Integrated

Circuit

Systems, Inc.

ICS951411

0891E—03/07/05

Pin Configuration

Recommended Application:

ATI RS400 systems using Intel P4

Output Features:

•

6 - Pairs of SRC/PCI-Express clocks

•

2 - Pairs of ATIG (SRC/PCI Express*) clocks

•

3 - Pairs of Intel P4 clocks

•

3 - 14.318 MHz REF clocks

•

1 - 48MHz USB clock

•

1 - 33 MHz PCI clock seed

Key Specifications:

•

CPU outputs cycle-cycle jitter < 85ps

•

SRC output cycle-cycle jitter <125ps

•

PCI outputs cycle-cycle jitter < 250ps

•

+/- 300ppm frequency accuracy on CPU & SRC clocks

Features/Benefits:

•

2- Programmable Clock Request pins for SRC clocks

•

Supports CK410 or CK409 frequency table mapping

•

Spread Spectrum for EMI reduction

•

Outputs may be disabled via SMBus

•

External crystal load capacitors for maximum

frequency accuracy

56-pin SSOP & TSSOP

*Other names and brands may be claimed as the property of others.

Functionality - (CK410# = 0)

FS_C

CPU

MHz

SRC

MHz

PCI

MHz

REF

MHz

MHz

0

266.66 100.00 33.33

14.318 48.000

1

133.33 100.00 33.33

14.318 48.000

0

200.00 100.00 33.33

14.318 48.000

1

166.66 100.00 33.33

14.318 48.000

0

333.33 100.00 33.33

14.318 48.000

1

100.00 100.00 33.33

14.318 48.000

0

400.00 100.00 33.33

14.318 48.000

1

14.318 48.000

Functionality - (CK410# = 1)

FS_C

1

Byte6

bit5

FS_B

CPU

MHz

SRC

MHz

PCI

MHz

REF

MHz

MHz

00

100.00 100.00 33.33

14.318 48.000

10

200.00 100.00 33.33

14.318 48.000

01

133.33 100.00 33.33

14.318 48.000

11

166.67 100.00 33.33

14.318 48.000

00

200.00 100.00 33.33

14.318 48.000

10

400.00 100.00 33.33

14.318 48.000

01

266.67 100.00 33.33

14.318 48.000

11

333.33 100.00 33.33

14.318 48.000

specifications in the Input/Supply/Common Output Parameters Table for correct values.

RESERVED

1

0

0

0

1

1

0

1

X1 1

56 VDDREF

X2 2

55 GND

VDD48 3

54 **FS_A/REF0

USB_48MHz 4

53 **FS_B/REF1

GND 5

52 **TEST_SEL/REF2

VTT_PWRGD#/PD 6

51 VDDPCI

SCLK 7

50 **CK410#/PCICLK0

SDATA 8

49 GNDPCI

**FS_C 9

48 *CPU_STOP#

**CLKREQA# 10

47 CPUCLKT0

**CLKREQB# 11

46 CPUCLKC0

SRCCLKT7 12

45 VDDCPU

SRCCLKC7 13

44 GNDCPU

VDDSRC 14

43 CPUCLKT1

GNDSRC 15

42 CPUCLKC1

SRCCLKT6 16

41 CPUCLKT2_ITP

SRCCLKC6 17

40 CPUCLKC2_ITP

SRCCLKT5 18

39 VDDA

SRCCLKC5 19

38 GNDA

GNDSRC 20

37 IREF

VDDSRC 21

36 GNDSRC

SRCCLKT4 22

35 VDDSRC

SRCCLKC4 23

34 SRCCLKT0

SRCCLKT3 24

33 SRCCLKC0

SRCCLKC3 25

32 VDDATI

GNDSRC 26

31 GNDATI

ATIGCLKT1 27

30 ATIGCLKT0

ATIGCLKC1 28

29 ATIGCLKC0

Note: Pins preceeded by '**' have a 120 Kohm Internal Pull Down resistor

Pins preceeded by '*' have a 120 Kohm Internal Pull Up resistor