14

©2020 Renesas Electronics Corporation

February 19, 2020

9SQL4952/9SQL4954/9SQL4958 Datasheet

1 Guaranteed by design and characterization, not 100% tested in production.

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REF is trimmed to 25.00MHz.

3 Default SMBus value.

4 When driven by a crystal.

Table 14. REF Output

Parameter

Symbol

Conditions

Minimum

Typical

Maximum

Units

Notes

Long Accuracy

ppm

See Tperiod min-max values.

0

ppm

1,2

Clock Period

Tperiod

REF output.

40

ns

2

High Output Voltage

VHIGH

IOH = -2mA.

0.8 x VDDREF

V

Low Output Voltage

VLOW

IOL = 2mA.

0.2 x VDDREF

V

Rise/Fall Slew Rate

trf1

Byte 3 = 1F, VOH = 0.8 × VDD,

VOL = 0.2 × VDD.

0.5

0.9

1.5

V/ns

1

trf1

Byte 3 = 5F, VOH = 0.8 × VDD,

VOL = 0.2 × VDD.

1.0

1.5

2.5

V/ns

1,3

trf1

Byte 3 = 9F, VOH = 0.8 × VDD,

VOL = 0.2 × VDD.

1.5

2.1

3.1

V/ns

1

trf1

Byte 3 = DF, VOH = 0.8 × VDD,

VOL = 0.2 × VDD.

2.0

2.7

3.8

V/ns

1

Duty Cycle

dt1X

VT = VDD/2 V.

45

49.7

55

%

1,4

Jitter, Cycle to Cycle

tjcyc-cyc

VT = VDD/2 V.

35

125

ps

1,4

Noise Floor

tjdBc1k

1kHz offset.

-145

-135

dBc

1,4

tjdBc10k

10kHz offset to Nyquist.

-150

-140

dBc

1,4

Jitter, Phase

tjphREF

12kHz to 5MHz, DIF SSC off.

0.13

0.3

ps (rms)

1,4

12kHz to 5MHz, DIF SSC on.

1.4

1.5

ps (rms)

1,4