Integrated
Circuit
Systems, Inc.
AV9154A-60
OPTi Notebook Frequency Generator
General Description
The
AV9154A-60
is a low cost frequency generator designed
for general purpose PC and disk drive applications. Its CPU
clocks provide all necessary frequencies for 286, 386 and
486 systems, including support for the latest speeds of
processors. The standard devices use a 14.318 MHz crystal to
generate the CPU and peripheral clocks for integrated desktop
and notebook motherboards.
The
AV9154A-60
is specifically designed for use with OPTi
core logic chip sets.
The
AV9154A-60
can operate at 5.0V±10% or 3.3V±10%,
but the CPU frequencies are limited (see the asterisks on the
selection tables on page three) during 3.3V operation. The
parts have two power-down pins. One shuts off the CPU clock
to a low state when the power-down pin is taken high, and the
other turns off the 14.318 MHz output in the same manner.
Features
•
•
•
•
•
•
Compatible with 286, 386, and 486 CPUs
Up to 66.6 MHz (-60) CPU clocks
All loop filter components internal
3.3V and 5V operation
16-pin 150-mil SOIC
Power-down control of CPU clock
Applications
Computer Motherboards: The
AV9154A-60
replaces crystals
and oscillators, saving board space, component cost, part
count and inventory costs. It produces switchable CPU clock
and up to four fixed clocks to drive floppy disk,
communications, super I/O, bus and/or keyboard devices. The
small package and 3.3V operation is perfect for handheld
computers.
Block Diagram
AV9154A-60RevB 05/30/97P
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.
AV9154A-60
Pin Configuration
Functionality
(in MHz, assuming 14.318 MHz input)
FS2
0
0
0
0
1
1
1
1
FS1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
CPUCLK
8
16
20
25
33.33
40
50
66.66
16-Pin SOIC
Actual Output Frequencies
(in MHz, assuming 14.318 MHz input)
FS2
0
0
0
0
1
1
1
1
FS1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
CPUCLK
8.182
16.11
20.05
25.06
33.24
40.09
50.11
66.48
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PIN NAME
FS0
X2
X1
VDD
GND
24 Mhz
128 kHz
AGND
PD14
PDCPUCLK
14.318 Mhz
GND
VDD
CPUCLK
FS2
FS1
TYPE
I
O
I
P
P
O
O
P
I
I
O
P
P
O
I
I
DESCRIPTION
Frequency Select 0 for CPUCLK.
Crystal out. Connect a 14.318 MHz crystal to this pin.
Crystal in. Connect a 14.318 MHz crystal to this pin.
Digital Power (+3.3V or +5V).
Digital Ground.
24 MHz clock output.*
128 kHz clock output.*
Analog Ground.
Power-down 14.318 MHz output (active high).
Power-down CPU clock (active high).
14.318 MHz reference clock output.*
Digital Ground.
Digital Power (+3.3V or +5V).
CPU Clock output determined by status of FS0 - FS2.
Frequency Select 2 for CPUCLK.
Frequency Select 1 for CPUCLK.
Note:
No internal pull-ups on any Inputs.
* Frequencies shown are assuming a 14.318 MHz input.
2
AV9154A-60
Absolute Maximum Ratings
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.
Electrical Characteristics at 5V
V
DD
=+5V±10%, T
A
=0°C to 70°C unless otherwise stated
DC Characteristics
PARAMETER
Input Low Voltage
Input High Voltage
Input Low Current
Input High Current
Output Low Voltage
Output High Voltage
Output Low Current
Output High Current
Supply Current
Output Frequency Change over
Supply and Temperature
1
Short circuit current
Input Capacitance
Load Capacitance
1
1
1
1
1
1
1
SYMBOL
V
IL
V
IH
I
IL
I
IH
V
OL
V
OH
I
OL
I
OH
I
DD
F
D
I
SC
C
i
C
L
I
DDSTBY
TEST CONDITIONS
V
DD
=5V
V
DD
=5V
V
IN
=0V
V
IN
=V
DD
I
OL
=10mA
I
OH
=-30mA
V
OL
=0.8V
V
OH
=2.4V
No load
2
MIN
-
2.0
-
-
-
2.4
15
-
-
-
25
-
-
-
TYP
-
-
-
-
0.15
3.7
32
-48
25
0.002
40
-
20
20
MAX
0.8
-
-5
5
0.4
-
-
-30
50
0.01
-
10
-
-
UNITS
V
V
µA
µA
V
V
mA
mA
mA
%
mA
pF
pF
mA
With respect to typical
frequency
Each output clock
Except X1, X2
Pins X1, X2
When powered-down
Supply Current, lowest
Note:
1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
2. All clocks on AV9154A-60 running at highest possible frequencies.
3
AV9154A-60
Electrical Characteristics at 5V
V
DD
=+5V±10%, T
A
=0°C to 70°C unless otherwise stated
AC Characteristics
PARAMETER
Input Clock Rise time
1
Input Clock Fall time
Output Rise time
1
Rise time
1
Output Fall time
Fall time
1
1
1
SYMBOL
t
ICr
t
ICf
t
r
t
r
t
f
t
f
d
t
d
t
T
jls
T
jab
T
jab
f
i
1
TEST CONDITIONS
MIN
TYP
MAX
20
20
UNITS
ns
ns
ns
ns
ns
ns
%
%
%
%
ps
MHz
ms
ms
15pF load, 0.8 to 2.0V
15pF load, 20% to 80% V
DD
15pF load, 2.0 to 0.8V
15pF load, 80% to 20% V
DD
15pF load
15pF load
As compared with clock
period
16-80 MHz clocks
-
-
-
-
40/60
40/60
1
2
1
2
48/52
43/57
±0.8
±2
14.318
2
4
2
4
60/40
60/40
±2.5
±5
700
Duty cycle
1
Duty cycle, reference clock
1
Jitter, one sigma
Jitter, absolute
1
1
Jitter, absolute
1
Input Frequency
1
Frequency Transition time
Power-up time
1
t
ft
t
pu
From 16 to 80 MHz
From off to 50 MHz
15
15
20
Note:
1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
4
AV9154A-60
Electrical Characteristics at 3.3V
Operating V
DD
=+3.0V to +3.7V, T
A
=0°C to 70°C unless otherwise stated
DC Characteristics
PARAMETER
Input Low Voltage
Input High Voltage
Input Low Current
Input High Current
Output Low Voltage
Supply Current
Output Low Current
1
1
SYMBOL
V
IL
V
IH
I
IL
I
IH
V
OL
V
OH
I
DD
I
OL
I
OH
F
d
C
i
C
L
I
DDL
I
SC
TEST CONDITIONS
MIN
-
0.7V
DD
TYP
-
-
-
-
0.05V
DD
0.94V
DD
15
22
-11
0.002
-
20
14
30
MAX
0.2V
DD
-
5
5
0.1V
DD
-
27
-
-6.5
0.01
10
-
-
-
UNITS
V
V
µA
µA
V
V
mA
mA
mA
%
pF
pF
mA
mA
V
IN
=0V
V
IN
=V
DD
I
OL
=6mA
I
OH
=-4mA
Note 2, no load
VOL=0.2V
DD
VOH=0.7V
DD
With respect to typical
frequency
Except X1, X2
Pins X1, X2
When powered-down
-5
-5
-
0.85V
DD
-
12
-
-
-
-
-
-
Output High Voltage
1
Output High Current
1
Output Frequency Change over
Supply and Temperature
1
Input Capacitance
1
Load Capacitance
1
Supply Current, lowest
Short Circuit Current
1
Note:
1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
2. All clocks on AV9154A-60 running at highest possible frequencies.
5
