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參數(shù)資料
| 型號： | 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 -端口通用串行總線與可選的串行EEPROM接口集線器 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 242K |
| 代理商： | TUSB2077 |
TUSB2077A
7-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROMINTERFACE
SLLS414 – MARCH 2000
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description
The TUSB2077A hub is a 3.3-V CMOS device that provides up to seven down stream ports in compliance with
the USB version 1.1 specification. Because this device is implemented with a digital state machine instead of
a microcontroller, no software programming is required. Fully compliant USB transceivers are integrated into
the ASIC for all upstream and downstream ports. The downstream ports support both full-speed and low-speed
devices by automatically setting the slew rate according to the speed of the device attached to the ports. The
configuration of the BUSPWR terminal selects either the bus-powered or the self-powered mode. The
introduction of the DP0 pull-up resistor disable pin, DP0PUR, makes it much easier to implement an on-board
bus/self-power dynamic-switching circuitry. The three LED indicator control output pins also enable the
implementation of visualized status monitoring of the hub and its downstream ports. With these new function
pins, the end equipment vendor can considerably reduce the total board cost while adding additional product
value.
The EXTMEM (Pin 47) enables or disables the optional EEPROM interface. When EXTMEM is high, the vendor
and product IDs (VID and PID) use defaults, such that the message displayed during enumeration is General
Purpose USB Hub For this configuration, pin 8 functions as the GANGED input pin and the EECLK (Pin 7) is
unused. If custom VID and PID descriptors are desired, the EXTMEM must be tied low (EXTMEM = 0) and a
SGS Thompson M93C46 or equivalent EEPROM must be used to store the programmable VID, PID and
GANGED value. For this configuration, pin 7 and pin 8 function as the EEPROM interface signals with pin 7 as
EECLK and pin 8 as EEDATA respectively.
The TUSB2077A supports both bus-powered and self-powered modes. External power management devices
such as the TPS2044 are required to control the 5 V-power source switching (on/off) to the downstream ports
and detect over-current condition from the downstream ports individually or ganged. Outputs from external
power devices provide over-current inputs to the TUSB2077A OVRCUR pins in case of an over-current
condition, the corresponding PWRON pins will be disabled by the TUSB2077A. In the ganged mode, all
PWRON signals transitions simultaneously, and any OVRCUR input can be used. In the nonganged mode, the
PWROR outputs and OVRCUR inputs operate on a per port basis.
The TUSB2077A provides the flexibility of using either a 6-MHz or a 48-MHz clock. The logic level of the MODE
terminal controls the selection of the clock source. When MODE is low, the output of the internal APLL circuitry
is selected to drive the internal core of the chip. When MODE is high, the XTAL1 input is selected as the input
clock source and the APLL circuitry is powered down and bypassed. The internal oscillator cell is also powered
down while MODE is high. For 6-MHz operation, TUSB2077A requires a 6-MHz clock signal on XTAL1 pin (with
XTAL2 for a crystal) from which its internal APLL circuitry generates a 48 MHz internal clock to sample the data
from the upstream port. For 48-MHz operation, the clock cannot be generated with a crystal, using the XTAL2
output, since the internal oscillator cell only supports fundamental frequency. If low power suspend and resume
are desired, a passive crystal or resonator must be used, although the hub supports the flexibility of using any
device that generates a 6-MHz clock. Because most oscillators cannot be stopped while power is on, their use
prohibits low-power suspend, which depends on disabling the clock. When the oscillator is used, by connecting
its output to XTAL1 terminal and leaving XTAL2 terminal open, its TTL output level can not exceed 3.6 V. If a
6 MHz oscillator is used, it must be stopped at logic low whenever SUSPND is high. For crystal or resonator
implementations, the XTAL1 terminal is the input and the XTAL2 terminal is used as the feedback path. A sample
crystal tuning circuit is shown in Figure 7.
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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: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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