Integrated
Circuit
Systems, Inc.

General Description

Features

AV9172

Block Diagram

AV9172RevB060297P

The AV9172 is designed to generate low skew clocks for
clock distribution in high-performance PCs and workstations.
It uses phase-locked loop technology to align the phase and
frequency of the output clocks with an input reference clock.
Because the input to output skew is guaranteed to ±500ps, the
part acts as a "zero delay" buffer.

The AV9172 has six configurable outputs. The AV9172-01
version has one output that runs at the same phase and
frequency as the reference clock. A second output runs at the
same frequency as the reference, but can either be in phase or
180° out of phase from the input clock. Two outputs are
provided that are at twice the reference frequency and in
phase with the reference clock. The final outputs can be
programmed to be replicas of the 2x clocks or non-overlapping
two phase clocks at twice the reference frequency. The
AV9172-01 and AV9172-03 operates with input clocks
from 10 MHz to 50 MHz while producing outputs from
10 MHz to 100 MHz. The AV9172-07 operates with input
clocks from 20 to 100 MHz.

The use of a phase-locked loop (PLL) allows the output
clocks to run at multiples of the input clock. This permits
routing of a lower speed clock and local generation of a
required high speed clock. Synchronization of the phase
relationship between the input clock and the output clocks is
accomplished when one output clock is connected to the
input pin FBIN. The PLL circuitry matches rising edges of the
input clock and output clocks.

AV9172-07 input is 66 MHz with 66 and 33 MHz
output buffers

AV9172-01 is pin compatible with Gazelle GA1210E

±250ps skew (max) between outputs

±500ps skew (max) between input and outputs

Input frequency range from 10 MHz to 50 MHz
(-01, -03) and from 20 MHz to 100 MHz (-07)

Output frequency range from 10 MHz to 100 MHz
(-01, -03, -07)

Special mode for two-phase clock generation

Inputs and outputs are fully TTL-compatible

CMOS process results in low power supply current

High drive, 25mA outputs

Low cost

16-pin SOIC (150-mil) or 16-pin PDIP package

Low Skew Output Buffer

The AV9172 is fabricated using CMOS technology which
results in much lower power consumption and cost compared
with the gallium arsenide-based GA1210E. The typical
operating current for the AV9172 is 50mA versus 120mA for
the GA1210E.

ICS offers several versions of the AV9172. The different
devices are shown below:

PART

DESCRIPTION

AV9172-01

Second source of GA1210E

AV9172-03

Clock doubler and buffer

AV9172-07

Clock buffer for 66 MHz input

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.

AV9172

Pin Configuration

Pin Description for AV9172-01

16-Pin SOIC or 16-Pin PDIP

Functionality Table for AV9172-01

CLKIN input frequency range 10 to 50 MHz.

Notes:
1. 1X designates that the output is a replica of CLKIN.
2. 2X designates that the output is twice the frequency of
CLKIN, and in phase.
3. 1X# means that the output is at the same frequency and
180°C out of phase (inverted) from CLKIN.
4. Ø1 will produce a ¼ duty cycle clock of CLKIN.
5. Ø2 will produce a ¼ duty cycle clock delayed 180° from
CLKIN.

EN2

INV#

1X#

PIN NUMBER

PIN NAME

TYPE

DESCRIPTION

GND

GROUND.

GND

GROUND.

INV#

Input

INV# Inverts Q1 when low. (-01 [divisor select -03, -07])

Input

EN converts Q4 and Q5 to phase clocks when high.

FBIN

Input

FEEDBACK INPUT from output Q0.

CLKIN

Input

INPUT for reference clock.

VDD

Power supply (+5V).

VDD

Power supply (+5V).

GND

GROUND.

Output

Q0 phase and frequency same as input (1X). Feed back to pin 5.

Output

Q1 is a 1x clock in phase or 180° out of phase with input.

Output

Q2 twice the frequency of Q0 (2x).

Output

Q3 twice the frequency of Q0 (2x).

Output

Q4 is either a 2X clock or a two-phase clock - see configuration table.

Output

Q5 is either a 2X clock or a two-phase clock - see configuration table.

VDD

Power supply (+5V).

AV9172

Pin Configuration

Functionality Table for AV9172-03

CLKIN Input Frequency=X, input range is 10 to 50 MHz.

Example Table for AV9172-03

(33 MHz input, all frequencies in MHz.)

Timing Diagram for AV9172-03

16-Pin SOIC or 16-Pin PDIP

Note: The phase alignment between the 1X clock outputs and
reference clocks input will be either at a 0 or 180 degrees
offset if the 2X clock is used as the feedback signal (con-
nected to the FBIN pin). Which relationship occurs is totally
random and has the potential to change any time the device has
its VDD supply cycled off or the devices input clock
removed.

EN2

INV#

EN2

INV#

AV9172

Absolute Maximum Ratings

VDD referenced to GND . . . . . . . . . . . . . . . . . . . . . . 7V
Operating temperature under bias. . . . . . . . . . . . . . . . 0°C to +70°C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . -65°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.

Pin Configuration

Functionality Table for AV9172-07

CLKIN Input Frequency=X, input range is 20 to 100 MHz.

Example Table for AV9172-07

(66 MHz input, all frequencies in MHz.)

16-Pin SOIC or 16-Pin PDIP

Timing Diagram for AV9172-07

EN2

INV#

0.5X

EN2

INV#

AV9172

Electrical Characteristics

=+5V±5%, T

=0°C to 70°C unless otherwise stated

*Parameter guaranteed by design and characterization. Not 100% tested in production.

Notes:
1. Output frequency includes both the Fast Clock (2X or 1X) and the Slow Clock (1X or 0.5X) extremes.
2. All skew specifications are measured with a 50W transmission line, load terminated with 50W to 1.4V.
3. Duty cycle measured at 1.4V.
4. Skew measured at 1.4V on rising edges. Loading must be equal on outputs.

DC Characteristics

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Input Low Voltage

=5V

0.8

Input High Voltage

=5V

2.0

Input Low Current

=0V

-5

µA

Input High Current

-5

µA

Output Low Voltage

=25mA

0.5

0.8

Output High Voltage

=-25mA

2.4

Supply Current

Unloaded, 50 MHz outputs

AC Characteristics

Input Clock Rise Time

ICLK

Input Clock Fall Time

ICLK

Output Rise time, 0.8 to 2.0V

15pF load

0.7

Rise time, 20% to 80% V

15pF load

1.2

Output Fall time, 2.0 to 0.8V

15pF load

0.7

Fall time, 80% to 20% V

15pF load

1.2

Output Duty cycle

15pF load

49/51

Jitter, 1 sigma

Jitter, absolute

abs

ae200

Input Frequency (-01,-03)

MHz

Input Frequency (-07)

100

MHz

Output Frequency
(-01,-03, -07)

Note 1

100

MHz

FBIN to IN skew

skew1

Note 2, 4. Input rise time
< 3ns

-500

-300

500

FBIN to IN skew

skew1

Note 2, 4. Input rise time
< 10ns

1000

-500

1000

Skew between any 2 outputs at
same frequency

skew2

Note 2, 4

-250

±50

250

Skew between any 2 outputs at
different frequencies

Note 2, 4

500

AV9172

Ordering Information

ICS XXXX-PPP M X#W

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

Example:

16-Pin PDIP Package

16-Pin SOIC Package

Part Number

Part Marking

Temperature

Package Type

AV9172-xxCC16

AV9172-XX

0°C to 70°C

16 Lead CERDIP

AV9172-xxCN16

AV9172-XX

0°C to 70°C

16 Lead Plastic DIP (300 mil)

AV9172-xxCW16

AV9172-XX

0°C to 70°C

16 Lead SOIC (300 mil)

AV9172-xxCS16

AV9172-XX

0°C to 70°C

16 Lead SOIC (150 mil)

Lead Count & Package Width

Lead Count=1, 2 or 3 digits
W=.3" SOIC or .6" DIP; None=Standard Width

Package Type

CERDIP

N=DIP (Plastic#)

W=SOIC (300 mil)

S=SOIC (150 mil)

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