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PRELIMINARY INFORMATION
MK74CB44 Quad 1 to 4 BuffaloTM Clock Driver
Features
* Tiny 28 pin SSOP (150 mil) package * Quad one input to four output clock drivers * Outputs are skew matched to within 250ps * A, B, C and D banks matched to 250ps * 3.3V10% and/or 5V10% supply voltage * Clock speeds up to 200 MHz * For tighter skew matching, more outputs, or other speeds, consult ICS for other solutions
Description
The MK74CB44 BuffaloTM is a monolithic CMOS high speed clock driver. It consists of four identical single input to four low-skew output, non-inverting clock drivers. When combined with ICS's MK series of low jitter clock synthesizers, the chips form an unequaled high performance clocking scheme. This monolithic solution can eliminate concern for part-to-part skew matching. The MK74CB44 is packaged in the tiny 28 pin SSOP, which uses the same board space as the narrow 16 pin SOIC.
Family of ICS Parts
The MK74CB44 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
VDD 4
INA QA0 QA1 QA2 QA3 QB0 QB1 QB2 QB3 INB
4 GND
IND QD0 QD1 QD2 QD3 QC0 QC1 QC2 QC3 INC
1 Revision 022000 Printed 11/17/00 Integrated Circuit Systems, Inc. * 525 Race St. * San Jose * CA * 95126 * (408)295-9800tel * www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44 Quad 1 to 4 BuffaloTM Clock Driver
Pin Assignment
INA QA0 QA1 QA2 VDD VDD QA3 QB0 GND GND QB1 QB2 QB3 INB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 IND QD0 QD1 QD2 VDD VDD QD3 QC0 GND GND QC1 QC2 QC3 INC
Suggested Layout
V 0.01F G
V 0.01F G
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 0.01F 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 Type INA I QA0, QA1, QA2 O VDD P QA3 O QB0 o GND P QB1, QB2, QB3 O INB I INC I QC3, QC2, QC1 O GND P QC0 O QD3 O VDD P QD2, QD1, QD0 O IND I Description Clock input for four A outputs. Clock A outputs. Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 23, 24. Clock A output. Clock B output. Connect to ground. Clock B outputs. Clock input for four B outputs. Clock input for four C outputs. Clock C outputs. Connect to ground. Clock C output. Clock D output. Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 5, 6. Clock D outputs. Clock input for four D outputs.
Type: I = Input, O = output, P = power supply connection
2 Revision 022000 Printed 11/17/00 Integrated Circuit Systems, Inc. * 525 Race St. * San Jose * CA * 95126 * (408)295-9800tel * www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44 Quad 1 to 4 BuffaloTM Clock Driver
Electrical Specifications
Parameter Supply Voltage, VDD Inputs Clock Outputs Ambient Operating Temperature Soldering Temperature Storage Temperature Operating Voltage, VDD Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage Output High Voltage Output Low Voltage Operating Supply Current, IDD, at 100 MHz Output Impedance Short Circuit Current 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 Bank to Bank Skew Conditions Referenced to GND Referenced to GND Referenced to GND Max of 20 seconds -65 3.0 VDD-1 IOH=-8mA IOH=-12mA IOL=12mA No Load Each output VDD-0.4 2.4 0.8 55 14 50 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 3.3 VDD/2 VDD/2 Minimum Typical Maximum 7 VDD+0.5 VDD+0.5 70 260 150 5.5 1 Units V V V C C C V V V V V V mA mA pF MHz ns ns ns ps ps
ABSOLUTE MAXIMUM RATINGS (Note 1)
0.5 0.5 0
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Note 4, 5
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. Within any bank of four outputs, with equal loading. 3. Between any two banks of four with their inputs connected together, and equal loading. 4. At VDD = 3.3 V, 70C, series termination of 33 per pin, 8 pF load per pin. 5. See discussion and graph of speed versus load.
3 Revision 022000 Printed 11/17/00 Integrated Circuit Systems, Inc. * 525 Race St. * San Jose * CA * 95126 * (408)295-9800tel * www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44 Quad 1 to 4 BuffaloTM Clock Driver
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 125C. This is at VDD = 3.3 V, 70C and with 33 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 125C. 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 50 0 0 20 40 60 80
Do not operate in this area .
Load Capacitance/per pin (pF), all 16 outputs loaded Graph 1 MK74CB44 Maximum Speed at 3.3 V
4 Revision 022000 Printed 11/17/00 Integrated Circuit Systems, Inc. * 525 Race St. * San Jose * CA * 95126 * (408)295-9800tel * www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44 Quad 1 to 4 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 e E E1 L Inches Min Max 0.053 0.069 0.004 0.010 0.008 0.012 0.007 0.010 0.386 0.394 .025 BSC 0.228 0.244 0.150 0.157 0.016 0.050 Millimeters Min Max 1.35 1.75 0.102 0.254 0.203 0.305 0.191 0.254 9.804 10.008 0.635 BSC 5.791 6.198 3.810 3.988 0.406 1.270
E1
E
D A1 e b c A L
Ordering Information
Part/Order Number MK74CB44R MK74CB44RTR Marking MK74CB44R MK74CB44R Package 28 pin SSOP Add Tape & Reel Temperature 0-70C 0-70C
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 022000 Printed 11/17/00 Integrated Circuit Systems, Inc. * 525 Race St. * San Jose * CA * 95126 * (408)295-9800tel * www.icst.com
MDS 74CB44 B

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