參數(shù)資料
型號： XR17D152
廠商： Exar Corporation
英文描述： UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
中文描述： 通用（3.3V和5V）PCI總線的雙UART
文件頁數(shù)： 22/68頁
文件大小： 772K
代理商： XR17D152
XR17D152
UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
á
REV. 1.2.0
22
3.0
CRYSTAL OSCILLATOR / BUFFER
The D152 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 2 UARTs, the 16-bit general purpose timer/counter and
internal 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 9
).
Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal 2 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 10
). Typically, the oscillator connections are shown in
Figure 9
. For
further reading on oscillator circuit please see application note DAN108 on EXAR’s web site.
F
IGURE
9. T
YPICAL
OSCILLATOR
CONNECTIONS
F
IGURE
10. E
XTERNAL
C
LOCK
C
ONNECTION
FOR
E
XTENDED
D
ATA
R
ATE
C1
22-47pF
C2
22-47pF
14.7456
MHz
XTAL1
XTAL2
R=300K to 400K
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR17D152CM 制造商:EXAR 制造商全稱:EXAR 功能描述:UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
XR17D152CM-0A-EVB 功能描述:界面開發(fā)工具 Supports D152 100 ld TQFP, PCI Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
XR17D152CM-F 功能描述:UART 接口集成電路 3.3V-5V 64B FIFO temp 0C to 70C; 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
XR17D152CMTR-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
XR17D152IM 制造商:EXAR 制造商全稱:EXAR 功能描述:UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
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