where it can be used to multiply the input clock by
1.5X, 2X, and 3X. In an 8 pin SOIC, the MK1409
can save component count, board space, and cost
over crystals and oscillators, and increase reliability
by eliminating up to three expensive mechanical
devices from the board.
MicroClock offers many other clocks for
computers and computer peripherals. Consult
MicroClock when you need to remove crystals and
oscillators from your board.
Features
• Packaged in 8 pin SOIC
• Input clock frequency of 14.31818 MHz
• Provides USB, SIO, and keyboard clocks
• Provides USB and SCSI clocks
• Can be configured as 1.5X, 2X and 3X multiplier
• Low jitter
• 25mA drive capability at TTL levels
• 3.3V or 5V±10% supply voltage
• Advanced, low power CMOS process
Block Diagram
VDD GND
Output
Buffer
Clock Synthesis
and Control
Circuitry
ICLK
Clock
Buffer
S1
S0
CLK 1
(48 MHz)
CLK 2
(24 MHz)
CLK 3
(12, 16, or
40 MHz)
Output
Buffer
Output
Buffer
14.31818 MHz
clock
1
Revision 10016
Printed 10/31/97
MicroClock Incorporated•1171 North Fourth St.•San Jose•CA•95112•(408)295-9800tel•(408)295-9818fax
MDS1409B
PRELIMINARY INFORMATION
MK1409
Peripheral Clock Synthesizer
Pin Assignment
Clock Output Select Table (in MHz)
ICLK
VDD
GND
CLK1
1
2
3
4
8
7
6
5
CLK3
S0
S1
CLK2
S1
pin 6
0
0
1
1
1
S0
pin 7
0
1
0
1
1
Input
pin 1
14.31818
14.31818
14.31818
5 - 20
21-28
CLK1
pin 4
48
48
48
3X
3X
CLK2
pin 5
24
24
30
1.5X
1.5X
CLK3
pin 8
16
12
40
2X
2X
VDD
Allowable
3.3 or 5V
3.3 or 5V
3.3 or 5V
3.3 or 5V
5V only
8 pin SOIC
Pin Descriptions
Number
1
2
3
4
5
6
7
8
Name
ICLK
VDD
GND
CLK1
CLK2
S1
S0
CLK3
Type
I
P
P
O
O
I
I
O
Description
Connect to a 14.31818 MHz clock or input frequencies listed in the table above.
Connect to +3.3V or +5V.
Connect to ground.
Clock Output 1 per table above.
Clock Output 2 per table above.
Frequency Select 1 Input. Determines CLK outputs as per table above.
Frequency Select 0 Input. Determines CLK outputs as per table above.
Clock Output 3 per table above.
Key: I = Input, O = output, P = power supply connection
External Components
A minimum number of external components are required for proper oscillation. A decoupling capacitor of
0.1µF should be connected between VDD and GND on pins 2 and 3, and 33Ω terminating resistors may
be used on each clock output if the trace is longer than 1 inch.
2
Revision 10016
Printed 10/31/97
MicroClock Incorporated•1171 North Fourth St.•San Jose•CA•95112•(408)295-9800tel•(408)295-9818fax
MDS1409B
PRELIMINARY INFORMATION
MK1409
Peripheral Clock Synthesizer
Electrical Specifications
Parameter
Supply Voltage, VDD
Inputs
Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Operating Voltage, VDD
Input High Voltage, VIH, input clock only
Input Low Voltage, VIL, input clock only
Output High Voltage, VOH
Output High Voltage, VOH
Output Low Voltage, VOL
Operating Supply Current, IDD, 5V
Operating Supply Current, IDD, 3.3V
Input Capacitance
Actual Mean Frequency versus Target
Input Clock Frequency
Input Crystal Accuracy
Input Clock Duty Cycle
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle
Absolute Clock Period Jitter
One Sigma Clock Period Jitter
Conditions
Referenced to GND
Referenced to GND
Referenced to GND
Max of 10 seconds
-65
Note 3
Clock input
Clock input
IOH=-4mA
IOH=-25mA
IOL=25mA
No Load
No Load
S0, S1 pins
With exact clock
Note 3
Time above UDD/2
0.8 to 2.0V
2.0 to 0.8V
Time above 1.5V
3
(VDD/2)+1
VDD-0.4
2.4
0.4
20
12
7
25
5
20
14.31818
28
50
80
1.5
1.5
60
Minimum
Typical
Maximum
7
VDD+.5V
VDD+.5V
70
260
150
5.5
VDD/2
VDD/2
(VDD/2)-1
Units
V
V
V
°C
°C
°C
V
V
V
V
V
V
mA
mA
pF
ppm
MHz
ppm
%
ns
ns
%
ps
ps
ABSOLUTE MAXIMUM RATINGS (note 1)
-0.5
-0.5
0
DC CHARACTERISTICS (at 5.0V unless otherwise noted)
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
40
50
200
70
Notes:
1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure
to levels above the operating limits but below the Absolute Maximums may affect device reliability.
2. Typical values are at 25°C.
3. See the selection table on page two for allowable input clock ranges. For a high input clock, VDD can only be 5V.
3
Revision 10016
Printed 10/31/97
MicroClock Incorporated•1171 North Fourth St.•San Jose•CA•95112•(408)295-9800tel•(408)295-9818fax
MDS1409B
PRELIMINARY INFORMATION
MK1409
Peripheral Clock Synthesizer
Package Outline and Package Dimensions
8 pin SOIC
Symbol
A
b
D
E
H
e
h
Q
Inches
Min
Max
0.055 0.061
0.013 0.019
0.185 0.200
0.150 0.160
0.225 0.245
.050 BSC
0.015
0.004
0.01
Millimeters
Min
Max
1.397 1.5494
0.330
0.483
4.699
5.080
3.810
4.064
5.715
6.223
1.27 BSC
0.381
0.102
0.254
E
Pin 1
H
D
Q
e
b
c
h x 45°
A
Ordering Information
Part/Order Number
MK1409S
MK1409STR
Marking
MK1409S
MK1409S
Package
8 pin SOIC
Add tape and reel
Temperature
0-70°C
0-70°C
While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated 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 MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not
authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.
4
Revision 10016
Printed 10/31/97
MicroClock Incorporated•1171 North Fourth St.•San Jose•CA•95112•(408)295-9800tel•(408)295-9818fax
京公网安备 11010802033920号
EEWORLD
