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參數(shù)資料
| 型號(hào)： | FT245BQ |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | FT245BQ USB FIFO ( USB - Parallel ) I.C. |
| 中文描述： | FT245BQ USB先進(jìn)先出（USB端口-并行）集成電路 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 505K |
| 代理商： | FT245BQ |
DS245BL Version 1.6 Future Technology Devices Intl. Ltd. 2005
Page 15 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
7.0 Device Configuration Examples
7.1 Oscillator Configurations
Figure 4
3 Pin Ceramic Resonator Configuration
Figure 5
Crystal or 2-Pin Ceramic Resonator
Configuration
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.
XTIN
XTOUT
27
28
FT245BM
3-Pin Resonator
6MHz
1M
XTIN
XTOUT
27
28
FT245BM
2 - Pin Resonator
or Crystal
6MHz
27pF
27pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FT245BQ-REEL | 功能描述:USB 接口集成電路 USB to Parallel FIFO IC QFN-32 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| FT245R | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO I.C. Incorporating FTDIChip-ID⑩ Security Dongle |
| FT245R_10 | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface |
| FT245RL | 制造商:Future Technology Devices International 功能描述:USB FIFO IC 28-Pin SSOP 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC USB TO FIFO SMD SSOP28 245 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB TO FIFO, SMD, SSOP28, 245 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB FIFO INTERFACE, SSOP-28; USB Type:USB FIFO; USB Version:2.0; Supply Voltage Min:1.8V; Supply Voltage Max:5.25V; Digital IC Case Style:SSOP; No. of Pins:28; Data Rate:1Mbps; No. of Ports:2; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| FT245RL-2000 | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface |
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