DP83848C-POE-EK National Semiconductor, DP83848C-POE-EK Datasheet - Page 77
DP83848C-POE-EK
Manufacturer Part Number
DP83848C-POE-EK
Description
BOARD EVALUATION DP83848C
Manufacturer
National Semiconductor
Series
PowerWise®r
Specifications of DP83848C-POE-EK
Main Purpose
Special Purpose DC/DC, Power Over Ethernet
Outputs And Type
1, Isolated
Power - Output
24W
Voltage - Output
3.3V
Current - Output
7.3A
Voltage - Input
39 ~ 57V
Regulator Topology
Flyback
Frequency - Switching
250kHz
Board Type
Fully Populated
Utilized Ic / Part
LM5072
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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8.2.23 100BASE-TX Signal Detect Timing
Note: The signal amplitude on PMD Input Pair must be TP-PMD compliant.
8.2.24 100 Mb/s Internal Loopback Timing
Note1: Due to the nature of the descrambler function, all 100BASE-TX Loopback modes will cause an initial “dead-time”
of up to 550 s during which time no data will be present at the receive MII outputs. The 100BASE-TX timing specified is
based on device delays after the initial 550 s “dead-time”.
Note2: Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN.
T2.23.1
T2.23.2
T2.24.1
Parameter
Parameter
PMD Input Pair
SD+ internal
RXD[3:0]
TXD[3:0]
TX_CLK
RX_CLK
SD Internal Turn-on Time
SD Internal Turn-off Time
TX_EN to RX_DV Loopback
TX_EN
RX_DV
CRS
Description
Description
T2.23.1
T2.24.1
100 Mb/s internal loopback mode
77
Notes
Notes
T2.23.2
Min
Min
Typ
Typ
www.national.com
Max
Max
350
240
1
Units
Units
ms
ns
s
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