MK1418/MK1420 OPL3, OPL4 + Codec Clock Source Description Features The MK1418 and MK1420 are the ideal way to generate clocks for new sound cards. The MK1420 provides clocks for Analog Devices’ AD1848, Crystal Semiconductor’s CS4231, and Yamaha’s OPL3L, OPL3LS, and OPL4. The MK1420 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. The chips are ideal for add-in sound cards and motherboards with integrated sound. In an 8 pin SOIC, the MK1420 can save component count, board space, and cost over surface mount crystals, and increase reliability by eliminating three or four mechanical devices from the board. • Packaged in 8 pin SOIC • Input crystal or clock frequency of 14.318 MHz • MK1418 is clock input only • MK1420 output clock frequencies of 16.934MHz, 24.576 MHz, 33.868 MHz, and 14.318 MHz • Advanced, low power CMOS process • Lowest jitter in industry for best audio performance • Insensitive to input clock duty cycle • 50% (typ) 14.318 MHz duty cycle with crystal MicroClock offers many other parts with stereo codec support. The MK1430 has 5 output clocks, the MK1448 has 7, the MK1444 has eight including DSP clocks, and the MK1450/1 offers Pentium™ and SCSI support, plus the stereo codec clocks. Block Diagram VDD GND Additional Clocks or Features If more than these four output clocks or features such as power down are needed, MicroClock has many other products in development. Consult MicroClock for your specific needs. Clock Synthesis Circuitry 14.318 MHz crystal or clock X1 Crystal Oscillator X2 AC Coupling/Portable Applications For applications in portable computers, it is possible to drive the input clock with a 3.3V, 14.318MHz clock by a.c. coupling using a 0.01µF capacitor connected in series to the CLKIN 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. Output Buffer 16.934 MHz Output Buffer 24.576 MHz Output Buffer 33.868 MHz (MK1420 only) Output Buffer 14.318 MHz (MK1420 only) 1 Revision 013098 Printed 11/15/00 MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 1418/20 A MK1418/MK1420 OPL3, OPL4 + Codec Clock Source Suggested Layout for MK1420 Pin Assignments clock only MK1418 ICLK 1 8 GND VDD 2 7 VDD GND 3 6 GND 16.9M 4 5 24.6M 14.318 MHz crystal V Pin 1 8 2 7 14.3MHz out 33Ω (optional) 0.1µF 3 6 33.9MHz out 33Ω (optional) G MK1420 X1 1 8 X2 VDD 2 7 14.3M GND 3 6 33.9M 16.9M 4 5 24.6M 4 33Ω (optional) 16.9MHz out 5 33Ω (optional) 24.6MHz out Pin Descriptions for MK1420 Number 1 2 3 4 5 6 7 8 Name X1 VDD GND 16.9M 24.6M 33.9M 14.3M X2 Type I P P O O O O O Description Crystal Connection. Connect to a 14.318 MHz crystal or clock. Connect to +5V. Connect to ground. 16.9344 MHz clock output for stereo codec. 24.576 MHz clock output for stereo codec. 33.868 MHz clock output for OPL4. 14.318 MHz clock buffered output for OPL3 or PCMCIA controller. Crystal Connection to a 14.318 MHz crystal, or leave unconnected for clock input. Key: I = Input, O = output, P = power supply connection 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. Values near these are acceptable, as is a series resonant crystal, but either will result in frequencies which are slightly (up to 0.06%) different from the ideal. For a clock input, connect to X1 and leave X2 unconnected. A decoupling capacitor of 0.1µF should be connected between VDD and GND, and 33Ω terminating resistors may be used on the clock outputs. These terminating resistors are unnecessary for clock traces less than 1” (25mm). 2 Revision 013098 Printed 11/15/00 MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 1418/20 A MK1418/MK1420 OPL3, OPL4 + Codec Clock Source Electrical Specifications Parameter Conditions Minimum Typical Maximum Units 7 VDD+.5V VDD+.5V 70 260 150 V V V °C °C °C 5.5 V V V V V V mA pF % ABSOLUTE MAXIMUM RATINGS (note 1) Supply Voltage, VDD Inputs Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Referenced to GND Referenced to GND Referenced to GND -0.5 -0.5 0 Max of 20 seconds -65 DC CHARACTERISTICS (at 5.0V unless otherwise noted) Operating Voltage, VDD Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage, VOH Output High Voltage, VOH Output Low Voltage, VOL Operating Supply Current, IDD Input Capacitance Actual Mean Frequency versus Target 4.5 3.5 IOH=-4mA IOH=-25mA IOL=25mA No Load 2.5 2.5 1.5 VDD-0.4 2.4 0.4 18 7 Outputs ±0.2 AC CHARACTERISTICS Input Clock or Crystal Frequency Input Clock Duty Cycle, 14.318MHz Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle, 24.576MHz Output Clock Duty Cycle, 16.9344 MHz Output Clock Duty Cycle, 33.868MHz Output Clock Duty Cycle, 14.318 MHz, Note 3 Absolute Clock Period Jitter, except 14.3 One Sigma Clock Period Jitter, except 14.3 14.31818 Time above 2.5V 0.8 to 2.0V 2.0 to 0.8V Time above 1.5V Time above 1.5V Time above 1.5V Time above 1.5V Pins 4, 5, 6 only Pins 4, 5, 6 only 20 40 45 45 45 -400 45 50 50 50 200 60 80 1.5 1.5 60 55 55 55 400 MHz % ns ns % % % % ps ps 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. If crystal is used as input with CL = 16pf. If a clock is used as input, the duty cycle of the 14.318MHz output will be the same as the input clock. 3 Revision 013098 Printed 11/15/00 MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 1418/20 A MK1418/MK1420 OPL3, OPL4 + Codec Clock Source Package Outline and Package Dimensions 8 pin SOIC E H Pin 1 h x 45° D Q A c e b Symbol A b D E H e h Q L 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 0.016 0.035 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 0.406 0.889 L Ordering Information Part/Order Number MK1418S MK1418STR MK1420S MK1420STR Marking MK1418S MK1418S MK1420S MK1420S Package 8 pin SOIC Add tape and reel 8 pin SOIC Add tape and reel Temperature 0-70°C 0-70°C 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. 1201BO.7 4 Revision 013098 Printed 11/15/00 MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 1418/20 A