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| ICS421-05 DIGITAL VIDEO CAMERA CLOCK Description The ICS421-05 is a low-power, low-jitter clock synthesizer developed for digital camera applications. The device accepts a 27 MHz input clock to support common digital video camera interface frequencies including a 12 MHz for USB, 24.576 MHz for IEEE1394, and a 72 MHz CCD clock. Power consumption was minimized by lowering the voltage requirement to 1.8 V minimum. The ICS421-05 utilizes a small form factor 8-pin TSSOP package. ICS is a leader in low power, consumer application clock sources. Devices are capable of supporting CCD, video, audio, USB, CPU, and other peripherals. Features * * * * * * * Ultra-low operating voltage from 1.8 V to 2.4 V 10 mA supply current 27 MHz input clock frequency Fixed 24.576 MHz clock supports IEEE1394 Fixed 12 MHz clock supports USB Fixed 72 MHz CCD clock Packaged in 8-pin TSSOP (Pb free) Block Diagram VDD 2 IEEE PLL Clock Buffer CCD/ USB PLL 1 GND OE_USB 72M 12M 24.576M 27 MHz Input Clock CLKIN MDS 421-05 B I nt eg ra te d C ir c uit S y s t em s 1 525 Ra ce St reet, San Jose, C A 95 126 Revision 072304 tel (40 8) 2 97-12 01 w w w. i c st . c o m ICS421-05 DIGITAL VIDEO CAMERA CLOCK Pin Assignment CLKIN VDD GND 24.576M 1 2 3 4 8 7 6 5 OE_USB 12M VDD 72M OE_USB Operation Table OE_USB Function 0 1 Output tri-state Output running 8 pin (173 mil) TSSOP Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 Pin Name CLKIN VDD GND 24.576M 72M VDD 12M OE_USB Pin Type Input Power Power Output Output Power Output Input Pin Description 27 MHz single ended clock input. Connect to voltage supply. Connect to ground. 24.576 MHz clock output. 72 MHz clock output for CCD. Connect to voltage supply. 12 MHz clock output for USB. Output enable for 12M clock for USB. See table for functionality, internal pull-down. External Components Series Termination Resistor Clock output traces over one inch should use series termination. To series terminate a 50 trace (a commonly used trace impedance), place a 33 resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20. 1) The 0.01F decoupling capacitor should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between decoupling capacitor and VDD pin. The PCB trace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. Distance of the ferrite bead and bulk decoupling from the device is less critical. 2) To minimize EMI, the 33 series termination resistor (if needed) should be placed close to the clock output. 3) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers (the ferrite bead and bulk decoupling capacitor can be mounted on the back). Other signal traces should be routed away from the ICS421-05. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. Decoupling Capacitor As with any high-performance mixed-signal IC, the ICS421-05 must be isolated from system power supply noise to perform optimally. A decoupling capacitor of 0.01F must be connected between VDD and the PCB ground plane. PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following guidelines should be observed. MDS 421-05 B In te grated Circui t Systems 2 52 5 R ace St reet, San Jose , CA 9 5126 Revision 072304 te l (4 08) 297 -1 201 www.icst.com ICS421-05 DIGITAL VIDEO CAMERA CLOCK Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS421-05. 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 Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature -0.5 V to 7 V Rating -0.5 V to VDD +0.5 V 0 to +70 C -65 to +150 C 125 C 260 C Recommended Operating Conditions Parameter Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Min. 0 +1.8 Typ. - Max. +70 +2.4 Units C V DC Electrical Characteristics VDD = 1.8 V to 2.4 V, Ambient Temperature 0 to +70C, unless stated otherwise Parameter Operating Voltage Input High Voltage Input Low Voltage Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage Output High Voltage Output Low Voltage Operating Supply Current Symbol VDD VIH VIL VIH VIL VOH VOL VOH VOL IDD Conditions CLKIN CLKIN OE_USB pin OE_USB pin VDD = 2.4 V, IOH = -4 mA VDD = 2.4 V, IOL = 4 mA VDD = 1.8 V IOH = -4 mA VDD = 1.8 V IOL = 4 mA No load, 3 out Min. 1.80 VDD/2+0.5 Typ. Max. 2.40 VDD/2-0.5 Units V V V V V V TBD TBD 1.9 0.4 1.4 0.4 10 V V V mA MDS 421-05 B In te grated Circui t Systems 3 52 5 R ace St reet, San Jose , CA 9 5126 Revision 072304 te l (4 08) 297 -1 201 www.icst.com ICS421-05 DIGITAL VIDEO CAMERA CLOCK Parameter Short Circuit Current Nominal Output Impedance Symbol IOS Zo Conditions Each output Min. Typ. 50 20 150 Max. Units mA W k On-chip Pull-down Resistor OE_USB Notes: 1. Nominal switching threshold is VDD/2 AC Electrical Characteristics VDD = 1.8 V to 2.4 V, Ambient Temperature 0 to +70C, unless stated otherwise Parameter Input Frequency Output Rise Time Output Fall Time Output Rise Time Output Fall Time Output Clock Duty Cycle Absolute Pk-Pk Jitter PLL Lock Time within 1% Symbol tOR tOF tOR tOF Conditions Clock Input VDD=2.4 V, 20% to 80%, CL=10 pF VDD=2.4 V, 80% to 20%, CL=10 pF VDD=1.8 V, 20% to 80%, CL=10 pF VDD=1.8 V, 80% to 20%, CL=10 pF at VDD/2 72 MHz output clock Power OFF to lock Min. Typ. 27 1.8 1.8 2.5 2.5 50 200 Max. Units MHz ns ns ns ns % ps 10 ms Thermal Characteristics Parameter Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case Symbol JA JA JA JC Conditions Still air 1 m/s air flow 3 m/s air flow Min. Typ. 110 100 80 35 Max. Units C/W C/W C/W C/W Marking Diagram 8 5 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. "L" designates Pb (lead) free package. YYWW 21G5L ###### 1 4 MDS 421-05 B In te grated Circui t Systems 4 52 5 R ace St reet, San Jose , CA 9 5126 Revision 072304 te l (4 08) 297 -1 201 www.icst.com ICS421-05 DIGITAL VIDEO CAMERA CLOCK Package Outline and Package Dimensions (8-pin TSSOP, 173 Mil. Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters Symbol Min Max Inches Min Max 8 INDEX AREA E1 E 1 D A A1 A2 b C D E E1 e L aaa -1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 2.90 3.10 6.40 BASIC 4.30 4.50 0.65 Basic 0.45 0.75 0 8 -0.10 -0.047 0.002 0.006 0.032 0.041 0.007 0.012 0.0035 0.008 0.114 0.122 0.252 BASIC 0.169 0.177 0.0256 Basic 0.018 0.030 0 8 -0.004 A2 A1 A c - Ce b SEATING PLANE aaa C L Ordering Information Part / Order Number ICS421G-05LF ICS421G-05LFT Marking 21G5L Shipping Packaging Tubes Tape & Reel Package 8-pin TSSOP 8-pin TSSOP Temperature 0 to +70 C 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. MDS 421-05 B In te grated Circui t Systems 5 52 5 R ace St reet, San Jose , CA 9 5126 Revision 072304 te l (4 08) 297 -1 201 www.icst.com |
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