Philips Semiconductors

Preliminary specification

PCK2011

Direct Rambus

™ Clock Generator

1999 Jan 19

7

Table 3. DC DEVICE CHARACTERISTICS

Symbol

Parameter

Min

Max

Unit

Supply voltage

3.135

3.465

V

Ambient operating temperature

0

70

°C

Refclk Input cycle time

10

40

ns

–

250

ps

Input duty cycle over 10,000 cycles

40%

60%

Input frequency of modulation

30

33

kHz

Modulation index

0.25

0.5

%

Modulation index for triangular modulation

–

0.6

%

–

%

Phase Detector input cycle time at PclkM & SynClkN

30

100

ns

Initial Phase error at Phase Detector inputs (Required range of Phase Aligner)

–0.5

0.5

Phase Detector input duty cycle over 10,000 cycles

25%

75%

Input slew rate (measured at 20% – 80% of input voltage) for PclkM, SynClkN, and Refclk

1

4

V/ns

–

7

pF

∆C

IN,PD

–

0.5

pF

–

10

pF

Input (CMOS) signal low voltage

–

0.3

Vdd

Input (CMOS) signal high voltage

0.7

–

Vdd

Refclk input low voltage

–

0.3

VddI,R

Refclk input high voltage

0.7

–

VddI,R

Input signal low voltage for PD inputs and StopB

–

0.3

VddI,PD

Input signal high voltage for PD inputs and StopB

0.7

–

VddI,PD

Input supply reference for Refclk

1.3

3.3

V

Input supply reference for PD inputs

1.3

3.3

V

NOTES:

3. If the input modulation is used, input modulation is allowed but not required.

4. The amount of allowed spreading for any non-triangular modulation is determined by the induced downstream tracking skew, which cannot

exceed the skew generated by the specified 0.6% triangular modulation. Typically, the amount of allowed non-triangular modulation is about

0.5%.