be connected together for a 1 to 16 fanout buffer.
A quad 1 to 4, and PECL versions, are also
available. Consult us for more details.
Family of ICS Parts
The MK74CB217 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
INA
QA0
QA1
QA2
QA3
QA4
QA5
QA6
QA7
VDD
4
INB
QB0
QB1
QB2
QB3
QB4
QB5
QB6
QB7
4
OEA (all A outputs)
GND
OEB (all B outputs)
1
Revision 12299
Printed 2/22/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217
Dual 1 to 8 Buffalo™ Clock Driver
Pin Assignment
INA
QA0
QA1
QA2
VDD
VDD
QA3
QA4
GND
GND
QA5
QA6
QA7
OEA
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
INB
QB0
QB1
QB2
VDD
VDD
QB3
QB4
GND
GND
QB5
QB6
QB7
OEB
Suggested Layout
V
0.1µF
G
V
0.1µF
G
For simplicity, terminating 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
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
INA
QA0, QA1, QA2
VDD
QA3, QA4
GND
QA5, QA6, QA7
OEA
OEB
QB7, QB6, QB5
GND
QB4, QB3
VDD
QB2, QB1, QB0
INB
Type
I
O
P
O
P
O
I
I
O
P
O
P
O
I
Description
Clock input for eight A outputs.
Clock A outputs.
Power supply. Connect to 3.3 V or +5 V. Must be same as pins 23, 24.
Clock A outputs.
Connect to ground.
Clock A outputs.
Output Enable. Tri-states all A clock outputs when this input is low. Internal pull-up.
Output Enable. Tri-states all B clock outputs when this input is low. Internal pull-up.
Clock B outputs.
Connect to ground.
Clock B outputs.
Power supply. Connect to +3.3 V or +5 V. Must be same as pins 5, 6.
Clock B outputs.
Clock input for eight B outputs.
Type: I = Input, O = output, P = power supply connection
2
Revision 12299
Printed 2/22/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217
Dual 1 to 8 Buffalo™ Clock Driver
Minimum
Typical
Maximum
7
VDD+0.5
VDD+0.5
70
260
150
3.3
VDD/2
VDD/2
5.5
1.0
0.8
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
ps
ns
ns
Electrical Specifications
Parameter
Supply Voltage, VDD
Inputs
Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage Temperature
Operating Voltage, VDD
Input High Voltage, VIH (INA, INB pins)
Input Low Voltage, VIL (INA, INB pins)
Input High Voltage, VIH (OEA, OEB pins)
Input Low Voltage, VIL (OEA, OEB pins)
Output High Voltage, 3.3V and 5V
Output High Voltage, 3.3V and 5V
Output Low Voltage, 3.3V and 5V
Operating Supply Current, IDD, at 100 MHz
Output Impedance
Conditions
Referenced to GND
Referenced to GND
Referenced to GND
Max of 20 seconds
ABSOLUTE MAXIMUM RATINGS (Note 1)
0.5
0.5
0
-65
3.0
VDD-1.0
2.0
IOH=-12mA
IOH=-25mA
IOL=25mA
No Load
Each output
OEA, OEB
VDD-0.4
2.4
0.8
55
14
100
250
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
20
20
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
Short Circuit Current
On-Chip Pull-up Resistor
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 A to B Skew
Output Enable Time, OE high to output on
Output Disable Time, OE low to tri-state
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Note 4
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. Between any two A outputs, or any two B outputs, with equal loading.
3. Between any clock A output and any clock B output with INA connected to INB, and equal loading.
4. See discussion and graph of speed versus load.
3
Revision 12299
Printed 2/22/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217
Dual 1 to 8 Buffalo™ Clock Driver
Maximum Speed
The maximum speed at which the chip can operate is 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.
If not all outputs of the chip are used, it is possible to operate the chip faster with larger loads. 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)
Graph 1
MK74CB217
Maximum Speed
4
Revision 12299
Printed 2/22/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
MDS74CB217A
PRELIMINARY INFORMATION
MK74CB217
Dual 1 to 8 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
E1
E
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
E1
E
D
A1
e
b
c
L
A
Ordering Information
Part/Order Number
MK74CB217R
MK74CB217RTR
Marking
MK74CB217R
MK74CB217R
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 12299
Printed 2/22/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
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