PRELIMINARY INFORMATION ICS551 1 to 4 Clock Buffer Description Features The ICS551 is a low cost, high speed single input to four output clock buffer. Part of ICS’ Clock Blocks TM family, this is our lowest cost, small clock buffer. See the ICS552-01B for a monolithic dual version of the ICS551 in a 20 pin QSOP. • Packaged in 8 pin SOIC • Low cost clock buffer • Low skew (250ps) outputs • Input/output clock frequency up to 160 MHz • Operating voltages of 3.0 to 5.5 V • Non-inverting • Ideal for networking clocks • Output Enable mode tri-states outputs • Full CMOS clock swings with 25mA drive capability at TTL levels • Advanced, low power CMOS process 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 Q1 Q2 ICLK Q3 Q4 Output Enable 1 Revision 091200 Printed 11/14/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 551 B PRELIMINARY INFORMATION ICS551 1 to 4 Clock Buffer Pin Assignment ICLK 1 8 OE Q1 2 7 VDD Q2 3 6 GND Q3 4 5 Q4 8 pin SOIC Pin Descriptions Number 1 2 3 4 5 6 7 8 Name ICLK Q1 Q2 Q3 Q4 GND VDD OE Type CI O O O O P P I Description Clock input. Internal pull-up resistor. Clock Output 1. Clock Output 2. Clock Output 3. Clock Output 4. Connect to ground. Connect to +3.3 V or +5.0 V. Output Enable. Tri-states outputs when low. Internal pull-up resistor. Key: CI = clock input, I = input, O = output, P = power supply connection 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 7 and GND on pin 6, and a 33 Ω terminating resistor may be used on each clock output if the trace is longer than 1 inch. 2 Revision 091200 Printed 11/14/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 551 B PRELIMINARY INFORMATION ICS551 1 to 4 Clock Buffer Electrical Specifications Parameter Conditions Minimum Typical Maximum Units 7 VDD+0.5 70 260 150 V V °C °C °C 5.5 V V V V V V V V mA mA kΩ ABSOLUTE MAXIMUM RATINGS (note 1) Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Referenced to GND Referenced to GND -0.5 0 Max of 20 seconds -65 DC CHARACTERISTICS Operating Voltage, VDD Input High Voltage, VIH, IN Input Low Voltage, VIL, In Input High Voltage, VIH, OE Input Low Voltage, VIL, OE Output High Voltage, VOH, 5V Output Low Voltage, VOL, 5V Output High Voltage, VOH, CMOS level Operating Supply Current, IDD, 3.3V Short Circuit Current, 3.3 V Internal pull-up resistor Clock input Clock input 3 VDD/2 + 1 VDD/2 VDD/2 VDD/2 - 1 2 0.8 IOH=-25mA IOL=25mA IOH=-8mA No load, 135 MHz Each output All inputs 2.4 0.4 VDD-0.4 18 ±50 200 AC CHARACTERISTICS Input Frequency Output Frequency, 3.3 V Output Frequency, 5 V Output Clock Rise Time Output Clock Fall Time Propagation Delay Output to output skew Notes: 0 15 pF load. Note 3. 15 pF load. Note 3. 0.8 to 2.0V 2.0 to 0.8V At 3.3 V At 5.0 V Rising edges at VDD/2 2 1.5 4 3 160 160 135 1.5 1.5 8 6 250 MHz MHz MHz ns ns ns ns ps 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability. 2. Duty cycle on outputs will match incoming clock duty cycle. Consult ICS for tight duty cycle clock generators. 3. With external series resistor of 33 Ω positioned close to each output pin. 3 Revision 091200 Printed 11/14/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 551 B PRELIMINARY INFORMATION ICS551 1 to 4 Clock Buffer Package Outline and Package Dimensions 8 pin SOIC E H Pin 1 h x 45° D Q A c e b L Symbol A b D E H e h L Q Inches Min Max 0.055 0.068 0.013 0.019 0.185 0.200 0.150 0.160 0.225 0.245 .050 BSC 0.015 0.016 0.035 0.004 0.01 Millimeters Min Max 1.397 1.7272 0.330 0.483 4.699 5.080 3.810 4.064 5.715 6.223 1.27 BSC 0.381 0.406 0.889 0.102 0.254 Ordering Information Part/Order Number ICS551M ICS551MT Marking ICS551M ICS551M Package 8 pin SOIC 8 pin SOIC on tape and reel Temperature 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. ClockBlocks is a trademark of ICS 4 Revision 091200 Printed 11/14/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax MDS 551 B