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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.  
Figure 10  
Self Powered Circuit with 3.3 V logic drive / supply voltage  
VCC3V  
VCC5V  
470R  
USB "B"  
Connector  
1
2
3
4
27R  
27R  
0.1uF  
3
26  
13  
30  
V
C
C
V
C
C
V
C
C
I
A
V
C
C
6
O
3v3OUT  
33nF  
FT245BL  
4K7  
8
7
USB DM  
USB DP  
VCC3V  
10K  
1K5  
11  
5
4
SI/WU  
RSTOUT#  
RESET#  
VCC5V  
A
G
N
D
G
N
D
G
N
D
+
9
17  
29  
0.1uF  
0.1uF  
10uF  
Decoupling Capacitors  
Figure 10 is an example of a USB self powered design with 3.3V interface. In this case VCCIO is supplied by an  
external 3.3V supply in order to make the device IO pins drive out at 3.3V logic level, thus allowing it to be connected  
to a 3.3V MCU or other external logic. A USB self powered design uses its own power supplies, and does not draw  
any of its power from the USB bus. In such cases, no special care need be taken to meet the USB suspend current  
(0.5 mA) as the device does not get its power from the USB port.  
As with bus powered 3.3V interface designs, in some cases, where only a small amount of current is required (<5mA),  
it may be possible to use the in-built regulator of the FT245BL to supply the 3.3V without any other components being  
required. In this case, connect VCCIO to the 3v3OUT pin of the FT245BL.  
Note that if SI/WU is not being used it should be pulled up to VCCIO.  
DS245BL Version 1.7  
© Future Technology Devices Intl. Ltd. 2005  
Page 20 of 24  
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