CDCR81

DIRECT RAMBUS

™ CLOCK GENERATOR

SCAS606B – NOVEMBER 1998 – REVISED NOVEMBER 1999

2

POST OFFICE BOX 655303

description (continued)

The CDCR81 is characterized for operation over free-air temperatures of 0

°C to 85°C.

functional block diagram

Bypass MUX

Test MUX

B

A

PLL

Phase

Aligner

PACLK

PLLCLK

ByPCLK

CLK

CLKB

REFCLK

φD

SYNCLKN

PCLKM

MULT0

MULT1

2

PWRDWNB

S0

S1

S2

STOPB

FUNCTION TABLE†

MODE

S0

S1

S2

CLK

CLKB

Normal

0

0

0

Phase aligned clock

Phase aligned clock B

Bypass

1

0

0

PLLCLK

PLLCLKB

Test

1

1

0

REFCLK

REFCLKB

Output test (OE)

0

1

X

Hi-Z

Hi-Z

Reserved

0

0

1

—

—

Reserved

1

0

1

—

—

Reserved

1

1

1

Hi-Z

Hi-Z

† X = don’t care, Hi-Z = high impedance