REV. 1.3.2 5V PCI BUS QUAD UART 21 2.0 CRYSTAL OSCILLATOR / BUFFER The 154 includes an on-chip oscillator (XTAL1 and XTAL2). The cr" />
參數(shù)資料
型號： XR17C154CV-0A-EVB
廠商： Exar Corporation
文件頁數(shù)： 14/62頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR17C154-A 144TQF
標準包裝： 1
系列： *
xr
XR17C154
REV. 1.3.2
5V PCI BUS QUAD UART
21
2.0 CRYSTAL OSCILLATOR / BUFFER
The 154 includes an on-chip oscillator (XTAL1 and XTAL2). The crystal oscillator provides the system clock to
the Baud Rate Generators (BRG) in each of the 4 UARTs, the 16-bit general purpose timer/counter and inter-
nal logics. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the output.
See Programmable Baud Rate Generator in the UART section for programming details.
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant with
10-22 pF capacitance load, 100ppm) connected externally between the XTAL1 and XTAL2 pins (see Figure 7).
Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal 4 baud rate generators
for standard or custom rates. However, for external clock frequencies greater than 24MHz, a 2K pull-up may be
necessary on the XTAL2 output (see Figure 8). Typical oscillator connections are shown in Figure 7. For fur-
ther reading on oscillator circuit please see application note DAN108 on EXAR’s web site.
FIGURE 7. TYPICAL OSCILLATOR CONNECTIONS
FIGURE 8. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE
C1
22-47pF
C2
22-47pF
14.7456
MHz
XTAL1
XTAL2
R=300K to 400K
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
相關(guān)PDF資料
PDF描述
XR16V798IQ-0B-EVB EVAL BOARD FOR XR16V798-B 100QFP
XR16V798IQ-0A-EVB EVAL BOARD FOR XR16V798-A 100QFP
XR16V698IQ-0B-EVB EVAL BOARD FOR XR16V698-B 100QFP
XR16V698IQ-0A-EVB EVAL BOARD FOR XR16V698-A 100QFP
KIT33972AEWEVBE KIT EVALUATION FOR MC33972
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR17C154CV-F 功能描述:UART 接口集成電路 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
XR17C154CVTR-F 制造商:Exar Corporation 功能描述:UART 4-CH 64Byte FIFO 5V 144-Pin LQFP T/R 制造商:Exar Corporation 功能描述:XR17C154CVTR-F
XR17C154IV 功能描述:UART 接口集成電路 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
XR17C154IV-F 功能描述:UART 接口集成電路 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
XR17C154IVTR-F 制造商:Exar Corporation 功能描述:UART 4-CH 64Byte FIFO 5V 144-Pin LQFP T/R 制造商:Exar Corporation 功能描述:XR17C154IVTR-F
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*