參數(shù)資料
型號: XR17C154
廠商: Exar Corporation
英文描述: Tip, Offset Tapered Needle, 1mm Diameter
中文描述: 四5V的PCI總線的UART
文件頁數(shù): 20/62頁
文件大小: 721K
代理商: XR17C154
XR17C154
5V PCI BUS QUAD UART
á
REV. 1.3.0
20
2.0
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.
CRYSTAL OSCILLATOR / BUFFER
F
IGURE
7. T
YPICAL
OSCILLATOR
CONNECTIONS
F
IGURE
8. 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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參數(shù)描述
XR17C154_05 制造商:EXAR 制造商全稱:EXAR 功能描述:5V PCI BUS QUAD UART
XR17C154CV 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
XR17C154CV-0A-EVB 功能描述:UART 接口集成電路 Supports C154 144 ld TQFP, PCI Interface 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
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