ICS553 LOW SKEW 1 TO 4 CLOCK BUFFER Description Features The ICS553 is a low skew, single input to four output, clock buffer. Part of ICS’ Clock BlocksTM family, this is our lowest skew, small clock buffer. See the ICS552-02 for a 1 to 8 low skew buffer. For more than 8 outputs see the MK74CBxxx Buffalo TM series of clock drivers. • • • • • • 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. Extremely low skew outputs (50ps maximum) Packaged in 8 pin SOIC Low power CMOS technology Operating Voltages of 2.5 to 5V Output Enable pin tri-states outputs 5V tolerant input clock Block Diagram Q0 Q1 IC LK Q2 Q3 O utput E nable 1 MDS 553 B In tegr ated C ir cu it S yst ems ● 5 25 Ra ce Str eet, San Jose, C A 95 126 Revision 052501 ● tel ( 408) 2 95-9 800 ● www. i c s t. c om ICS553 LOW SKEW 1 TO 4 CLOCK BUFFER Pin Assignment VDD Q0 Q1 1 2 3 8 7 6 OE Q3 Q2 GND 4 5 I CLK 8 Pi n (150 mi l) SOIC Pin Descriptions Pin Number Pin Name Pin Type Pin Description 1 VDD Power Connect to +2.5V, +3.3V or +5.0V. 2 Q0 Output Clock Output 0 3 Q1 Output Clock Output 1 4 GND Power Ground 5 ICLK Input Clock Input. 5V tolerant input. 6 Q2 Output Clock Output 2 7 Q3 Output Clock Output 3 8 OE Input Output Enable. Tri-states outputs when low. External Components A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01 µF should be connected between VDD on pin 1 and GND on pin 4, as close to the device as possible. A 33 Ω series terminating resistor may be used on each clock output if the trace is longer than 1 inch. To achieve the low output skew that the ICS553 is capable of, careful attention must be paid to board layout. Essentially, all 4 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. 2 MDS 553 B Int egrat ed C ircuit Syste ms ● 525 R ace S tr eet, San Jose, CA 95126 Revision 052501 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m ICS553 LOW SKEW 1 TO 4 CLOCK BUFFER Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS553. 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 Min. Typ. Max. Units 0 – +70 °C +5.25 V Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) +2.375 DC Electrical Characteristics VDD=2.5V ±5%, Ambient temperature 0 to +70°C, unless stated otherwise Parameter Symbol Operating Voltage Conditions Max. Units 2.375 2.625 V VDD/2+0.5 5.5 V VDD/2-0.5 V VDD V 0.4 V VDD Input High Voltage, ICLK VIH Note 1 Input Low Voltage, ICLK VIL Note 1 Input High Voltage, OE VIH Input Low Voltage, OE VIL Output High Voltage VOH IOH = -16 mA Output Low Voltage VOL IOL = 16 mA Operating Supply Current IDD No load, 135 MHz Short Circuit Current IOS Typ. 2 2 V 0.5 ● 525 R ace S tr eet, San Jose, CA 95126 V 25 mA ±28 mA 3 MDS 553 B Int egrat ed C ircuit Syste ms Min. Revision 052501 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m ICS553 LOW SKEW 1 TO 4 CLOCK BUFFER DC Electrical Characteristics (continued) VDD=3.3V ±5% , Ambient temperature 0 to +70°C, unless stated otherwise Parameter Symbol Operating Voltage Conditions Min. Max. Units 3.15 3.45 V VDD/2+0.7 5.5 V VDD/2-0.7 V VDD V 0.4 V VDD Input High Voltage, ICLK VIH Note 1 Input Low Voltage, ICLK VIL Note 1 Input High Voltage, OE VIH Input Low Voltage, OE VIL Output High Voltage VOH IOH = -25 mA Output Low Voltage VOL IOL = 25 mA Output High Voltage (CMOS Level) VOH IOH = -12 mA Operating Supply Current IDD No load, 135 MHz Short Circuit Current IOS Typ. 2 2.4 V 0.8 VDD-0.4 V V 35 mA ±50 mA VDD=5V ±5% , Ambient temperature 0 to +70°C, unless stated otherwise Parameter Symbol Operating Voltage Conditions Min. Max. Units 4.75 5.25 V VDD/2+1 5.5 V VDD/2-1 V VDD V 0.4 V VDD Input High Voltage, ICLK VIH Note 1 Input Low Voltage, ICLK VIL Note 1 Input High Voltage, OE VIH Input Low Voltage, OE VIL Output High Voltage VOH IOH = -45 mA Output Low Voltage VOL IOL = 45 mA Output High Voltage (CMOS Level) VOH IOH = -12 mA Operating Supply Current IDD No load, 135 MHz Short Circuit Current IOS Typ. 2 2.4 V 0.8 VDD-0.4 V V 50 mA ±80 mA Notes: 1. Nominal switching threshold is VDD/2 4 MDS 553 B Int egrat ed C ircuit Syste ms ● 525 R ace S tr eet, San Jose, CA 95126 Revision 052501 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m ICS553 LOW SKEW 1 TO 4 CLOCK BUFFER AC Electrical Characteristics VDD = 2.5V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Min. Input Frequency Typ. 0 Output Rise Time tOR Output Fall Time tOF Propagation Delay Note 1 Output to output skew Note 2 0.8 to 2.0V, CL=15pF 2.0 to 0.8V, CL=15pF Max. Units 200 MHz 1.5 ns 1.5 ns 3 Rising edges at VDD/2 ns 0 50 ps VDD = 3.3V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Min. Input Frequency Typ. 0 Output Rise Time tOR Output Fall Time tOF Propagation Delay Note 1 Output to output skew Note 2 0.8 to 2.0V, CL=15pF 2.0 to 0.8V, CL=15pF Max. Units 200 MHz 1.0 ns 1.0 ns 2.6 Rising edges at VDD/2 ns 0 50 ps VDD = 5V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Min. Input Frequency Typ. 0 Output Rise Time tOR Output Fall Time tOF Propagation Delay Note 1 Output to output skew Note 2 0.8 to 2.0V, CL=15pF 2.0 to 0.8V, CL=15pF Max. Units 200 MHz 0.7 ns 0.7 ns 2.5 Rising edges at VDD/2 ns 0 50 ps Notes: 1. With rail to rail input clock 2. Between any 2 outputs with equal loading. 3. Duty cycle on outputs will match incoming clock duty cycle. Consult ICS for tight duty cycle clock generators. 5 MDS 553 B Int egrat ed C ircuit Syste ms ● 525 R ace S tr eet, San Jose, CA 95126 Revision 052501 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m ICS553 LOW SKEW 1 TO 4 CLOCK BUFFER Package Outline and Package Dimensions (8 pin SOIC, 150 Mil. Narrow Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters In d e x A re a Symbol Min Max Min Max A 1.35 1.75 0.0532 0.0688 A1 1.10 0.25 0.0040 0.0098 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.0075 0.0098 D 4.80 5.00 .1890 .1968 E 3.80 4.00 0.1497 0.1574 e E P in 1 H Inches 1.27 Basic 0.050 Basic H 5.80 6.20 0.2284 0.2440 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 a 0° 8° 0° 8° h x 450 D A Q c e b Ordering Information Part / Order Number Marking Shipping packaging Package Temperature ICS553M ICS553MT ICS553M ICS553M Tubes Tape and Reel 8 pin SOIC 8 pin SOIC 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. 6 MDS 553 B Int egrat ed C ircuit Syste ms ● 525 R ace S tr eet, San Jose, CA 95126 Revision 052501 ● t el (40 8) 295 -9800 ● w ww. ic s t .c o m