參數(shù)資料
型號： TMDS461PZT
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁數(shù)： 24/43頁
文件大小： 3111K
代理商： TMDS461PZT
Layout Considerations
Using the TMDS461 in Systems with CEC Link Requirements
SLLS915 – JANUARY 2009 ............................................................................................................................................................................................... www.ti.com
Table 4. Pullup Resistor for Different Threshold Voltages and 800-pF Load
Vth–\Vth+
0.7 VDD
0.65 VDD
0.6 VDD
0.55 VDD
0.5 VDD
0.45 VDD
0.4 VDD
0.35 VDD
0.3 VDD
UNIT
0.1 VDD
1.14
1.32
1.54
1.80
2.13
2.54
3.08
3.84
4.97
k
0.15 VDD
1.20
1.41
1.66
1.97
2.36
2.87
3.59
4.66
6.44
k
0.2 VDD
1.27
1.51
1.80
2.17
2.66
3.34
4.35
6.02
9.36
k
0.25 VDD
1.36
1.64
1.99
2.45
3.08
4.03
5.60
8.74
18.12
k
0.3 VDD
1.48
1.80
2.23
2.83
3.72
5.18
8.11
16.87
—
k
Or, limiting the maximum load capacitance of each cable to 400 pF to accommodate with I2C spec version 2.1.
Ccable(max) = 400 pF/Csource = 50 pF/CI = 50 pF, the maximum values of R(max) are calculated as shown in Table 5.
Table 5. Pullup Resistor Upon Different Threshold Voltages and 500-pF Loads
Vth–\Vth+
0.7 VDD
0.65 VDD
0.6 VDD
0.55 VDD
0.5 VDD
0.45 VDD
0.4 VDD
0.35 VDD
0.3 VDD
UNIT
0.1 VDD
1.82
2.12
2.47
2.89
3.40
4.06
4.93
6.15
7.96
k
0.15 VDD
1.92
2.25
2.65
3.14
3.77
4.59
5.74
7.46
10.30
k
0.2 VDD
2.04
2.42
2.89
3.48
4.26
5.34
6.95
9.63
14.98
k
0.25 VDD
2.18
2.62
3.18
3.92
4.93
6.45
8.96
13.98
28.99
k
0.3 VDD
2.36
2.89
3.57
4.53
5.94
8.29
12.97
26.99
—
k
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 4, 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 high-speed differential TMDS inputs are the most critical paths for the TMDS461. 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 TMDS461.
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 TMDS461 supports a DTV with up to four HDMI inputs when used in conjunction with a signal-port HDMI
receiver. The CEC is an optional feature of the HDMI interface for centralizing and simplifying user control
instructions from multiple audio/video products in an interconnected system, even when all the audio/video
products are from different manufacturers. This feature minimizes the number of remote controls in a system, as
well as reducing the number of times buttons must be pressed.
In TMDS461, the HPD[x] of non-selected port follows the 5V_PWR[x] in normal operation. In Low Power mode (
LP mode) or if the TMDS461 is powered off, the HPD[x] will still follow 5V_PWR[x] from source, thus if it is
desired for the source to read the E-EDID memory in LP mode, a possible configuration in Figure 37 is
recommended.
30
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TMDS461
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