Datasheet ICS570BIT, ICS570BT, ICS570B, ICS570BI Datasheet (ICST)

PRELIMINARY INFORMATION

outputs).

• Low skew (100 ps) outputs.

• Ability to choose between 14 different
multipliers from 0.5X to 32X.

• Input clock frequency up to 150 MHz at 3.3V.

• Can recover degraded input clock duty cycle.

• Output clock duty cycle of 45/55.

• Power Down and Tri-State Mode.

• Full CMOS clock swings with 25mA drive
capability at TTL levels.

• Advanced, low power CMOS process.

• Operating voltage of 3.3 V (±5%).

• Industrial temperature version available

Multiplier and Zero Delay Buffer

Description Features

ICS570B

The ICS570B is a high performance Zero Delay Buffer
(ZDB) which integrates ICS’ proprietary analog/digital
Phase Locked Loop (PLL) techniques. The ICS570B,
part of ICS’ ClockBlocks™ family, was designed as a
performance upgrade to meet today’s higher speed and
lower voltage requirements. The zero delay feature
means that the rising edge of the input clock aligns with
the rising edges of both outputs, giving the appearance
of no delay through the device. There are two outputs on
the chip, one being a low-skew divide by two of the other.
The device incorporates an all-chip power down/tri-state
mode that stops the internal PLL and puts both outputs
into a high impedance state.

The ICS570B is ideal for synchronizing outputs in a large
variety of systems, from personal computers to data
communications to graphics/video. By allowing off-chip
feedback paths, the device can eliminate the delay
through other devices.

The ICS570B was done to improve input to output jitter
from the original ICS570M and ICS570A verisons, and is
recommended for all new 3.3 V only designs.

For 5V applications, use the ICS570A.

• Packaged in 8 pin SOIC.

• Pin-for-pin replacement and upgrade to
ICS570/ICS570A

• Functional equivalent to AV9170 (not a pin­ for-pin replacement).

• Low input to output skew of 300 ps max (>60 MHz

Block Diagram

ICLK

S1, S0

FBIN

MDS 570B A 1 Revision 053001
Integrated Circuit Systems, Inc . • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

2

divide by N

External feedback can come from CLK or CLK/2 (see table on page 2).

Phase

Detector,

Charge
Pump, and
Loop Filter

Voltage

Controlled

Oscillator

÷2

Output

Buffer

Output

Buffer

CLK

CLK/2

PRELIMINARY INFORMATION

FBIN from CLK

FBIN from CLK/2

Power Down and Tri-State

Multiplier and Zero Delay Buffer

ICS570B

Pin Assignment

VDD
GND

ICLK

Clock Multiplier Decoding Table
(Multiplies input clock by shown amount)

S1 S0 CLK CLK/2 CLK CLK/2 FB from CLK/2 * FB from CLK/2 *

#1 #6 pin # 7 pin # 8 pin # 7 pin # 8 (3.3V, MHz) (3.3V, MHz)

0 0
0 M x3 x1.5 x6 x3 2.5 to 25 3 to 25

0 1 x4 x2 x8 x4 2.5 to 19 2.5 to 19
M 0 x8 x4 x16 x8 2.5 to 9.5 2.5 to 9.5
M M x6 x3 x12 x6 2.5 to 12.5 2.5 to 12.5
M 1 x10 x5 x20 x10 2.5 to 7.5 2.5 to 7.5

1 0 x1 ÷2 x2 x1 5 to 75 8 to 75

1 M x16 x8 x32 x16 2.5 to 5 2.5 to 5

1 1 x2 x1 x4 x2 2.5 to 37.5 4.5 to 37.5

0 = connect directly to ground.
M = leave unconnected (self-biases to VDD/2).
1 = connect directly to VDD.
*Input range with CLK feedback is double that for CLK/2.

1 8

S1

2
3
4

8 pin 150 mil SOIC

CLK/2

7

CLK

6

S0

5

FBIN

25°C ICLK Input Range 85°C ICLK Input Range

- -

Pin Descriptions

Number Name Type Description

1 S1 I Select 1 for output clock. Connect to GND, VDD, or float per decoding table above.
2 VDD P Connect to +3.3V.
3 GND P Connect to ground.
4 ICLK CI Reference clock input.
5 FBIN CI Feedback clock input.
6 S0 I Select 0 for output clock. Connect to GND, VDD, or float per decoding table above.
7 CLK O Clock output per table above.
8 CLK/2 O Clock output per table above. Low skew divide by two of pin 7 clock.

Key: CI = clock input, I = input, O = output, P = power supply connection

External Components

The ICS570B requires a 0.01 µF decoupling capacitor to be connected between VDD and GND. It must be
connected close to the ICS570B to minimize lead inductance. No external power supply filtering is required for this
device. A 27 Ω series terminating resistor can be used next to each output pin.

MDS 570B A 2 Revision 053001
Integrated Circuit Systems, Inc . • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

PRELIMINARY INFORMATION

ABSOLUTE MAXIMUM RATINGS (Note 1)

DC CHARACTERISTICS (VDD = 3.3V)

AC CHARACTERISTICS (VDD = 3.3V)

ICS570B

Multiplier and Zero Delay Buffer

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 ICS570B 0 70 °C

ICS570BI -40 85 °C
Soldering Temperature Max of 10 seconds 260 °C
Storage temperature -65 150 °C

Operating Voltage, VDD 3.15 3.45 V
Input High Voltage, VIH ICLK, FBIN 2 V
Input Low Voltage, VIL ICLK, FBIN 0.8 V
Input High Voltage, VIH S0, S1 VDD-0.5 V
Input High Voltage, VIM (mid-level) S0, S1 VDD/2 V
Input Low Voltage, VIL S0, S1 0.5 V
Output High Voltage, VOH, CMOS level IOH=-4mA VDD-0.4 V
Output High Voltage, VOH IOH=-12mA 2.4 V
Output Low Voltage, VOL IOL=12mA 0.4 V
IDD Operating Supply Current, 50 in, 100 out No Load, 3.3V 16 mA
Short Circuit Current Each Output ±100 mA
Input Capacitance, S1, S0 5 pF

Input Frequency, ICLK (see table on page 2) FBIN from CLK/2
Output Clock Frequency, CLK 10 150 MHz
Output to output skew Note 2 100 175 ps
Input to Output Jitter 40-150 MHz 100-250 ps
Input skew, ICLK to FBIN Note 2 CLK>30MHz -300 300 ps
Input skew, ICLK to FBIN Note 2 VDD=3.3V, CLK<10MHz -600 600 ps
Output Clock Rise Time, 3.3V 0.8 to 2.0V, note 3 0.75 ns
Output Clock Fall Time, 3.3V 2.0 to 0.8V, note 3 0.75 ns
Output Clock Duty Cycle at VDD/2 45 49 to 51 55 %

Notes 1. Stresses beyond these can permanently damage the device

2. Assumes clocks with same rise time, measured from rising edges at VDD/2.

3. With 27 Ω terminating resistor and 15 pF loads.

MDS 570B A 3 Revision 053001
Integrated Circuit Systems, Inc . • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

PRELIMINARY INFORMATION

CLK = 50M

CLK/2 = 25M

Multiplier

CLK = 100M

CLK/2 = 50M

Multiplier

CLK = 150M

CLK/2 = 75M

Multiplier

ICS570B

Multiplier and Zero Delay Buffer

Clock Period Jitter Tables

All jitter values are considered typical measured at 25°C with 27Ω series termination resistor and 15pF loads on
both CLK and CLK2. The feedback is from CLK2 to FBIN. Note that if an output is unused, it should be left
unconnected to improve output jitter on the active output clocks.

Absolute and One Sigma Jitter (ps), VDD = 3.3V

CLKIN

S1 S0 (MHz)

0 M 8.333 6x ±110 80 3x ±55 20

0 1 6.25 8x ±125 90 4x ±50 20
M 0 3.125 16x ±130 90 8x ±55 20
M M 4.167 12x ±120 90 6x ±55 20
M 1 2.5 20x ±115 90 10x ±55 20

1 0 25 2x ±130 50 1x ±55 20

1 M 1.5625 32x ±120 90 16x ±55 20

1 1 12.5 4x ±120 60 2x ±55 20

Absolute 1 sigma Multiplier Absolute 1 sigma

Absolute and One Sigma Jitter (ps), VDD = 3.3V

CLKIN

S1 S0 (MHz)

0 M 16.667 6x ±100 70 3x ±45 20

0 1 12.5 8x ±100 70 4x ±45 20
M 0 6.25 16x ±110 80 8x ±45 20
M M 8.333 12x ±100 70 6x ±45 20
M 1 5 20x ±105 70 10x ±40 20

1 0 50 2x ±90 60 1x ±40 20

1 M 3.125 32x ±95 70 16x ±45 20

1 1 25 4x ±105 70 2x ±60 30

Absolute 1 sigma Multiplier Absolute 1 sigma

Absolute and One Sigma Jitter (ps), VDD = 3.3V

CLKIN

S1 S0 (MHz)

0 M 25 6x ±115 70 3x ±50 20

0 1 18.375 8x ±120 80 4x ±50 20
M 0 9.375 16x ±130 90 8x ±50 20
M M 12.5 12x ±130 90 6x ±45 20
M 1 7.5 20x ±130 90 10x ±45 20

1 0 75 2x ±115 90 1x ±45 20

1 M 4.6875 32x ±130 90 16x ±50 20

1 1 37.5 4x ±110 70 2x ±60 20

Absolute 1 sigma Multiplier Absolute 1 sigma

MDS 570B A 4 Revision 053001
Integrated Circuit Systems, Inc . • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

Recommended Circuit:

PRELIMINARY INFORMATION

ICS570B

Multiplier and Zero Delay Buffer

ICLK

CLK

CLK/2

VDD
GND

INPUT

S1

FBIN

x2 Mode (S1, S0 = 1, 1)

CLK Feedback

CLK

CLK/2

S0

ICK

CLK

CLK/2

x2 Mode (S1, S0 = 1, 0)

CLK/2 Feedback

Using CLK as the feedback will always result in synchronized rising edges between ICLK and CLK. However, the CLK/2
could be a falling edge compared with ICLK. Therefore, whenever possible, we recommend the use of CLK/2 feedback.
This will synchronize the rising edges of all 3 clocks.

MDS 570B A 5 Revision 053001
Integrated Circuit Systems, Inc . • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

PRELIMINARY INFORMATION

Inches

Millimeters

Multiplier and Zero Delay Buffer

Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC Publication No. 95.)

8 pin (150 mil) SOIC

Symbol Min Max Min Max

A 0.0532 0.0688 1.35 1.75

A1 0.004 0.0098 0.10 0.25

E H

INDEX

AREA

h x 45°

D

B 0.0130 0.0200 0.33 0.51
C 0.0075 0.0098 0.19 0.25
D 0.1890 0.1968 4.80 5.00
E 0.1497 0.1574 3.80 4.00

e

H 0.2284 0.2440 5.80 6.20

h 0.0099 0.0195 0.25 0.50
L 0.0160 0.0500 0.41 1.27

ICS570B

A1 C

e

B

A

L

Ordering Information

Part/Order Number Marking Package/Comments Temperature

ICS570B ICS570B 8 pin SOIC 0 to 70 °C

ICS570BT ICS570B 8 pin SOIC on tape and reel 0 to 70 °C

ICS570BI ICS570BI 8 pin SOIC -40 to +85 °C

ICS570BIT ICS570BI 8 pin SOIC on tape and reel -40 to +85 °C

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) 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. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS
product for use in life support devices or critical medical instruments.

ClockBlocks is a trademark of ICS

MDS 570B A 6 Revision 053001
Integrated Circuit Systems, Inc . • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com