2

ICS93V855

0497B—06/01/04

Pin Descriptions

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

GND

PWR

Ground pin.

2

DDRC0

OUT

"Complimentary" Clock of differential pair output.

3

DDRT0

OUT

"True" Clock of differential pair output.

4

VDD2.5

PWR

Power supply, nominal 2.5V

5

CLK_INT

IN

"True" reference clock input.

6

CLK_INC

IN

"Complimentary" reference clock input.

7

AVDD2.5

PWR

2.5V Analog Power pin for Core PLL

8

AGND

PWR

Analog Ground pin for Core PLL

9

GND

PWR

Ground pin.

10

DDRC1

OUT

"Complimentary" Clock of differential pair output.

11

DDRT1

OUT

"True" Clock of differential pair output.

12

VDD2.5

PWR

Power supply, nominal 2.5V

13

DDRT2

OUT

"True" Clock of differential pair output.

14

DDRC2

OUT

"Complimentary" Clock of differential pair output.

15

GND

PWR

Ground pin.

16

DDRC3

OUT

"Complimentary" Clock of differential pair output.

17

DDRT3

OUT

"True" Clock of differential pair output.

18

VDD2.5

PWR

Power supply, nominal 2.5V

19

GND

PWR

Ground pin.

20

FB_INC

IN

Complement single-ended feedback input, provides feedback signal to

internal PLL for synchronization with CLK_INT to eliminate phase error.

21

FB_INT

IN

True single-ended feedback input, provides feedback signal to internal

PLL for synchronization with CLK_INT to eliminate phase error.

22

VDD2.5

PWR

Power supply, nominal 2.5V

23

FB_OUTT

OUT

True single-ended feedback output, dedicated external feedback. It

switches at the same frequency as other DDR outputs, This output must

be connect to FB_INT.

24

FB_OUTC

OUT

Complement single-ended feedback output, dedicated external feedback.

It switches at the same frequency as other DDR outputs, This output must

be connect to FB_INC.

25

GND

PWR

Ground pin.

26

VDD2.5

PWR

Power supply, nominal 2.5V

27

DDRT4

OUT

"True" Clock of differential pair output.

28

DDRC4

OUT

"Complimentary" Clock of differential pair output.