Datasheet AV9158-03CW24, ICS9158-03CW24 Datasheet (ICST)

Integrated
Circuit
Systems, Inc.

General Description Features

ICS91 58-03

Block Diagram

9158-03 Rev D 7/28/98

Applications

Frequency Generator and Integrated Buffer

The ICS9158-03 is a low-cost frequency generator designed
specifically for desktop and notebook PC applications. Eight
copies of the CPU clock are available.

Each high drive (40mA) output is capable for driving a 30pF
load and has a typical duty cycle of 50/50. The clock
outputs are skew-controlled to within ±250ps.

The ICS9158-03 makes a gradual transition between
frequencies, so that it meets the Intel cycle-to-cycle timing
specification for 486 and Pentium systems.

 8 skew-free, high drive CPU/BUS clocks
 Up to 100 MHz output
 ±250ps skew between all outputs
 Outputs can drive up to 30pF load and 40mA
 50±10% duty cycle
 Compatible with 486 and Pentium CPUs
 On-chip loop filter components
 4.5V - 5.5V supply range
 24-pin SOIC package

 Ideal for RISC or CISC systems such as 486, Pentium,

PowerPC, etc. requiring multiple CPU and BUS
clocks.

ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all
device data to verify that any information being relied upon by the customer is current
and accurate.

2

ICS9158-03

Pin Configuration

24-Pin SOIC

Functionality

(Assuming 14.318 MHz input.)
VDD=5V±10% or 3.3V±10%, TEMP=0-70°C

Peripheral Clocks

FS2 FS1 FS0

CLK2 A

(MHz )

CLK1 2(A -C)

(MHZ )

CL K1( A-D )

(MHz)
000321616
001323216
010321616
011323216
1 0 0 502525
1 0 1505025
1 1 0 66.67 33.33 33.33

1 1 1 60 60 30

OE C L K2A CL K12 (A -C) CL K12 (A -D )

40MHz

(Pin 6 )

24MHz

(Pin 7 )

REF

(Pin 1 8)

1 Runs Runs Runs 39.92 23.95 14.31818
0 TristateTristateTristateTristateTristateTristate

3

ICS9158-03

Pin Descriptions for ICS9158-03

PIN NUMBER PIN NAME TYPE DESCRIPTION

1 CLK1A OUT CLK1A clock output

2 X2 OUT Crystal connection
3 X1 IN Crystal connection
4 VDD PWR Digital POWER SUP PLY (+5V)
5 GND PWR Digital GROUND
6 40 M Hz OUT 40 M Hz clock output
7 24 M Hz OUT 24 M Hz floppy disk/combination I/O clock output
8 CLK1B OU T CLK1B clock output

9 AGND PW R ANALOG GROUND
10 OE IN OUTPUT ENABLE. Tristates all outputs when low.
11 CL K12B OUT CLK 12B clock output
12 GND PWR Digital GROUND
13 CLK 1C OUT CLK1C clock output
14 CLK1D OUT CLK1D clock output
15 F S2 IN CPU clock frequ ency select 2
16 AVDD PW R ANALOG power supply (+5V)
17 CLK 12A OUT CLK12A clock output
18 RE F OUT 14.31818 MHz clock output
19 GND PWR Digital GROUND
20 VDD PW R Digital POW ER SU PPLY (+5V )
21 CL K12C OU T 2X CPU clock output
22 CLK2A OUT CPU clock output
23 FS1 IN CPU clock frequency select 1
24 FS0 IN CPU clock frequency select 0

4

ICS9158-03

Electrical Characteristics at 5V

Absolute Maximum Ratings

AVDD, VDD referenced to GND . . . . . . . . . . . . . . . . 7V

Operating temperature under bias. . . . . . . . . . . . . . . . 0°C to +70°C

Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +150°C

Voltage on I/O pins referenced to GND. . . . . . . . . . . GND -0.5V to VDD +0.5V

Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 Watts

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
product reliability.

DC Characterist ics

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

Input Low Voltage V

IL 0.8 V

Input High Voltage V

IH 2.0 V

Input Low Current I

IL VIN=0V (Pull-up) -20 µA

Input High Current I

IH VIN=VDD -5 5 µA

Output Low Voltage V

OL IOL=20.0mA 0.25 0.4 V

Output High Voltag e

1

VOH IOH=-30mA 2.4 3.5 V

Output Low Cur rent

1

IOL VOL=0.8V 45 65 mA

Output High Curren t

1

IOH VOH=2.0V -55 -35 mA

Supply Current I

DD No load, 66 MHz 67 100 mA

Output Frequency Change over
Supply and Temperature

1

FD

With respect to typical
frequency

0.002 0.01 %

Short circuit current

1

ISC Each output clock 25 56 mA

Pull-up resistor value

1

RPU Input pin 680 kΩ

Input Capacitance

1

Ci Except X1, X2 8 pf

Load Capacitance

1

CL Pi ns X1, X2 20 pf

VDD = +5V±10%, TA=0°C to 70°C unless otherwise stated

Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.

5

ICS9158-03

Electrical Characteristics (

continued

)

Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.

AC Characteristi cs

PARAMET ER SYMBOL

TEST

CONDITIONS

MIN TYP MAX UNITS

Output Rise time, 0.8 to 2.0V (Note 1) t r 30pf load - 1 2.0 ns
Rise time, 20% to 80% VDD (Note 1) tr 30pf load - 2.5 3 ns
Output Fall time, 2.0 to 0.8V

1

tf 30pf load - 0. 5 2.0 ns

Fall time, 80% to 20% VDD

1

tf 30pf load - 1.5 3.0 ns

Duty cyc l e

1

dt 30pf load 45/55 48/52 55/45 %

Jitt er, one sigma

1

tj1s

As compared with
clock period

0.5 2.0 %
Jitter, absolute tjab -5 2 5 %
Jitter, absolute tjab 25-66MHz clocks -250 250 ps
Input Frequency fi 14.318 MHz

Clock skew bet we en CLK2A,
CLK1(A-D) and CLK12(A-C) outputs

Tsk -250 100 250 ps

Frequency Trans i ti o n Time

1

tft From 4 to 50 MHz 13 20 ms

VDD = +5V±10%, TA=0°C to 70°C unless otherwise stated

6

ICS9158-03

VDD = +3.3V±10%, TA=0°C to 70°C unless otherwise stated

Electrical Characteristics at 3.3V

Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.

DC Characteristics

PARAM ETER SYMBO L TEST COND ITIONS MIN TY P MAX UNITS

Input Low Voltag e V

IL 0.2 VDD V

Input High Voltage V

IH 0.7 VDD V

Input Low Curren t I

IL VIN = 0V (P ull-up) -10 µA

Input High Current I

IH VIN=VDD -5 µA

Output Low Voltage V

OL IOL=10mA 0.1VDD V

Output High Voltage

1

VOH IOH=-5mA 0.85VDD V

Output Low Current

1

IOL VOL=0.2VDD 20 30 mA

Output High Current

1

IOH VOH=0.7VDD -15 -10 mA

Supply Current I

DD No load, 66 MHz 43 70 mA

Output Frequency Change
over Supply and
Temperature

1

FD

With respect to ty pical
frequency

0.002 0.01 %

Sho rt Cir cuit C urre nt

1

ISC Each output clock 25 56 mA

Pull- up R esisto r Value

1

RPU In put pin 9 00 kW

Input Cap acitance

1

Ci Except X1, X2 8 pF

Load Capacitance

1

CL Pins X1, X 2 20 pF

AC Characteristics

PARA METER

SYMBOL TEST CONDITIONS M IN TYP M AX UNITS

Output Rise time,

0.8 to 2.0V

1

tr 30pF load - 1 2.5 ns

Rise time, 20% to 80% V

DD

1

tr 30pF load - 2.5 4.0 ns

Output Fall time, 2.0 to 0.8V

1

tf 30pF load - 0.5 2.5 ns

Fall tim e, 80 % to 2 0% V

DD

1

tf 30pF load - 1.5 4.0 ns

Duty cycle

1

dt 30pF load 40/50 44/46 50/40 %

Jitter, one sigm a

1

tj1 s

As compared with clock
period

0.5 2.0 %
Jitter, absolute

1

tjab 25%

Jitter, absolute

1

tjab 25-66 MHz clocks 300 ps

Input Frequency f

i 14.318 MH z

Clock skew window between
CLK2A, CLK1(A-D)
CPU and CLK 12(A-C) outputs

1

Tsk 100 250 ps

Frequency Transition time

1

tft From 4 to 50 M Hz 13 20 m s

7

ICS9158-03

Ordering Information

ICS9158-03CW24

Example:

ICS XXXX-PPP W

Package Type

W=(SOIC) 300mil

Pattern Number (2 or 3 digit number for parts with ROM code patterns)
Device Type (consists of 3 or 4 digit numbers)
Prefix

ICS, AV=Standard Device; GSP=Genlock Device

24 Lead SOIC

LEAD COUNT 24L
DIMENSION L 0.604

ICS reserves the right to make changes in the device data identified in this
publication without further notice. ICS advises its customers to obtain the latest
version of all device data to verify that any information being relied upon by the
customer is current and accurate.