MK74CB115 ICST | Alldatasheet

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Technical content

1 to 16 Buffalo™ Clock Driver Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com

  • Tiny 28 pin SSOP (150 mil) package
  • One input to sixteen output clock drivers
  • Outputs are skew matched to within 250 ps
  • 3.3V±10% or 5V±10% supply voltage
  • 3 Output Enables allow configuration as 1 to 4, 1 to 6, 1 to 10, 1 to 12 or 1 to 16 buffer
  • Clock speeds up to 200 MHz The MK74CB115 Buffalo™ is a monolithic CMOS high speed clock driver. It consists of a single input to sixteen low-skew output, non- inverting clock drivers. The chip is capable of driving 16 CMOS loads up to 200 MHz with a maximum of 250 ps output to output skew. The MK74CB115 is packaged in the tiny 28 pin SSOP, which uses the same board space as the narrow 16 pin SOIC. GND Q15 Block Diagram Description Features Family of ICS Parts The MK74CB115 Buffalo™ is designed to be used with ICS’s clock synthesizer devices. The inputs of the Buffalo are matched to the outputs of ICS clock synthesizers. Consult ICS for applications support. Q14 Q13 Q12 Q11 Q10 IN OE0 OE1 OE2 VDD

1 to 16 Buffalo™ Clock Driver Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com Number Name Type Description 1 OE1 I Output Enable. Tri-states Q2 to Q7 clock outputs when this input is low. Internal pull-up. 2, 3 Q0, Q1 O Clock outputs. 4, 7, 8 Q2, Q3, Q4 O Clock outputs. 5, 6 VDD P Power supply. Connect to +3.3 V or 5 V. 9, 10 GND P Connect to ground. 11, 12, 13 Q5, Q6, Q7 O Clock outputs. 14 IN I Clock input for 16 buffers. 15 OE0 I Output Enable. Tri-states Q8 to Q13 clock outputs when this input is low. Internal pull-up. 16, 17, 18 Q8, Q9, Q10 O Clock outputs. 19, 20 GND P Connect to ground. 21, 22, 25 Q11, Q12, Q13 O Clock outputs. 23, 24 VDD P Power supply. Connect to +3.3 V or 5 V. 26, 27 Q14, Q15 O Clock outputs. OE2 I Output Enable. Tri-states Q0, Q1, Q15 and Q14 clock outputs when this input is low. Internal pull-up. Pin Descriptions Type: I = Input, O = output, P = power supply connection Pin Assignment OE1 GND GND IN VDD VDD Q15 Q14 Q13 Q12 Q11 Q10 OE2 GND GND OE0 VDD VDD Suggested Layout V G G V For simplicity, series terminating resistors (required) are not shown for the outputs, but should be placed as close to the device as possible. It is most critical to have the 0.1µF decoupling capacitors closest. V = connect to VDD = connect to GNDG 0.1µF0.1µF

1 to 16 Buffalo™ Clock Driver Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com Parameter Conditions Minimum Typical Maximum Units ABSOLUTE MAXIMUM RATINGS (Note 1) ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage, VDD Referenced to GND 7 V Inputs Referenced to GND 0.5 VDD+0.5 V Clock Outputs Referenced to GND 0.5 VDD+0.5 V Ambient Operating Temperature 0 70 °C Soldering Temperature Max of 20 seconds 260 °C Storage Temperature -65 150 °C DC CHARACTERISTICS (VDD = 3.3 V unless noted)DC CHARACTERISTICS (VDD = 3.3 V unless noted) Operating Voltage, VDD 3.0 3.3 5.5 V Input High Voltage, VIH (IN pin) Input clock (VDD/2)+1 VDD/2 V Input Low Voltage, VIL (IN pin) Input clock VDD/2 (VDD/2)-1 V Input High Voltage, VIH (OE pins) 2.0 V Input Low Voltage, VIL (OE pins) 0.8 V Output High Voltage, 3.3V IOH=-8mA VDD-0.4 V Output High Voltage, 3.3V IOH=-12mA 2.4 V Output Low Voltage, 3.3V IOL=12mA 0.8 V Operating Supply Current, IDD, at 100 MHz No Load 55 mA Output Impedance 14 Ω Short Circuit Current, 3.3V Each output ±50 mA On-Chip Pull-up Resistor OE0, OE1, OE2 250 kΩ Input Capacitance 5 pF AC CHARACTERISTICS (VDD = 3.3 V unless noted)AC CHARACTERISTICS (VDD = 3.3 V unless noted) Input Clock Frequency with load = 8 pF Note 4, 5 0 200 MHz Propagation Delay with load = 15pF 1.4 3 ns Output Clock Rise Time 0.8 to 2.0V 2 ns Output Clock Fall Time 2.0 to 0.8V 2 ns Output Clock Rising Edge Skew At VDD/2. Note 2 100 250 ps Output Enable Time, OE high to output on 20 ns Output Disable Time, OE low to tri-state 20 ns Electrical Specifications Notes: 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. Between any two outputs, with equal loading. 3. At VDD = 3.3 V, 70°C, series termination of 33 Ω per pin , 8 pF load per pin. 4. See discussion and graph of speed versus load, Graph 1 on following page.

1 to 16 Buffalo™ Clock Driver Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com Maximum Speed/Application Notes The maximum speed at which the chip can operate is limited by power dissipation of the package. Graph 1 shows the operating frequency plotted against load capacitance per pin for a die temperature of 125°C. This is at VDD = 3.3 V, 70°C and with 33 Ω series termination resistor. The termination resistors are essential because they allow a large proportion of the total power to be dissipated outside the package. Reducing or eliminating the series termination will cause an increase in die temperature. It is not recommended to operate the chip at die temperature greater than 125°C. Also note that the load capacitance per pin must include PC board parasitics such as trace capacitance. ICS has other buffers specified to 250 MHz with heavier loads. If not all outputs of the chip are used, it is possible to operate the chip faster with larger loads. Unused outputs should be left unconnected. Consult ICS for your specific requirement. 300 250 200 150 100 806040200 Do not operate in this area . Load Capacitance/per pin (pF), all 16 outputs loaded Graph 1 MK74CB115 Maximum Speed at 3.3 V

1 to 16 Buffalo™ Clock Driver Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com

Ordering Information

While the information presented herein has been checked for both accuracy and reliability, ICS Incorporated 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. Buffalo is a trademark of ICS Incorporated Part/Order Number Marking Package Temperature MK74CB115R MK74CB115R 28 pin SSOP 0-70°C MK74CB115RTR MK74CB115R Add Tape & Reel 0-70°C 28 pin SSOP Inches Inches Millimeters Millimeters Symbol Min Max Min Max A 0.053 0.069 1.35 1.75 A1 0.004 0.010 0.102 0.254 b 0.008 0.012 0.203 0.305 c 0.007 0.010 0.191 0.254 D 0.386 0.394 9.804 10.008 e .025 BSC .025 BSC 0.635 BSC 0.635 BSC E 0.228 0.244 5.791 6.198 E1 0.150 0.157 3.810 3.988 L 0.016 0.050 0.406 1.270 Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.) b D E1 E e A1 c A L INDEX AREA 1 2