CDCFR83

DIRECT RAMBUS CLOCK GENERATOR

SCAS665B − APRIL 2001 REVISED OCTOBER 2005

4

POST OFFICE BOX 655303

PLL divider selection

Table 1 lists the supported REFCLK and BUSCLK frequencies. Other REFCLK frequencies are permitted,

provided that (267 MHz < BUSCLK < 533 MHz) and (33 MHz < REFCLK < 100 MHz).

Table 1. REFCLK and BUSCLK Frequencies

MULT0

MULT1

REFCLK

(MHz)

MULTIPLY

RATIO

BUSCLK

(MHz)

0

0

67

4

267

0

1

50

6

300

0

1

67

6

400

1

1

33

8

267

1

1

50

8

400

1

1

67

8

533

1

0

67

16/3

356

Table 2. Clock Output Driver States

STATE

PWRDNB

STOPB

CLK

CLKB

Powerdown

0

X

GND

GND

CLK stop

1

0

VX, STOP

VX, STOP

Normal

1

1

PACLK/PLLCLK/

REFCLK†

PACLKB/PLLCLKB/

REFCLKB

† Depending on the state of S0, S1, and S2

−0.5 V to 4 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation

see Dissipation Rating Table

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−40

°C to 85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

260

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to the GND terminals.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C‡

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

DBQ

1400 mW

11 mW/

°C

905 mW

740 mW

‡ This is the inverse of the junction-to-ambient thermal resistance when board-mounted and with no air flow.