ICS9179BF-01 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS9179BF-01

Low Skew Buffers

Integrated Circuit Systems 

ICS9179 B -01

Pin Descriptions

PIN NUMBER

4, 5, 8, 9

13, 14, 17, 18

31, 32, 35, 36

40, 41, 44, 45

21, 28

11

38

24

25

3, 7, 12, 16, 20,

29, 33, 37, 42, 46

6, 10, 15, 19, 22,

27, 30, 34, 39, 43

23

26

1, 2, 47, 48

PIN NAME

SDRAM (0:3)

SDRAM (4:7)

SDRAM (8:11)

SDRAM (12:15)

SDRAM (16:17)

BUF_IN

OE

SDATA

SCLK

VDD

GND

VDDS

GNDS

N/C

TYPE

OUT

OUT

OUT

OUT

OUT

IN

IN

I/O

I/O

DESCRIPTION

SDRAM Byte 0 clock outputs1

SDRAM Byte 1 clock outputs1

SDRAM Byte 2 clock outputs1

SDRAM Byte 3 clock outputs1

SDRAM clock outputs useable for feedback.1

Input for buffers

Tri-states all outputs when held LOW. Has internal pull-up.2

Data pin for I2C circuitry3

Clock pin for I2C circuitry3

PWR 3.3V Power supply for SDRAM buffer

PWR Ground for SDRAM buffer

PWR

PWR

-

3.3V Power supply for I2C circuitry

Ground for I2C circuitry

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.

Power Groups

VDD = Power supply for SDRAM buffer

VDDS = Power supply for I2C circuitry

Ground Groups

GND = Ground for SDRAM buffer

GNDS = Ground for I2C circuitry

2

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