ICS650-40 ETHERNET SWITCH CLOCK SOURCE Description Features The ICS650-40 is a clock chip designed for use in Ethernet Switch applications. Using ICS’ patented Phase-Locked Loop (PLL) techniques, the device takes a 25 MHz crystal input and produces various output clock frequencies as listed in Output Select Table. • • • • • • • Packaged in 16-pin TSSOP Available in Pb (lead) free package Operating voltage of 3.3 V Low power consumption Input frequency of 25 MHz Low long-term jitter 2.5 V to 3.3 V clock outputs Block Diagram VDD 3 S1:S0 2 VDDOA Control Logic CLKA Phase Lock Loop CLKB X1/ICLK 25 MHz crystal or clock X2 Clock Buffer/ Crystal Oscillator 4 Optional tuning crystal capacitors OE VDDOB 1 MDS 650-40 C I n t e gra te d C i r c u i t S y s t e m s GND ● 525 Race Stre et, San Jo se, CA 9 5126 Revision 060705 ● te l (40 8) 2 97-12 01 ● w w w. i c st . c o m ICS650-40 ETHERNET SWITCH CLOCK SOURCE Pin Assignment Output Select Table (MHz) S1 S0 CLKA (MHz) CLKB (MHz) 0 0 127 127 0 1 133 133 GND 1 0 157 157 12 VDD 1 1 189 189 6 11 VDD VDDOB 7 10 S1 GND 8 9 S0 X1/ICLK 1 16 X2 VDD 2 15 GND GND 3 14 OE VDDOA 4 13 CLKA 5 CLKB 16-pin (173 mil) TSSOP Pin Descriptions Pin Number Pin Name Pin Type Pin Description 1 X1/ICLK Input Crystal or clock input. Connect to a 25 MHz crystal or single ended clock. 2 VDD Power Connect to +3.3 V. 3 GND Power Connect to ground. 4 VDDOA Power Connect to +2.5 V or +3.3 V. For clock output buffer A only. 5 CLKA Output Clock A output with weak pull-down resistor. 6 CLKB Output Clock B output with weak pull-down resistor. 7 VDDOB Power Connect to +2.5 V or +3.3 V. For clock output buffer B only. 8 GND Power Connect to ground. 9 S0 Input Select pin 0. 10 S1 Input Select pin 1. 11 VDD Power Connect to +3.3 V. 12 VDD Power Connect to +3.3 V. 13 GND Power Connect to ground. 14 OE Input Output enable tri-states outputs and device is not shut down. Internal pull-up resistor. 15 GND Power Connect to ground. 16 X2 Output Crystal connection. Leave unconnected for clock input. 2 MDS 650-40 C In te grated Circuit Systems ● 525 Ra ce Street, San Jose, CA 9512 6 Revision 060705 ● tel (4 08) 297-1 201 ● w w w. i c s t . c o m ICS650-40 ETHERNET SWITCH CLOCK SOURCE External Components A minimum number of external components are required for proper operation. Decoupling capacitors of 0.01 µF should be connected between VDD and GND pairs. The capacitors should be placed between pins VDD and GND, and VDDO and GND, as close to the device as possible. A 33Ω series terminating resistor should be used on each clock output if the trace is longer than 1 inch. A 25 MHz fundamental mode parallel resonant crystal should be used with CL=18 pF. On chip capacitors. On Chip capacitors are used for a 18 pF load crystal. Small 2 to 3 pf trimming capacitors are used from pins X1 to ground and X2 to ground to optimize the initial accuracy. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS650-40. 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 Power Supply Voltage (measured in respect to GND) Max. Units 0 +70 °C +3.15 +3.45 V 3 MDS 650-40 C In te grated Circuit Systems Typ. ● 525 Ra ce Street, San Jose, CA 9512 6 Revision 060705 ● tel (4 08) 297-1 201 ● w w w. i c s t . c o m ICS650-40 ETHERNET SWITCH CLOCK SOURCE DC Electrical Characteristics Unless otherwise specified, VDD=3.3 V ±5%, Ambient Temperature 0 to +70°C Parameter Symbol Operating Voltage Conditions Min. Typ. Max. Units VDD 3.15 3.45 V Output Operating Voltage VDDOA,B 2.375 3.45 V Input High Voltage, ICLK VIH Note 1 Input Low Voltage, ICLK VIL Note 1 Input High Voltage, S1:S0:OE VIH Input Low Voltage, S1:S0:OE VIL Output High Voltage VOH IOH = -12 mA Output Low Voltage VOL IOL = 12 mA Operating Supply Current IDD IDD at Output Disable Condition(OE low) Short Circuit Current IOS VDD/2+0.5 V VDD/2-0.5 2 V VDD V 0.4 V 2 V 0.4 V No load 40 mA No load 16 mA Each output ±35 mA Internal Pull-up Resistor RPUP OE pin 250 kΩ Internal Pull-down Resistor RPD CLK outputs 525 kΩ Note: 1. Nominal switching threshold is VDD/2. AC Electrical Characteristics , VDD = 3.3 V ±5%, VDDO = 2.5 - 3.3 V ±5%, CL=10 pF Ambient Temperature 0 to +70° C Parameter Symbol Conditions Min. Input Frequency Typ. Max. Units 25 MHz Output Rise Time tOR 20% to 80% of VDD 1.6 ns Output Fall Time tOF 80% to 20% of VDD 1.6 ns Output Clock Duty Cycle at VDD/2 Frequency Error all clocks 40 49-51 0 variation from mean Absolute Jitter, Short-term C-C Long-term Jitter 1000 clock cycles In te grated Circuit Systems 250 ps ±100 ±200 ps 200 400 ps 250 400 ps 4 MDS 650-40 C ● 525 Ra ce Street, San Jose, CA 9512 6 % ppm Output to Output Skew between clocks of the same frequency Absolute Jitter, Short-term P-P 60 Revision 060705 ● tel (4 08) 297-1 201 ● w w w. i c s t . c o m ICS650-40 ETHERNET SWITCH CLOCK SOURCE Thermal Characteristics (16-pin TSSOP) Parameter Symbol Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case Conditions Min. Typ. Max. Units θJA Still air 78 °C/W θJA 1 m/s air flow 70 °C/W θJA 3 m/s air flow 68 °C/W 37 °C/W θJC Marking Diagram Marking Diagram 16 16 9 ICS 650G40LF ICS 650G-40 ###### YYWW ###### YYWW 1 9 1 8 8 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. “LF” designates Pb (lead ) free package. 4. Bottom marking: (origin). Origin = country of origin if not USA. 5 MDS 650-40 C In te grated Circuit Systems ● 525 Ra ce Street, San Jose, CA 9512 6 Revision 060705 ● tel (4 08) 297-1 201 ● w w w. i c s t . c o m ICS650-40 ETHERNET SWITCH CLOCK SOURCE Package Outline and Package Dimensions (16-pin TSSOP, 173 Mil. Narrow Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters 16 Symbol Index Area E1 E IN D EX AR EA 1 E A A1 A2 b C D E E1 e L α aaa H 2 Pin 1 DD A 2 Min Inches Max -1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 4.90 5.1 6.40 BASIC 4.30 4.50 0.65 Basic 0.45 0.75 0° 8° -0.10 Min Max -0.047 0.002 0.006 0.032 0.041 0.007 0.012 0.0035 0.008 0.193 0.201 0.252 BASIC 0.169 0.177 0.0256 Basic 0.018 0.030 0° 8° -0.004 A A 1 c A -C - a c e e b b S E A T IN G P LA N E L L aaa C Ordering Information Part / Order Number Marking ICS650G-40 See Page 6 ICS650G-40T ICS650G-40LF Shipping Packaging Temperature Tubes 16-pin TSSOP 0 to +70° C Tape and Reel 16-pin TSSOP 0 to +70° C Tubes 16-pin TSSOP 0 to +70° C Tape and Reel 16-pin TSSOP 0 to +70° C See Page 6 ICS650G-40LFT Package Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. 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. 6 MDS 650-40 C In te grated Circuit Systems ● 525 Ra ce Street, San Jose, CA 9512 6 Revision 060705 ● tel (4 08) 297-1 201 ● w w w. i c s t . c o m