inputs of the Buffalo are matched to the outputs of
ICS clock synthesizers. Consult ICS for
applications support.
Block Diagram
OE2
VDD
4
IN
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
4
Q15
Q14
Q13
Q12
Q11
Q10
Q9
Q8
OE1
GND
OE0
1
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
MDS 74CB115 D
MK74CB115
1 to 16 Buffalo™ Clock Driver
Pin Assignment
OE1
Q0
Q1
Q2
VDD
VDD
Q3
Q4
GND
GND
Q5
Q6
Q7
IN
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
OE2
Q15
Q14
Q13
VDD
VDD
Q12
Q11
GND
GND
Q10
Q9
Q8
OE0
Suggested Layout
V
0.1µF
G
V
0.1µF
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 0.1µF
decoupling capacitors closest.
V = connect to VDD
G = connect to GND
Pin Descriptions
Number
Name
1
OE1
2, 3
Q0, Q1
4, 7, 8
Q2, Q3, Q4
5, 6
VDD
9, 10
GND
11, 12, 13 Q5, Q6, Q7
14
IN
15
OE0
16, 17, 18 Q8, Q9, Q10
19, 20
GND
21, 22, 25 Q11, Q12, Q13
23, 24
VDD
26, 27
Q14, Q15
28
OE2
Type
I
O
O
P
P
O
I
I
O
P
O
P
O
I
Description
Output Enable. Tri-states Q2 to Q7 clock outputs when this input is low. Internal pull-up.
Clock outputs.
Clock outputs.
Power supply. Connect to +3.3 V or 5 V.
Connect to ground.
Clock outputs.
Clock input for 16 buffers.
Output Enable. Tri-states Q8 to Q13 clock outputs when this input is low. Internal pull-up.
Clock outputs.
Connect to ground.
Clock outputs.
Power supply. Connect to +3.3 V or 5 V.
Clock outputs.
Output Enable. Tri-states Q0, Q1, Q15 and Q14 clock outputs when this input is low.
Internal pull-up.
Type: I = Input, O = output, P = power supply connection
2
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
MDS 74CB115 D
MK74CB115
1 to 16 Buffalo™ 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 (IN pin)
Input Low Voltage, VIL (IN pin)
Input High Voltage, VIH (OE pins)
Input Low Voltage, VIL (OE pins)
Output High Voltage, 3.3V
Output High Voltage, 3.3V
Output Low Voltage, 3.3V
Operating Supply Current, IDD, at 100 MHz
Output Impedance
Short Circuit Current, 3.3V
On-Chip Pull-up Resistor
Input Capacitance
Input Clock Frequency with load = 8 pF
Propagation Delay with load = 15pF
Output Clock Rise Time
Output Clock Fall Time
Output Clock Rising Edge Skew
Output Enable Time, OE high to output on
Output Disable Time, OE low to tri-state
Conditions
Referenced to GND
Referenced to GND
Referenced to GND
Max of 20 seconds
-65
3.0
(VDD/2)+1
2.0
0.8
IOH=-8mA
IOH=-12mA
IOL=12mA
No Load
Each output
OE0, OE1, OE2
VDD-0.4
2.4
0.8
55
14
±50
250
5
0
1.4
0.8 to 2.0V
2.0 to 0.8V
At VDD/2. Note 2
200
3
2
2
250
20
20
3.3
VDD/2
VDD/2
Minimum
Typical
Maximum
7
VDD+0.5
VDD+0.5
70
260
150
5.5
(VDD/2)-1
Units
V
V
V
°C
°C
°C
V
V
V
V
V
V
V
V
mA
Ω
mA
kΩ
pF
MHz
ns
ns
ns
ps
ns
ns
ABSOLUTE MAXIMUM RATINGS (Note 1)
0.5
0.5
0
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
Input clock
Input clock
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Note 4, 5
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 outputs, with equal loading.
3. At VDD = 3.3 V, 70°C, series termination of 33
Ω
per pin , 8 pF load per pin.
4. See discussion and graph of speed versus load, Graph 1 on following page.
3
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
MDS 74CB115 D
MK74CB115
1 to 16 Buffalo™ 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 125°C. This is
at VDD = 3.3 V, 70°C and with 33
Ω
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 125°C. 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
MK74CB115
Maximum Speed at 3.3 V
4
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
MDS 74CB115 D
MK74CB115
1 to 16 Buffalo™ 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
INDEX
AREA
1
2
D
A1
e
Ordering Information
Part/Order Number
MK74CB115R
MK74CB115RTR
Marking
MK74CB115R
MK74CB115R
c
b
A
L
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 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
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Embedded System
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