FT245B 参数 Datasheet PDF下载

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。 *FT4232H实现单USB接口转4通道芯片，每通道可分别配置成UART、IIC、SPI、 JTAG。主要应用在SOC、CPU进行多串口扩展，典型产品为车载多媒体娱乐设备和各类自主终端。与同类功能芯片相比，FTDI产品最大优势在于其高品质与高稳定性，主要表现在低坏片率（小于万分之一）、超长时间通讯不中断、不重启，以及驱动的稳定性和驱动的兼容性。FTDI提供免费驱动，经过微软官方认证，支持window98至最新的windows7所有windows系列操作系统，并支持MAC OS、windows mobile、Linux等平台，对于其他平台的驱动，FTDI可提供底层代码以便工程师开发使用。联系人: 何贵平（Gary）联系电话: 021-64414999 64389812-809 手机：13661631714 电子邮件: gary@gelitek.com 公司名称: 上海格里电子科技有限公司公司网站：www.gelitek.com 地址：上海市徐汇区蒲汇塘路11号1505-1506室]
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. ]

FT245BL USB FIFO ( USB - Parallel ) I.C.

The FPGA based hardware can be easily upgraded

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 3

party

developers.

•

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 FT245BL 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.

•

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 FT245BL is being held in reset.

•

USB 2.0 ( full speed option )

A new EEPROM based option allows the FT245BL

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).

•

EEREQ# / EEGNT#

These (FT8U245AM) pins are no longer supported

on the FT245BL device. They have been replaced

with the new SI / WU and PWREN# signals

respectively.

•

Multiple Device Support without EEPROM

When no EEPROM (or a blank or invalid

EEPROM) is attached to the device, the FT245BL

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.

DS245BL Version 1.7

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