Datasheet ICS502MIT, ICS502MT, ICS502M, ICS502MI Datasheet (ICST)

ICS502

LOCO™ PLL Clock Multiplier

Description

The ICS502 LOCO™ is the most cost effective
way to generate a high quality, high frequency
clock output and a reference from a low frequency
crystal or clock input. The name LOCO stands for
LOw Cost Oscillator, as it is designed to replace
crystal oscillators in most electronic systems. Using
Phase-Locked-Loop (PLL) techniques, the device
uses a standard fundamental mode, inexpensive
crystal to produce output clocks up to 160 MHz.

Stored in the chip’s ROM is the ability to generate
6 different multiplication factors, allowing one
chip to output many common frequencies (see
page 2).

Features

• Packaged as 8 pin SOIC or die

• ICS’ lowest cost PLL clock plus reference

• Zero ppm multiplication error

• Easy to cascade with other 5xx series

• Input crystal frequency of 5 - 27 MHz

• Input clock frequency of 2 - 50 MHz

• Output clock frequencies up to 160 MHz

• Low jitter - 50 ps one sigma

• Compatible with all popular CPUs

• Duty cycle of 45/55 up to 160 MHz

• Operating voltages of 3.0 to 5.5V

• Industrial temperature version available

• 25mA drive capability at TTL levels

• Advanced, low power CMOS process

Block Diagram

S1, S0

crystal
or clock

X1/ICLK

X2

VDD GND

2

Crystal

Oscillator

PLL

Clock

Synthesis

and Control

Circuitry

Output

Buffer

Output

Buffer

CLK

REF

MDS 502 D 1 Revision 111000

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•[phone]tel • www.icst.com

ICS502

LOCO™ PLL Clock Multiplier

Pin Assignment

X1/ICLK

VDD
GND

REF

1 8

2
3
4

X2

7

S1

6

S0

5

CLK

Clock Decoding Table (MHz)

S1 S0 CLK

0 0 x2

0 1 x5
M 0 x3
M 1 x3.33

1 0 x4

1 1 x2.5

Minimum input frequency for all
selections is per table on page 3.

0 = connect directly to ground.
1 = connect directly to VDD.
M = leave unconnected (floating).

Common Output Frequencies Examples (MHz)

Output 20 25 30 32 33.33 37.5 40 48 50 54 60
Input 10 10 10 16 10 15 20 16 20 13.5 20
Selection (S1, S0) 0, 0 1, 1 M, 0 0, 0 M, 1 1, 1 0, 0 M, 0 1, 1 1, 0 M, 0

Output 64 66.66 72 75 80 81 90 100 108 120 135
Input 16 20 24 15 20 27 27 20 27 24 27
Selection (S1, S0) 1, 0 M, 1 M, 0 0, 1 1, 0 M, 0 M, 1 0, 1 1, 0 0, 1 0, 1

Note that all of the above outputs are achieved by using an inexpensive 10MHz to 27MHz crystal.
Consult MicroClock/ICS on how to achieve other output frequencies.

Pin Descriptions

Number Name Type Description

1 X1/ICLK I Crystal connection or clock input.
2 VDD P Connect to +3.3V or +5V.
3 GND P Connect to ground.
4 REF O Buffered crystal oscillator output clock.
5 CLK O Clock output per Table above.
6 S0 I Select 0 for output clock. Connect to GND or VDD.
7 S1 TI Select 1 for output clock. Connect to GND or VDD or float.
8 X2 O Crystal connection. Leave unconnected for clock input.

Key: I = Input, TI = Tri-Level Input, O = output, P = power supply connection

MDS 502 D 2 Revision 111000

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•[phone]tel • www.icst.com

ICS502

ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)

DC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)

AC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)

LOCO™ PLL Clock Multiplier

Electrical Specifications

Parameter Conditions Minimum Typical Maximum Units

Supply Voltage, VDD Referenced to GND 7 V
Inputs Referenced to GND -0.5 VDD+0.5 V
Clock Output Referenced to GND -0.5 VDD+0.5 V
Ambient Operating Temperature 0 70 C

ICS502MI only -40 85 C
Soldering Temperature Max of 10 seconds 260 C
Storage temperature -65 150 C

Operating Voltage, VDD 3 5.5 V
Input High Voltage, VIH, ICLK only ICLK (Pin 1) (VDD/2)+1 VDD/2 V
Input Low Voltage, VIL, ICLK only ICLK (Pin 1) VDD/2 (VDD/2)-1 V
Input High Voltage, VIH S0 2 V
Input Low Voltage, VIL S0 0.8 V
Input High Voltage, VIH S1 VDD-0.5 V
Input Low Voltage, VIL S1 0.5 V
Output High Voltage, VOH IOH=-25mA 2.4 V
Output Low Voltage, VOL IOL=25mA 0.4 V
IDD Operating Supply Current, 20 MHz crystal No Load, 100MHz 20 mA
Short Circuit Current CLK output ±70 mA
On-Chip Pull-up Resistor Pin 6 270 kΩ
Input Capacitance, S1, S0 Pins 6, 7 4 pF

Input Frequency, crystal input 5 27 MHz
Input Frequency, clock input 2 50 MHz
Output Frequency, VDD = 4.5 to 5.5V 0 C to +70 C 14 160 MHz

-40 C to +85 C 14 140 MHz

Output Frequency, VDD = 3.0 to 3.6V 0 C to +70 C 14 100 MHz

-40 C to +85 C 14 90 MHz
Output Clock Rise Time 0.8 to 2.0V 1 ns
Output Clock Fall Time 2.0 to 0.8V 1 ns
Output Clock Duty Cycle at VDD/2 45 49 to 51 55 %
Absolute Clock Period Jitter Deviation from mean ±120 ps
One Sigma Clock Period Jitter 50 ps

MDS 502 D 3 Revision 111000

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•[phone]tel • www.icst.com

ICS502

Inches

Millimeters

LOCO™ PLL Clock Multiplier

External Components / Crystal Selection

The ICS502 requires a 0.01µF decoupling capacitor to be connected between VDD and GND. It must be
connected close to the ICS502 to minimize lead inductance. No external power supply filtering is required
for this device. A 33Ω terminating resistor can be used next to the CLK pin. The total on-chip capacitance
is approximately 13 pF, so a parallel resonant, fundamental mode crystal should be used. For crystals with
a specified load capacitance greater than 13 pF, crystal capacitors should be connected from each of the
pins X1 and X2 to Ground as shown in the Block Diagram on page 1. The value (in pF) of these crystal
caps should be = (CL-13)*2, where CL is the crystal load capacitance in pF. These external capacitors are

only required for applications where the exact frequency is critical. For a clock input, connect to X1 and
leave X2 unconnected (no capacitors on either).

Package Outline and Package Dimensions

8 pin SOIC

E H

Q

Pin 1

e

D

h x 45°

A

c

b

Symbol Min Max Min Max

A 0.055 0.068 1.397 1.7272
b 0.013 0.019 0.330 0.483

D 0.185 0.200 4.699 5.080

E 0.150 0.160 3.810 4.064

H 0.225 0.245 5.715 6.223

e

h 0.015 0.381

Q 0.004 0.01 0.102 0.254

Ordering Information

Part/Order Number Marking Package Temperature

ICS502M ICS502M 8 pin SOIC 0 to 70 C

ICS502MT ICS502M 8 pin SOIC on tape and reel 0 to 70 C

ICS502MI ICS502I 8 pin SOIC -40 to +85 C

ICS502MIT ICS502I 8 pin SOIC on tape and reel -40 to +85 C

While the information presented herein has been checked for both accuracy and reliability, ICS/MicroClock assumes no responsibility for either its use or for the infringement of
any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal
commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not
recommended without additional processing by ICS/MicroClock. ICS/MicroClock reserves the right to change any circuitry or specifications without notice. ICS/MicroClock
does not authorize or warrant any ICS/MicroClock product for use in life support devices or critical medical instruments.

MDS 502 D 4 Revision 111000

LOCO is a trademark of ICS

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•[phone]tel • www.icst.com