DP83907VF National Semiconductor, DP83907VF Datasheet - Page 19

• Manufacturer Part Number: DP83907VF
• Description: IC CONTROLLR AT/LANII TP 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83907VF

• Controller Type: Network Interface Controller (NIC)
• Interface: Twisted Pair
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 150mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-MQFP, 160-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83907VF

4 0 Functional Description
On-Chip Filters
The on-chip filters are enabled via an external pull-up resis-
tors on MSD
former and impedance matching resistors are needed for
the transmit and receive twisted pair interface
UTP STP Function
The TPI transceiver supports both shielded and unshielded
twisted pair cable UTP is default but STP can be enabled
during configuration by a pull-up on MSA
bit D6 of configuration register C In UTP mode TXO
TXOD
ED In STP mode TXO
TXO
Auto-Switch Function
When an auto-switch function is enabled at configuration by
a pull-up on MSA
tion register C it allows the transceiver to switch between
TP and AUI outputs If there is an absence of link pulses
the transceiver will switch to AUI mode Similarly when the
transceiver starts detecting link pulses it will switch to TP
mode The switching from one mode to the next is only
done after the current package has been transmitted or re-
ceived If the twisted pair output is jabbering and gets into
link fail state then the switch to AUI mode is only done after
the jabbering is done including the time it takes to unjab
(unjab time) When auto-switching is enabled the THIN out-
put is automatically generated if AUI is selected
a
a
and TXOD
are driven and TXO
k
12
l
k
a
FIGURE 16b Circuitry to Connect DP83907 to Twisted Pair Cable with Internal Filter
5
at configuration Only an isolation trans-
l
are TRI-STATED
or by setting bit D4 of the configura-
b
b
and TXOD
and TXOD
b
k
b
7
are driven and
l
(Continued)
are TRI-STAT-
or by setting
a
and
19
Status Information
Status information is provided by the DP83907 on the
ACT led COL led and GDLNK led outputs as de-
scribed in the pin description table These outputs are suit-
able for driving status LED’s as shown in Figure 17 All out-
puts are open drain
Recommended Transformers for Internal Filter mode
1) Valor PT4160
2) Pulse PE-68029
3) PCA EPE6087A
4) Delta THX16B02
5) Belfus A553-3899-06
6) Kappa TP3036
FIGURE 17 Typical DP83907 LED Connection
TL F 12082 – 52
TL F 12082 – 12