DLPA2000 datasheet(19/63 Pages) TI

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6.10 System Oscillator Timing Requirements

MIN

NOM

MAX

UNIT

fclk

Clock frequency, MOSC (primary oscillator clock)(1)

23.998

24.000

24.002

MHz

Cycle time, MOSC (clock period)(1)

See Figure 6-5

41.663

41.667

41.670

tw(H)

Pulse duration as percent of tc (2), MOSC, high

50% to 50% reference points

(signal)

40%

50%

tw(L)

Pulse duration as percent of tc (2), MOSC, low

50% to 50% reference points

(signal)

40%

50%

Transition time(2), MOSC

20% to 80% reference points

(rising signal)

80% to 20% reference points

(falling signal)

tjp

Long-term, peak-to-peak, period jitter(2), MOSC

(that is the deviation in period from ideal period due solely to

high frequency jitter)

(1)

The frequency accuracy for MOSC is ±200 PPM. This includes impact to accuracy due to aging, temperature, and trim sensitivity. The

MOSC input does not support spread spectrum clock spreading.

(2)

Applies only when driven by an external digital oscillator.

MOSC

tW(H)

50%

80%

20%

tW(L)

Figure 6-5. System Oscillators

6.11 Power Supply and Reset Timing Requirements

MIN

MAX

UNIT

tw(L)

Pulse duration, active low, RESETZ

50% to 50% reference points (signal)

1.25

µs

Rise time, RESETZ(1)

20% to 80% reference points (signal)

0.5

µs

Fall time, RESETZ(1)

80% to 20% reference points (signal)

0.5

µs

trise

Rise time, VDD (during VDD ramp up at turn-

on)

0.3 V to 1.045 V (VDD)

(1)

For more information on RESETZ, see Section 5.

RESETZ

DC Power Supplies

80%

50%

20%

tw(L)

80%

50%

20%

Time

Figure 6-6. Power-Up and Power-Down RESETZ Timing

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