9179BF-01LF Datasheet ICS9179BF-01, ICS9179BF-01T, 9179BF-01LF | P1-P3

Integrated

Circuit

Systems, Inc.

General Description Features

ICS9179B-01

Block Diagram

PentiumPro is a trademark of Intel Corporation

C is a trademark of Philips Corporation

Low Skew Buffers

0256E—12/15/08

Pin Configuration

The ICS9179B-01 generates SDRAM clock buffers

required for high speed RISC or CISC microprocessor

systems such as Intel PentiumPro or Pentium II. An

output enable is provided for testability.

The device is a buffer with low output to output skew. This

is a Fanout buffer device, not using an internal PLL. This

buffer can also be a feedback to an external PLL stage for

phase synchronization to a master clock.

The individual clock outputs are addressable through I

to be enabled, or stopped in a low state for reduced EMI

when the lines are not needed.

• High speed, low noise non-inverting (0:17) buffer for

SDRAM clock buffer applications.

• Supports up to four SDRAM DIMMS

• Synchronous clocks skew matched to 250ps

window on SDRAM.

• I

C Serial Configuration interface to allow individual

clocks to be stopped.

• Multiple VDD, VSS pins for noise reduction

• Tri-state pin for testing

• Custom configurations available

• 3.0V – 3.7V supply range

• 48-pin SSOP package

48-Pin SSOP

ICS9179B-01

Pin Descriptions

Power Groups

VDD = Power supply for SDRAM buffer

VDDS = Power supply for I

C circuitry

PIN NUMBER PIN NAME TYPE DESCRIPTION

4, 5, 8, 9 SDRAM (0:3) OUT SDRAM Byte 0 clock outputs

13, 14, 17, 18 SDRAM (4:7) OUT SDRAM Byte 1 clock outputs

31, 32, 35, 36 SDRAM (8:11) OUT SDRAM Byte 2 clock outputs

40, 41, 44, 45 SDRAM (12:15) OUT SDRAM Byte 3 clock outputs

21, 28 SDRAM (16:17) OUT SDRAM clock outputs useable for feedback.

11 BUF_IN IN Input for buffers

38 OE IN

Tri-states all outputs when held LOW. Has internal

pull-up.

24 SDATA I/O Data pin for I

C circuitry

25 SCLK I/O Clock pin for I

C circuitry

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

C circuitry

26 GNDS PWR Ground for I

C circuitry

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

GNDS = Ground for I

C circuitry

ICS9179B-01

VDD

This is the power supply to the internal core logic of the

device as well as the clock output buffers for

SDRAM(0:17).

This pin operates at 3.3V volts. Clocks from the listed

buffers that it supplies will have a voltage swing from

Ground to this level. For the actual guaranteed high and

low voltage levels for the Clocks, please consult the DC

parameter table in this data sheet.

GND

This is the power supply ground (common or negative)

return pin for the internal core logic and all the output

buffers.

SDRAM(0:17)

These Output Clocks are use to drive Dynamic RAM’s

and are low skew copies of the CPU Clocks. The voltage

swing of the SDRAM’s output is controlled by the supply

voltage that is applied to VDD of the device, operates at

3.3 volts.

The SDATA and SCLOCK Inputs are use to program the

device. The clock generator is a slave-receiver device in

the I

C protocol. It will allow read-back of the registers.

See configuration map for register functions. The I

specification in Philips I

C Peripherals Data Handbook

(1996) should be followed.

BUF_IN

Input for Fanout buffers (SDRAM 0:17).

OE tristates all outputs when held low.

VDDS

This is the power supply to I

C circuitry.

GNDS

This is the ground to I

C circuitry.

Technical Pin Function Descriptions

P1-P3 P4-P6 P7-P9 P10-P10

9179BF-01LF

Mfr. #:

Buy 9179BF-01LF

Manufacturer:

Description:

IC CLK BUFFER 1:18 150MHZ 48SSOP

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9179BF-01LF

9179BF-01LF

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