Philips Semiconductors

Product data

PCK2021

CK00 (100/133 MHz) spread spectrum differential

system clock generator

2001 Oct 11

5

Table 1. Host swing select functions

MULTSEL0

MULTSEL1

BOARD

IMPEDANCE

0

0

60

Ω

0.71 V

0

0

50

Ω

0.59 V

0

1

60

Ω

0.85 V

0

1

50

Ω

0.71 V

1

0

60

Ω

0.56 V

1

0

50

Ω

0.47 V

1

1

60

Ω

0.99 V

1

1

50

Ω

0.82 V

0

0

30

Ω

0.75 V

0

0

25

Ω

0.62 V

0

1

30

Ω

0.90 V

0

1

25

Ω

0.75 V

1

0

30

Ω

0.60 V

1

0

25

Ω

0.50 V

1

1

30

Ω

1.05 V

1

1

25

Ω

0.84 V

NOTE:

The outputs are optimized for the configurations shown shaded.

CONDITIONS

CONFIGURATION

LOAD

MIN.

MAX.

All combinations;

see Table 1 above

Nominal test load for

given configuration

see Table 1 above

see Table 1 above

All combinations;

see Table 1 above

Nominal test load for

given configuration

see Table 1 above

see Table 1 above

POWER-DOWN MODE

PWRDWN

HCLK/HCLKB

3V66

PCI

48MHz

REFCLK

Asserts LOW

0 = Active

Host_bar = undriven

LOW

LOW

LOW

LOW

NOTE:

The differential outputs should have a voltage forced across them when power-down is asserted.

SPREAD SPECTRUM FUNCTION

SPREAD #

FUNCTION

48 MHz PLL

REFCLK

1

Host, PCI, and 3V66

No Spread

No Spread

0

Host, PCI, and 3V66

spread

t0.5%

No Spread