CY28323 datasheet(3/22 Pages) CYPRESS | FTG for Intel® Pentium® 4 CPU and Chipsets

3 page

PRELIMINARY

CY28323

Document #: 38-07004 Rev. *B

Page 3 of 22

24_48MHz/FS1

I/O

24- or 48-MHz Output/Frequency Select 1: 3.3V fixed 24-MHz or 48-MHz

non-spread spectrum output. This pin also serves as a power-on strap option to

determine device operating frequency as described in Table 4.

This output will be used as the reference clock for SIO devices in Intel 845

(Brookdale) platforms. For Intel Brookdale - G platforms, this output will be used

as the reference clock for both USB host controller and SIO devices. We recom-

mend system designer to configure this output as 48 MHz and “HIGH Drive” by

setting Byte [5], Bit [0] and Byte [9], Bit [7], respectively.

PWR_DWN#

Power Down Control: 3.3V LVTTL-compatible input that places the device in

power-down mode when held LOW.

SCLK

SMBus Clock Input: Clock pin for serial interface.

SDATA

I/O

SMBus Data Input: Data pin for serial interface.

RST#

(open-

drain)

System Reset Output: Open-drain system reset output.

IREF

Current Reference for CPU Output: A precision resistor is attached to this pin

which is connected to the internal current reference.

VTT_PWRGD#

Powergood from Voltage Regulator Module (VRM): 3.3V LVTTL input.

VTT_PWRGD# is a level-sensitive strobe used to determine when FS0:4 and

MULTSEL0:1 inputs are valid and OK to be sampled (Active LOW). Once

VTT_PWRGD# is sampled LOW, the status of this input will be ignored.

VDD_REF,

VDD _PCI,

VDD_48MHz,

VDD_3V66,

VDD_CPU

2, 9, 18, 24,

32, 39, 46

3.3V Power Connection: Power supply for CPU outputs buffers, 3V66 output

buffers, PCI output buffers, reference output buffers and 48-MHz output buffers.

Connect to 3.3V.

GND_PCI,

GND_48MHz,

GND_3V66,

GND_CPU,

GND_REF,

5, 13, 21, 29,

36, 43, 47

Ground Connection: Connect all ground pins to the common system ground

plane.

VDD_CORE

3.3V Analog Power Connection: Power supply for core logic, PLL circuitry. Con-

nect to 3.3V.

GND_CORE

Analog Ground Connection: Ground for core logic, PLL circuitry.

Pin Definitions (continued)

Pin Name

Pin No.

Type

Pin Description

Part Number	Components Description	Html View	Manufacturer
CY28324	FTG for Intel® Pentium® 4 CPU and Chipsets	1 2 3 4 5 More	SpectraLinear Inc
CY28349	FTG for Intel® Pentium® 4 CPU and Chipsets	1 2 3 4 5 More	SpectraLinear Inc
CY28349B	FTG for Intel® Pentium® 4 CPU and Chipsets	1 2 3 4 5 More	SpectraLinear Inc
CY28323PVC	FTG for Intel® Pentium® 4 CPU and Chipsets	1 2 3 4 5 More	SpectraLinear Inc
CY28344	FTG for Intel Pentium 4 CPU and Chipsets	1 2 3 4 5 More	SpectraLinear Inc
CY28378	FTG for Pentium 4® and Intel® 845 Series Chipset	1 2 3 4 5 More	SpectraLinear Inc
CY28317-2	FTG for Mobile VIA™ PL133T and PLE133T Chipsets	1 2 3 4 5 More	SpectraLinear Inc
8224	CLOCK GENERATOR AND DRIVER FOR 8080A CPU	1 2 3 4 5	Intel Corporation
CY2277A	Pentium®/II 6x86 K6 Clock Synthesizer/Driver for Desktop/ Mobile PCs with Intel® 82430TX and 2 DIMMs or 3 SO-DIMMs	1 2 3 4 5 More	SpectraLinear Inc
CY28325-3	FTG for VIA™ Pentium 4™ Chipsets	1 2 3 4 5 More	SpectraLinear Inc

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