• 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
OE0
PECLIN
PECLIN
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
4
VDD
4
Q15
Q14
Q13
Q12
Q11
Q10
Q9
Q8
GND
MDS 74CB163 A
OE1
1
Revision 112399
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408)295-9800tel • www.icst.com
MK74CB163
1 to 16 PECL to CMOS Buffalo™ Clock Driver
Pin Assignment
OE0
Q0
Q1
Q2
VDD
VDD
Q3
Q4
GND
GND
Q5
Q6
Q7
PECLIN
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
OE1
Q15
Q14
Q13
VDD
VDD
Q12
Q11
GND
GND
Q10
Q9
Q8
PECLIN
PRELIMINARY INFORMATION
Suggested Layout
V
0.1µF
G
V
0.1µF
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.
V = connect to VDD
G = connect to GND
Pin Descriptions
Number
Name
1
OE0
2, 3, 4
Q0, Q1, Q2
5, 6
VDD
7, 8
Q3, Q4
9, 10
GND
11, 12, 13 Q5, Q6, Q7
14
PECLIN
15
PECLIN
16, 17, 18 Q8, Q9, Q10
19, 20
GND
21, 22
Q11, Q12
23, 24
VDD
25, 26, 27 Q13, Q14, Q15
28
OE1
Type
I
O
P
O
P
O
I
I
O
P
O
P
O
I
Description
Output Enable. Tri-states Q0 to Q5 clock outputs when this input is low. Internal pull-up.
Clock outputs.
Power supply. Connect to +3.3V.
Clock outputs.
Connect to ground.
Clock outputs.
Complementary PECL input.
True PECL input.
Clock outputs.
Connect to ground.
Clock outputs.
Power supply. Connect to +3.3V.
Clock outputs.
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
MK74CB163
1 to 16 PECL to CMOS Buffalo™ Clock Driver
Electrical Specifications
Parameter
Conditions
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage, VDD
Referenced to GND
Inputs
Referenced to GND
Clock Outputs
Referenced to GND
Ambient Operating Temperature
Soldering Temperature
Max of 20 seconds
Storage Temperature
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
Operating Voltage, VDD
Input High Voltage, VIH (OE0, OE1 pins)
Input Low Voltage, VIL (OE0, OE1 pins)
Output High Voltage, VOH
IOH=-12mA
Output Low Voltage, VOL
IOL=12mA
Operating Supply Current, IDD, at 66.6MHz
No Load
Short Circuit Current
Each output
On-Chip Pull-up Resistor
OE0, OE1
Input Capacitance (OE0, OE1)
Peak-to-Peak Input Voltage, VPP
PECL inputs
Common Mode Range, VCMR
PECL inputs
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Input Clock Frequency
Propagation Delay with load=15pF
Output Clock Rise Time
0.8 to 2.0V
Output Clock Fall Time
2.0 to 0.8V
Output Clock Rising Edge Skew
Note 2
Output Enable Time, OE high to output on
Output Disable Time, OE low to tri-state
Output Duty Cycle, Load = 15 pF at VDD/2
0-125 MHz
Output Duty Cycle, Load = 15 pF at VDD/2
125-156 MHz
Minimum
Typical
Maximum
7
VDD+0.5
VDD+0.5
70
260
150
3.6
0.8
VDD-0.5
0.5
TBD
±70
250
7
300
VDD-1.4
0
1000
VDD-0.6
156
Units
V
V
V
°C
°C
°C
V
V
V
V
V
mA
mA
kΩ
pF
mV
V
MHz
ns
ns
ns
ps
ns
ns
%
%
PRELIMINARY INFORMATION
0.5
0.5
0
-65
3.0
2.0
-250
45
40
0
5
5
50
50
250
20
20
55
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
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.
PRELIMINARY INFORMATION
300
250
Do not operate in this area
.
200
150
100
50
0
0
20
40
60
80
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
MK74CB163
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
A
A1
B
C
D
E
H
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
PRELIMINARY INFORMATION
E
H
D
C
A
e
A1
B
L
Ordering Information
Part/Order Number
MK74CB163R
MK74CB163RTR
Marking
MK74CB163R
MK74CB163R
Package
28 pin SSOP (QSOP)
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
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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