TMS570LS datasheet(68/107 Pages) TI1

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OSCIN

OSCOUT

(see Note A)

Crystal

(a)

(b)

External

(toggling 0-1.5V)

Clock Signal

Kelvin_GND

(see Note B)

OSCOUT

OSCIN

TMS570LS20206-EP, TMS570LS20216-EP

SPNS209A – JUNE 2012 – REVISED AUGUST 2012

www.ti.com

Peripheral and Electrical Specifications

7.1

Clocks

7.1.1

PLL And Clock Specifications

Table 7-1. Timing Requirements For PLL Circuits Enabled Or Disabled

MIN

MAX

Unit

f(OSC)

(1)

Input clock frequency

MHz

f(OSC)

Input clock frequency

MHz

tc(OSC)

Cycle time, OSCIN

tw(OSCIL)

Pulse duration, OSCIN low

tw(OSCIH)

Pulse duration, OSCIN high

f(OSCRST)

(1)

OSC FAIL frequency - upper level

MHz

f(OSCRST)

(1)

OSC FAIL frequency - lower level

1.5

MHz

(1)

This parameter is characterized from -40°C to 125°C only.

7.1.2

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 section (a) of the figure below. The

oscillator is a single stage inverter held in bias by an integrated bias resistor. This resistor is disabled

during leakage test measurement and HALT mode.

NOTE

TI strongly encourages each customer to submit samples of the device to the

resonator/crystal vendors for validation. The vendors are equipped to determine what load

capacitors will best tune their resonator/crystal to the microcontroller device for optimum

start-up and operation over temperature/voltage extremes.

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

the OSCOUT pin unconnected (open) as shown in section (b) of the figure below.

Figure 7-1. Recommended Crystal/Clock Connection

NOTE

In figure (a), The values of C1 and C2 should be provided by the resonator/crystal vendor.

In figure (b), Kelvin_GND should not be connected to any other GND.

Peripheral and Electrical Specifications

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