TMS470MF06607 datasheet(40/65 Pages) TI2

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OSCIN

OSCOUT

OSCIN

OSCOUT

Crystal

(a)

(b)

External

Clock Signal

(toggling 0-1.5 V)

(A)

TMS470MF06607

SPNS157C

– JANUARY 2012

www.ti.com

5.2

PLL and Clock Specifications

Table 5-7. Timing Requirements for PLL Circuits Enabled or Disabled

PARAMETER

MIN

MAX

UNIT

f(OSC)

Input clock frequency

MHz

tc(OSC)

Cycle time, OSCIN

tw(OSCIL)

Pulse duration, OSCIN low

tw(OSCIH)

Pulse duration, OSCIN high

5.2.1

External Reference Resonator/Crystal Oscillator Clock Option

The oscillator is enabled by connecting the appropriate fundamental 5-20 MHz resonator/crystal and load

capacitors across the external OSCIN and OSCOUT pins as shown in Figure 5-5(a). The oscillator is a

single stage inverter held in bias by an integrated bias resistor.

TI strongly encourages each customer to submit samples of the device to the resonator/crystal

vendors for validation. Vendors are equipped to determine which load capacitors will best tune their

resonator/crystal

the

microcontroller

device

for

optimum

start-up

and

operation

over

temperature/voltage extremes.

5.2.2

External Clock Source

An external oscillator source can be used by connecting a 1.5-V clock signal to the OSCIN pin and leaving

the OSCOUT pin unconnected (open) as shown in Figure 5-5(b).

The values of C1 and C2 should be provided by the resonator/crystal vendor.

Figure 5-5. Recommended Crystal/Clock Connection

Peripheral Information and Electrical Specifications

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