MK1491-09 AMD Geode™ GX2 Clock Source Description Features The MK1491-09 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 clocks, 48 MHz clocks for Super I/O and USB, as well as multiple Reference outputs. • Packaged in 28-pin SSOP (209 mil body) • Available in Pb (lead) free packaged • Provides all critical timing for the AMD Geode companion chip The device has multiple power-down modes to reduce power consumption. • • • • • • • Four selectable PCI clocks Three LPC interface clocks One Fixed 66 MHz clock 2 Reference clocks 48 MHz USB and 48 MHz IO support Power down mode Low EMI Enable pin reduces EMI radiation on PCI clocks, LCLKS, and 66 MHz clock • Operating voltage of 3.3 V ±5% Block Diagram VDD GND 6 6 4 Sel66/33# 3 Clocks PD# PCI (66/33 MHz) LCLK (33 MHz) 66 MHz USB Clock 48/TS# 48 MHz REFCLK1 XI 14.31818 MHz crystal Crystal Oscillator REFCLK0/Spread# XO 1 MDS 1491-09 G Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com MK1491-09 AMD Geode™ GX2 Clock Source Pin Assignment PCI Frequency Select Table GND 1 28 VDD XI 2 27 RefCLK0/Spread# XO 3 26 RefCLK1 VDD 4 25 VDD LCLK0/33M 5 24 PCICLK3/33-66M LCLK1/33M 6 23 PCICLK2/33-66M GND 7 22 GND VDD 8 21 GND LCLK2/33M 9 20 PCICLK1/33-66M 10 19 VDD GND 11 18 PCICLK0/33-66M VDD 12 17 PD# 48M 13 16 66M 48M/TS# 14 15 GND Sel66/33# Sel66/33# PCI Frequency 0 33 MHz 1 66 MHz EMI Control Spread# PCI Low EMI 0 ON 1 OFF Spread direction is DOWN. Pin Descriptions Pin Number Pin Name Pin Type Pin Description 1, 7, 11, 15, 21, 22 GND P Connect to Ground. 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. 4, 8, 12, 19, 25, 28 VDD P Connect to 3.3 V. 5, 6, 9 LCLK O 33 MHz low skew clock outputs. 10 Sel66/33# I Selects frequency on PCICLK. 13 48M O 48 MHz clock output. 14 48M/TS# I/O 48 MHz clock output. TS# is high at power-up. 16 66M O 66 MHz clock output. 17 PD# I Power-down input (see table on page 3). 18, 20, 23, 24 PCICLK O 33 to 66 MHz PCI synchronous clock outputs with low skew. 26 RefCLK1 O Buffered reference output of 14.31818 MHz. 27 RefCLK0/ Spread# I/O Buffered reference output of 14.31818 MHz. Spread select at power-up. For Spread#, see 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 TS#, Spread#, PD#, and Sel66/33. 2 MDS 1491-09 G Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com MK1491-09 AMD Geode™ GX2 Clock Source Power Down Control Table PD# Functions 0 All clocks are stopped low. 1 All clocks are running. Power-on Default Conditions Pin # Function Default 14 TS# H All outputs enabled. 27 Spread# H Spread disabled. 17 PD# H PCI clocks set to 33.3 MHz. Refer to Power Down Control Table above. 10 Sel66/33 H PCI frequency = 66 MHz. 3 MDS 1491-09 G Integrated Circuit Systems, Inc. Condition ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com MK1491-09 AMD Geode™ GX2 Clock Source External Components The MK1491-09 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 MK1491-09 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 14.318 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 MK1491-09 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. This status (pulled high or low) then determines the frequency selections and power down modes (see the tables on pages 2 and 3). Within 10ms after power up, the inputs change to outputs and the clocks start up. In the diagrams below, the 33Ω resistors are the normal output termination resistors. The 10kΩ resistor pulls low to generate a logic zero when needed. Weak internal pull-up resistors are present on TS#, Spread#, PD#, and Sel66/33 to pull the pin to high when left floating. 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. 4 MDS 1491-09 G Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com MK1491-09 AMD Geode™ GX2 Clock Source Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK1491-09. 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 (referenced to VSS) 4.6 V All Inputs and Outputs (referenced to VSS) -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 (10 seconds max) 260°C Spread Spectrum Enabled for PCI and LPC Clocks 30 kHz min., 33 kHz max. DC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +70°C Parameter Symbol Conditions Min. Typ. Max. Units 3.3 3.46 V Operating Voltage VDD 3.13 Input High Voltage VIH 2 VDD V Input Low Voltage VIL VSS 0.8 V Output High Voltage VOH IOH = -12 mA Output Low Voltage VOL IOL = 12 mA 0.4 V Operating Supply Current IDD VDD = 3.3 V 60 mA 0.5 mA 2.4 V Clock Disable Mode Supply Current Internal Pull-up Resistor Input Capacitance CIN kΩ All inputs except XI 5 pF 5 MDS 1491-09 G Integrated Circuit Systems, Inc. All inputs except XI ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com MK1491-09 AMD Geode™ GX2 Clock Source AC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +70° C Parameter Symbol Input Frequency Conditions Min. FIN Typ. Max. 14.31818 Output Clock Skew Rate (PCI and LPC), load = 30 pF Between 0.4 V and 2.4 V Output Clock Rise and Fall Time (all but PCI and LPC), load=pF tOR, tOF Output Clock Duty Cycle, all MHz Clocks tOD Units MHz 4 V/ns Between 0.4 V and 2.4 V 0.5 2 ns At 1.5 V 40 60 % PCI Output to Output Skew, at 33 MHz Rising edges at 1.5 V 500 ps PCI Output to Output Skew, at 66 MHz Rising edges at 1.5 V 250 ps LPC Output to Output Skew Rising edges at 1.5 V 500 ps PCI to LPC Output to Output Skew (note 1) Rising edge at 1.5 V 500 ns Cycle-to-Cycle Jitter, PCICLK 300 ps Cycle-to-Cycle Jitter, LPCCLK 500 ps Cycle-to-Cycle Jitter, USBCLK and 48 MHz 500 ps Cycle-to-Cycle Jitter, REFCLKs 1400 ps Power-on Time, applied VDD to all Clocks Stable 5 ms Load Capacitance Crystal 18 pF Note 1: Only valid when PCI is at 33 MHz. 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 6 MDS 1491-09 G Integrated Circuit Systems, Inc. Conditions ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com MK1491-09 AMD Geode™ GX2 Clock Source Marking Diagram 28 ICS 15 MK1491-09F ###### YYWW 1 14 Marking Diagram (for Pb free) 28 ICS 15 MK1491-09FLN ###### YYWW 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. 3. “LN” designates Pb (lead) free. 7 MDS 1491-09 G Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com MK1491-09 AMD Geode™ GX2 Clock Source Package Outline and Package Dimensions (28-pin SSOP, 209 mil Body) Package dimensions are kept current with JEDEC Publication No. 95, MO-150 28 Millimeters Symbol E1 INDEX AREA Min A A1 A2 b c D E E1 e L α E 1 2 D Max Min — 2.00 0.05 — 1.65 1.85 0.22 0.38 0.09 0.25 9.90 10.50 7.40 8.20 5.00 5.60 0.65 Basic 0.55 0.95 0° 8° Max — 0.079 0.002 — 0.065 0.073 0.009 0.015 0.0035 0.010 0.390 0.413 0.291 0.323 0.197 0.220 0.0256 Basic 0.022 0.037 0° 8° The controlling dimensions is inches A A2 Inches A1 c - Ce SEATING PLANE b L Ordering Information Part / Order Number Marking (see note 1) Low EMI Shipping Packaging Feature Package Temperature MK1491-09F MK1491-09F Yes Tubes 28-pin SSOP 0 to +70°C MK1491-09FTR MK1491-09F Yes Tape and Reel 28-pin SSOP 0 to +70°C MK1491-09FLN MK1491-09FLN Yes Tubes 28-pin SSOP 0 to +70°C MK1491-09FLNTR MK1491-09FLN Yes Tape and Reel 28-pin SSOP 0 to +70°C Note: 1. “L” designates Pb (lead) free. 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. 8 MDS 1491-09 G Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 080204 ● tel (408) 297-1201 ● www.icst.com