ICS557-03

2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE

PCIE SSCG

IDT®

2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE

7

ICS557-03

REV U 112111

AC Electrical Characteristics - CLKOUT, HCSL

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

° C

1 Test setup is R

L=50 ohms with 2 pF, Rr = 475Ω (1%).

2 Measurement taken from a single-ended waveform.

3 Measurement taken from a differential waveform.

4 Measured at the crossing point where instantaneous voltages of both CLKOUT and CLKOUT are equal.

5 CLKOUT pins are tri-stated when OE is asserted low. CLKOUT is driven differential when OE is high unless its PD= low.

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Input Frequency

25

MHz

Output Frequency

HCSL termination

200

MHz

Output High Voltage1,2

VOH

660

700

850

mV

Output Low Voltage1,2

VOL

-150

0

27

mV

Crossing Point

Voltage1,2

Absolute

250

350

550

mV

Crossing Point

Voltage1,2,4

Variation over all edges

140

mV

Jitter, Cycle-to-Cycle1,3

80

ps

Modulation Frequency

Spread spectrum

30

31.5

33

kHz

Rise Time1,2

tOR

From 0.175 V to 0.525 V

175

332

700

ps

Fall Time1,2

tOF

From 0.525 V to 0.175 V

175

344

700

ps

Skew between outputs

At crossing point Voltage

50

ps

Duty Cycle1,3

45

55

%

Output Enable Time5

All outputs

12

us

Output Disable Time5

All outputs

12

us

Power-up Time

tSTABLE

From power-up VDD=3.3 V

3.0

3.5

ms

Spread Change Time

tSPREAD Settling period after spread change

3.0

3.5

ms