SG590AYB [CYPRESS]

Processor Specific Clock Generator, CMOS, PDSO48, SSOP-48;


型号：	SG590AYB
厂家：	CYPRESS
描述：	Processor Specific Clock Generator, CMOS, PDSO48, SSOP-48 光电二极管外围集成电路
文件：	总7页 (文件大小：88K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SG590

II Systems

Low EMI Clock Generator for Pentium

Preliminary

PRODUCT FEATURES

FREQUENCY TABLE

FS2 FS1 FS0

CPU

PCI

37.5

Supports Pentium . Pentium II & Pro CPUs.

Designed to meet Intel chipset specification

12 CPU and 6 PCI clocks

One 48 MHz fixed clocks for USB.

One 24 MHz fixed clocks Super IO.

Separate power supply pins for mixed CPU, Fixed

and PCI clock voltages

100

33.3

Tri-State

XIN/2

Tri-State

XIN/4

< 250 ps Max. skew among CPU clocks.

< 250 ps Max. skew among PCI clocks.

Controlled current output buffers

48-pin SSOP package

Spread Spectrum EMI reduction mode

Selectable Spread Widths

66.6*

33.3*

27.5

* may be selected to - .625% or -1.0% down spread

CONNECTION DIAGRAM

SG590

REF1

REF2

VSS

VDDC

CPU12

VDDC

CPU11

BLOCK DIAGRAM

XIN

VDDR

Xin

REF[1:2]

XOUT

VSS

REF

OSC

VDDR

FS2

VSS

Xout

CPU10

CPU9

VDDC

CPU8

CPU1

CPU2

VSS

VDDC

VDDP

CPU[1:12]

PCI1

CPU7

CPU6

PCI2

FS[1:2]

PCI3

CPU5

VSS

PLL1

SWIDTH

SSON

PCI4

PCI[1:6]

VDDP

PCI5

CPU4

CPU3

VDDC

VDDF

PCI6

24M

48M

VSS

SSON

SWIDTH

VDDF

24M1

48M2

VSS

PLL2

VDD

FS0

FS1

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571

Rev 1.3

10/20/97

Page 1 of 7

SG590

Low EMI Clock Generator for Pentium II Systems

Preliminary

PIN DESCRIPTION

No.

Name

Xin

PWR

VDD

I/O

TYPE

Description

OSC1 On-chip reference oscillator input pin. Requires either an

external parallel resonant crystal (nominally 14.318 MHz) or

externally generated reference signal

Xout

VDD

OSC1 O-chip reference oscillator output pin. Drives an external

parallel resonant crystal when an externally generated reference

signal is used, is left unconnected

27, 26,

FS(0:2)

PAD

Frequency select input pins. See frequency select table on

page 1. These pin has an internal pull-up

8, 9,

CPU(1:12)

VDDC

BUF1 Clock outputs. CPU frequency table specified on page 1.

33, 34,

36, 37,

38, 39,

41, 42,

45, 47

11, 12,

13, 14,

16, 17

3, 10,

18, 24,

30, 35,

43, 44

PCI(1:7)

VSS

VDDP

BUF4 PCI bus clocks. See frequency select table on page 1.

PWR

Ground pins for the device.

VDDP

VDDF

VDDC

3.3 Volt power supply pins for PCI and PCI_F clock output

buffers.

3.3 Volt power supply pins for 24 Mhz and 48 MHz clock output

buffers.

3.3 or 2.5 Volt power supply pins for CPU clock output buffers.

PWR

32, 40,

46, 48

1, 2

VDD

REF(1:2)

24M

PWR

Power supply pins for analog circuits and core logic

VDDR

VDDF

BUF3 Buffered outputs of on-chip reference oscillator.

BUF3 Fixed 24 MHz frequency clock outputs.

BUF3 Fixed 48 MHz frequency clock outputs.

48M

PAD

When driven to a logic low level, this pin will tristate all output

clocks

SWIDTH

SSON

VDD

PAD

Selects 0.625 % or 1.0 % Spread spectrum modulation width.

1.0% = Logic High

When driven to a logic low level this pin enables EMI reducing

Spread Spectrum mode (affects only CPU and PCI clocks) for

CPU Frequency of 66.6 Mhz only.

VDDR

PWR

Power supply for reference clock (Ref) buffers

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571

Rev 1.3

10/20/97

Page 2 of 7

SG590

Low EMI Clock Generator for Pentium II Systems

Preliminary

SPECTRUM SPREAD CLOCKING

Down Spread

Amplitude

(dB)

Without Spectrum Spread

With Spectrum Spread

Frequency(MHz)

Center

Spectrum Analysis

CPU CLOCK SPECTRUM SPREADING SELECTION TABLE

Unspread SWIDTH

(MHz)

Min

(MHz)

Center

(MHz)

Max

(MHz)

% OF FREQUENCY

SPREADING

MODE

66.6

66.18

65.9

66.39

66.27

66.6

0.625 % ( - 0.625% + 0%)

1.0 % ( - 1.% + 0%)

Down Spread

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571

Rev 1.3

10/20/97

Page 3 of 7

SG590

Low EMI Clock Generator for Pentium II Systems

Preliminary

MAXIMUM RATINGS

This device contains circuitry to protect the inputs

Voltage Relative to VSS:

Voltage Relative to VDD:

Storage Temperature:

Operating Temperature:

Maximum Power Supply:

-0.3V

0.3V

against damage due to high static voltages or electric

field; however, precautions should be taken to avoid

application of any voltage higher than the maximum

rated voltages to this circuit. For proper operation, Vin

and Vout should be constrained to the range:

VSS<(Vin or Vout)<VDD

0ºC to + 125ºC

0ºC to +70ºC

Unused inputs must always be tied to an appropriate

logic voltage level (either VSS or VDD).

ELECTRICAL CHARACTERISTICS

Characteristic

Symbol Min

Typ

Max

0.8

Units

Conditions

Input Low Voltage

Input High Voltage

Input Low Current

Input High Current

VIL

VIH

IIL

Vdc

µA

2.0

-66

IIH

µA

Output Low Voltage

IOL = 4mA

VOL

0.4

Vdc

All Outputs (see buffer spec)

Output High Voltage

IOH = 4mA

VOH

2.4

Vdc

All Outputs Using 3.3V Power

(see buffer spec)

Tri-State leakage Current

Dynamic Supply Current

Static Supply Current

Ioz

Idd

TBD

µA

CPU = 66.6 MHz, PCI = 33.3 MHz

Isdd

Crystal Oscillator

Capacitance

Xin and Xout crystal load capacitance

values (each)

Short Circuit Current

ISC

1 output at a time - 30 seconds

VDD = VDDP=VDDF =3.3V ± %, VDDC =2.5V ± %,, TA = 0ºC to +70ºC

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571

Rev 1.3

10/20/97

Page 4 of 7

SG590

Low EMI Clock Generator for Pentium II Systems

Preliminary

SWITCHING CHARACTERISTICS

Characteristic

Symbol

Min

Typ

Max

Units

Conditions

Measured at 1.5V

Output Duty Cycle

CPU to PCI Offset

tOFF

1.5

CPU load = 20 pF, PCI load = 3 pF

measured at 1.5V PCI and 1.25V CPU

Buffer out Skew All CPU

Buffer Outputs

tSKEW₁

tSKEW₂

175

250

20 pf Load Measured at 1.5V

Buffer out Skew All PCI

Buffer Outputs

30 pf Load Measured at 1.5V

+250

500

∆

Period Adjacent Cycles

Jitter Spectrum 20 dB

Bandwidth from Center

BW_J

KHz

VDD = VDDP=VDDF =3.3V ± %, VDDC = 2.5V ± %, TA = 0ºC to +70ºC

BUFFER 1 CHARACTERISTICS FOR CPUCLK(1:12)

Characteristic

Symbol

Min

Typ

Max

Units

Conditions

Pull-Up Current Min

Pull-Up Current Max

Pull-Down Current Min

Pull-Down Current Max

IOH_min

IOH_max

IOL_min

IOL_max

TRF_min

-27

Vout = 1.0 V

Vout = 2.38 V

Vout = 1.2 V

Vout = 0.3 V

20 pF Load

-27

1.6

Rise/Fall Time Min

0.4

Between 0.4 V and 2.0 V

VDD = VDDP=VDDF=3.3V ± %, VDDC =2.5V ± %,, TA = 0ºC to +70ºC

BUFFER 3 CHARACTERISTICS FOR REF(1:2), 24M and 48 M

Characteristic

Symbol

Min

Typ

Max

Units

Conditions

Pull-Up Current Min

Pull-Up Current Max

Pull-Down Current Min

Pull-Down Current Max

IOH_min

IOH_max

IOL_min

IOL_max

TRF_min

-29

Vout = 1.0 V

Vout = 3.135 V

Vout = 1.95 V

Vout = 0.4 V

20 pF Load

-23

2.0

Rise/Fall Time

0.5

Between 0.4 V and 2.4 V

VDD = VDDP=VDDF =3.3V ± %, VDDC =2.5V ± %,, TA = 0ºC to +70ºC

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571

Rev 1.3

10/20/97

Page 5 of 7

SG590

Low EMI Clock Generator for Pentium II Systems

Preliminary

BUFFER 4 CHARACTERISTICS FOR PCICLK(1:6)

Characteristic

Symbol

Min

Typ

Max

Units

Conditions

Pull-Up Current Min

Pull-Up Current Max

Pull-Down Current Min

Pull-Down Current Max

IOH_min

IOH_max

IOL_min

IOL_max

TRF_max

-33

Vout = 1.0 V

-33

Vout = 3.135 V

Vout = 1.95 V

Vout = 0.4 V

30 pF Load

2.0

Rise/Fall Time

0.5

Between 0.4 V and 2.4 V

VDD = VDDP=VDDF =3.3V ± %, VDDC=2.5V ± %,, TA = 0ºC to +70ºC

CRYSTAL AND REFERENCE OSCILLATOR PARAMETERS

Characteristic

Symbol

Min

Typ

Max

Units

Conditions

Frequency

Tolerence

F_o

12.00

14.31818

16.00

+/-100

+/- 100

MHz

PPM

Calibration note 1

Stability (Ta -10 to +60C) note 1

Aging (first year @ 25C) note 1

Parallell Resonant

Mode

V_BIAS

Pin Capacitance

DC Bias Voltage

Startup time

Capacitance of XIN and Xout pins

0.3Vdd

Vdd/2

0.7Vdd

Load Capacitance

note 1

Effective Series

resonant

Ohms

resistance

Power Dissipation

Shunt Capacitance

X1 and X2 Load

0.10

note 1

internal crystal loading gapacitors

on each pin (to ground)

For maximum accuracy,the total circuit loading capacitance should be equal to CL. This loading capacitance is the

effective capacitance across the crystal pins and includes the device pin capacitance (CP) in parallel with any circuit

traces, the clock generator and any onboard discrete load capacitors.

Budgeting Calculations

Typical trace capacitance, (< half inch) is 4 pF, Load to the crystal is therefore

Clock generator internal pin capacitance of 36 pF, Load to the crystal is therefore

the total parasitic capacitance would therefore be

2.0 pF

18.0 pF

= 20.0 pF.(matching CL)

Note 1: It is recommended but not manditory that a crystal meets these specifications.

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571

Rev 1.3

10/20/97

Page 6 of 7

SG590

Low EMI Clock Generator for Pentium II Systems

Preliminary

PACKAGE DRAWING AND DIMENSIONS

48 PIN SSOP OUTLINE DIMENSIONS

INCHES

MILLIMETERS

SYMBOL

MIN

NOM

MAX

MIN

NOM

MAX

A₁

0.095

0.008

0.088

0.008

0.005

0.620

0.292

0.102

0.012

0.090

0.010

0.110

0.016

0.092

0.0135

0.010

0.630

0.299

2.41

2.59

0.31

2.79

0.20

0.41

2.24

2.29

2.34

0.203

0.127

15.75

7.42

0.254

0.343

0.254

16.00

7.59

0.625

0.296

0.025 BSC

0.406

0.013

0.032

5º

15.88

7.52

0.635 BSC

10.31

0.33

0.400

0.10

0.024

0º

0.410

0.016

0.040

8º

10.16

0.25

0.61

0º

10.41

0.41

1.02

8º

A₂

A₁

0.81

5º

0.085

0.093

0.100

2.16

2.36

2.54

ORDERING INFORMATION

Part Number

Package Type

Production Flow

Commercial, 0ºC to +70ºC

SG590AYB

48 PIN SSOP

Note:

The ordering part number is formed by a combination of device number, device revision, package style, and

screening as shown below.

Marking:

Example:

IMI

SG590AYB

Date Code, Lot #

SG590AYB

Flow

B = Commercial, 0ºC to + 70ºC

Package

Y = SSOP

Revision

IMI Device Number

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571

Rev 1.3

10/20/97

Page 7 of 7

SG590AYB [CYPRESS]

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