9LPRS477D

PROGRAMMABLE SYSTEM CLOCK CHIP FOR ATI RD790-K8TM BASED SYSTEMS

IDT®

PROGRAMMABLE SYSTEM CLOCK CHIP FOR ATI RD790-K8TM BASED SYSTEMS

20

9LPRS477D

REV C 010715

Electrical Characteristics–USB - 48MHz

Electrical Characteristics–REF-14.318MHz

P ARAMETE R

SYMBOL

CONDITIONS*

MIN

TYP

MAX

UNITS NOTES

Long Accuracy

ppm

see Tperiod min-max values

-100

100

ppm

1,2

Clock period

T

peri od

48.00MHz output nominal

20.8229

20.8344

ns

2

Clock Low Time

T

low

Measure from < 0.6V

9.3750

11.4580

ns

2

Clock High Time

T

high

Measure from > 2.0V

9.3750

11.4580

ns

2

Output High Voltage

VOH

IOH = -1 mA

2.4

V

1

Output Low Voltage

V

OL

I

OL = 1 mA

0.55

V

1

V

OH @ MIN = 1.0 V

-33

mA

1

V

OH @MAX = 3.135 V

-33

mA

1

VOL @ MIN = 1.95 V

30

mA

1

V OL @ MAX = 0.4 V

38

mA

1

Rise Time

t

r_USB

V

OL = 0.4 V , VOH = 2. 4 V

0.5

1.5

ns

1

Fall Time

t

f_ USB

V

OH = 2.4 V, VOL = 0. 4 V

0.5

1.5

ns

1

Duty Cycle

d

t1

VT = 1.5 V

45

55

%1

Group S kew

tskew

VT = 1.5 V

250

ps

1

Jitter, Cycle to cycle

tjcyc-cyc

VT = 1.5 V

130

ps

1,2

*TA = 0 - 70°C; S upply Voltage VDD = 3.3 V +/-5%, CL = 5pF with Rs = 33Ω (unless otherwise specified)

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

2 IDT recommended and/or chipset vendor layout guidelines must be followed to meet this specification

Output High Current

I

OH

Output Low Current

IOL

P ARAMETE R

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Notes

Long Accuracy

ppm

see Tperiod min-max values

-300

300

ppm

1,2

Clock period

Tperiod

14.318MHz output nominal

69.8270

69.8550

ns

2

Clock Low Time

T

low

Measure from < 0.6V

30.9290

37.9130

ns

2

Clock High Time

T

high

Measure from > 2.0V

30.9290

37.9130

ns

2

Outp ut High Volta ge

VOH

IOH = -1 mA

2.4

V

1

Output Low Voltage

VOL

IOL = 1 mA

0.4

V

1

Output High Current

IOH

V

OH @MIN = 1.0 V ,

VOH@MAX = 3.135 V

-29

-23

mA

1

Output Low Current

IOL

VOL @MIN = 1.95 V,

V

OL @MAX = 0.4 V

29

27

mA

1

Rise Time

tr1

V OL = 0.4 V, VOH = 2.4 V

1

1.5

ns

1

Fall Time

t

f1

V

OH = 2.4 V, V OL = 0. 4 V

11.5

ns

1

Skew

t

sk1

V

T = 1.5 V

250

ps

1

Duty Cycle

dt1

VT = 1.5 V

45

55

%

1

Ji tter

tjcyc-cyc

VT = 1.5 V

200

ps

1

*TA = 0 - 70°C; S upply Voltage VDD = 3.3 V +/-5%, CL = 5pF with Rs = 33Ω (unless otherwise specified)

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

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 14.31818MHz