16C2550IMTR-F IC UART FIFO 16B DUAL 48TQFP
ST78C34CP40-F IC UART FIFO 83B 40PDIP
XR16M2551IL32TR-F IC UART FIFO 16B DUAL 32QFN
XR16L2551ILTR-F IC UART FIFO 16B DUAL 32QFN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR88C681CN/40 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS DUAL CHANNEL UART (DUART)
XR88C681CP/28 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS DUAL CHANNEL UART (DUART)
XR88C681CP/28-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
XR88C681CP/40 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
XR88C681CP/40-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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*