SM320F28335PTPMEP Datasheet, PDF (109/167 Pages) Texas Instruments – Digital Signal Controller (DSC)

SM320F28335-EP
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SPRS581D – JUNE 2009 – REVISED MAY 2012
6.7 Clock Requirements and Characteristics
Table 6-5. Input Clock Frequency
PARAMETER
Resonator (X1/X2)
f_x
Input clock frequency
Crystal (X1/X2)
External oscillator/clock
source (XCLKIN or X1 pin)
150-MHz device
100-MHz device
f_l
Limp mode SYSCLKOUT frequency range (with /2 enabled)
MIN TYP MAX UNIT
20
35
20
35
MHz
4
150
4
100
1-5
MHz
Table 6-6. XCLKIN Timing Requirements - PLL Enabled
NO.
C8
C9
C10
C11
C12
t_c(CI)
t_f(CI)
t_r(CI)
t_w(CIL)
t_w(CIH)
Cycle time, XCLKIN
Fall time, XCLKIN⁽¹⁾
Rise time, XCLKIN⁽¹⁾
Pulse duration, XCLKIN low as a percentage of t_c(OSCCLK) ⁽¹⁾
Pulse duration, XCLKIN high as a percentage of t_c(OSCCLK) ⁽¹⁾
(1) This applies to the X1 pin also.
MIN
33.3
45
45
MAX
200
6
6
55
55
UNIT
ns
ns
ns
%
%
Table 6-7. XCLKIN Timing Requirements - PLL Disabled
NO.
C8 t_c(CI)
C9 t_f(CI)
C10 t_r(CI)
C11
C12
t_w(CIL)
t_w(CIH)
Cycle time, XCLKIN
150-MHz device
Fall time, XCLKIN⁽¹⁾
100-MHz device
Up to 30 MHz
Rise time, XCLKIN⁽¹⁾
30 MHz to 150 MHz
Up to 30 MHz
30 MHz to 150 MHz
Pulse duration, XCLKIN low as a percentage of t_c(OSCCLK) ⁽¹⁾
Pulse duration, XCLKIN high as a percentage of t_c(OSCCLK) ⁽¹⁾
(1) This applies to the X1 pin also.
MIN
6.67
10
45
45
The possible configuration modes are shown in Table 3-16.
MAX
250
250
6
2
6
2
55
55
UNIT
ns
ns
ns
ns
ns
%
%
Table 6-8. XCLKOUT Switching Characteristics (PLL Bypassed or Enabled)^{(1) (2)}
NO.
PARAMETER
MIN
C1 t_c(XCO)
Cycle time, XCLKOUT
150-MHz device
6.67
100-MHz device
10
C3 t_f(XCO)
C4 t_r(XCO)
C5 t_w(XCOL)
C6 t_w(XCOH)
t_p
Fall time, XCLKOUT
Rise time, XCLKOUT
Pulse duration, XCLKOUT low
Pulse duration, XCLKOUT high
PLL lock time
H–2
H–2
(1) A load of 40 pF is assumed for these parameters.
(2) H = 0.5t_c(XCO)
(3) OSCCLK is either the output of the on-chip oscillator or the output from an external oscillator.
TYP
2
2
MAX
UNIT
ns
H+2
H+2
131072t_c(OSCCLK) ⁽³⁾
ns
ns
ns
ns
cycles
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Electrical Specifications 109