ICS554-01 P R E L I M I N A RY I N F O R M AT I O N LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT Description Features The ICS554-01 is a low skew clock buffer with a single complimentary PECL input to four PECL outputs. Part of ICS’ Clock BlocksTM family, this is our lowest skew PECL clock buffer. 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. • • • • Outputs are skew matched to within 50ps Packaged in 16 pin TSSOP One PECL input to 4 PECL output clock drivers Operating Voltages of 3.3V to 5V ICS 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. Block Diagram VDD 62Ω 62Ω IN Q0 IN 270Ω Q0 270Ω VDD 62Ω 62Ω Q1 270Ω VDD 62Ω Q1 270Ω 62Ω Q2 270Ω Q2 270Ω VDD 62Ω 62Ω Q3 270Ω VDD Q3 270Ω 1.1kΩ 0.01mF RES 1 MDS 554-01 A In tegr ated C ir cu it S y st ems ● 5 25 Ra ce Str eet, San Jose, C A 95 126 Revision 031901 ● tel ( 408) 2 95-9 800 ● www. i c s t. c om ICS554-01 P R E L I M I N A RY I N FO R M ATI O N LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT Pin Assignment NC VDD Q0 Q0 Q1 Q1 GND IN 1 2 3 4 5 6 7 8 RES VDD Q3 Q3 Q2 Q2 GND IN 16 15 14 13 12 11 10 9 1 6 P in T S S O P Pin Descriptions Pin Number Pin Name Pin Type - Pin Description 1 NC 2 VDD Power Connect to +2.5 V, +3.3V or +5.0V. Must be the 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 Ground 8 IN Input PECL Clock Input 9 IN Input Complementary PECL Clock Input 10 GND Power 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 +2.5V, +3.3V or +5.0V. Must be the same as pin 2 16 RES Input Bias Resistor Input. 2 MDS 554-01 A Int egrat ed C ircuit Syste ms No Connect. ● 525 R ace S tr eet, San Jose, CA 95126 Revision 031901 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m ICS554-01 P R E L I M I N A RY I N FO R M ATI O N LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT External Components The ICS554-01 requires a decoupling capacitor of 0.01µF 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. A 0.01µF capacitor must be placed between the RES (pin 16) and Ground, also, a resistor must be connected between the RES (pin 16) and VDD. Another eight resistors are needed for the PECL outputs as shown on the block diagram on page 1. Suggested values of these resistors are shown in the Block Diagram, but they can be varied to change the differential pair output swing, and the DC level. Refer to Application Note, MAN09. To achieve the low output skews that the ICS554-01 is capable of, careful attention must be paid to board layout. Essentially, all 8 outputs must have identical terminations, identical loads, and identical trace geometries. If they do not, the output skew will be degraded. For example, using a 30Ω series termination on one output (with 33Ω on the others) will cause at least 15ps of skew. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS554-01. 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 -0.5V to VDD+0.5V Ambient Operating Temperature 0 to +70°C Storage Temperature -65 to +150°C Junction Temperature 175°C Soldering Temperature 260°C Recommended Operation Conditions Parameter Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Typ. Max. Units 0 – +70 °C +5.25 V +3.15 3 MDS 554-01 A Int egrat ed C ircuit Syste ms Min. ● 525 R ace S tr eet, San Jose, CA 95126 Revision 031901 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m ICS554-01 P R E L I M I N A RY I N FO R M ATI O N LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT DC Electrical Characteristics VDD=3.3V ±5%, Ambient temperature 0 to +70°C, unless stated otherwise Parameter Symbol Operating Voltage 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=3.3V VDD-2.0 VDD-0.6 V Input Common Mode Range IN VDD=5V VDD-3.7 VDD-0.6 V Input High Voltage, OE VIH – 2 – VDD V Input Low Voltage, OE VIL – – – 0.4 V Output High Voltage VOH Note 1 VDD-1.2 Output Low Voltage VOL Note 1 – Operating Supply Current IDD No load, 135 MHz Short Circuit Current, 2.5V V – VDD-2.0 V 67 mA IOS ±40 mA Short Circuit Current, 3.3V IOS ±50 mA Short Circuit Current, 5V IOS ±60 mA Notes: 1. VOH and VOL can be set by the external resistor values on the PECL outputs. 2. IDD includes the current through the external resistors which can be modified. AC Electrical Characteristics VDD = 3.3V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Min. Input Frequency Typ. 0 Max. Units 200 MHz Propagation Delay (VDD=3.3V) 4 ns Propagation Delay (VDD=5V) 3 ns Output to output skew. 0 50 4 MDS 554-01 A Int egrat ed C ircuit Syste ms Crossing point of pair ● 525 R ace S tr eet, San Jose, CA 95126 ps Revision 031901 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m ICS554-01 P R E L I M I N A RY I N FO R M ATI O N LOW SKEW 1 TO 4 CLOCK BUFFER PECL IN, PECL OUT Package Outline and Package Dimensions (16 pin TSSOP, 173 Mil. Narrow Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters E H Inches Symbol Min Max Min Max A -- 1.20 -- 0.047 a 0.05 0.15 0.002 0.006 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.0035 0.008 D 4.90 5.10 0.193 0.201 E 4.30 4.50 0.169 0.177 e 0.65 Basic 0.0256 Basic H 6.40 Basic 0.252 Basic L 0.45 0.75 0.018 0.030 D a e b A c L Ordering Information Part / Order Number Marking (both) Shipping packaging Package Temperature ICS554G-01 ICS554G-01T ICS (top line) 554G-01 (2nd line) Tubes Tape and Reel 16 pin TSSOP 16 pin TSSOP 0 to +70° C 0 to +70° C 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. 5 MDS 554-01 A Int egrat ed C ircuit Syste ms ● 525 R ace S tr eet, San Jose, CA 95126 Revision 031901 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m