MK1422
OPL3/4+Codec Portable Clock Source
MDS 1422 B
1
Revision 080698
Printed 11/15/00
Integrated Circuit Systems525 Race StreetSan JoseCA95126(408)295-9800telwww.icst.com
The MK1422 is the ideal way to generate clocks
for sound in portable computers. It provides clocks
for Analog Devices' or Crystal Semiconductor's
stereo codecs, and Yamaha's OPL3L, OPL3LS,
and OPL4. The MK1422 uses either a
14.318 MHz crystal, or a 14.318 MHz bus clock
input to synthesize the clocks required to drive the
codec, and the 33.868 MHz required for the FM
or wavetable music synthesizer. It includes a power
down pin to save power without using a FET. In an
8 pin SOIC, the MK1422 can save component
count, board space, and cost over surface mount
crystals, and increase reliability by eliminating
three mechanical devices from the board.
MicroClock offers many other parts with stereo
codec support. MicroClock invented sound clocks,
and has the widest product offering and greatest
production experience on these devices. The
MK1422 is pin compatible with MicroClock's
popular MK1420 when the 14.318MHz clock
output is not used. See the MK14223 for 3.3V.
Block Diagram
Description
Features
VDD GND
Clock Synthesis
Circuitry
16.934 MHz
Output
Buffer
Output
Buffer
24.576 MHz
Packaged in 8 pin SOIC
Input crystal or clock frequency of 14.318 MHz
Output clock frequencies of 16.934 MHz,
24.576 MHz, and 33.868 MHz
25mA drive capability at TTL levels
Advanced, low power CMOS process
Low jitter ensures full 16 bit S/N ratio
Insensitive to input clock duty cycle
Power down for portable computers
AC Coupling/Portable Applications
For applications in portable computers, see the
MK14223, which is specified to operate at 3.3V. It
is possible to drive the MK1422 with a 3.3V,
14.318MHz clock by a.c. coupling using a 0.01F
capacitor connected in series to the X1 pin. But the
operating VDD on pin 2 must be 5V10%. This
technique is also effective if the input clock doesn't
meet the VIH and VIL specifications on page 3.
Additional Clocks or Features
If more than these three output clocks or features
such as output enable are needed, MicroClock can
provide a quick turn modification for your custom
requirements.
Output
Buffer
33.868 MHz
Crystal
Oscillator
14.318 MHz
crystal or clock
X1/ICLK
X2
All Chip
Power Down
MK1422
OPL3/4+Codec Portable Clock Source
MDS 1422 B
2
Revision 080698
Printed 11/15/00
Integrated Circuit Systems525 Race StreetSan JoseCA95126(408)295-9800telwww.icst.com
Number
Name
Type
Description
1
X1/ICLK
I
Crystal Connection. Connect to a 14.318 MHz crystal or clock.
2
VDD
P
Connect to +5V.
3
GND
P
Connect to ground.
4
16.9M
O
16.9344 MHz clock output for stereo codec.
5
24.6M
O
24.576 MHz clock output for stereo codec.
6
33.9M
O
33.868 MHz clock output for OPL4.
7
PD
I
Power Down. Shuts off entire chip when low. All clock outputs stop low.
8
X2
O
Crystal Connection to a 14.318 MHz crystal, or leave unconnected for clock input.
Pin Descriptions
Key: I = Input, O = output, P = power supply connection
Pin Assignment
1
8
2
3
4
7
6
5
X1/ICLK
VDD
GND
16.9M
X2
PD
33.9M
24.6M
14.318 MHz in
Pin 1
33
(optional)
2
3
5
6
7
0.1F
16.9MHz out
24.6MHz out
G
V
33
(optional)
Suggested Layout
4
8
External Components/Crystal Selection
A minimum number
of external components are required for proper oscillation. For a crystal input, one
22pF load capacitor should be connected to each of the X1 and X2 pins and ground, and a parallel
resonant 14.318 MHz, 16pF load, crystal is recommended. Load capacitor values near these are acceptable,
as is a series resonant crystal, but either will result in frequencies which are further off of the target
frequency. For a clock input, connect to X1 and leave X2 unconnected. A decoupling capacitor of 0.1F
should be connected between VDD and GND, and 33
terminating resistors may be used on the clock
outputs.
33
(optional)
33.9MHz
out
PD
MK1422
OPL3/4+Codec Portable Clock Source
MDS 1422 B
3
Revision 080698
Printed 11/15/00
Integrated Circuit Systems525 Race StreetSan JoseCA95126(408)295-9800telwww.icst.com
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 25C.
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply Voltage, VDD
Referenced to GND
7
V
Inputs
Referenced to GND
-0.5
VDD+.5V
V
Clock Outputs
Referenced to GND
-0.5
VDD+.5V
V
Ambient Operating Temperature
0
70
C
Soldering Temperature
Max of 20 seconds
260
C
Storage temperature
-65
150
C
DC CHARACTERISTICS
Operating Voltage, VDD
4.5
5.5
V
Input High Voltage, VIH, ICLK
VDD/2 + 1
VDD/2
V
Input Low Voltage, VIL, ICLK
VDD/2
VDD/2 - 1
V
Input High Voltage, VIH, PD
2
V
Input Low Voltage, VIL, PD
0.8
V
Output High Voltage, VOH
IOH=-25mA
2.4
V
Output Low Voltage, VOL
IOL=25mA
0.4
V
Output High Voltage, VOH
IOH=-4mA
VDD-0.4
V
Output Low Voltage, VOL
IOL=4mA
0.4
V
Operating Supply Current, IDD
No Load
18
mA
Power Down Operating Current, IDDPD
No Load
20
A
Input Capacitance
7
pF
Actual Mean Frequency versus Target
Outputs
0.2
%
AC CHARACTERISTICS
Input Clock Frequency
14.31818
MHz
Input Clock Duty Cycle, 14.318MHz
Time above VDD/2
20
80
%
Output Clock Rise Time
0.8 to 2.0V
1.5
ns
Output Clock Fall Time
2.0 to 0.8V
1.5
ns
Output Clock Duty Cycle, 24.576MHz
Time above 1.5 V
40
50
60
%
Output Clock Duty Cycle, 16.9344 MHz
Time above 1.5 V
45
50
55
%
Output Clock Duty Cycle, 33.868MHz
Time above 1.5 V
45
50
55
%
Absolute Clock Period Jitter
Pins 4, 5, 6 only
-400
200
400
ps
One Sigma Clock Period Jitter
Pins 4, 5, 6 only
60
ps
MK1422
OPL3/4+Codec Portable Clock Source
MDS 1422 B
4
Revision 080698
Printed 11/15/00
Integrated Circuit Systems525 Race StreetSan JoseCA95126(408)295-9800telwww.icst.com
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.
Package Outline and Package Dimensions
Inches
Inches
Millimeters
Millimeters
Symbol
Min
Max
Min
Max
A
0.055
0.068
1.397
1.7272
b
0.013
0.019
0.330
0.483
D
0.185
0.200
4.699
5.080
E
0.150
0.160
3.810
4.064
H
0.225
0.245
5.715
6.223
e .050 BSC
.050 BSC
1.27 BSC
1.27 BSC
h
0.015
0.381
Q
0.004
0.01
0.102
0.254
8 pin SOIC
Ordering Information
Part/Order Number
Marking
Package
Temperature
MK1422S
MK1422S
8 pin SOIC
0 to 70 C
MK1422STR
MK1422S
Add tape and reel
0 to 70 C
c
A
b
D
E
H
e
h x 45
Q
Pin 1
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