6.6 System Oscillators Timing Requirements

over operating free-air temperature range(unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

SYSTEM OSCILLATORS

Clock frequency, MOSC(1)

19.998

20.002

MHz

Cycle time, MOSC(1)

49.995

50.005

MHz

Pulse duration(2), MOSC, high

50% to 50% reference points

(signal)

20

ns

Pulse duration(2), MOSC, low

50% to 50% reference points

(signal)

20

ns

Transition time(2), MOSC, tt = tf /tr

20% to 80% reference points

(signal)

12

ns

Period Jitter(2), MOSC (This is the deviation

in period from the ideal period due solely to

high frequency jitter).

18

ps

(1)

The frequency range for MOSC is 20 MHz with +/-100 PPM accuracy (it includes impact to accuracy due to aging, temperature and

trim sensitivity). The MOSC input cannot support spread spectrum clock spreading.

(2)

Applies only when driven via an external digital oscillator.

6.7 Test and Reset Timing Requirements

MIN

MAX

UNIT

Pulse duration, inactive low, PWRGOOD

50% to 50% reference points

(signal)

4.0

µs

Pulse duration, inactive low, PWRGOOD

50% to 50% reference points

(signal)

1000(2)

ms

20% to 80% reference points

(signal)

625

µs

Pulse duration, inactive low, POSENSE

50% to 50% reference points

(signal)

500

µs

Pulse duration, inactive low, POSENSE

50% to 50% reference points

(signal)

1000(2)

ms

20% to 80% reference points

(signal)

25(1)

µs

Power Hold time, POSENSE remains active after

PWRGOOD is de-asserted

20% to 80% reference points

(signal)

500

µs

Early Warning time, PWRGOOD goes inactive low prior to

any power supply voltage going below its specification

500

µs

The sum of PWRGOOD and POSENSE inactive time

1050(2)

ms

(1)

As long as noise on this signal is below the hysteresis threshold.

(2)

With 1.8 V power applied. If the 1.8 V power is disabled by the controller command (For example – if system is placed in Low Power

mode where the controller disables 1.8 V power), these signals can be placed and remain in their inactive state indefinitely.

DLPC4430

DLPS223 – DECEMBER 2021

www.ti.com

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