DATASHEET ICS554-01A LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT Description Features The ICS554-01A is a low skew clock buffer with a single complimentary PECL input to four PECL outputs. Part of IDT's Clock BlocksTM family, this is our lowest skew PECL clock buffer. The ICS554-01A is footprint compatible with the ICS554-01, but requires fewer passive components for termination thus providing a cost-saving alternative. For parts which do not require PECL inputs or outputs, see the ICS553 for a 1 to 4 low skew buffer, or the ICS552-02 for a 1 to 8 low skew buffer. For more than 8 outputs see the MK74CBxxx BuffaloTM series of clock drivers. * * * * * * * * * IDT makes many non-PLL and PLL based low skew output devices as well as Zero Delay Buffers to synchronize clocks. Contact us for all of your clocking needs. Input frequency up to 200 MHz Advanced CMOS process Outputs are skew matched to within 50 ps Packaged in 16-pin TSSOP One PECL input to 4 PECL output clock drivers Operating Voltages of 3.3 V or 5 V Industrial temperature range Functional equivalent to ICS554-01 Simplified passive termination network compared to ICS554-01 NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 Block Diagram VDD IN Q0 IN Q0 Q1 Q1 Q2 Q2 Q3 Q3 VSS IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT 1 ICS554-01A REV C 092309 ICS554-01A LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT PECL BUFFER Pin Assignment NC 1 16 NC VDD 2 15 VDD Q0 3 14 Q3 Q0 4 13 Q3 Q1 5 12 Q2 Q1 6 11 Q2 GND 7 10 GND IN 8 9 IN 16-pin 173 mil (0.65mm) TSSOP Pin Descriptions Number Name Type Pin Description 1 NC -- 2 VDD Power Connect to +3.3 V or 5 V. Must be same as pin 15. 3 Q0 Output Clock Output Q0. 4 Q0 Output Clock Output Q0. 5 Q1 Output Clock Output Q1. 6 Q1 Output Clock Output Q1. 7 GND Power Connect to Ground. 8 IN Input PECL Clock Input. 9 IN Input Complementary PECL Clock Input. 10 GND Power Connect to Ground 11 Q2 Output Clock Output Q2. 12 Q2 Output Clock Output Q2. 13 Q3 Output Clock Output Q3. 14 Q3 Output Clock Output Q3. 15 VDD Power Connect to +3.3 V or 5 V. Must be same as pin 2. 16 NC -- No Connect. No Connect. IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT 2 ICS554-01A REV C 092309 ICS554-01A LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT PECL BUFFER External Components The ICS554-01A requires a decoupling capacitor of 0.01F to be connected between VDD on pin 2 and GND on pin 7, as well as between VDD on pin 15 and GND on pin 10. These decoupling capacitors should be placed as close to the device as possible. To achieve the low output skews that the ICS554-01A is capable of, careful attention must be paid to board layout. Essentially, all 8 outputs must have identical terminations, loads, and trace geometries. If they do not, the output skew will be degraded. For example, using a 30 series termination on one output (with 33 on the others) will cause at least 15ps of skew. Termination for PECL or LVPECL Outputs The clock layout topology shown below is a typical termination for PECL or LVPECL outputs. The two different layouts mentioned are recommended only as guidelines. FOUT and nFOUT are low impedance follower outputs that generate PECL/LVPECL compatible outputs. Therefore, termination resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed to drive 50 ohm transmission lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. There are a few simple termination schemes. The figures below show two different layouts which are recommended only as guidelines. Other suitable clock layouts may exist, but it is recommended that board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. Z0 = 50 ohms FOUT 3.3 V FIN Z0 = 50 ohms 5 50 ohms 50 ohms 2 Z0 5 2 Z0 Z0 = 50 ohms C1 RTT = 1 (VOH + VOL / VCC -2) -2 RTT FOUT FIN Z0 = 50 ohms Z0 3 2 Z0 3 2 Z0 C1 = 0.1F to 0.01F PECL or LVPECL Output Termination LVPECL Output Termination IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT 3 ICS554-01A REV C 092309 ICS554-01A LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT PECL BUFFER Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS554-01A. These ratings, which are standard values for IDT 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 -40 to +85 C Storage Temperature -65 to +150 C Junction Temperature 125 C Soldering Temperature 260 C Recommended Operation Conditions Parameter Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT 4 Min. Typ. Max. Units -40 - +85 C +5.25 V +3.15 ICS554-01A REV C 092309 ICS554-01A LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT PECL BUFFER DC Electrical Characteristics VDD=3.3 V 5% Ambient temperature -40 to +85 C Parameter Operating Voltage Symbol Conditions Min. Typ. Max. Units VDD 3.15 5.25 V Peak to Peak Input Voltage IN 0.3 1.0 V Input Common Mode Range IN VDD=3.3 V VDD-2 VDD-0.6 Input Common Mode Range IN VDD=5 V VDD-3.7 VDD-0.6 VDD-1.2 Output High Voltage VOH Note 1 Output Low Voltage VOL Note 1 Operating Supply Current IDD No Load, 135 MHz Short Circuit Current, 3.3 V Short Circuit Current, 5 V V VDD - 2.0 V 80 mA IOS 50 mA IOS 60 mA Note 1: VOH and VOL can be set by the external resistor values on the PECL outputs. note 2: IDD includes the current through the external resistors which can be modified. AC Electrical Characteristics VDD = 3.3 V 5, Ambient Temperature -40 to +85 C Parameter Symbol Conditions Input Frequency Propagation Delay Min. Typ. 0 Max. Units 200 MHz VDD = 3.3 V 2 ns VDD = 5 V 2 ns Output to Output Skew Crosspoint of pair 0 50 ps Duty Cycle Crosspoint of pair 50 55 % IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT 5 45 ICS554-01A REV C 092309 ICS554-01A LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT PECL BUFFER Package Outline and Package Dimensions (16-pin TSSOP, 4.40 mm Body, 0.65 mm Pitch) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters 16 Symbol E1 A A1 A2 b C D E E1 e L aaa E IN D EX AR EA 1 2 D 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 -C e S E A T IN G P LA N E b L aaa C Ordering Information Part / Order Number 554G-01AI* 554G-01AIT* 554G-01AILF 554G-01AILFT Marking 554G01AI 554G1AIL Shipping Packaging Package Temperature Tubes Tape and Reel Tubes Tape and Reel 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C *NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT 6 ICS554-01A REV C 092309 ICS554-01A LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT PECL BUFFER Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales For Tech Support 800-345-7015 408-284-8200 Fax: 408-284-2775 www.idt.com/go/clockhelp Corporate Headquarters Integrated Device Technology, Inc. www.idt.com (c) 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA