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FT245BQ PDF预览

FT245BQ

更新时间: 2024-10-28 03:37:59
品牌 Logo 应用领域
飞特帝亚 - FTDI 先进先出芯片
页数 文件大小 规格书
24页 557K
描述
USB FIFO ( USB - Parallel ) I.C.

FT245BQ 数据手册

 浏览型号FT245BQ的Datasheet PDF文件第1页浏览型号FT245BQ的Datasheet PDF文件第2页浏览型号FT245BQ的Datasheet PDF文件第3页浏览型号FT245BQ的Datasheet PDF文件第5页浏览型号FT245BQ的Datasheet PDF文件第6页浏览型号FT245BQ的Datasheet PDF文件第7页 
FT245BQ USB FIFO ( USB - Parallel ) I.C.  
Multiple Device Support without EEPROM  
When no EEPROM (or a blank or invalid  
or totally changed simply by changing the FPGA  
configuration data file. Application notes, software  
and development modules for this application area  
will be available from FTDI and other 3rd party  
developers.  
EEPROM) is attached to the device, the FT245BQ  
no longer gives a serial number as part of its  
USB descriptor. This allows multiple devices to  
be simultaneously connected to the same PC.  
However, we still highly recommend that EEPROM  
is used, as without serial numbers a device can  
only be identified by which hub port in the USB tree  
it is connected to which can change if the end user  
re-plugs the device into a different USB port.  
Less External Support Components  
As well as eliminating the RCCLK RC network, and  
for most applications the need for an external reset  
circuit, we have also eliminated the requirement  
for a 100K pull-up on EECS to select 6MHz  
operation. When the FT245BQ is being used  
without the configuration EEPROM, EECS, EESK  
and EEDATA can now be left n/c. For circuits  
requiring a long reset time (where the device is  
reset externally using a reset generator I.C., or  
reset is controlled by the IO port of a MCU, FPGA  
or ASIC device) an external transistor circuit is  
no longer required as the 1.5K pull-up resistor on  
USBDP can be wired to the RSTOUT# pin instead  
of to 3.3V. Note : RSTOUT# drives out at 3.3V  
level, not at 5V VCC level. This is the preferred  
configuration for new designs.  
EEREQ# / EEGNT#  
These (FT8U245AM) pins are no longer supported  
on the FT245BQ device. They have been replaced  
with the new SI / WU and PWREN# signals  
respectively.  
Extended EEPROM Support  
The previous generation of devices only supported  
EEPROM of type 93C46 (64 x 16 bit). The new  
devices will also work with EEPROM type 93C56  
(128 x 16 bit) and 93C66 (256 x 16 bit). The extra  
space is not used by the device, however it is  
available for use by other external MCU / logic  
whilst the FT245BQ is being held in reset.  
USB 2.0 ( full speed option )  
A new EEPROM based option allows the FT245BQ  
to return a USB 2.0 device descriptor as opposed  
to USB 1.1. Note : The device would be a USB 2.0  
Full Speed device (12Mb/s) as opposed to a USB  
2.0 High Speed device (480Mb/s).  
DS245BQ Version 1.7  
© Future Technology Devices Intl. Ltd. 2005  
Page 4 of 24  

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