WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 427

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

Design Considerations—82574 GbE Controller
Figure 64.
13.4
Note:
Recommended Crystal Placement and Layout
Oscillator Support
The 82574 clock input circuit is optimized for use with an external crystal. However, an
oscillator can also be used in place of the crystal with the proper design considerations
(see
The power consumption of additional circuitry equals about 1.5 mW.
• Route XTAL1 and XTAL2 traces to nearest inside corners of crystal pad (see
• Ensure that the traces from XTAL1 and XTAL2 are symmetrically routed and that
• The total trace length of XTAL1 or XTAL2 should be less than 750 mils.
• The clock oscillator has an internal voltage regulator of 1.9 V dc to isolate it from
• The input capacitance introduced by the 82574 (approximately 20 pF) is greater
• The input clock jitter from the oscillator can impact the 82574 clock and its
Figure
their lengths are matched.
the external noise of other circuits to minimize jitter. If an external clock is used,
this imposes a maximum input clock amplitude of 1.9 V dc. For example, if a
3.3 V dc oscillator is used, it's signal should be attenuated to a maximum of
1.9 V dc with a resistive divider circuit.
than the capacitance specified by a typical oscillator (approximately 15 pF).
performance.
Table 88
Crystal Pad
64, point B).
for detail clock oscillator specifications):
Capacitor
27pF
0402
“B”
Ethernet Controller
Less than 660 mils
Xtal2
Crystal
“A”
Xtal1
“B”
Capacitor
27pF
0402
Crystal Pad
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