參數(shù)資料
型號(hào)： FT245BL
廠商： Future Technology Devices International Ltd
元件分類(lèi)： 微控制器/微處理器
中文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PQFP32
封裝： 7 X 7 MM, 0.80 MM PITCH, LEAD FREE, LQFP-32
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 995K
代理商： FT245BL
DS245B Version 1.7
Future Technology Devices Intl. Ltd. 2005
Page 15 of 24
FT245BM USB FIFO ( USB - Parallel ) I.C.
7.0 Device Conguration Examples
7.1 Oscillator Congurations
Figure 4
3 Pin Ceramic Resonator Conguration
Figure 5
Crystal or 2-Pin Ceramic Resonator
Conguration
Figure 4 illustrates how to use the FT245BM 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 conguration. The accuracy of this Murata ceramic resonator is +/- 0.1% and it is specically
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
specication, but it has been calculated that using such a device will work satisfactorily in practice with a FT245BM
design.
Figure 5 illustrates how to use the FT245BM 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
OBSOLETE
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FT245BL/TR 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC USB FIFO SMD LQFP32 245 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB FIFO, SMD, LQFP32, 245 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB FIFO INTERFACE, 480MBPS, LQFP-32; USB Type:FIFO; USB Version:1.1, 2.0; Supply Voltage Min:4.35V; Supply Voltage Max:5.25V; Digital IC Case Style:LQFP; No. of Pins:32; Data Rate:480Mbps; No. of Ports:2; MSL:MSL 3 - 168 hours ;RoHS Compliant: Yes
FT245BL-REEL 功能描述:USB 接口集成電路 USB to Parallel FIFO IC LQFP-32 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)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
FT245BL-TRAY 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB FIFO ( USB - PARALLEL ) I.C.
FT245BM 功能描述:先進(jìn)先出 Obsolete See FT245RL RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類(lèi)型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪問(wèn)時(shí)間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝:
FT245BM-TRAY 功能描述:USB 接口集成電路 Obsolete See FT245RL RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)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
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