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參數(shù)資料
| 型號(hào)： | TUSB2077 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 7-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE |
| 中文描述： | 7 -端口通用串行總線(xiàn)與可選的串行EEPROM接口集線(xiàn)器 |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 242K |
| 代理商： | TUSB2077 |
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TUSB2077A
7-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROMINTERFACE
SLLS414 – MARCH 2000
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
A major advantage of USB is the ability to connect 127 functions configured in up to six logical layers (tiers) to
a single personal computer (see Figure 5)
PC
With Root Hub
Monitor
With 4-Port Hub (Self-Powered)
Keyboard
With 4-Port Hub
(Bus-Powered)
Printer
With 4-Port Hub
(Self-Powered)
Modem
Telephone
Mouse
Left
Speaker
Right
Speaker
Digital
Scanner
Scanner
Figure 5. USB Tiered Configuration Example
Another advantage of USB is that all peripherals are connected using a standardized four wire cable that
provides both communication and power distribution. The power configurations are bus-powered and
self-powered modes. The maximum current that may be drawn from the USB 5-V line during power up is 100
mA. For the bus-powered mode, a hub can draw a maximum of 500 mA from the 5-V line of the USB cable. A
bus-powered hub must always be connected downstream to a self-powered hub unless it is the only hub
connected to the PC and there are no high-powered functions connected downstream. In the self-powered
mode, the hub is connected to an external power supply and can supply up to 500 mA to each downstream port.
High-powered functions may draw a maximum of 500 mA from each downstream port and may only be
connected downstream to self-powered hubs. Per the USB specification, in the bus-powered mode, each
downstream port can provide a maximum of 100 mA of current, and in the self-powered mode, each
downstream port can provide a maximum of 500 mA of current.
Both bus-powered and self-powered hubs require over-current protection for all downstream ports. The two
types of protection are individual port management (individual port basis) or ganged port management (multiple
port basis). Individual port management requires power management devices for each individual downstream
port, but adds robustness to the USB system because, in the event of an over-current condition, the USB host
only powers down the port that has the condition. The ganged configuration uses fewer power management
devices and thus has lower system costs, but in the event of an over-current condition on any of the downstream
ports, all the ganged ports are disabled by the USB host.
Using a combination of the BUSPWR and EEDATA/GANGED inputs, the TUSB2077A supports four modes of
power management: bus-powered hub with either individual port power management or ganged port power
management, and the self-powered hub with either individual port power management or ganged port power
management. Texas Instruments supplies the complete hub solution because we offer this TUSB2077A, the
TUSB2046 (4-port) and the TUSB2140B (4-port with I
2
C) hubs along with the power management chips needed
to implement a fully USB Specification 1.1 compliant system.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TUSB2077A | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:7-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE |
| TUSB2077APT | 功能描述:USB 接口集成電路 7-Port Hub W/Opt Ser EEPROM Ifc 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 |
| TUSB2077APT | 制造商:Texas Instruments 功能描述:HUB UNI SERIAL BUS 7 PORT 48LQFP 制造商:Texas Instruments 功能描述:HUB, UNI SERIAL BUS, 7 PORT, 48LQFP 制造商:Texas Instruments 功能描述:HUB, UNI SERIAL BUS, 7 PORT, 48LQFP; USB Type:USB Transceiver; USB Version:1.1; Supply Voltage Min:3V; Supply Voltage Max:3.6V; Digital IC Case Style:LQFP; No. of Pins:48; Data Rate:12Mbps; No. of Ports:7; Operating Temperature ;RoHS Compliant: Yes |
| TUSB2077APTG4 | 功能描述:USB 接口集成電路 7-Port USB Hub 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 |
| TUSB2077APTR | 功能描述:USB 接口集成電路 7-Port Hub W/Opt Ser EEPROM Ifc 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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