MK74CB218 ICST | Alldatasheet

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Dual 1 to 8 Buffalo™ Clock Driver IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com PRELIMINARY INFORMATION

  • Tiny 28 pin SSOP (150 mil) package
  • Dual one input to eight output clock drivers
  • Outputs are skew matched to within 250 ps
  • A outputs and B outputs matched to 250 ps
  • 2.5 V, 3.3 V or 5 V supply voltages
  • Output Enable tri-states each bank of eight
  • Clock speeds up to 200 MHz The MK74CB218 Buffalo™ is a monolithic CMOS high speed clock driver. It consists of two identical single input to eight low-skew output, non-inverting clock drivers. This eliminates concerns of part to part matching in many systems. The MK74CB218 is packaged in the tiny 28 pin SSOP, which uses the same board space as the narrow 16 pin SOIC. The inputs can be connected together for a 1 to 16 fanout buffer. A quad 1 to 4, and PECL versions, are also available. Consult ICS for more details. The MK74CB218 can also act as a voltage translator, since it is possible to run the inputs at 3.3 V and the outputs at 2.5 V. QB0 Block Diagram Description Features Family of ICS Parts The MK74CB218 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. QB1 QB2 QB3 QB4 QB5 QB7 QB6 INB OE (all outputs) QA0 QA1 QA2 QA3 QA4 QA5 QA7 QA6 INA VDD GND VDDVDDA VDDB

Dual 1 to 8 Buffalo™ Clock Driver IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com PRELIMINARY INFORMATION Number Name Type Description 1 INA I Clock input for eight A outputs. 2, 3, 4 QA0, QA1, QA2 O Clock A outputs. 5, 6 VDDA P Power supply for QA outputs. Connect to a voltage from 2.5V to 5V. Cannot exceed VDD. 7, 8 QA3, QA4 O Clock A outputs. 9, 10 GND P Connect to ground. 11, 12, 13 QA5, QA6, QA7 O Clock A outputs. 14 OE I Output Enable. Tri-states all clock outputs when this input is low. Internal pull-up to VDD. 15 VDD P Power supply for inputs. 16, 17, 18 QB7, QB6, QB5 O Clock B outputs. 19, 20 GND P Connect to ground. 21, 22 QB4, QB3 O Clock B outputs. 23, 24 VDDB P Power supply for QB outputs. Connect to a voltage from 2.5V to 5V. Cannot exceed VDD. 25, 26, 27 QB2, QB1, QB0 O Clock B outputs. 28 INB I Clock input for eight B outputs. Pin Descriptions Type: I = Input, O = output, P = power supply connection Pin Assignment QA0 QA1 QA2 QA3 QA4 QA5 QA7 QA6 INA GND GND OE VDDA VDDA QB0 QB1 QB2 QB3 QB4 QB5 QB7 QB6 INB GND GND VDD VDDB VDDB Suggested Layout A G G B For simplicity, series terminating resistors are not shown for the outputs, but should be placed as close to the device as possible. It is most critical to have the 0.01µF decoupling capacitors closest. V = connect to VDD = connect to low inductance ground plane G 0.01µF0.01µF A = connect to VDDA B = connect to VDDB G 0.01µF V

Dual 1 to 8 Buffalo™ Clock Driver IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com PRELIMINARY INFORMATION 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 Operating Voltage, VDDA or VDDB 2.375 VDD V Input High Voltage, VIH (INA, INB pins) VDD-1.0 VDD/2 V Input Low Voltage, VIL (INA, INB pins) VDD/2 1.0 V Input High Voltage, VIH (OE pin) 2.0 V Input Low Voltage, VIL (OE pin) 0.8 V Output High Voltage, 3.3V and 5V IOH=-12mA VDD-0.4 V Output High Voltage, 3.3V and 5V IOH=-25mA 2.4 V Output Low Voltage, 3.3V and 5V IOL=25mA 0.8 V Output High Voltage, 2.5V IOH=-16mA 2 V Output Low Voltage, 2.5V IOL=16mA 0.5 V Operating Supply Current, IDD, at 100 MHz No Load 55 mA Output Impedance 14 Ω Short Circuit Current Each output 100 mA On-Chip Pull-up Resistor OE 250 kΩ Input Capacitance 7 pF AC CHARACTERISTICS (VDD = 3.3 V unless noted)AC CHARACTERISTICS (VDD = 3.3 V unless noted) Input Clock Frequency Note 4 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 Clock A to B Skew At VDD/2. Note 3 100 250 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 A outputs, or any two B outputs, with equal loading. 3. Between any clock A output and any clock B output with INA connected to INB, and equal loading. 4. See discussion and graph of speed versus load.

Dual 1 to 8 Buffalo™ Clock Driver IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com PRELIMINARY INFORMATION 300 250 200 150 100 806040200 Maximum Speed The maximum speed at which the chip can operate is limited by power dissipation in 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 = VDDA = VDDB = 3.3 V, 70°C and with 33 Ω series termination resistors. 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 temperatures greater than 125°C. Also note that the load capacitance per pin must include PC board parasitics such as trace capacitance. If not all outputs of the chip are used, it is possible to operate the chip faster with larger loads. Consult ICS for your specific requirement. Do not operate in this area . Load Capacitance/per pin (pF) Graph 1 MK74CB218 Maximum Speed with all VDDs at 3.3V

Dual 1 to 8 Buffalo™ Clock Driver IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com PRELIMINARY INFORMATION

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 MK74CB218R MK74CB218R 28 pin SSOP 0-70 °C MK74CB218RTR MK74CB218R Add Tape & Reel 0-70 °C b D E1 E e A1 c A L INDEX AREA 1 2 Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.) 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 0.10 0.25 b 0.008 0.012 0.20 0.30 c 0.007 0.010 0.18 0.25 D 0.337 0.344 8.55 8.75 e .025 BSC .025 BSC 0.635 BSC 0.635 BSC E 0.228 0.244 5.80 6.20 E1 0.150 0.157 3.80 4.00 L 0.016 0.050 0.40 1.27