IDTTM/ICSTM

Programmable System Clock Chip for ATI RS/RD690 K8TM - based Systems

1211B—09/17/09

ICS951464

IDTTM/ICSTM Programmable System Clock Chip for ATI RS/RD690 K8

TM - based Systems

17

Electrical Characteristics - HTTCLK Clock

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Notes

Long Accuracy

ppm

see Tperiod min-max values

-300

300

ppm

1,2

33.33MHz output nominal

29.9910

30.0090

ns

2

33.33MHz output spread

29.9910

30.1598

ns

2

66.67MHz output nominal

14.9955

15.0045

ns

2

66.67MHz output spread

14.9955

15.0799

ns

2

Output High Voltage

VOH

IOH = -1 mA

2.4

V

1

Output Low Voltage

VOL

IOL = 1 mA

0.55

V

1

V OH @MIN = 1.0 V

-33

mA

1

VOH@ MAX = 3.135 V

-33

mA

1

VOL @ MIN = 1.95 V

30

mA

1

VOL @ MAX = 0.4 V

38

mA

1

Edge Rate

δV/δt

Rising edge rate

1

4

V/ns

1

Edge Rate

δV/δt

Falling edge rate

1

4

V/ns

1

Rise Time

tr1

VOL = 0.4 V, VOH = 2.4 V

0.5

2

ns

1

Fall Time

tf1

VOH = 2.4 V, VOL = 0.4 V

0.5

2

ns

1

Duty Cycle

dt1

VT = 1.5 V

45

55

%

1

Jitter, Cycle to cycle

tjcyc-cyc

VT = 1.5 V

180

ps

1

*TA = 0 - 70°C; VDD=3.3V +/-5%; CL = 30 pF (unless otherwise specified)

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

2 All Long Term Accuracy and Clock Period specifications are guaranteed with the assumption that REF is at 14.31818MHz

Output High Current

IOH

Output Low Current

IOL

PCI33 Clock period

HTT66 Clock period

Tperiod

Tperiod

Electrical Characteristics - SRC/ATIG 0.7V Current Mode Differential Pair

PARAMETER

SYMBOL

CONDITIONS*

MIN

TYP

MAX

UNITS

Notes

Current Source Output

Impedance

Zo

VO = Vx

3000

Ω

1

Voltage High

VHigh

660

850

mV

1,3

Voltage Low

VLow

-150

150

mV

1,3

Max Voltage

Vovs

1150

mV

1

Min Voltage

Vuds

-300

mV

1

Crossing Voltage (abs)

Vx(abs)

250

550

mV

1

Crossing Voltage (var)

d-Vx

Variation of crossing over all

edges

140

mV

1

Long Accuracy

ppm

see Tperiod min-max values

-300

300

ppm

1,2

100.00MHz nominal

9.9970

10.0030

ns

2

100.00MHz spread

9.9970

10.0533

ns

2

Absolute min period

Tabsmin

100.00MHz nominal/spread

9.8720

ns

1,2

Rise Time

tr

VOL = 0.175V, VOH = 0.525V

175

700

ps

1

Fall Time

tf

VOH = 0.525V VOL = 0.175V

175

700

ps

1

Rise Time Variation

d-tr

VOL = 0.175V, VOH = 0.525V

125

ps

1

Fall Time Variation

d-tf

VOH = 0.525V VOL = 0.175V

125

ps

1

Duty Cycle

dt3

Measurement from differential

wavefrom

45

55

%

1

Skew

tsk3

VT = 50%

100

ps

1

Jitter, Cycle to cycle

tjcyc-cyc

Measurement from differential

wavefrom

85

ps

1

*TA = 0 - 70°C; VDD = 3.3 V +/-5%; CL =2pF, RS=33.2

Ω, RP=49.9Ω, ΙREF = 475Ω

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

3I

REF = VDD/(3xRR). For RR = 475

Ω (1%), IREF = 2.32mA. IOH = 6 x IREF and VOH = 0.7V @ ZO=50Ω.

Average period

Tperiod

Statistical measurement on

single ended signal

Measurement on single ended

signal using absolute value.