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PRELIMINARY INFORMATION
MK74CB217 Dual 1 to 8 BuffaloTM Clock Driver
Features
* 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 * 3.3 V or 5 V supply voltage * Output Enable tri-states each bank of eight * Clock speeds up to 200 MHz
Description
The MK74CB217 BuffaloTM 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 MK74CB217 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 us for more details.
Family of ICS Parts
The MK74CB217 BuffaloTM 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.
Block Diagram
INA QA0 QA1 QA2 QA3 QA4 QA5 QA6 QA7
VDD
4 INB QB0 QB1 QB2 QB3 QB4 QB5 QB6 QB7 4 OEA (all A outputs)
GND
OEB (all B outputs)
1 Revision 12299 Printed 2/22/00 IntegratedCircuit Systems, Inc. * 525 Race Street * San Jose *CA *95126*(408) 295-9800tel * www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217 Dual 1 to 8 BuffaloTM Clock Driver
Pin Assignment
INA QA0 QA1 QA2 VDD VDD QA3 QA4 GND GND QA5 QA6 QA7 OEA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 INB 27 QB0 26 QB1 25 QB2 24 VDD 23 VDD 22 QB3 21 QB4 20 GND 19 GND 18 QB5 17 QB6 16 QB7 15 OEB
Suggested Layout
V 0.1F G
V 0.1F G
For simplicity, 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 0.1F decoupling capacitors closest. V = connect to VDD G = connect to GND
Pin Descriptions
Number 1 2, 3, 4 5, 6 7, 8 9, 10 11, 12, 13 14 15 16, 17, 18 19, 20 21, 22 23, 24 25, 26, 27 28 Name INA QA0, QA1, QA2 VDD QA3, QA4 GND QA5, QA6, QA7 OEA OEB QB7, QB6, QB5 GND QB4, QB3 VDD QB2, QB1, QB0 INB Type I O P O P O I I O P O P O I Description Clock input for eight A outputs. Clock A outputs. Power supply. Connect to 3.3 V or +5 V. Must be same as pins 23, 24. Clock A outputs. Connect to ground. Clock A outputs. Output Enable. Tri-states all A clock outputs when this input is low. Internal pull-up. Output Enable. Tri-states all B clock outputs when this input is low. Internal pull-up. Clock B outputs. Connect to ground. Clock B outputs. Power supply. Connect to +3.3 V or +5 V. Must be same as pins 5, 6. Clock B outputs. Clock input for eight B outputs.
Type: I = Input, O = output, P = power supply connection
2 Revision 12299 Printed 2/22/00 IntegratedCircuit Systems, Inc. * 525 Race Street * San Jose *CA *95126*(408) 295-9800tel * www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217 Dual 1 to 8 BuffaloTM Clock Driver
Minimum Typical Maximum 7 VDD+0.5 VDD+0.5 70 260 150 3.3 VDD/2 VDD/2 5.5 1.0 0.8 Units V V V C C C V V V V V V V V mA mA k pF MHz ns ns ns ps ps ns ns
Electrical Specifications
Parameter Supply Voltage, VDD Inputs Clock Outputs Ambient Operating Temperature Soldering Temperature Storage Temperature Operating Voltage, VDD Input High Voltage, VIH (INA, INB pins) Input Low Voltage, VIL (INA, INB pins) Input High Voltage, VIH (OEA, OEB pins) Input Low Voltage, VIL (OEA, OEB pins) Output High Voltage, 3.3V and 5V Output High Voltage, 3.3V and 5V Output Low Voltage, 3.3V and 5V Operating Supply Current, IDD, at 100 MHz
Output Impedance
Conditions Referenced to GND Referenced to GND Referenced to GND Max of 20 seconds
ABSOLUTE MAXIMUM RATINGS (Note 1)
0.5 0.5 0 -65 3.0 VDD-1.0 2.0 IOH=-12mA IOH=-25mA IOL=25mA No Load Each output OEA, OEB VDD-0.4 2.4 0.8 55 14 100 250 7 0 1.4 0.8 to 2.0V 2.0 to 0.8V At VDD/2. Note 2 At VDD/2. Note 3 200 3 2 2 250 250 20 20
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
Short Circuit Current On-Chip Pull-up Resistor Input Capacitance Input Clock Frequency Propagation Delay with load=15pF Output Clock Rise Time Output Clock Fall Time Output Clock Rising Edge Skew Output Clock A to B Skew Output Enable Time, OE high to output on Output Disable Time, OE low to tri-state
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Note 4
100 100
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.
3 Revision 12299 Printed 2/22/00 IntegratedCircuit Systems, Inc. * 525 Race Street * San Jose *CA *95126*(408) 295-9800tel * www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217 Dual 1 to 8 BuffaloTM Clock Driver
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 125C. This is at VDD = 3.3 V, 70C and with 33 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 125C. 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.
300 250 200 150 100 50 0 0 20 40 60 80
Do not operate in this area.
Load Capacitance/per pin (pF) Graph 1 MK74CB217 Maximum Speed
4 Revision 12299 Printed 2/22/00 IntegratedCircuit Systems, Inc. * 525 Race Street * San Jose *CA *95126*(408) 295-9800tel * www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217 Dual 1 to 8 BuffaloTM Clock Driver
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC publication no. 95.) 28 pin SSOP
Symbol A A1 b c D E1 E e L Inches Min Max 0.053 0.069 0.004 0.01 0.008 0.012 0.007 0.010 0.386 0.394 0.150 0.157 0.228 0.244 .025 BSC 0.016 0.05 Millimeters Min Max 1.35 1.75 0.10 0.25 0.20 0.30 0.19 0.25 9.80 10.01 3.81 3.99 5.79 6.20 0.635 BSC 0.41 1.27
E1
E
D A1 e b c L A
Ordering Information
Part/Order Number MK74CB217R MK74CB217RTR Marking MK74CB217R MK74CB217R Package 28 pin SSOP Add Tape & Reel Temperature 0-70 C 0-70 C
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
5 Revision 12299 Printed 2/22/00 IntegratedCircuit Systems, Inc. * 525 Race Street * San Jose *CA *95126*(408) 295-9800tel * www.icst.com
MDS74CB217A

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