2

ICS9179B-01

Pin Descriptions

Power Groups

VDD = Power supply for SDRAM buffer

PIN NUMBER

PIN NAME

TYPE

DESCRIPTION

4, 5, 8, 9

SDRAM (0:3)

OUT

SDRAM Byte 0 clock outputs

1

13, 14, 17, 18

SDRAM (4:7)

OUT

31, 32, 35, 36

SDRAM (8:11)

OUT

SDRAM Byte 2 clock outputs

1

40, 41, 44, 45

SDRAM (12:15)

OUT

SDRAM Byte 3 clock outputs

1

21, 28

SDRAM (16:17)

OUT

SDRAM clock outputs useable for feedback.

1

11

BUF_IN

IN

Input for buffers

38

OE

IN

Tri-states all outputs when held LOW. Has internal pull-up.

2

24

SDATA

I/O

Data pin for I

25

SCLK

I/O

Clock pin for I

3, 7, 12, 16, 20,

29, 33, 37, 42, 46

VDD

PWR

3.3V Power supply for SDRAM buffer

6, 10, 15, 19, 22,

27, 30, 34, 39, 43

GND

PWR

Ground for SDRAM buffer

23

VDDS

PWR

3.3V Power supply for I

26

GNDS

PWR

Ground for I

1, 2, 47, 48

N/C

-

Pins are not internally connected

Notes:

1.

At power up all eighteen SDRAM outputs are enabled and active.

2.

OE has a 100K Ohm internal pull-up resistor to keep all outputs active.

3.

The SDATA and SCLK inputs both also have internal pull-up resistors with values above 100K Ohms as well for

complete platform flexibility.

Ground Groups

GND = Ground for SDRAM buffer