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TMDS181I bảng dữ liệu(PDF) 45 Page - Texas Instruments

tên linh kiện TMDS181I
Giải thích chi tiết về linh kiện  TMDS181x 6 Gbps TMDS Retimer
PDF  58 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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TMDS181I bảng dữ liệu(HTML) 45 Page - Texas Instruments

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± W
R C
D D
9 W
9
 ± H

K
C C
u p (m in )
s in k
V
R
I

BUS
MASTER
TMDS181
TMDS181
TMDS181
BUS
SLAVE
Rup Rup
Rup
Rup
3.3 V
5 V
5 V
3.3 V
RUPsource
RUPsink
RUPsource
C1
C2
C1
C2
C2
5 V
C2
5 V
RUPsink
C3
C3
SOURCE
Active Cable
SINK
TSCL
TSDA
SDA_SRC
SLK_SRC SLK_SINK
SDA_SINK
SLK_SRC
SDA_SRC SDA_SINK
SLK_SINK
SLK_SRC
SDA_SRC SDA_SINK
SLK_SINK
RSLK
RSDA
TMDS181, TMDS181I
www.ti.com
SLASE75A – AUGUST 2015 – REVISED OCTOBER 2015
9.2.3 Application Chain Showing DDC Connections
The DDC circuitry inside the TMDS181 allows multiple stage operation (see Figure 36). The retimer devices can
be connected to any of the bus segments. The number of devices that can be connected in series is limited by
repeater delay/time of flight considerations for the maximum bus speed requirements.
Figure 37. Typical Series Application
9.2.3.1 Detailed Design Procedure
9.2.3.1.1
DDC Pullup Resistors
NOTE
This section is informational only and subject to change depending upon the specific
system implementation.
The pullup resistor value is determined by two requirements.
1. The maximum sink current of the I2C buffer: The maximum sink current is 3 mA or slightly higher for an I2C
driver supporting standard-mode I2C operation.
(1)
2. The maximum transition time on the bus: The maximum transition time, T, of an I2C bus is set by an RC time
constant. The parameter, k, can be calculated from Equation 3 by solving for t, the times at which certain
voltage thresholds are reached. Different input threshold combinations introduce different values of t.
Table 10 summarizes the possible values of k under different threshold combinations.
T = k × RC
where
•
R is the pullup resistor value.
•
C is the total load capacitance.
(2)
(3)
Copyright © 2015, Texas Instruments Incorporated
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Product Folder Links: TMDS181 TMDS181I



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