ICS557-03

PCI-EXPRESS CLOCK SOURCE

PCIE SSCG

IDT™ / ICS™ PCI-EXPRESS CLOCK SOURCE

7

ICS557-03

REV K 102907

AC Electrical Characteristics - CLK0/CLK1, CLK0/CLK1

Unless stated otherwise, VDD=3.3 V ±10%, Ambient Temperature -40 to +85

° C

Note 2: Measurement taken from a single-ended waveform.

Note 3: Measurement taken from a differential waveform.

Note 4: Measured at the crossing point where instantaneous voltages of both CLK and CLK are equal.

Note 5: CLK pins are tri-stated when OE is low asserted. CLK is driven differential when OE is high.

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Input Frequency

25

MHz

Output Frequency

HCSL termination

25

200

MHz

LVDS termination

25

100

MHz

HCSL

660

700

850

mV

HCSL

-150

0

27

mV

Absolute

250

350

550

mV

Variation over all edges

140

mV

80

ps

Frequency Synthesis Error

All outputs

0

ppm

Modulation Frequency

Spread spectrum

30

31.5

33

kHz

From 0.175 V to 0.525 V

175

332

700

ps

From 0.525 V to 0.175 V

175

344

700

ps

125

ps

Output to Output Skew

50

ps

45

55

%

All outputs

10

us

All outputs

10

us

Stabilization Time

From power-up VDD=3.3 V

3.0

ms

Spread Spectrum Transition

Time

Stabilization time after spread

spectrum changes

3.0

ms