Datasheet

TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439M –JUNE 2007–REVISED AUGUST 2012 www.ti.com
6.7 Clock Requirements and Characteristics
Table 6-6. Input Clock Frequency
PARAMETER MIN TYP MAX UNIT
Resonator (X1/X2) 20 35
Crystal (X1/X2) 20 35
f
x
Input clock frequency MHz
150-MHz device 4 150
External oscillator/clock
source (XCLKIN or X1 pin)
100-MHz device 4 100
f
l
Limp mode SYSCLKOUT frequency range (with /2 enabled) 1 - 5 MHz
Table 6-7. XCLKIN Timing Requirements – PLL Enabled
NO. MIN MAX UNIT
C8 t
c(CI)
Cycle time, XCLKIN 33.3 200 ns
C9 t
f(CI)
Fall time, XCLKIN
(1)
6 ns
C10 t
r(CI)
Rise time, XCLKIN
(1)
6 ns
C11 t
w(CIL)
Pulse duration, XCLKIN low as a percentage of t
c(CI)
(1)
45 55 %
C12 t
w(CIH)
Pulse duration, XCLKIN high as a percentage of t
c(CI)
(1)
45 55 %
(1) This applies to the X1 pin also.
Table 6-8. XCLKIN Timing Requirements – PLL Disabled
NO. MIN MAX UNIT
150-MHz device 6.67 250
C8 t
c(CI)
Cycle time, XCLKIN ns
100-MHz device 10 250
Up to 30 MHz 6
C9 t
f(CI)
Fall time, XCLKIN
(1)
ns
30 MHz to 150 MHz 2
Up to 30 MHz 6
C10 t
r(CI)
Rise time, XCLKIN
(1)
ns
30 MHz to 150 MHz 2
C11 t
w(CIL)
Pulse duration, XCLKIN low as a percentage of t
c(CI)
(1)
45 55 %
C12 t
w(CIH)
Pulse duration, XCLKIN high as a percentage of t
c(CI)
(1)
45 55 %
(1) This applies to the X1 pin also.
The possible configuration modes are shown in Table 3-19.
Table 6-9. XCLKOUT Switching Characteristics (PLL Bypassed or Enabled)
(1) (2)
NO. PARAMETER MIN TYP MAX UNIT
150-MHz device 6.67
C1 t
c(XCO)
Cycle time, XCLKOUT ns
100-MHz device 10
C3 t
f(XCO)
Fall time, XCLKOUT 2 ns
C4 t
r(XCO)
Rise time, XCLKOUT 2 ns
C5 t
w(XCOL)
Pulse duration, XCLKOUT low H – 2 H + 2 ns
C6 t
w(XCOH)
Pulse duration, XCLKOUT high H – 2 H + 2 ns
t
p
PLL lock time 131072t
c(OSCCLK)
(3)
cycles
(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.
126 Electrical Specifications Copyright © 2007–2012, Texas Instruments Incorporated
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