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DP83850C Datasheet(PDF) 22 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83850C
Description  100 Mb/s TX/T4 Repeater Interface Controller (100RIC??
PDF  37 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83850C Datasheet(HTML) 22 Page - National Semiconductor (TI)

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5.0 DP83850C Applications (Continued)
22
www.national.com
is the BTL logic transceiver family: this approach has the
advantage of significantly lower noise and may assist in
successful passing of FCC and other EMI tests.
Figure 8 shows the signal connections on the Inter-RIC
bus. The pull up resistors on the DP83850C should be a
minimum of 1.2 k
Ω.
Lower values may be required
depending on layout/loading, especially on the /ACTIVEO
and /IR_ACTIVE signals where short deassertion time is
critical. The value of the pull up resistor terminations on
the inter repeater bus backplane will depend upon the bus
loading. The values should be chosen so that the signals
on the bus have fast enough edges to meet the DP83850C
inter repeater bus timings. The inter repeater bus will need
to be terminated properly at each end to prevent signal
reflections from causing problems
Figure 6. DP83850C Repeater ID Number Interface
Figure 7. DP83850C Stand-alone Inter Repeater Bus Interface
+5V
RID4
RID3
RID2
RID1
RID0
DIP
Switches
4.7 kohm
Pull up
resistors
DP83850C
100RIC
VCC
IR_VECT4
/ACTIVEO
/IR_COL_OUT
/IR_COL_IN
/IR_ACTIVE
IR_VECT3
IR_VECT2
IR_VECT1
IR_VECT0
DP83850C
100RIC
IRD3
IRD2
IRD1
IRD0
IRD_CK
/IRD_V
/IRD_ER
MD3
MD2
MD1
MD0
MD_CK
/MD_V
/MD_ER
IRD_ODIR
1.2 kohm
Pull-Ups
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC



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