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参数资料
| 型号： | DS2490S |
| 英文描述： | USB to 1-Wire Bridge Chip |
| 中文描述： | USB与1 - Wire桥接芯片 |
| 文件页数： | 33/50页 |
| 文件大小： | 530K |
| 代理商： | DS2490S |
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DS2490
33 of 50
033199
identify the DS2490 as a high speed USB device to the up-stream HUB. The 33 pF capacitors are
optional but are useful for edge rate control and for bypassing high frequency energy to ground for EMI
reduction purposes.
USB Transceiver Termination
Figure 11
USB
TRANSCEIVER
24
, 1%
24
, 1%
DS2490
D+
D-
1.5k
5%
VB
(VB = 3.3V + 10%)
TO/FROM
HIGH SPEED
USB CABLE
33pF
33pF
SUSPEND OUTPUT
Suspend output signal (
SUSO
) operation is a function of both the USB device state of the DS2490
(configured or unconfigured) and the USB suspend state. A truth table for signal operation is listed in
Table 18. This signal could be used stand-alone or combined with other external signals to power down
circuitry external to the DS2490, such as power sources. The
SUSO
signal is an open drain output and
requires an external pullup to a positive supply no greater than 6.0V.
Suspend Output Operation
Table 18
Device State
Suspend State
unconfigured
don’t care
configured
not suspended
configured
suspended
SUSO
high
low
high
OSCILLATOR
The DS2490 requires a single 12.0 MHz crystal or crystal oscillator clock source to operate. Crystals or
CMOS crystal oscillators may be used to provide clock sources. For crystals, use parallel resonant,
fundamental mode with a CL specification between 10 pF and 20 pF at the required frequency. Parallel
loading capacitors with a value of approximately twice CL are also required. The connection scheme
shown in Figure 12 should be used. For external CMOS crystal oscillators, make a connection directly to
the DS2490 XI input. The XO output must be left floating for this arrangement.
Oscillator Connection
Figure 12
DS2490
XI
XO
33 pF
33 pF
12 MhZ
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| DS2502-E64 | IEEE EUI-64 Node Address Chip |
| DS26334 | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2490S+ | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Rail/Tube 制造商:Maxim Integrated Products 功能描述:USB 1-W BRIDGE CHIP 24-SO LF 制造商:Maxim Integrated Products 功能描述:Bulk |
| DS2490S+T&R | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Tape and Reel |
| DS2490S+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:USB to 1-Wire Bridge Chip |
| DS2490X | 制造商:未知厂家 制造商全称:未知厂家 功能描述:USB to 1-Wire Bridge Chip(468.41 k) |
| DS2490X/T&R | 功能描述:接口 - 专用 RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
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