dp83840a National Semiconductor Corporation, dp83840a Datasheet - Page 26

• Manufacturer Part Number: dp83840a
• Description: 10/100 Mb/s Ethernet Physical Layer
• Manufacturer: National Semiconductor Corporation

Version A
3.0 Functional Description
25 MHz SYSTEM
25 MHz SYSTEM
REFERENCE
REFERENCE
50ppm
50ppm
V
20 MHz
50ppm
CC
OSC
4.7 k
4.7 k
(Continued)
FIGURE 9. 25 MHz and 20 MHz References
FIGURE 10. Single 25 MHz Reference
CLK25M
CLK25M
TX_CLK
TX_CLK
OSCIN
OSCIN
REFIN
REFIN
X2
X1
X2
X1
26
SELECT
SELECT
SPEED
SPEED
MUX
MUX
DIV 2.0
DIV 2.0
National Semiconductor
DIV 2.5
20 MHz TO 10 Mb/s SECTION
25 MHz TO 100 Mb/s SECTION
25 MHz FROM 100 Mb/s SECTION
25 MHz TO 100 Mb/s SECTION
25 MHz FROM 100 Mb/s SECTION
2.5 MHz (OR 10 MHz) FROM 10 Mb/s SECTION
FROM 10 Mb/s SECTION
TO 10 Mb/s SECTION