Datasheet

Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
Datasheet
Revision 1.0 (07-14-09) 22 SMSC USB3320
DATASHEET
4.10 Piezoelectric Resonator for Internal Oscillator
The internal oscillator may be used with an external quartz crystal or ceramic resonator as described
in Section 5.4.1.2. See Table 4.11 for the recommended crystal specifications. See Table 4.12 for the
ceramic resonator part numbers for commercial temperature applications. At this time, the ceramic
resonator does not offer sufficient temperature stability to operate over the industrial temperature
range.
Note 4.10 The required bit rate accuracy for Hi-Speed USB applications is ±500 ppm as provided in
the USB 2.0 Specification. This takes into account the effect of voltage, temperature, aging,
etc.
Note 4.11 0
o
C for commercial applications, -40
o
C for industrial applications.
Note 4.12 +70
o
C for commercial applications, +85
o
C for industrial applications.
Note 4.13 This number includes the pad, the bond wire and the lead frame. Printed Circuit Board
(PCB) capacitance is not included in this value. The PCB capacitance value and the
capacitance value of the XO and REFCLK pins are required to accurately calculate the
value of the two external load capacitors.
Note 4.14 This is a generic part number assigned by Murata. The oscillating frequency is affected by
stray capacitance on the Printed Circuit Board (PCB). Murata will assign the final part
number for each customer’s PCB after characterizing the customer’s PCB design.
Table 4.11 USB3320 Quartz Crystal Specifications
PARAMETER SYMBOL MIN NOM MAX UNITS NOTES
Crystal Cut AT, typ
Crystal Oscillation Mode Fundamental Mode
Crystal Calibration Mode Parallel Resonant Mode
Frequency F
fund
- Table 5.10 -MHz
Total Allowable PPM Budget - - ±500 PPM Note 4.10
Shunt Capacitance C
O
-7 typ-pF
Load Capacitance C
L
- 20 typ - pF
Drive Level P
W
0.5 - - mW
Equivalent Series Resistance R
1
--30Ohm
Operating Temperature Range Note 4.11 - Note 4.12
o
C
USB3320 REFCLK Pin
Capacitance
-3 typ-pFNote 4.13
USB3320 XO Pin Capacitance - 3 typ - pF Note 4.13
Table 4.12 USB3320 Ceramic Resonator Part Numbers
FREQUENCY MURATA PART NUMBER NOTES
24 MHz CSTCE24M0XK1***-R0 Commercial Temp Only, Note 4.14
26 MHz CSTCE26M0XK1***-R0 Commercial Temp Only, Note 4.14