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参数资料
| 型号： | TMDS261PAG |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 20/43页 |
| 文件大小： | 2160K |
| 代理商： | TMDS261PAG |
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HPD Pins
1kW
TMDS261
HPD_SINK
VCC/5V_source
1 k
(internal
W
series resistor)
VCC
HPD_SINK
HPD[1:2]
HPD_SOURCE
ON
L
H
L
ON
H
L
H
OFF
X
Z
H
VCC
HPD[1:2]
HPD_SOURCE
S0387-02
1kW
10kW
5V_Source (5VcomingfromHDMI source)
Layout Considerations
Using the TMDS261 in Systems with Different CEC Link Requirements
www.ti.com............................................................................................................................................................................................ SLLS953 – DECEMBER 2008
Obviously, to accommodate the 3-mA drive current specification, a narrower threshold voltage range is required
to support a maximum 800-pF load capacitance for a standard-mode I2C bus.
When the input low- and high-level threshold voltages, Vth– and Vth+, are 0.7 V and 1.9 V, respectively, which is
0.15 VDD and 0.4 VDD, approximately. With VDD = 5 V from Table 5, the maximum pullup resistor is 3.59 k. The
allowable pullup resistor is in the range of 1.83 k
and 3.59 k.
The HPD circuits are powered by the 3.3-V VCC supply. This provides maximum VOH = VCC and maximum VOL=
0.4-V output signals to the SOURCE with a typical 1-k
output resistance. An external 1-k resistor is not
needed here. The HPD output of the selected source port follows the logic level of the HPD_SINK input.
Unselected HPD outputs are kept low. When the device is in standby mode, all HPD outputs follow HPD_SINK.
If VOH greater than VCC is desired, then an external circuit as shown in Figure 33 can be used. In this case, the
max VOH can be equal to the 5 V coming from the HDMI source.
Figure 33. External Circuit to Drive 5-V VOH on HPD[1:2]
The high-speed differential TMDS inputs are the most critical paths for the TMDS261. There are several
considerations to minimize discontinuities on these transmission lines between the connectors and the device:
Maintain 100- differential transmission line impedance into and out of the TMDS261.
Keep an uninterrupted ground plane beneath the high-speed I/Os.
Keep the ground-path vias to the device as close as possible to allow the shortest return current path.
Keep the trace lengths of the TMDS signals between connector and device as short as possible.
The TMDS261 supports a DTV with up to two HDMI inputs when used in conjunction with a signal-port HDMI
receiver. Figure 34 and Figure 35 through Figure 37 show simplified application block diagrams for the TMDS261
Copyright 2008, Texas Instruments Incorporated
27
Product Folder Link(s) :TMDS261
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相关代理商/技术参数 |
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| TMDS261PAGR | 功能描述:视频开关 IC 2 to 1 HDMI Switch RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
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| TMDS2MTRPFCKIT | 功能描述:电源管理IC开发工具 Dual Motor Control and PFC Dev Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TMDS3080005 | 功能描述:EMULATOR CABLE RoHS:是 类别:编程器，开发系统 >> 配件 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 标准包装:1 系列:- 附件类型:USB 至 1-Wire? RJ11 适配器 适用于相关产品:1-Wire? 设备 产品目录页面:1429 (CN2011-ZH PDF) |
| TMDS3200026 | 制造商:Texas Instruments 功能描述:KIT-DSP STARTER PACK |
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