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TMS320C5515
SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
www.ti.com
5.5
5.5.1
Clock PLLs
The device DSP uses a software-programmable PLL to generate frequencies required by the CPU, DMA,
and peripherals. The reference clock for the PLL is taken from either the CLKIN pin or the RTC on-chip
oscillator (as specified through the CLK_SEL pin).
PLL Device-Specific Information
There is a minimum and maximum operating frequency for CLKIN, PLLOUT, and the system clock
(SYSCLK). The system clock generator must be configured not to exceed any of these constraints
documented in this section (certain combinations of external clock inputs, internal dividers, and PLL
multiply ratios are not supported).
Table 5-3. PLL Clock Frequency Ranges
CV DD = 1.05 V
CV DD = 1.3 V
CLOCK SIGNAL NAME
V DDA_PLL = 1.3 V
V DDA_PLL = 1.3 V
UNIT
MIN
MAX
MIN
MAX
CLKIN (1)
RTC Clock
11.2896
12
12.288
32.768
11.2896
12
12.288
32.768
MHz
KHz
PLLIN
PLLOUT
SYSCLK
PLL_LOCKTIME
32.768
60
0.032768
170
120
60 or 75
4
32.768
60
0.032768
170
120
100 or 120
4
KHz
MHz
MHz
ms
(1)
These CLKIN values are used when the CLK_SEL pin = 1.
The PLL has lock time requirements that must be followed. The PLL lock time is the amount of time
needed for the PLL to complete its phase-locking sequence.
5.5.2
Clock PLL Considerations With External Clock Sources
If the CLKIN pin is used to provide the reference clock to the PLL, to minimize the clock jitter a single
clean power supply should power both the device and the external clock oscillator circuit. The minimum
CLKIN rise and fall times should also be observed. For the input clock timing requirements, see
Section 5.5.3 , Clock PLL Electrical Data/Timing (Input and Output Clocks) .
Rise/fall times, duty cycles (high/low pulse durations), and the load capacitance of the external clock
source must meet the device requirements in this data manual (see Section 4.3 , Electrical Characteristics
Over Recommended Ranges of Supply Voltage and Operating Temperature , and Section 5.5.3 , Clock
PLL Electrical Data/Timing (Input and Output Clocks) .
80
Peripheral Information and Electrical Specifications
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