3

ICS950401

0499C—11/01/04

General Description

The ICS950401 is a main clock synthesizer chip for AMD-K8. This provides all clocks required for Clawhammer and

Sledgehammer systems.

Spread spectrum may be enabled through I

to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS950401

employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and

temperature variations.

Serial programming I

Power Groups

VDDA = PLL2

Pin 32

VDDA = VDD for Core PLL

Pin 43

VDDREF = REF, Xtal

Pin 2

Skew Characteristics

Parameter

Description

Test Conditons

Skew

Window

Unit

measured at x-ing of CPU,

250

ps

measured at x-ing of CPU,

1.5V of PCI clock

2000

ps

measured between rising

edge at 1.5V

500

ps

measured between rising

edge at 1.5V

500

ps

measured between rising

edge at 1.5V

2000

ps

measured at x-ing of CPU,

1.5V of PCI clock

500

ps

measured at x-ing of CPU,

200

ps

measured at x-ing of CPU,

1.5V of PCI clock

200

ps

measured between rising

edge at 1.5V

200

ps

measured between rising

edge at 1.5V

200

ps

measured between rising

edge at 1.5V

200

ps

measured at x-ing of CPU,

1.5V of PCI clock

200

ps

time independent

skew

not dependent on

V, T changes

time variant skew

varies over

V, T changes