Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44
Quad 1 to 4 Buffalo™ Clock Driver
Pin Assignment
INA
QA0
QA1
QA2
VDD
VDD
QA3
QB0
GND
GND
QB1
QB2
QB3
INB
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
IND
QD0
QD1
QD2
VDD
VDD
QD3
QC0
GND
GND
QC1
QC2
QC3
INC
Suggested Layout
V
0.01µF
G
V
0.01µF
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 0.01µF
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
Type
INA
I
QA0, QA1, QA2
O
VDD
P
QA3
O
QB0
o
GND
P
QB1, QB2, QB3
O
INB
I
INC
I
QC3, QC2, QC1
O
GND
P
QC0
O
QD3
O
VDD
P
QD2, QD1, QD0
O
IND
I
Description
Clock input for four A outputs.
Clock A outputs.
Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 23, 24.
Clock A output.
Clock B output.
Connect to ground.
Clock B outputs.
Clock input for four B outputs.
Clock input for four C outputs.
Clock C outputs.
Connect to ground.
Clock C output.
Clock D output.
Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 5, 6.
Clock D outputs.
Clock input for four D outputs.
Type: I = Input, O = output, P = power supply connection
2
Revision 022000
Printed 11/17/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44
Quad 1 to 4 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
Input Low Voltage, VIL
Output High Voltage
Output High Voltage
Output Low Voltage
Operating Supply Current, IDD, at 100 MHz
Output Impedance
Short Circuit Current
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 Bank to Bank Skew
Conditions
Referenced to GND
Referenced to GND
Referenced to GND
Max of 20 seconds
-65
3.0
VDD-1
IOH=-8mA
IOH=-12mA
IOL=12mA
No Load
Each output
VDD-0.4
2.4
0.8
55
14
50
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
3.3
VDD/2
VDD/2
Minimum
Typical
Maximum
7
VDD+0.5
VDD+0.5
70
260
150
5.5
1
Units
V
V
V
°C
°C
°C
V
V
V
V
V
V
mA
Ω
mA
pF
MHz
ns
ns
ns
ps
ps
ABSOLUTE MAXIMUM RATINGS (Note 1)
0.5
0.5
0
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Note 4, 5
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. Within any bank of four outputs, with equal loading.
3. Between any two banks of four with their inputs connected together, and equal loading.
4. At VDD = 3.3 V, 70°C, series termination of 33
Ω
per pin, 8 pF load per pin.
5. See discussion and graph of speed versus load.
3
Revision 022000
Printed 11/17/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44
Quad 1 to 4 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
MK74CB44
Maximum Speed at 3.3 V
4
Revision 022000
Printed 11/17/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
MDS 74CB44 B
PRELIMINARY INFORMATION
MK74CB44
Quad 1 to 4 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
D
A1
e
b
c
A
L
Ordering Information
Part/Order Number
MK74CB44R
MK74CB44RTR
Marking
MK74CB44R
MK74CB44R
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 022000
Printed 11/17/00
Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
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