DP83850CVF National Semiconductor, DP83850CVF Datasheet - Page 22

• Manufacturer Part Number: DP83850CVF
• Description: IC CONTROLLER INTERFACE 132-PQFP
• Manufacturer: National Semiconductor

Specifications of DP83850CVF

• Controller Type: Ethernet Repeater Interface Controller
• Interface: Serial
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 295mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 132-MQFP, 132-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83850CVF

5.0 DP83850C Applications
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 .
depending on layout/loading, especially on the /ACTIVEO
and /IR_ACTIVE signals where short deassertion time is
Lower values may be required
Figure 7. DP83850C Stand-alone Inter Repeater Bus Interface
DP83850C
100RIC
Figure 6. DP83850C Repeater ID Number Interface
/IR_COL_OUT
/IR_ACTIVE
/IR_COL_IN
DP83850C
IR_VECT4
IR_VECT3
IR_VECT2
IR_VECT0
IRD_ODIR
/ACTIVEO
IR_VECT1
100RIC
/IRD_ER
IRD_CK
/MD_ER
MD_CK
/IRD_V
/MD_V
(Continued)
IRD3
IRD2
IRD1
IRD0
MD3
MD2
MD1
MD0
RID4
RID3
RID2
RID1
RID0
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
4.7 kohm
resistors
Pull up
22
V CC
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
+5V
Switches
DIP
1.2 kohm
Pull-Ups
www.national.com