K142 Integrated Circuit Systems, K142 Datasheet

K142

Manufacturer Part Number

K142

Description

OPL3/4+Codec Portable Clock Source

Manufacturer

Integrated Circuit Systems

Datasheet

1.K142.pdf (4 pages)

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Block Diagram

MDS 1422 B

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.

Description

All Chip

Power Down

Integrated Circuit Systems•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com

14.318 MHz

crystal or clock

X1/ICLK

VDD GND

Oscillator

Crystal

Clock Synthesis

OPL3/4+Codec Portable Clock Source

Circuitry

Features

• Packaged in 8 pin SOIC

• Input crystal or clock frequency of 14.318 MHz

• Output clock frequencies of 16.934 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 0.01µF

capacitor connected in series to the X1 pin. But the

operating VDD on pin 2 must be 5V±10%. 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.

24.576 MHz, and 33.868 MHz

Output

Buffer

Revision 080698

16.934 MHz

24.576 MHz

33.868 MHz

MK1422

Printed 11/15/00

Related parts for K142

K142 Summary of contents

Page 1

... 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 possible to drive the MK1422 with a 3.3V, 14.318MHz clock by a.c. coupling using a 0.01µF capacitor connected in series to the X1 pin. But the operating VDD on pin 2 must be 5V±10%. This technique is also effective if the input clock doesn’ ...

Page 2

... MHz clock output for OPL4. Power Down. Shuts off entire chip when low. All clock outputs stop low. Crystal Connection to a 14.318 MHz crystal, or leave unconnected for clock input. 2 Pin (optional (optional) 24.6MHz out Revision 080698 MK1422 PD 33.9MHz out Printed 11/15/00 ...

Page 3

... IOH=-4mA VDD-0.4 IOL=4mA No Load No Load Outputs Time above VDD/2 20 0.8 to 2.0V 2.0 to 0.8V Time above 1 Time above 1 Time above 1 Pins only -400 Pins only 3 MK1422 Typical Maximum Units 7 V VDD+.5V V VDD+. °C 260 °C 150 °C 5.5 V VDD/2 V ...

Page 4

... Integrated Circuit Systems•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com OPL3/4+Codec Portable Clock Source 45° Marking Package MK1422S 8 pin SOIC MK1422S Add tape and reel 4 MK1422 Inches Inches Millimeters Millimeters Symbol Min Max Min A 0.055 0.068 1.397 b ...

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