ICS410
MDS 410 B
1
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PC P
ERIPHERAL
C
LOCK
Description
The ICS410 is a cost-effective clock synthesizer
developed to optimize component count for PC
peripheral applications. The device supports a
common, low cost 14.31818 MHz crystal using an
on-chip crystal oscillator. The device locks all output
frequencies to enhance system performance. By
supporting common PC peripheral interface
frequencies including 50 MHz ethernet, 24.576 MHz
audio, and 40/80 MHz SCSI frequencies the clock
lower chip count enhancing system cost and reliability.
The ICS410 utilizes a low pin count 8-pin SOIC
package to optimize board space.
ICS is a leader in low jitter and power consumer
application clock sources. These devices are capable
of supporting CCD, video, audio, USB, CPU, and other
peripherals.
Features
Low operating voltage of 3.3V
On-chip oscillator supports 14.31818 MHz crystal
Fixed 24.576 MHz clock
Fixed 50 MHz clock
40/80 MHz selected on rising edge of OE/LAT pin
Power consumption of 15 mA (typ) extends battery
life
Duty cycle of 45 to 55%
Packaged in 8 pin SOIC
Contact ICS for custom frequency requirements
Block Diagram
C r y s ta l
O s c illa to r
X 1
X 2
1 4 .3 1 8 1 8 M H z
fu n d a m e n ta l
c r y s ta l
A u d io /
F ire w ir e
P L L
V D D
O E /L A T
E th e rn e t
P L L
S C S I P L L
2 4 .5 7 6 M
G N D
4 0 /8 0 M
5 0 M
PC P
ERIPHERAL
C
LOCK
MDS 410 A
2
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ICS410
Pin Assignment
40/80M Frequency Selection
Pin Descriptions
External Components
A minimum number of external components are required for proper operation. A decoupling capacitors of
0.01
F should be connected between VDD and GND as close to the device as possible. A 33
series
terminating resistor may be used on each output.
Operation of OE/LAT
The 40/80M output clock is selected by a soft pull-up or pull-down on pin 3. On power up the rising edge on
OE latches in the high or low level on pin 3 which starts the appropriate frequency. An external pull-down
or pull-up resistor (10k
) on pin 3 will select an output frequency of 40 or 80 MHz respectively. Any
low-to-high transistion on OE/LAT after power up will latch the logic level on pin 3. The 24.576 MHz and
40/80 MHz are disabled and tri-stated when OE is low.
1
2
3
X 1
4
V D D
G N D
O E / L A T
2 4 . 5 7 6 M
4 0 / 8 0 M
5 0 M
8
7
6
5
X 2
8 P i n ( 1 5 0 m i l ) S O I C
Pin 3 (40/80)
Freq
0
40M
1
80M
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
X1
Input
Crystal connection. Connect to 14.31818 MHz parallel mode crystal.
2
24.576M
Output
24.576 MHz clock output. Tri-state when OE/LAT is low.
3
40/80M
Output
40M or 80M selectable clock output. Latched on rising edge of
OE.Tri-state 40/80 MHz when OE/LAT is low.
4
50M
Output
50 MHz clock output.
5
GND
Power
Connect to ground.
6
VDD
Power
Connect to voltage supply.
7
OE/LAT
Input
Output selects/disables 40/80M output.
8
X2
Input
Crystal connection. Connect to 14.31818 MHz parallel mode crystal.
PC P
ERIPHERAL
C
LOCK
MDS 410 A
3
Revision 021202
I n t e g r a t e d C i r c u i t S y s t e m s
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5 2 5 R a c e St r e e t , S a n J o s e , C A 9 5 1 2 6
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ICS410
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS410. These ratings, which
are standard values for ICS commercially rated parts, are stress ratings only. 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 can
affect product reliability. Electrical parameters are guaranteed only over the recommended operating
temperature range.
Recommended Operation Conditions
DC Electrical Characteristics
VDD=3.3V
10%
Notes: 1. Nominal switching threshold is VDD/2
Item
Rating
Supply Voltage, VDD
7 V
All Inputs and Outputs
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
0 to +70
C
Storage Temperature
-65 to +150
C
Junction Temperature
175
C
Soldering Temperature
260
C
Parameter
Min.
Typ.
Max.
Units
Ambient Operating Temperature
0
+70
C
Power Supply Voltage (measured in respect to GND)
+3.00
+3.60
V
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Operating Voltage
VDD
3.0
3.6
V
Input High Voltage
V
IH
Note 1
2.0
V
Input Low Voltage
V
IL
Note 1
0.8
V
Output High Voltage
V
OH
I
OH
= -25 mA
2.4
V
Output Low Voltage
V
OL
I
OL
= 25 mA
0.8
V
Operating Supply Current
IDD
No load, 3 Out
15
mA
Short Circuit Current
I
OS
Each output
80
mA
PC P
ERIPHERAL
C
LOCK
MDS 410 A
4
Revision 021202
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ICS410
AC Electrical Characteristics
VDD = 3.3V 10%
, Ambient Temperature 0 to +70
C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Input Frequency
14.318
MHz
Output Rise Time
t
OR
0.8 to 2.0 V, C
L
=15 pF
1.75
ns
Output Fall Time
t
OF
2.0 to 0.8 V, C
L
=15 pF
1.75
ns
Output Clock Duty Cycle
at VDD/2
45
50
55
%
Absolute Jitter, Short Term
variation from mean
250
ps
One Sigma Jitter
85
ps
PC P
ERIPHERAL
C
LOCK
MDS 410 A
5
Revision 021202
I n t e g r a t e d C i r c u i t S y s t e m s
l
5 2 5 R a c e St r e e t , S a n J o s e , C A 9 5 1 2 6
l
t e l ( 4 0 8 ) 2 9 5 - 9 8 0 0
l
w w w. i c s t . c o m
ICS410
Package Outline and Package Dimensions
(8 pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Ordering Information
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.
Part / Order Number
Marking
Shipping
Packaging
Package
Temperature
ICS410M
ICS410
Tubes
8 pin SOIC
0 to 70
C
ICS410MT
ICS410
Tape and Reel
8 pin SOIC
0 to 70
C
D
E
H
c
h x 4 5
0
b
e
Q
A
P in 1
In d e x
A r e a
Millimeters
Inches
Symbol
Min
Max
Min
Max
A
1.35
1.75
0.0532
0.0688
A1
1.10
0.25
0.0040
0.0098
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.0075
0.0098
D
4.80
5.00
.1890
.1968
E
3.80
4.00
0.1497
0.1574
e
1.27 Basic
0.050 Basic
H
5.80
6.20
0.2284
0.2440
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
a
0
8
0
8
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