TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439I–JUNE 2007–REVISED MARCH 2011
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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
28.6
20
NOM
MAX UNIT
tc(OSC), Cycle time
Frequency
50
35
ns
MHz
ns
On-chip oscillator clock
XCLKIN(1)
tc(CI), Cycle time
Frequency
6.67
4
250
150
500
150
2000
150
MHz
ns
tc(SCO), Cycle time
Frequency
6.67
2
SYSCLKOUT
XCLKOUT
MHz
ns
tc(XCO), Cycle time
Frequency
6.67
0.5
6.67
MHz
ns
tc(HCO), Cycle time
Frequency
13.3(3)
75(3)
26.7(3)
37.5(3)
HSPCLK(2)
150
75(4)
25
MHz
ns
tc(LCO), Cycle time
Frequency
13.3
40
LSPCLK(2)
MHz
ns
tc(ADCCLK), Cycle time
Frequency
ADC clock
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
28.6
20
10
4
NOM
MAX UNIT
tc(OSC), Cycle time
Frequency
50
35
ns
MHz
ns
On-chip oscillator clock
XCLKIN(1)
tc(CI), Cycle time
Frequency
250
100
500
100
2000
100
MHz
ns
tc(SCO), Cycle time
Frequency
10
2
SYSCLKOUT
XCLKOUT
MHz
ns
tc(XCO), Cycle time
Frequency
10
0.5
10
MHz
ns
tc(HCO), Cycle time
Frequency
20(3)
50(3)
40(3)
25(3)
HSPCLK(2)
100
100
25
MHz
ns
tc(LCO), Cycle time
Frequency
10
40
LSPCLK(2)
MHz
ns
tc(ADCCLK), Cycle time
Frequency
ADC clock
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.
126
Electrical Specifications
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