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參數資料
| 型號： | TMDS261BPAGR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數： | 26/49頁 |
| 文件大小： | 11321K |
| 代理商： | TMDS261BPAGR |
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HPD Pins
1 kW
TMDS261B
HPD_SINK
VCC/5V_source
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
S0387-07
1 kW
10 kW
5V_Source (5V coming from HDMI source)
1 k
(internal
series resistor)
W
Layout Considerations
Using the TMDS261B in Systems with Different CEC Link Requirements
SLLS987 – SEPTEMBER 2009 .......................................................................................................................................................................................... www.ti.com
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, then 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 45 can be used. In this case, the
maximum VOH can be equal to the 5 V coming from the HDMI source.
Figure 45. External Circuit to Drive 5-V VOH on HPD[1:2]
The high-speed differential TMDS inputs are the most critical paths for the TMDS261B. 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 TMDS261B.
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.
Keep intra-pair skew (trace length) between the positive and negative TMDS inputs matched to within 5 mils
(0.005 inches or 0.127 mm).
The TMDS261B supports a DTV with up to two HDMI inputs when used in conjunction with a signal-port HDMI
receiver. Figure 46 and Figure 47 through Figure 49 show simplified application block diagrams for the
32
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TMDS261B
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相關代理商/技術參數 |
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| TMDS261PAG | 功能描述:視頻開關 IC 2 to 1 HDMI Switch RoHS:否 制造商:Texas Instruments 開關數量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| TMDS261PAGR | 功能描述:視頻開關 IC 2 to 1 HDMI Switch RoHS:否 制造商:Texas Instruments 開關數量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
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