dp83840a National Semiconductor Corporation, dp83840a Datasheet - Page 73

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

Version A
8.0 Electrical Specifications
8.3 CLOCK TIMING
8.3.1 Clock Reference and Clock Generation Timing
Parameter
CLK25M
TX_CLK
T4a
T1
T2
T3
T4
T5
T6
OSCIN
REFIN
OSCIN to CLK25M Delay OSCIN = 50 MHz
CLK25M Rise Time
CLK25M Fall Time
OSCIN to TX_CLK Delay 10 Mb/s Operation (MII
OSCIN to TX_CLK Delay 10 Mb/s Operation (MII
REFIN to TX_CLK Delay 100 Mb/s Operation
TX_CLK Duty Cycle
T1
Description
T2
T5
10% to 90%
90% to 10%
Nibble Mode)
Serial Mode)
10 Mb/s Nibble (2.5 MHz),
10 Mb/s Serial (10 MHz)
100 Mb/s Nibble (25 MHz)
T6
Notes
73
T1
T3
Min
-3.0
35
0
Typ
30
10
10
5
5
T4
+3.0
Max
40
65
Units
ns
ns
ns
ns
ns
ns
%