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PRELIMINARY INFORMATION
1 to 16 PECL to CMOS Buffalo™ Clock Driver
Description
The MK74CB163 Buffalo™ is a monolithic
CMOS high speed clock driver. It consists of a
PECL input to sixteen low-skew output, noninverting clock drivers. This monolithic solution
eliminates any concern for part-to-part skew
matching. The MK74CB163 is packaged in the
tiny 28 pin SSOP, which uses the same board
space as the narrow 16 pin SOIC.
MK74CB163
Features
• Tiny 28 pin SSOP (150 mil) package
• One input to sixteen output clock drivers
• Outputs are skew matched to within 250ps
• 3.3 V±10% supply voltage
• Clock speeds up to 156 MHz
• 2 Output Enables allow configuration as 1 to 6, 1
to 10, or 1 to 16 buffers.
• Converts PECL input to CMOS level outputs
Family of ICS Parts
The MK74CB163 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.
Block Diagram
PECLIN
PECLIN
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
OE0
VDD
4
Q15
Q14
Q13
Q12
Q11
Q10
Q9
Q8
4
GND
MDS 74CB163 A 1 Revision 112399
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408)295-9800tel • www.icst.com
OE1
PRELIMINARY INFORMATION
MK74CB163
1 to 16 PECL to CMOS Buffalo™ Clock Driver
Pin Assignment
1
OE0
2
Q0
Q1
3
Q2
4
5
VDD
VDD
6
Q3
7
Q4
8
Q5
Q6
Q7
9
10
11
12
13
14
GND
GND
PECLIN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
OE1
Q15
Q14
Q13
VDD
VDD
Q12
Q11
GND
GND
Q10
Q9
Q8
PECLIN
Suggested Layout
V
0.1µF
G G
For simplicity, 33 Ω 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 0.1µF
decoupling capacitors closest.
= connect to VDD
V
= connect to GNDG
V
0.1µF
Pin Descriptions
Number Name Type Description
1 OE0 I Output Enable. Tri-states Q0 to Q5 clock outputs when this input is low. Internal pull-up.
2, 3, 4 Q0, Q1, Q2 O Clock outputs.
5, 6 VDD P Power supply. Connect to +3.3V.
7, 8 Q3, Q4 O Clock outputs.
9, 10 GND P Connect to ground.
11, 12, 13 Q5, Q6, Q7 O Clock outputs.
14 PECLIN I Complementary PECL input.
15 PECLIN I True PECL input.
16, 17, 18 Q8, Q9, Q10 O Clock outputs.
19, 20 GND P Connect to ground.
21, 22 Q11, Q12 O Clock outputs.
23, 24 VDD P Power supply. Connect to +3.3V.
25, 26, 27 Q13, Q14, Q15 O Clock outputs.
28 OE1 I Output Enable. Tri-states Q6 to Q15 clock outputs when this input is low. Internal pull-up.
Type: I = Input, O = output, P = power supply connection
MDS 74CB163 A 2 Revision 112399
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408)295-9800tel • www.icst.com
PRELIMINARY INFORMATION
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
MK74CB163
1 to 16 PECL to CMOS Buffalo™ Clock Driver
Electrical Specifications
Parameter Conditions Minimum Typical Maximum Units
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
Operating Voltage, VDD 3.0 3.6 V
Input High Voltage, VIH (OE0, OE1 pins) 2.0 V
Input Low Voltage, VIL (OE0, OE1 pins) 0.8 V
Output High Voltage, VOH IOH=-12mA VDD-0.5 V
Output Low Voltage, VOL IOL=12mA 0.5 V
Operating Supply Current, IDD, at 66.6MHz No Load TBD mA
Short Circuit Current Each output ±70 mA
On-Chip Pull-up Resistor OE0, OE1 250 kΩ
Input Capacitance (OE0, OE1) 7 pF
Peak-to-Peak Input Voltage, VPP PECL inputs 300 1000 mV
Common Mode Range, VCMR PECL inputs VDD-1.4 VDD-0.6 V
Input Clock Frequency 0 156 MHz
Propagation Delay with load=15pF ns
Output Clock Rise Time 0.8 to 2.0V ns
Output Clock Fall Time 2.0 to 0.8V ns
Output Clock Rising Edge Skew Note 2 -250 0 250 ps
Output Enable Time, OE high to output on 5 20 ns
Output Disable Time, OE low to tri-state 5 20 ns
Output Duty Cycle, Load = 15 pF at VDD/2 0-125 MHz 45 50 55 %
Output Duty Cycle, Load = 15 pF at VDD/2 125-156 MHz 40 50 60 %
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, measured at VDD/2. The maximum skew between any 2 pins is 250 ps not 500 ps.
MDS 74CB163 A 3 Revision 112399
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408)295-9800tel • www.icst.com
PRELIMINARY INFORMATION
MK74CB163
1 to 16 PECL to CMOS Buffalo™ Clock Driver
Maximum Speed
The maximum speed at which the chip can operate can be 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 = 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. The MK74CB163 can safely
operate up to 156 MHz with all pins loaded at 15 pF.
300
250
200
150
100
Do not operate in this area .
50
0
806040200
Load Capacitance/per pin (pF)
Graph 1
Maximum Speed
MDS 74CB163 A 4 Revision 112399
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408)295-9800tel • www.icst.com
PRELIMINARY INFORMATION
Inches
Millimeters
1 to 16 PECL to CMOS Buffalo™ Clock Driver
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC publication no. 95)
28 pin SSOP (QSOP)
Symbol Min Max Min Max
E H
D
C
A1 0.004 0.01 0.10 0.25
A
MK74CB163
A 0.053 0.069 1.35 1.75
B 0.008 0.012 0.20 0.30
C 0.007 0.010 0.19 0.25
D 0.386 0.394 9.80 10.01
E 0.150 0.157 3.81 3.99
H 0.228 0.244 5.79 6.20
e
L 0.016 0.05 0.41 1.27
e
B
L
A1
Ordering Information
Part/Order Number Marking Package Temperature
MK74CB163R MK74CB163R 28 pin SSOP (QSOP) 0-70°C
MK74CB163RTR MK74CB163R Add Tape & Reel 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
MDS 74CB163 A 5 Revision 112399
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408)295-9800tel • www.icst.com
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