Texas Instruments TMS320F2806 Clock Requirements and Characteristics, Input Clock Frequency

TMS320F2809, TMS320F2808, TMS320F2806

TMS320F2802, TMS320F2801, TMS320C2802

TMS320C2801, TMS320F28016, TMS320F28015

www.ti.com SPRS230L –OCTOBER 2003 –REVISED DECEMBER 2009

6.7Clock Requirements and Characteristics

Table 6-8. Input Clock Frequency

	PARAMETER			MIN TYP	MAX	UNIT
		Resonator (X1/X2)		20	35
fx	Input clock frequency	Crystal (X1/X2)		20	35	MHz
		External oscillator/clock	100-MHz device	4	100
		source (XCLKIN or X1 pin)	60-MHz device	4	60
fl	Limp mode SYSCLKOUT frequency range (with /2 enabled)			1–5		MHz

Table 6-9. XCLKIN(1) Timing Requirements - PLL Enabled

NO.			MIN	MAX	UNIT
C8	tc(CI)	Cycle time, XCLKIN	33.3	200	ns
C9	tf(CI)	Fall time, XCLKIN		6	ns
C10	tr(CI)	Rise time, XCLKIN		6	ns
C11	tw(CIL)	Pulse duration, XCLKIN low as a percentage of tc(OSCCLK)	45	55	%
C12	tw(CIH)	Pulse duration, XCLKIN high as a percentage of tc(OSCCLK)	45	55	%

(1)This applies to the X1 pin also.

Table 6-10. XCLKIN(1) Timing Requirements - PLL Disabled

NO.				MIN	MAX	UNIT
C8	tc(CI)	Cycle time, XCLKIN	100-MHz device	10	250	ns
			60-MHz device	16.67	250
C9	tf(CI)	Fall time, XCLKIN	Up to 20 MHz		6	ns
			20 MHz to 100 MHz		2	ns
C10	tr(CI)	Rise time, XCLKIN	Up to 20 MHz		6	ns
			20 MHz to 100 MHz		2	ns
C11	tw(CIL)	Pulse duration, XCLKIN low as a percentage of tc(OSCCLK)		45	55	%
C12	tw(CIH)	Pulse duration, XCLKIN high as a percentage of tc(OSCCLK)		45	55	%

(1)This applies to the X1 pin also.

The possible configuration modes are shown in Table 3-17.

Table 6-11. XCLKOUT Switching Characteristics (PLL Bypassed or Enabled)(1) (2)

NO.		PARAMETER		MIN TYP	MAX	UNIT
C1	tc(XCO)	Cycle time, XCLKOUT	100-MHz device	10		ns
			60-MHz device	16.67
C3	tf(XCO)	Fall time, XCLKOUT		2		ns
C4	tr(XCO)	Rise time, XCLKOUT		2		ns
C5	tw(XCOL)	Pulse duration, XCLKOUT low		H – 2	H + 2	ns
C6	tw(XCOH)	Pulse duration, XCLKOUT high		H – 2	H + 2	ns
	tp	PLL lock time			(3)	cycles
					131072tc(OSCCLK)

(1)A load of 40 pF is assumed for these parameters.

(2)H = 0.5tc(XCO)

(3)OSCCLK is either the output of the on-chip oscillator or the output from an external oscillator.

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