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參數資料
| 型號： | TMDS251PAGR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 多路復用及模擬開關 |
| 英文描述： | 3-CHANNEL, AUDIO/VIDEO SWITCH, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數： | 9/28頁 |
| 文件大小： | 751K |
| 代理商： | TMDS251PAGR |
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HPD Pins
DDC Channels
RupSource
VDDSource
Source
Sink
Ron
SCL_SINK
SDA_SINK
SCL
SDA
Driver(Source)
I to-Sink
I to-Source
VDDSink
RupSink
VCCRx
RupRx
Driver(Sink)
Ito
* Sink +
V
dd * Vol(Sink)max
R
upSource RupSink
(1)
lto
* Sink +
V
dd
R
upSource RupSink
(2)
V
ith(Source)min u lto * Sink
Ron ) Vol(Sink)max
(3)
R
upSink w
V
dd
Ron
R
upSource
(V
ith(Source)min * Vol(Sink)max)
R
upSource * Vdd
Ron
(4)
R
upRx w
V
ccRx
Ron
(V
ith(Sink)min * Vol(Source)max)
(5)
SLLS852 – AUGUST 2007
The HPD circuits are powered by the 5-V supply. They provide 5-V TTL 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. A 1-k
resistor to ground keeps all HPD outputs
low in standby mode if a fixed low state is preferred.
The DDC circuits (SDA, SCL) are powered by a 5-V supply. The I/O pins can connect to the 5-V termination
voltages directly. A 47-k
pull-up resistor to the 5 V is recommended on the SCL1 and SCL2 pins. There is no
pull-up resistor on the SDA pins. The pull-up resistor can be replaced with a different value.
Figure 17. Simplified Electrical Circuit Model for DDC Channel
In Figure 17, when the Driver (Sink) pulls the bus low, the highest voltage level is Vol(Sink)max. The current flow
through the pass-gate resistor can be presented as:
where the Vddsource = Vddsink = Vdd
To simplify the equation, Vol(Sink)max is set equal to 0 V to reach equation (2):
The voltage at the input of the SINK is Ito - Sink
× Ron + V
ol(Sink)max, which should be lower than the minimum
input low threshold voltage of the Driver (Source), Vith(Source)min to keep the bus in correct interoperations.
By combining equations (2) and (3), the minimum pull-up resistor at the Sink input is:
Applying the same methodology to calculate the pull-up resistor at the input of the Driver (Sink), the minimum
pull-up resistor is:
The data sheet VPASS specification ensures the maximum output voltage is clamped at 3.6 V to support a 3.3-V
connection. Resistors pulling up to 3.3 V on SCL_SINK and SDA_SINK ensure the high level does not exceed
the 3.3-V termination voltage.
Copyright 2007, Texas Instruments Incorporated
17
Product Folder Link(s): TMDS251
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| TMDS251PAGRG4 | 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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| TMDS261BPAG | 功能描述:多路器開關 IC 2 to 1 HDMI switch RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| TMDS261BPAGR | 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 |
| 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 |
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