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SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
USB_MXI
USB_MXO
USB_V SSOSC
USB_V DDOSC
V SS
USB_V DDA3P3
Crystal
12 MHz
C1
C2
3.3 V
3.3 V
Figure 5-7. 12-MHz USB Oscillator
USB_MXI
USB_MXO
USB_V SSOSC
USB_V DDOSC
V SS
USB_V DDA3P3
Figure 5-8. Connections when USB Oscillator is Permanently Disabled
The crystal should be in fundamental-mode operation, and parallel resonant, with a maximum effective
series resistance (ESR) specified in Table 5-2 . The load capacitors, C1 and C2 are the total capacitance
of the circuit board and components, excluding the IC and crystal. The load capacitor value is usually
approximately twice the value of the crystal's load capacitance, CL, which is specified in the crystal
manufacturer's datasheet and should be chosen such that the equation below is satisfied. All discrete
components used to implement the oscillator circuit should be placed as close as possible to the
associated oscillator pins (USB_MXI and USB_MXO) and to the USB_V SSOSC pin.
C 1 2
CL =
C
( C 1 + C 2 )
Table 5-2. Input Requirements for Crystal on the 12-MHz USB Oscillator
PARAMETER
Start-up time (from power up until oscillating at stable frequency of 12 MHz) (1)
MIN
NOM
0.100
MAX
10
UNIT
ms
Oscillation frequency
ESR
12
100
MHz
?
Frequency stability
(2)
±100
ppm
Maximum shunt capacitance
Maximum crystal drive
(1)
The startup time is highly dependent on the ESR and the capacitive load of the crystal.
(2)
If the USB is used, a 12-MHz, ±100-ppm crystal is recommended.
5
330
pF
μ W
Copyright ? 2010–2013, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
Product Folder Links: TMS320C5515
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