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DP83867CS Datasheet(PDF) 107 Page - Texas Instruments

Part # DP83867CS
Description  DP83867E/IS/CS Robust, High Immunity, Small Form Factor 10/100/1000 Ethernet Physical Layer Transceiver
PDF  129 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

DP83867CS Datasheet(HTML) 107 Page - Texas Instruments

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8.2.1.2 Clock In (XI) Recommendation
If an external clock source is used, XO can be left floating. For a 1.8V clock source, XI can be tied to the clock
source. For a 3.3V or 2.5V clock source, a capacitor divider is recommended as shown in Figure 8-3. For a 3.3V
clock source, the CD1 and CD2 capacitors used are recommended to be 27pF. If a 2.5V clock source is used
check with the vendor for recommended capacitor loads. The values of CD1 and CD2 shall be adjusted to meet
XI Input pin specification defined in Section 6.5.
XI
XO
CD1
CD2
3.3V or 2.5V
Clock Source
Figure 8-3. Clock Divider
The CMOS 25MHz oscillator specifications are listed in Table 8-2. Additionally, the maximum oscillator phase
noise tolerated by the PHY is shown in Figure 8-4
Table 8-2. 25MHz Oscillator Specifications
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
Frequency
25
MHz
Frequency Tolerance
Operational Temperature
±50
ppm
Frequency Stability
1 year aging
±50
ppm
Rise / Fall Time
20% - 80%
5
ns
Symmetry
Duty Cycle
40%
60%
Jitter RMS
Integration Band: 12kHz to 5MHz
11
ps
Frequency Offset (Hz)
10
100
1000
10000
100000
1000000
-130
-125
-120
-115
-110
-105
-100
-95
-90
-85
D001
Figure 8-4. 25MHz Oscillator Phase Noise
8.2.1.3 Crystal Recommendations
A 25MHz, parallel, 18pF load crystal resonator can be used if a crystal source is desired. Figure 8-5 shows a
typical connection for a crystal resonator circuit. The load capacitor values vary with the crystal vendors; check
with the vendor for the recommended loads.
www.ti.com
DP83867CS, DP83867IS, DP83867E
SNLS504F – OCTOBER 2015 – REVISED JANUARY 2025
Copyright © 2025 Texas Instruments Incorporated
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Product Folder Links: DP83867CS DP83867IS DP83867E



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