参数资料
型号: XR17C154IV
厂商: Exar Corporation
文件页数: 14/62页
文件大小: 0K
描述: IC UART PCI BUS QUAD 144LQFP
产品变化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
标准包装: 60
特点: *
通道数: 4,QUART
FIFO's: 64 字节
规程: RS485
电源电压: 5V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
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
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