Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
Datasheet
Total PPM Budget, the combination of these two values must be approximately +/-45 PPM
(allowing for aging).
Note 7.13 Frequency Deviation Over Time is also referred to as Aging.
Note 7.14 The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as
+/- 50 PPM.
Note 7.15 This number includes the pad, the bond wire and the lead frame. PCB capacitance is not
included in this value. The XTAL1/CLKIN and XTAL2 pin and PCB capacitance values are
required to accurately calculate the value of the two external load capacitors. These two
external load capacitors determine the accuracy of the 25.000 MHz frequency.
SMSC LAN9215i
137
Revision 1.93 (12-12-07)
DATASHEET
SMSC [ SMSC CORPORATION ]
