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| MK2745-21 DVD/MPEG Clock Source Description The MK2745-21 is a low cost, low jitter, high performance clock synthesizer for DVD and other MPEG 2 based applications. Using analog PhaseLocked Loop (PLL) techniques, the device accepts a 27.00MHz fundamental mode crystal or clock input to produce multiple output clocks including the processor clock, the processor clock divided by two, 27 MHz, 24.576 MHz, and a selectable audio clock. The audio clocks are frequency locked to the 27.00MHz input using our patented zero ppm error techniques, allowing audio and video to track exactly, thereby eliminating the need for large buffer memory. MicroClock manufactures the largest variety of DVD, Set-Top Box, and multimedia clock synthesizers for all applications. Consult MicroClock to eliminate crystals and oscillators from your board. Features * Packaged in 16 pin narrow (150 mil) SOIC * Ideal for LuxSonor's DVD solutions * 3.3V upgrade to MK2744 * Patented zero ppm audio clock error for 256X and 384X sampling rates * Selectable audio sampling frequencies support 32 kHz, 44.1 kHz, and 48 kHz in most DACs * 27.00 MHz fundamental crystal or clock input * Eight selectable processor frequencies * Fixed clocks of 27 and 24.576 MHz * Zero ppm error in all clocks * Full CMOS outputs with 25mA output drive capability at TTL levels * Advanced, low power, sub-micron CMOS process * 3.0V to 5.5V operating voltage * See also the MK2712 for NTSC/PAL clocks Block Diagram VDD GND 2 AS2:0 3 2 Output Buffer Audio Clock 24.576 MHz Processor Clock PCLK/2 27 MHz PS1:0 27.00 MHz clock or crystal X1 2 Clock Synthesis and Control Circuitry Output Buffer Output Buffer /2 Output Buffer Output Buffer X2 Clock Buffer/ Crystal Oscillator MDS 2745-21 B 1 Revision 120400 Printed 12/5/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com MK2745-21 DVD/MPEG Clock Source Pin Assignment MK2745-21 PS1 X2 X1/ICLK VDD GND ACLK PCLK AS2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PS0 24.576M PCLK/2 VDD AS1 GND 27M AS0 Audio Clock (in MHz) Decoding Table AS2 AS1 AS0 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 ACLK 12.288 11.2896 8.192 24.576 8.192 16.9344 18.432 11.2896 Processor Clock (in MHz) PS1 0 0 1 1 PS0 0 1 0 1 PCLK 66.66 80 50 60 PCLK/2 33.33 40 25 30 0 = connect directly to ground 1 = connect directly to VDD 16 pin (150 mil) SOIC Pin Descriptions Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name PS1 X2 X1/ICLK VDD GND ACLK PCLK AS2 AS0 27M GND AS1 VDD PCLK/2 24.576M PS0 Type I XO XI P P O O I I O P I P O O I Description Processor clock Select 1. Selects processor clock outputs per table above. Crystal connection. Connect to 27 MHz crystal. Leave unconnected for clock input. Crystal connection. Connect to 27 MHz crystal or connect to 27 MHz input clock. Connect to +3.3 V or +5 V. Must be same as other VDD. Connect to ground. Audio Clock output. Determined by status of AS2, AS1, AS0. See table above. Processor Clock output. Determined by status of PS1, PS0. See table above. Audio clock Select 2. Selects audio clock on pin 6 per table above. Audio clock Select 0. Selects audio clock on pin 6 per table above. 27.00 MHz clock output. Connect to ground. Audio clock Select 1. Selects audio clock on pin 6 per table above. Connect to +3.3 V or +5 V. Must be same as other VDD. Processor Clock divided by two output. Determined by status of PS1, PS0. See table above. 24.576 MHz clock output. Processor clock Select 0. Selects processor clock outputs per table above. Key: I = Input, O = output, P = power supply connection MDS 2745-21 B 2 Revision 120400 Printed 12/5/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com MK2745-21 DVD/MPEG Clock Source Electrical Specifications Parameter Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Operating Voltage, VDD Input High Voltage, VIH, X1/ICLK pin only Input Low Voltage, VIL, X1/ICLK pin only Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage, VOH Output Low Voltage, VOL Output High Voltage, VOH, CMOS level Operating Supply Current, IDD Short Circuit Current Input Capacitance Input Frequency Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Frequency error, all clocks Absolute Jitter, short term Notes: Conditions Referenced to GND Referenced to GND Max of 20 seconds -65 3 VDD/2 + 1 2 0.8 IOH=-25mA IOL=25mA IOH=-8mA No Load, note 2 Each output 2.4 0.4 VDD-0.4 37 100 7 27.000 0.8 to 2.0V 2.0 to 0.8V At VDD/2 Variation from mean 1.5 1.5 60 1 Minimum Typical Maximum 7 VDD+0.5 70 260 150 5.5 VDD/2 VDD/2 VDD/2 - 1 Units V V C C C V V V V V V V V mA mA pF MHz ns ns % ppm ps ABSOLUTE MAXIMUM RATINGS (note 1) -0.5 0 DC CHARACTERISTICS (VDD = 5.0V unless noted) AC CHARACTERISTICS (VDD = 5.0V unless noted) 40 0 200 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. With Processor clock at 50MHz, and ACLK at 16.93MHz. External Components The MK2745-21 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.1F should be connected between VDD and GND, as close to the MK2745-21 as possible. A series termination resistor of 33 may be used for each clock output. If a clock input is not used, the 27.00 MHz crystal must be connected as close to the chip as possible. The crystal should be a fundamental mode (do not use third overtone), parallel resonant, 50ppm or better. Crystal capacitors should be connected from pins X1 to ground and X2 to ground. The value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps (pF) = (CL -6) x 2. So for a crystal with 16pF load capacitance, two 20pF caps should be used. MDS 2745-21 B 3 Revision 120400 Printed 12/5/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com MK2745-21 DVD/MPEG Clock Source Package Outline and Package Dimensions 16 pin SOIC narrow Symbol A b c D E H e h Q Inches Min Max 0.055 0.070 0.013 0.019 0.007 0.010 0.385 0.400 0.150 0.160 0.225 0.245 .050 BSC 0.016 0.004 0.01 Millimeters Min Max 1.397 1.778 0.330 0.483 0.191 0.254 9.779 10.160 3.810 4.064 5.715 6.223 1.27 BSC 0.406 0.102 0.254 E H D Q e b c h x 45 A Ordering Information Part/Order Number MK2745-21S MK2745-21STR Marking MK2745-21S MK2745-21S Shipping packaging tubes tape and reel Package Temperature 16 pin narrow SOIC 0-70C 16 pin narrow SOIC 0-70C Rev. 03318, version A . First publication, Preliminary. Rev. 04218, version B. Corrected VDD, VIH/VIL under DC Characteristics. Preliminary. 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. MDS 2745-21 B 4 Revision 120400 Printed 12/5/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com |
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