Datasheet
TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
www.ti.com
SPRS439M –JUNE 2007–REVISED AUGUST 2012
6.6.3 Device Clock Table
This section provides the timing requirements and switching characteristics for the various clock options
available. Table 6-4 through Table 6-5 list the cycle times of various clocks.
Table 6-4. Clocking and Nomenclature (150-MHz Devices)
MIN NOM MAX UNIT
t
c(OSC)
, Cycle time 28.6 50 ns
On-chip oscillator clock
Frequency 20 35 MHz
t
c(CI)
, Cycle time 6.67 250 ns
XCLKIN
(1)
Frequency 4 150 MHz
t
c(SCO)
, Cycle time 6.67 500 ns
SYSCLKOUT
Frequency 2 150 MHz
t
c(XCO)
, Cycle time 6.67 2000 ns
XCLKOUT
Frequency 0.5 150 MHz
t
c(HCO)
, Cycle time 6.67 13.3
(3)
ns
HSPCLK
(2)
Frequency 75
(3)
150 MHz
t
c(LCO)
, Cycle time 13.3 26.7
(3)
ns
LSPCLK
(2)
Frequency 37.5
(3)
75
(4)
MHz
t
c(ADCCLK)
, Cycle time 40 ns
ADC clock
Frequency 25 MHz
(1) This also applies to the X1 pin if a 1.9-V oscillator is used.
(2) Lower LSPCLK and HSPCLK will reduce device power consumption.
(3) This is the default value if SYSCLKOUT = 150 MHz.
(4) Although LSPCLK is capable of reaching 100 MHz, it is specified at 75 MHz since the smallest valid "Low-speed peripheral clock
prescaler register" value is "2" for 150-MHz devices.
Table 6-5. Clocking and Nomenclature (100-MHz Devices)
MIN NOM MAX UNIT
t
c(OSC)
, Cycle time 28.6 50 ns
On-chip oscillator clock
Frequency 20 35 MHz
t
c(CI)
, Cycle time 10 250 ns
XCLKIN
(1)
Frequency 4 100 MHz
t
c(SCO)
, Cycle time 10 500 ns
SYSCLKOUT
Frequency 2 100 MHz
t
c(XCO)
, Cycle time 10 2000 ns
XCLKOUT
Frequency 0.5 100 MHz
t
c(HCO)
, Cycle time 10 20
(3)
ns
HSPCLK
(2)
Frequency 50
(3)
100 MHz
t
c(LCO)
, Cycle time 10 40
(3)
ns
LSPCLK
(2)
Frequency 25
(3)
100 MHz
t
c(ADCCLK)
, Cycle time 40 ns
ADC clock
Frequency 25 MHz
(1) This also applies to the X1 pin if a 1.8-V oscillator is used.
(2) Lower LSPCLK and HSPCLK will reduce device power consumption.
(3) This is the default value if SYSCLKOUT = 100 MHz.
Copyright © 2007–2012, Texas Instruments Incorporated Electrical Specifications 125
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