SCAS641

– JULY 2000

4

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

Function Tables

SELECT FUNCTIONS

INPUTS

OUTPUTS

FUNCTION

SEL100/133

SelA

SelB

HOST, HCLK

3VMREF, 3VMREF

PCI

3V66

3V48

REF

FUNCTION

0

0

0

100 MHz

50 MHz

33 MHz

66 MHz

48 MHz

14.318 MHz

Active 100 MHz

0

1

1

Hi-Z

Hi-Z

Hi-Z

Hi-Z

Hi-Z

Hi-Z

All outputs 3-stated

1

0

0

133 MHz

66 MHz

33 MHz

66 MHz

48 MHz

14.318 MHz

Active 133 MHz

1

1

1

TCLK/2

TCLK/4

TCLK/8

TCLK/4

TCLK/2

TCLK

Test Mode

ENABLE FUNCTION

INPUT

OUTPUTS

SEL100/133

HCLK

HCLK

3VMREF, 3VMREF

PCI

3V66

3V48

REF

0

2 IREF

Not driven

L

L

L

L

L

1

On

On

On

On

On

On

On

SPREAD SPECTRUM FUNCTION

INPUT

OUTPUTS

SPREAD

0

Spread spectrum clocking active,

–0.6% at HCLK/HCLK, 3VMREF/3VMREF, 3V66, PCI

SPREAD

1

Spread spectrum clocking nonactive

OUTPUT BUFFER SPECIFICATIONS

BUFFER NAME

VDD RANGE

(V)

IMPEDANCE

( )

BUFFER TYPE

3V48, REF

3.135

– 3.465

20

–60

TYPE 3

PCI, 3V66

3.135

– 3.465

12

–65

TYPE 5

3VMREF/3VMREF

3.135

– 3.465

12

–55

TYPE 5

HCLK/HCLK

TYPE X1

OUTPUT BUFFER SPECIFICATIONS

INPUTS

BOARD TARGET

REFERENCE R,

OUTPUT CURRENT

VOH AT Z

MultSel0

MultSel1

BOARD TARGET

TRACE/TERM Z

REFERENCE R,

IREF = VDD/3 Rr)

OUTPUT CURRENT

VOH AT Z

IREF = 2.32 mA

0

0

60

Rr = 475 1%, IREF = 2.32 mA

IOH = 5 IREF

0.71 V at 60

0

0

50

Rr = 475 1%, IREF = 2.32 mA

IOH = 5 IREF

0.59 V at 50

0

1

60

Rr = 475 1%, IREF = 2.32 mA

IOH = 6 IREF

0.85 V at 60

0

1

50

Rr = 475 1%, IREF = 2.32 mA

IOH = 6 IREF

0.71 V at 50

1

0

60

Rr = 475 1%, IREF = 2.32 mA

IOH = 4 IREF

0.56 V at 60

1

0

50

Rr = 475 1%, IREF = 2.32 mA

IOH = 4 IREF

0.47 V at 50

1

1

60

Rr = 475 1%, IREF = 2.32 mA

IOH = 7 IREF

0.99 V at 60

1

1

50

Rr = 475 1%, IREF = 2.32 mA

IOH = 7 IREF

0.82 V at 50

NOTE: The entries in boldface are the primary system configurations of interest. The outputs should be optimized for these configurations