MK1491-06 AMD Geode™ Clock Source Description Features The MK1491-06 is a low-cost, low-jitter, high-performance clock synthesizer for AMD’s Geode-based computer and portable appliance applications. Using patented analog Phased-Locked Loop (PLL) techniques, the device accepts a 14.318 MHz crystal input to produce multiple output clocks. It provides selectable PCI local bus and AC97 audio clocks, 24 MHz and 48 MHz clocks for Super I/O and USB, as well as multiple Reference outputs. • Packaged in 28-pin SOIC or in 28-pin SSOP • Available in Pb (lead) free • Provides all critical timing for the AMD Geode companion chip • • • • • • • • The device has multiple power-down modes to reduce power consumption. Four PCI clocks Selectable PCIF on up to 2 outputs Early PCI clock selectability Up to 4 Reference clocks 48 MHz USB and 24MHz SIO support AC97 audio clock Multiple power down modes Low EMI Enable pin reduces EMI radiation on PCI clocks (patented) • Operating voltage of 3.3 V ±5% Block Diagram VDD GND 6 5 2 PCI Frequency Select Low EMI Enable PCIF Function Enable 3 Early PCI Enable PCI Clocks SLOW# PCI EPCI/PCI PCISTP# PWRDWN# Audio Select 16.394 MHz or 24.576 MHz or 49.152 MHz Audio Clock 48 MHz Fixed Clocks 14.3M/24M Select XI 14.31818 MHz crystal 14.318 MHz or 24 MHz MUX Crystal Oscillator 3 14.318 MHz XO 1 MDS 1491-06 J Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source Pin Assignment PCI Frequency Select Table VDD 1 28 AC97 AUDIO (PEN) XI 2 27 PCI XO 3 26 VDD TS FS PCI 0 0 Tristate all clocks 0 1 Reserved 0 30 MHz GND 4 25 PCI M 14.3M (TS) 5 24 PCI M 1 33.3 MHz 14.3M 6 23 GND 1 0 25 MHz GND 7 22 PCI (EPCI#) 1 1 37.5 MHz 14.3M (SEL AUDIO) 8 21 48M (LE#) VDD 9 20 VDD SLOW# 10 19 24M/14.3M GND 11 18 VDD 24M/14.3M Frequency Select Table SEL24 FS 12 17 GND 0 SEL24 13 16 PCISTP# 1 VDD 14 15 PWRDWN# 24M/14.3M 14.31818 MHz 24.0 MHz PCIF Enable Control PEN Early PCI Control Table EPCI# PCI (Pin 22) 0 1 ns early 1 Normal ON 1 OFF 0 PCI PCI M PCI PCIF 1 PCIF PCIF AC97 Audio Frequency Select PCI Low EMI 0 Pin 24 PCIF continues to run in PCI STOP mode. See table on page 4. EMI Control LE# Pin 25 SEL AUDIO Spread direction is DOWN. AC97 AUDIO 0 16.9344 MHz M 24.576 MHz 1 49.152 MHz Pin Descriptions Pin Number Pin Name Pin Type 1, 9, 14 VDD P Connect to +3.3 V. Must be same voltage on all pins. 2 XI I Crystal connection. Connect to a 14.31818 MHz crystal or input clock. 3 XO O Crystal connection. Connect to a 14.31818 MHz crystal, or leave unconnected for clock. 4, 7, 11, 17, 23 GND P Connect to Ground. 5 14.3M (TS) TI/O 6 14.3M O 14.318 MHz output. Input control for all clocks per table above. 14.318 MHz buffered reference clock output. 2 MDS 1491-06 J Integrated Circuit Systems, Inc. Pin Description ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source Pin Number Pin Name Pin Type Pin Description 8 14.3M (SEL AUDIO) TI/O 10 SLOW# I PCI normal or slow mode select input per table on page 4. 12 FS I Frequency Select for PCI clocks per table above. 13 SEL24 I Fixed frequency select input per table above. Selects frequency on pin 19. 15 PWRDWN# I Power down control; defined in table on page 4. 16 PCISTP# I PCI Stop power down control; defined in table on page 4. 18, 20, 26 VDD P Connect to +3.3 V. Must be same voltage on all pins. 19 24M/14.3M O Fixed frequency clock output per table above. 21 48 (LE#) I/O Fixed frequency clock output and low EMI (spread spectrum) enable input per table above. 22 PCI (EPCI#) I/O PCI Output clock that can be early. Input control for Early PCI per table above. 24 PCI O PCI Output clock. PCI/PCIF control set by PEN per table above. 25 PCI O PCI Output clock. PCI/PCIF control set by PEN per table above. 27 PCI O PCI Output clock. 28 AC97 AUDIO (PEN) TI/O 14.318 MHz output and audio frequency select input per table above. Audio clock output and PCIF Function Enable per table above. KEY: I = Input TI = Tri-level O = Output P = Power supply connection (T)I/O = Input on power up, becomes an Output after 10 ms Weak internal pull-up resistors are present on SEL24, EPCI#, FS, LE#, PCISTP#, and SLOW#. These pins should be tied to VDD or GND, and not be left floating. Internal resistors on PEN, SEL AUDIO, and TS pull to mid-level (M). 3 MDS 1491-06 J Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source Power Down Control Table PCISTP# PWRDWN# SLOW# MODE PCI PCIF 24/14.3 14.3 Description X 0 X Power down LOW LOW LOW LOW All outputs low. PLL’s and oscillators off. 0 1 X PCI STOP LOW ON ON ON PCI clocks synchronously enter and leave low state. 1 1 X ON ON ON ON ON All clocks on. Key: 1 = connected to VDD, 0 = connected to ground, X = any valid logic level, combination inputs/outputs should be connected to VDD or ground through a 10 kΩ resistor as shown below. Power-on Default Conditions Pin # Function Default 5 TS M All outputs enabled. 8 SEL AUDIO M Audio clock (pin 28) set to 24.576 MHz 10 SLOW# 1 PCI clocks set to 33.3 MHz. Refer to Power Down Control Table above. 12 FS 1 PCI frequency = 33.3 MHz. 13 SEL 24 1 24M/14.3M (pin 19) set to 24 MHz. 15 PWRDWN# 1 All clocks running. 16 PCISTP# 1 PCI clocks running. 21 LE# 1 Low EMI function OFF 22 EPCI# 1 Pin 22 set to normal PCI signal (not early). 28 PEN M PCI (pin 25) set to PCI clock (33.33 MHz). PCI (pin 24) set to PCIF clock (33.33 MHz). 4 MDS 1491-06 J Integrated Circuit Systems, Inc. Condition ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source External Components The MK1491-06 requires some inexpensive external components for proper operation. Decoupling capacitors of 0.1µF should be connected on each VDD pin to ground, as close to the MK1491-06 as possible. A series termination resistor of 33Ω may be used for each clock output. See the discussion below for other external resistors required for proper I/O operation. The 14.3 MHz oscillator has internal caps that provide the proper load for a parallel resonant crystal with CL=18 pF. For tuning with other values of CL, the formula 2*(CL-18) gives the value of each capacitor that should be connected between X1 and ground and X2 and ground. I/O Structure The MK1491-06 provides more functionality in a 28-pin package by using a unique I/O technique. The device checks the status of all I/O pins during power-up and at exit from the Power Down state. This status (pulled high, low, or mid-level) then determines the frequency selections and power down modes (see the tables on pages 2 and 4). Within 10ms after power up, the inputs change to outputs and the clocks start up. In the diagrams to the right, the 33Ω resistors are the normal output termination resistors. The 10kΩ resistor pulls low to generate a logic zero. Weak internal pull-up resistors are present on SEL24, EPCI#, FS, LE#, PCISTP#, and SLOW#. These pins should be connected directly to VDD or GND if not under active control. Internal resistors on PEN, SEL AUDIO, and TS pull to a mid-level (M). 33 For select = 0 (low) To load* I/O 10 k Do not stuff for “1” selection *Note: Do not use a TTL load. This will overcome the 10 kΩ pull-down and force the input to a logic 1. 5 MDS 1491-06 J Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK1491-06. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Rating Supply Voltage, VDD 7V All Inputs and Outputs -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +70°C Storage Temperature -65 to +150°C Junction Temperature 125°C Soldering Temperature 260°C Recommended Operation Conditions Parameter Min. Ambient Operating Temperature Typ. 0 Power Supply Voltage (measured in respect to GND) +3.15 +3.3 Max. Units +70 °C +3.45 V DC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature 0 to +70°C Parameter Symbol Conditions Min. Typ. Max. Units 3.3 3.45 V Operating Voltage VDD 3.15 Input High Voltage VIH 2 Input Mid-level Voltage VIM 1.2 Input Low Voltage VIL Output High Voltage VOH IOH = -8 mA Output Low Voltage VOL IOL = 8 mA Output High Voltage VOH IOH = -8 mA Operating Supply Current IDD 33 MHz, no load Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 0.8 V V V 30 mA 15 µA ±60 mA 7 pF 6 ● V V VDD-0.4 CIN MDS 1491-06 J 1.6 0.4 VDD = 3.3 V Input Capacitance 1.4 2.4 Power Down Mode Supply Current Short Circuit Current, SIngle Output Driver V Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source AC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature 0 to +70° C Parameter Symbol Conditions Min. Typ. Max. 14.31818 Units Input Frequency FIN Output Clock Rise Time tOR 20% to 80% 1.5 ns Output Clock Fall Time tOF 80% to 20% 1.5 ns Output Clock Duty Cycle, all MHz Clocks tOD At 1.5 V 55 % 500 ps PCI Output to Output Skew 45 MHz 49 to 51 Rising edges at 1.5 V Skew of EPCI with respect to PCI Cycle-to-Cycle Jitter, PCI clocks EMI Reduction, peaks of 5th 19th odd harmonics 33.3 MHz PCI Clock 1 ns 250 ps 6 11 dB Power-up Time, PWRDWN# High to all Clocks Stable 8 20 ms Power-on Time, applied VDD to all Clocks Stable 12 25 ms Thermal Characteristics Parameter Symbol Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case Min. Typ. Max. Units θJA Still air 100 °C/W θJA 1 m/s air flow 80 °C/W θJA 3 m/s air flow 67 °C/W 60 °C/W θJC 7 MDS 1491-06 J Integrated Circuit Systems, Inc. Conditions ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source Marking Diagram 28 ICS 15 ###### YYWW MK1491-06R 1 14 Notes: 1. ###### is the lot code. 2. YYWW is the last two digits of the year, and the week number that the part was assembled. 8 MDS 1491-06 J Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source Package Outline and Package Dimensions (28-pin SOIC, 150 mil Body) Package dimensions are kept current with JEDEC Publication No. 95, MO-153 C N Millimeters L INDEX AREA H E h x 45° 1 2 α D A A1 e Symbol Min A A1 B C D E e H h L α Inches Max Min Max 2.65 0.104 0.10 0.33 0.51 0.18 0.32 17.70 18.40 7.40 7.60 1.27 Basic 10.00 10.65 0.25 0.75 0.40 1.27 0° 8° .0040 .013 .020 .007 .013 .697 .724 .291 .299 0.050 Basic .394 .419 .010 .029 .016 .050 0° 8° SEATING PLANE B .10 (.004) 9 MDS 1491-06 J Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com MK1491-06 AMD Geode™ Clock Source Package Outline and Package Dimensions (28-pin SSOP, 150 mil Body, 0.025 mm Pitch) Package dimensions are kept current with JEDEC Publication No. 95, MO-153 28 Millimeters Symbol E1 A A1 A2 b C D E E1 e L α aaa E INDEX AREA 1 2 D A 2 Min A Inches Max Min 1.35 1.75 0.10 0.25 -1.50 0.20 0.30 0.18 0.25 9.80 10.00 5.80 6.20 3.80 4.00 0.635 Basic 0.40 1.27 0° 8° -0.10 Max .053 .069 .0040 .010 -.059 .008 .012 .007 .010 .386 .394 .228 .244 .150 .157 0.025 Basic .016 .050 0° 8° -0.004 A 1 c -Ce SEATING PLANE b L aaa C Ordering Information Part / Order Number Marking Shipping Packaging Package Temperature MK1491-06R MK1491-06R Tubes 28-pin SSOP 0 to +70°C MK1491-06RTR MK1491-06R Tape and Reel 28-pin SSOP 0 to +70°C MK1491-06RLF MK1491-06RLF Tubes 28-pin SSOP 0 to +70°C MK1491-06RLFTR MK1491-06RLF Tape and Reel 28-pin SSOP 0 to +70°C MK1491-06S MK1491-06S Tubes 28-pin SOIC 0 to +70°C MK1491-06STR MK1491-06S Tape and Reel 28-pin SOIC 0 to +70°C MK1491-06SLF MK1491-06SLF Tubes 28-pin SOIC 0 to +70°C MK1491-06SLFTR MK1491-06SLF Tape and Reel 28-pin SOIC 0 to +70°C “LF” denotes Pb (lead) free package. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) 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 ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments. 10 MDS 1491-06 J Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 110204 ● tel (408) 297-1201 ● www.icst.com