MK74CB218 IDT | Alldatasheet

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Technical content

Features

• Packaged as 28-pin SSOP (150 mil body) • Pb (lead) free package, RoHS compliant • 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 or 3.3 V output voltages • Output Enable tri-states each bank of eight • Clock speeds up to 200 MHz Family of IDT Parts The MK74CB218 Buffalo™ is designed to be used with IDT’s clock synthesizer devices. The inputs of the Buffalo are matched to the outputs of IDT clock synthesizers. Consult IDT for applications support. Not recommended for new designs. See the MK74CB218B for new designs. Block Diagram VDD GNDOE (all outputs) QB5 QB7 QB4 QB6 QB1 QB3 QB0 QB2 VDDA VDDB INB QA5 QA7 QA4 QA6 QA1 QA3 QA0 QA2 INA

DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER IDT™ / ICS™ DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 2 MK74CB218 REV K 051310 Pin Assignment Suggested Layout Pin Descriptions QA3 QA4 GND QB4 GND QA5 GND GND QB5 QA6 QB6 VDD QA7 QB7 OE QB3 VDDA VDDA VDDB VDDB QA1 QA2 QB2 QB1 INA QA0 QB0 INB A G B G V G 0.01 µF 0.01 µF 0.01 µF NOTE: 33 ohm series termination resistors for each output are essential for operation. For simplicity, series termination 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 0.01 µF decoupling capacitors closest. A V B G = connect to VDDA = connect to VDD = connect to VDDB = connect to low inductance ground plane Pin Number Pin Name Pin Type Pin Description 1 INA Input Clock input for eight A outputs. 2, 3, 4 QA0, QA1, QA2 Output Clock A outputs. 5, 6 VDDA Power Power supply for QA outputs. Connect to a voltage from 2.5 V to VDD. Cannot exceed VDD. 7, 8 QA3, QA4 Output Clock A outputs. 9, 10 GND Power Connect to ground. 11, 12, 13 QA5, QA6, QA7 Output Clock A outputs. 14 OE Input Output Enable. Tri-states all clock output s when this input is low. Internal pull-up to VDD. 15 VDD Power Power supply for inputs. 16, 17, 18 QB7, QB6, QB5 Output Clock B outputs. 19, 20 GND Power Connect to ground. 21, 22 QB4, QB3 Output Clock B outputs. 23, 24 VDDB Power Power supply for QB outputs. Connect to a voltage from 2.5 V to VDD. Cannot exceed VDD. 25, 26, 27 QB2, QB1, QB0 Output Clock B outputs. 28 INB Input Clock input for eight B outputs.

DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER IDT™ / ICS™ DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 3 MK74CB218 REV K 051310 Maximum Speed The maximum speed at which the chip can operate is limited by the 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 33Ω series termination resistors.The termination resistors are essential because they allow a large proportion of the total power 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 IDT for your specific requirement.

DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER IDT™ / ICS™ DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 4 MK74CB218 REV K 051310 Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK74CB218. These ratings, which are standard values for IDT 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. Unless stated otherwise, VDD = 3.3 V ±10% Note: Short circuits may be applied indefintely, but only one output may be shorted at a time to prevent exceeding the power dissipation rating of this package. Item Rating Supply Voltage, VDD (referenced to GND) 5.2 V All Inputs and Outputs (referenced to GND) -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +70 ° C Storage Temperature -65° C to 150° C Soldering Temperature 260° C (max. of 20 seconds) Parameter Symbol Conditions Min. Typ. Max. Units Operating Voltage VDD 3.0 3.3 3.6 V Operating Voltage VDDA or VDDB 2.375 VDD V Operating Supply Current IDD At 100 MHz, No load 75 mA Input High Voltage V IH INA, INB pins 0.65VDD V Input Low Voltage V IL INA, INB pins 0.35VDD V Input High Voltage V IH OE pin 2.0 V Input Low Voltage V IL OE pin 0.8 V Output High Voltage V OH IOH = -12 mA VDD-0.4 V Output High Voltage V OH IOH = -25 mA 2.4 V Output Low Voltage V OL IOL = 25 mA 0.8 V Output High Voltage V OH VDD = 2.5 V, IOH = -16 mA Output Low Voltage V OL VDD = 2.5 V, IOL = 16 mA 0.5 V Output Impedance 14 Ω Short Circuit Current Each output, VOUT=GND or VDD 100 mA Input Capacitance C IN 7p F On-chip Pull-up Resistor R PU OE 250 k Ω

DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER IDT™ / ICS™ DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 5 MK74CB218 REV K 051310 Unless stated otherwise, VDD = 3.3 V ±10% Notes: 1. Between any two A outputs, or any two B outputs, with equal loading. 2. Between any clock A output and any clock B output with INA connected to INB, and equal loading. 3. See discussion and graph of speed versus load. Thermal Characteristics Parameter Symbol Conditions Min. Typ. Max. Units Input Clock Frequency F IN Note 3 0 200 MHz Propagation Delay, 3.3 V With load = 15 pF 3 6 ns Output Clock Rise Time 20% to 80%, C L=10 pF 1 2 ns Output Clock Rise Time VDD = 2.5 V, 20% to 80%, CL=10 pF 23n s Output Clock Fall Time 80% to 20%, C L=10 pF 1 2 ns Output Clock Fall Time VDD = 2.5 V, 80% to 20%, CL=10 pF 23n s Output Duty Cycle VDD = 3.3 V or 2.5 V, CL=10 pF 40 50 60 % Output Clock Rising Edge Skew At VDD/2, Note 1 100 250 ps Output Clock A to B 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 Parameter Symbol Conditions Min. Typ. Max. Units Thermal Resistance Junction to Ambient θ JA Still air 100 ° C/W θ JA 1 m/s air flow 80 ° C/W θ JA 3 m/s air flow 67 ° C/W Thermal Resistance Junction to Case θ JC 60 ° C/W

DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER IDT™ / ICS™ DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 6 MK74CB218 REV K 051310 Package Outline and Package Dimensions (28-pin SSOP, 150 mil Body) Package dimensions are kept current with JEDEC Publication No. 95, MO-153

Ordering Information

Parts that are ordered with a “LF” suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. Part / Order Number Marking Shipping Packaging Package Temperature MK74CB218RLF MK74CB218RLF Tubes 28-pin SSOP 0 to +70 ° C MK74CB218RLFTR MK74CB218RLF Tape and Reel 28-pin SSOP 0 to +70 ° C INDEX AREA 1 2 D E1 E SEATING PLANE A AA e - C - b aaa C c L Millimeters Inches Symbol Min Max Min Max A 1 .351 .75. 053. 069 A1 0.10 0.25 .0040 .010 A2 -- 1.50 -- .059 b 0 .200 .30. 008. 012 C 0 .180 .25. 007. 010 D 9.80 10.00 .386 .394 E 5 .806 .20. 228. 244 E1 3.80 4.00 .150 .157 e 0.635 Basic 0.025 Basic L 0 .401 .27. 016. 050 α 0° 8° 0° 8°

© 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice . IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Techno logy, Inc. All other brands, product names a nd marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA Corporate Headquarters Integrated Device Technology, Inc. www.idt.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 For Tech Support www.idt.com/go/clockhelp Innovate with IDT and accelerate your future networks. Contact: www.IDT.com MK74CB218 DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER