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參數(shù)資料
| 型號(hào)： | FT245BL-REEL |
| 廠商： | FTDI, Future Technology Devices International Ltd |
| 文件頁(yè)數(shù)： | 10/24頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC USB FS PARALLEL FIFO 32-LQFP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | * |
| 類型： | * |
| 應(yīng)用： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-LQFP |
| 供應(yīng)商設(shè)備封裝： | 32-LQFP（7x7） |
| 包裝： | 帶卷 (TR) |
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DS245BL Version 1.7
Future Technology Devices Intl. Ltd. 2005
Page 18 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Figure 8
USB Self Powered Conguration
Figure 8 illustrates a typical USB self powered conguration. A USB Self Powered device gets its power from its own
POWER SUPPLY and does not draw current from the USB bus. The basic rules for USB Self power devices are as
follows –
a) A Self-Powered device should not force current down the USB bus when the USB Host or Hub Controller is
powered down.
b) A Self Powered Device can take as much current as it likes during normal operation and USB suspend as it has its
own POWER SUPPLY.
c) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs
The USB power descriptor option in the EEPROM should be programmed to a value of zero (self powered).
To meet requirement a) the 1.5K pull-up resistor on USBDP is connected to RSTOUT# as per the bus-power circuit.
However, the USB Bus Power is used to control the RESET# Pin of the FT245BL device. When the USB Host or Hub
is powered up RSTOUT# will pull the 1.5K resistor on USB DP to 3.3V, thus identifying the device as a full speed
device to USB. When the USB Host or Hub power is off, RESET# will go low and the device will be held in reset. As
RESET# is low, RSTOUT# will also be low, so no current will be forced down USBDP via the 1.5K pull-up resistor
when the host or hub is powered down. Failure to do this may cause some USB host or hub controllers to power up
erratically.
Note : When the FT245BL is in reset, the FIFO interface pins all go tri-state. These pins have internal 200K pull-up
resistors to VCCIO so they will gently pull high unless driven by some external logic.
VCC
27R
USB "B"
Connector
27R
USB DM
RSTOUT#
8
FT245BM
USB DP
7
5
V
C
V
C
V
C
I
O
3
26
13
1
2
3
4
1k5
33nF
3v3OUT
6
470R
A
V
C
30
0.1uF
G
N
D
G
N
D
A
G
N
D
9
17
29
RESET#
4
10k
4k7
Decoupling Capacitors
10uF
VCC
0.1uF
+
FT245BL
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| FT245BQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FT245BQ USB FIFO ( USB - Parallel ) I.C. |
| 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 |
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