MK74CB115 [ICSI]
1 to 16 Buffalo⑩ Clock Driver; 1至16布法罗™时钟驱动器
| 型号： | MK74CB115 |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | 1 to 16 Buffalo⑩ Clock Driver |
| 文件： | 总5页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK74CB115
1 to 16 Buffalo™ Clock Driver
Description
Features
The MK74CB115 Buffalo™ is a monolithic
CMOS high speed clock driver. It consists of a
single input to sixteen low-skew output, non-
inverting clock drivers. The chip is capable of
driving 16 CMOS loads up to 200 MHz with a
maximum of 250 ps output to output skew. The
MK74CB115 is packaged in the tiny 28 pin SSOP,
which uses the same board space as the narrow 16
pin SOIC.
• Tiny 28 pin SSOP (150 mil) package
• One input to sixteen output clock drivers
• Outputs are skew matched to within 250 ps
• 3.3V±10% or 5V±10% supply voltage
• 3 Output Enables allow configuration as 1 to 4,
1 to 6, 1 to 10, 1 to 12 or 1 to 16 buffer
• Clock speeds up to 200 MHz
Family of ICS Parts
The MK74CB115 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
OE2
VDD
4
IN
Q0
Q15
Q14
Q13
Q12
Q11
Q10
Q9
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
4
OE0
OE1
GND
MDS 74CB115 D
1
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
MK74CB115
1 to 16 Buffalo™ Clock Driver
Pin Assignment
Suggested Layout
OE1 1
Q0 2
28 OE2
27 Q15
26 Q14
25 Q13
24 VDD
23 VDD
Q1
Q2
3
4
VDD 5
V
G
V
G
VDD
Q3
6
7
Q12
22
0.1µF
0.1µF
Q4 8
GND 9
GND 10
Q5 11
21 Q11
20 GND
19 GND
18
Q10
Q6 12
Q7 13
17 Q9
16 Q8
15 OE0
IN
14
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.
= connect to VDD
= connect to GND
G
V
Pin Descriptions
Number
1
Name
OE1
Type Description
I
O
O
P
P
O
I
Output Enable. Tri-states Q2 to Q7 clock outputs when this input is low. Internal pull-up.
2, 3
Q0, Q1
Q2, Q3, Q4
VDD
Clock outputs.
4, 7, 8
5, 6
Clock outputs.
Power supply. Connect to +3.3 V or 5 V.
9, 10
GND
Connect to ground.
11, 12, 13 Q5, Q6, Q7
Clock outputs.
14
15
IN
Clock input for 16 buffers.
OE0
I
Output Enable. Tri-states Q8 to Q13 clock outputs when this input is low. Internal pull-up.
16, 17, 18 Q8, Q9, Q10
19, 20 GND
21, 22, 25 Q11, Q12, Q13
O
P
O
P
O
I
Clock outputs.
Connect to ground.
Clock outputs.
23, 24
26, 27
28
VDD
Q14, Q15
OE2
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
MDS 74CB115 D
2
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
MK74CB115
1 to 16 Buffalo™ Clock Driver
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage, VDD
Inputs
Referenced to GND
7
VDD+0.5
VDD+0.5
70
V
V
Referenced to GND
Referenced to GND
0.5
0.5
0
Clock Outputs
V
Ambient Operating Temperature
Soldering Temperature
Storage Temperature
°C
°C
°C
Max of 20 seconds
260
-65
150
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
Operating Voltage, VDD
3.0
3.3
5.5
(VDD/2)-1
0.8
V
V
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
Input clock
Input clock
(VDD/2)+1
VDD/2
VDD/2
V
2.0
V
V
IOH=-8mA
IOH=-12mA
IOL=12mA
No Load
VDD-0.4
2.4
V
V
0.8
V
Operating Supply Current, IDD, at 100 MHz
Output Impedance
55
14
mA
W
mA
kW
pF
Short Circuit Current, 3.3V
On-Chip Pull-up Resistor
Each output
±50
250
5
OE0, OE1, OE2
Input Capacitance
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Input Clock Frequency with load = 8 pF
Propagation Delay with load = 15pF
Output Clock Rise Time
Note 4, 5
0
200
3
MH z
ns
1.4
0.8 to 2.0V
2
ns
Output Clock Fall Time
2.0 to 0.8V
2
ns
Output Clock Rising Edge Skew
Output Enable Time, OE high to output on
Output Disable Time, OE low to tri-state
At VDD/2. Note 2
100
250
20
20
ps
ns
ns
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 W per pin , 8 pF load per pin.
4. See discussion and graph of speed versus load, Graph 1 on following page.
MDS 74CB115 D
3
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
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 Wseries 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
Do not operate in this area .
200
150
100
50
0
0
20
40
60
80
Load Capacitance/per pin (pF), all 16 outputs loaded
Graph 1
MK74CB115
Maximum Speed at 3.3 V
MDS 74CB115 D
4
Revision 020800
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408) 295-9800tel • www.icst.com
MK74CB115
1 to 16 Buffalo™ Clock Driver
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC Publication No. 95.)
28 pin SSOP
Inches
Symbol Min
Millimeters
Max
0.053 0.069
Min
1.35
Max
A
A1
b
1.75
0.004 0.010 0.102
0.008 0.012 0.203
0.007 0.010 0.191
0.254
0.305
0.254
E1
E
c
D
e
0.386 0.394 9.804 10.008
.025 BSC 0.635 BSC
INDEX
AREA
E
0.228 0.244 5.791
0.150 0.157 3.810
0.016 0.050 0.406
6.198
3.988
1.270
1
2
E1
L
D
A
A1
c
b
L
e
Ordering Information
Part/Order Number
Marking
Package
Temperature
MK74CB115R
MK74CB115R
MK74CB115R
28 pin SSOP
0-70°C
0-70°C
MK74CB115RTR
Add Tape & Reel
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 74CB115 D
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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