IMISG501XB [ETC]

CPU System Clock Generator ; CPU的系统时钟发生器\n


型号：	IMISG501XB
厂家：	ETC
描述：	CPU System Clock Generator CPU的系统时钟发生器\n 晶体时钟发生器外围集成电路光电二极管
文件：	总8页 (文件大小：161K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

IMISG501

SYSTEM CLOCK CHIP

PATENT PENDING

March 1996

REDUCED EMI CLOCK GENERATOR

PRODUCT FEATURES

PRODUCT DESCRIPTION

Generates CPU Clock Signals for Microprocessor

Systems

The IMISG501 is a spectrum spread clock generator

specially designed for personal computers, laser

printers and other digital systems. IMISG501 uses a

patent pending concept to generate popular clock

frequencies that are intentionally broadbanded to

reduce electromagnetic interference. IMISG501

attenuates the radiated emission amplitudes from

products associated with either the clock harmonics or

any signals derived from the clock signals nominally 10

db and could significantly reduce the cost of complying

with the regulatory requirements.

Reduces Measured EMI by 10 db nominal

4V to 7V Operating Supply Range

Supports 80286-, 80386-, 80486-, PentiumÔ - and

29000-based designs

Wide range of selectable output frequencies

including 50, 25, 20 and 10 Mhz

PRCLK is the broadbanded output and can be

programmed to generate 50, 25, 20 and 10 Mhz with

S0 and S1 pins. A single, low cost external crystal is

required as reference frequency for the synthesizer.

Output modulation function can be turned off with the

SSON pin. Several power down modes add the

flexibility to operate the device in a completely static

mode to reduce standby currents and simplify system

board tests.

single, low cost crystal used as reference

frequency

Glitch-free switching

50% duty cycle

Power down mode for low power consumption

TTL or CMOS compatible outputs with 6mA drive

capability

PDIP/SOIC CONNECTION DIAGRAM

Low, short- and long-term jitter

VDD

OSCin

OSCout

VSS

MPSEL

AVDD

TEST

VDD

MPCLK

VSS

PRCLK

AVSS

LF1

16 PDIP and 16 Pin SOIC (300 mil body) package

options

BLOCK DIAGRAM

SSON

REF

/4 OR /12

44.2 MHz

MPCLK

MPSEL

APPLICATIONS

SPECTRUM

SPREAD

CLOCK GEN

PRCLK

IMISG501 eliminates the need for multiple oscillators

and generates the CPU clock signals for personal

computers, laser printers and other digital systems.

Supports 8086-, 80286-, 80386-, 80486-, PentiumÔ -

and 29000-based designs. IMISG501 can be used with

laptop or notebook computers to save power by

running the system slower than normal CPU speeds or

completely disabling the clocks in standby mode.

TEST

SSON

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 1of 8

IMISG501

SYSTEM CLOCK CHIP

March 1996

REDUCED EMI CLOCK GENERATOR

PIN DESCRIPTION

OSCin, OSCout - These pins form an on-chip

reference oscillator when connected to terminals of an

external 44.2 Mhz third overtone parallel resonant

crystal. OSCin may also serve as an input for an

externally generated CMOS level or AC coupled

reference signal.

MPCLK - This is a nonmodulated output. This output

can be programmed to be 3.7 Mhz or 11.06 mHz. The

selection of these frequencies are controlled by the

MPSEL pin shown in Table 1.

PRCLK - Output from the spectrum spread clock

generator. Frequency selection is shown on Table 1.

When the SSON pin is high, outputs are not

modulated. When SSON is low, sprectrum spread

function is enabled.

S0, and S1 - Frequency select inputs. These inputs

control the PRCLK frequency selection. S0-S1 inputs

control the CPU clock frequencies. All these inputs

have internal pull-downs.

VSS - Circuit ground

Table 1 shows the output freuqncy selection conditions.

VDD - Positive power supply

AVSS - Analog circuit ground

AVDD - Analog positive power supply

TEST - Controls power down and Test Mode selection.

When high, S0-S1 and MPSEL controls the mode

selection as shown on Table 1 and Table 2. When low,

device operates in normal mode. This pin has an

internal pull-down.

MPSEL - Controls MPCLK output frequency selections.

Table 2 shows the selected frequencies for MPCLK.

This input has an internal pull-up.

330 pf

SSON - This pin controls the sprectrum spread

function. When low, PRCLK is modulated. When high,

spreading is turned off. This pin has an internal pull-up.

2200 pf

LF1 - This is the control output for the clock generator.

It is a single-ended, tri-state output. Component

connections are shown in Figure 1.

Figure 1

MPCLK FREQUENCY SELECTION

PRCLK FREQUENCY SELECTION

Inputs

TEST MPSEL

Output

PRCLK

3.7 Mhz

Inputs

Output

TEST

PRCLK

9.96 Mhz

11.06 MHz

0; Power Down

1; Power Down

TEST

19.92 Mhz

24.9 Mhz

49.80 Mhz

0; Power Down

1; Power Down

TEST

Hi-Z

TABLE 2: When Power Down address is selected, the

VCO is turned off and the device goes to standby

mode. Phase detector is in tri-state mode.

Hi-Z

TABLE 1: When Power Down address is slected, the

VCO is turned off and the device goes to standby

mode. Phase detector is in tri-state mode.

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 2 of 8

IMISG501

SYSTEM CLOCK CHIP

March 1996

REDUCED EMI CLOCK GENERATOR

MAXIMUM RATINGS

This device contains circuitry to protect the inputs

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:

Voltage Relative to VSS:

Voltage Relative to VDD:

Storage Temperature:

-0.3V to 7V

0.3V

-65°C to 150°C

-0°C to 70°C

4.5-5.5V

Ambient Temperature:

Recommend Operating Range:

VSS< (Vin or Vout) < VDD

All inputs are tied high or low internally.

ELECTRICAL CHARACTERISTICS

Characteristic

Symbol

Min

Typ

Max

0.8

Units

Vdc

Input Low Voltage

VIL

Input High Voltage

VIH

IIL/IIH

VOL

VOH

IOZ

2.0

10/100

0.4

Vdc

Input Low Current with Pull-up/ Pull-down

Output Low Voltage IOL = 6mA

Output High Voltage IOH=6mA

Tri-State leakage Current

Static Supply Current

Vdc

2.5

IDD

250

Dynamic Supply Current

Short Circuit Current

ICC

ISC

VDD = 5V + 10%, TA = 0°C to 70°C

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 3 of 8

IMISG501

SYSTEM CLOCK CHIP

March 1996

REDUCED EMI CLOCK GENERATOR

SWITCHING CHARACTERISTICS

Characteristic

Symbol

Min

Typ

Max

Units

Output Rise and Fall Time Measured at 10% - 90% of

VDD

tTLH, tTHL

Output Rise and Fall Time Measured at 0.8V - 2.0V

Output Duty Cycles

tTLH, tTHL

TsymF1

tj1s

45/55

Jitter One Sigma

% of Fout

Cycle-to-Cycle Jitter with Normal Crystal

tjcc

VDD = 5 + 10%, TA = 0°C to 70°C, CL = 15 pF

OSCILLATOR CHARACTERISTICS

Characteristic

Symbol

Min

Typ

Max

Units

Millimho

Conditions

Transconductance

180

@ 44.2 Mhz

Output Impedance

Input Capacitance

Output Capacitance

DC Bias Voltage

Start-up Time

200

800

ohms

@ 44.2 Mhz

1.5

VDD/2

3.5

Volt

@ VDD = 4.5V

Duty Cycle

TsymF1

ICLKr

45/55

Input Rise Time OSCin

VCO CHARACTERISTICS

Characteristic

VCO Gain

Symbol

Min

Typ

Max

Units

Conditions

MHz/Volt

DF/DV Measured with VCO Control at

2V - 3V

Phase Detector Gain Kd

100

145

200

mA/rad

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 4 of 8

IMISG501

SYSTEM CLOCK CHIP

March 1996

REDUCED EMI CLOCK GENERATOR

CHARTS

FREQUENCY SELECTION

SCALING FACTOR

PRCLK

REFERENCE

.225

.450

.562

1.25

Reference Range:

Output Range:

35 Mhz _MINto 55 MHZ_MAX

8 MHz_MINto 60 MHz_MAX

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 5 of 8

IMISG501

SYSTEM CLOCK CHIP

March 1996

REDUCED EMI CLOCK GENERATOR

EXTERNAL CONNECTIONS

VCC

DIGITAL POWER PLANE

ANALOG POWER PLANE

DVDD

AVDD

1.5 uH

DIGITAL GND PLANE

ANALOG GND PLANE

C11

10uf

10 Ohms

C10

22uf

DVDD

SG501

10pf

XTAL

VDD

XIN

TEST

VDD

MPCLK

VSS

PRCLK

AVSS

LF1

44.2 MHz

DVDD

.1uF

XOUT

VSS

MPSEL

AVDD

JP5

.033uF

1.2 uH

10pf

10 pf

HEADER

SSON

.1uF

AVDD

2200pf

JP1

330 pf

MPSEL

JP2

JP3

JP4

TEST

DVDD

NOTE1: KEEP C3, C4, C5, C6 CLOSE TO THEIR PINS (4, 11, 13, 10, 9 RESPECTIVELY).

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 6 of 8

IMISG501

SYSTEM CLOCK CHIP

March 1996

REDUCED EMI CLOCK GENERATOR

PACKAGE DRAWING AND DIMENSIONS

16 PIN SOIC OUTLINE DIMENSIONS

INCHES

MILLIMETERS

SYMBOL

MIN

NOM

MAX

0.104

MIN

2.46

NOM

2.56

MAX

0.097

0.101

2.64

0.38

2.39

0.48

0.32

10.46

7.59

A₁

0.0020

0.090

0.014

0.0091

.399

0.009

0.092

0.016

0.010

.407

0.0015

0.111

0.019

0.0125

.412

0.060

2.29

0.35

0.23

10.13

7.24

0.22

2.34

0.41

0.25

10.34

7.52

0.285

0.296

0.050 BSC

0.406

5°

0.299

A₂

1.27 BSC

10.31

5°

0.400

0°

0.410

10°

10.16

0°

10.41

10°

A₁

0.024

0.032

0.040

0.61

0.81

1.02

16-PIN PLASTIC DIP DIMENSIONS

INCHES

MILLIMETERS

SYMBOL

MIN

NOM

MAX

MIN

NOM

MAX

0.150

0.015

0.016

0.056

0.046

0.008

0.748

0.300

0.240

0.335

0.160

0.170

3.81

0.381

0.40

1.47

1.17

0.20

19.00

7.62

6.096

8.51

4.06

4.318

A₁

0.018

0.059

0.049

0.010

0.750

0.312

0.252

0.345

0.100 BSC

0.230

7°

0.020

0.062

0.052

0.012

0.752

0.325

0.260

0.355

0.45

1.52

1.24

0.25

19.05

7.924

6.49

8.76

2.54 BSC

3.30

7°

0.50

1.57

1.32

0.30

19.10

8.255

6.604

9.01

B₁

B₂

E₁

E₂

e₁

0.25

0°

0.135

15°

3.175

0°

3.429

15°

0.059

0.128

0.073

0.060

0.130

0.075

0.061

0.132

0.077

1.50

3.25

1.85

1.53

3.30

1.90

1.55

3.35

1.95

Q₁

Q₂

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 7 of 8

IMISG501

SYSTEM CLOCK CHIP

March 1996

REDUCED EMI CLOCK GENERATOR

ORDERING INFORMATION

Part Number

IMISG501xPB

IMISG501xXB

Package Type

16 Pin Plastic Dip

16 Pin SOIC

Production Flow

Commercial, 0°C to + 70°C

Commercial, 0°C to + 70C°

Note:

The “x” following the IMI Device Number denotes the device revision. The ordering part number is formed

by a combination of device number, device revision, package style, and screening as shown below.

Marking: Example:

IMI

SG501xPB

Date Code, Lot #

IMISG501xPB

Flow

B = Commercial, 0°C to + 70°C

Package

P = Plastic Dip

X = Small Outline

Revision

IMI Device Number

INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.

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

Page 8 of 8

IMISG501XB [ETC]

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