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FT245B 参数 Datasheet PDF下载

FT245B图片预览
型号: FT245B
PDF下载: 下载PDF文件 查看货源
内容描述: [上海格里电子科技有限公司是英国FTDI在中国大陆东南亚地区最大的代理商, FTDI一贯坚持USB make easy思想,为工程师提供最简便的解决方案 上海格里电子科技有限公司是英国FTDI在中国大陆东南亚地区最大的代理商, FTDI一贯坚持USB make easy思想,为工程师提供最简便的解决方案: *VNC2 实现UART、FIFO、IIC、SPI、JTAG转到USB HOST接口,可与其他USB DEVICE设备通讯。FTDI提供简单操作命令,工程师只需调用驱动中相应函数,便可实 现对USB device的控制。 *FT232实现单路USB转到UART,包括TTL,及RS485、RS422、RS232等接口。 *FT245实现单路USB转到FIFO,最高能实现8Mbit/s传输速率。 *FT2232H 实现单USB接口转到2通道芯片,每通道可分别配置成UART、FIFO、IIC、 SPI、JTAG等接口。当配置成2路并行FIFO时,每路最大速率达到10MByte/s;当配 置成单路串行FIFO时,可实现最高25MByte/s速率。 *FT42]
分类和应用: 先进先出芯片电子驱动电话
文件页数/大小: 24 页 / 541 K
品牌: FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
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FT245BL USB FIFO ( USB - Parallel ) I.C.  
7.0 Device Configuration Examples  
7.1 Oscillator Configurations  
Figure 4  
Figure 5  
3 Pin Ceramic Resonator Configuration  
Crystal or 2-Pin Ceramic Resonator  
Configuration  
FT245BL  
27pF  
FT245BL  
27  
27  
XTIN  
XTIN  
FT24  
3-Pin Resonator  
6MHz  
2 - Pin Resonator  
or Crystal  
1M  
6MHz  
27pF  
28  
28  
XTOUT  
XTOUT  
Figure 4 illustrates how to use the FT245BL with a 3-Pin Ceramic Resonator. A suitable part would be a ceramic  
resonator from Murata’s CERALOCK range. (Murata Part Number CSTCR6M00G15), or equivalent. 3-Pin ceramic  
resonators have the load capacitors built into the resonator so no external loading capacitors are required. This  
makes for an economical configuration. The accuracy of this Murata ceramic resonator is +/- 0.1% and it is specifically  
designed for USB full speed applications. A 1 MOhm loading resistor across XTIN and XTOUT is recommended in  
order to guarantee this level of accuracy.  
Other ceramic resonators with a lesser degree of accuracy ( typically +/- 0.5% ) are technically outwith the USB  
specification, but it has been calculated that using such a device will work satisfactorily in practice with a FT245BL  
design.  
Figure 5 illustrates how to use the FT245BL with a 6MHz Crystal or 2-Pin Ceramic Resonator. In this case, these  
devices do not have in-built loading capacitors so these have to be added between XTIN, XTOUT and GND as  
shown. A value of 27pF is shown as the capacitor in the example – this will be good for many crystals and some  
resonators but do select the value based on the manufacturers recommendations wherever possible. If using a crystal,  
use a parallel cut type. If using a resonator, see the previous note on frequency accuracy.  
DS245BL Version 1.7  
© Future Technology Devices Intl. Ltd. 2005  
Page 15 of 24  
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