IDT77V1253L25PGI IDT, Integrated Device Technology Inc, IDT77V1253L25PGI Datasheet - Page 30

• Manufacturer Part Number: IDT77V1253L25PGI
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT77V1253L25PGI

• Data Rate: 25.6/51.2Mbps
• Number Of Channels: 3
• Type Of Atm Phy Interface: DPI/UTOPIA
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Pin Count: 144
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

TRIPLE PORT PHY (PHYSICAL LAYER) FOR 25.6
AND 51.2 MBPS ATM NETWORKS
LINE SIDE (SERIAL) INTERFACE
and two pins for differential serial receiving.
PHY TO MAGNETICS INTERFACE
cabling is shown in Figure 35. Note that the transmit signal is somewhat
attenuated in order to meet the launch amplitude specified by the standards.
The receive circuitry is designed to attenuate low frequencies in order to
compensate for the high frequency attenuation of the cable.
TABLE 3 — ANALOG COMPONENT
VALUES
Each of the four ports has two pins for differential serial transmission,
A standard connection to 100ý and 120ý unshielded twisted pair
Component
1
2
3
4
5
6
7
8
R1
R2
R3
R4
R5
R6
R7
R8
R9
C1
C2
L1
7
8
10
9
2700Ω
2700Ω
470pF
470pF
Value
3.3µH
620Ω
110Ω
47Ω
47Ω
82Ω
33Ω
33Ω
14
Magnetics
3
4
13
Figure 35. Recommended Connection to Magnetics
AGND
5
12
AGND
16
15
Tolerance
1
2
+20%
+20%
+20%
+5%
+5%
+5%
+5%
+5%
+5%
+5%
+5%
+5%
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R3
R8
C2
C1
R9
R1
R2
30
Magnetics Modules for 25.6 Mbps
Magnetics Modules for 51.2 Mbps
slightly different voltages. This is done so that the receiver does not receive false
signals in the absence of a real signal. This can be important because the
77V1253 does not disable error detection or interrupts when an input signal is
not present.
sufficient bandwidth. Such a device can also operate satisfactorily at 25.6 Mbps.
Pulse PE-67583 or R4005
TDK TLA-6M103
Valor SF1153
Pulse R4005
Also, the receive circuitry biases the positive and negative RX inputs to
When connecting to UTP at 51.2 Mbps, it is necessary to use magnetics with
R5
R4
AVDD
R6
AGND
R7
L1
TxD+
TxD-
RxD+
RxD-
IDT77V1253
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4781 drw 36
IDT77V1253