TMS320VC5507 datasheet(69/108 Pages) TI1

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C12

X2/CLKIN

CLKOUT

BypassMode

C10

C11

NOTE A: The relationshipofX2/CLKINtoCLKOUT dependsonthePLL multiplyanddividefactorchosenfortheCLKMDregister. Thewaveform

relationship shown in Figure 53 is intendedtoillustratethetimingparametersbasedonCLKOUT =1xCLKINconfiguration.

−

(

)

RTCINX1

Crystal

32.768 kHz

SM320VC5507-EP

www.ti.com

SPRS613 – SEPTEMBER 2009

Table 5-5. Multiply-By-N Clock Option Switching Characteristics

CVDD = 1.2 V

CVDD = 1.35 V

CVDD = 1.6 V

NO.

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

tc(CI)

tc(CI) x

tc(CO)

Cycle time, CLKOUT

9.26

1600

6.95

1600

N(1)

tf(CO)

Fall time, CLKOUT

tr(CO)

Rise time, CLKOUT

tw(COL)

Pulse duration, CLKOUT low

H - 1

H + 1

H - 1

H + 1

H - 1

H + 1

tw(COH)

Pulse duration, CLKOUT high

H - 1

H + 1

H - 1

H + 1

H - 1

H + 1

Delay time, X2/CLKIN high/low to

C12

td(CI–CO)

CLKOUT high/low

(1)

N = Clock frequency synthesis factor

Figure 5-4. External Multiply-by-N Clock Timings

5.6.5

Real-Time Clock Oscillator With External Crystal

The real-time clock module includes an oscillator circuit. The oscillator requires an external 32.768-kHz crystal

connected across the RTCINX1 and RTCINX2 pins. The connection of the required circuit, consisting of the

crystal and two load capacitors, is shown in Figure 5-5. The load capacitors, C1 and C2, should be chosen such

that Equation 4 below is satisfied. CL in Equation 4 is the load specified for the crystal.

(4)

Figure 5-5. Real-Time Clock Oscillator With External Crystal

Electrical Specifications

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