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MK74CB218
Dual 1 to 8 BuffaloTM Clock Driver
Description
The MK74CB218 BuffaloTM is a monolithic CMOS high speed clock driver. It consists of two identical single input to eight low-skew output, non-inverting clock drivers. This eliminates concerns of part to part matching in many systems. The MK74CB218 is packaged in the tiny 28-pin SSOP, which uses the same board space as the narrow 16-pin SOIC. The inputs can be connected together for a 1 to 16 fanout buffer. A quad 1 to 4, and PECL versions, are also available. Consult ICS for more details. The MK74CB218 can also act as a voltage translator, since it is possible to run the inputs at 3.3 V and the outputs at 2.5 V.
Features
* * * * * * * *
Packaged as 28-pin SSOP (150 mil body) Available in Pb (lead) free package Dual one input to eight output clock drivers Outputs are skew matched to within 250 ps A outputs and B outputs matched to 250 ps 2.5 V or 3.3 V output voltages Output Enable tri-states each bank of eight Clock speeds up to 200 MHz
Family of ICS Parts
The MK74CB218 BuffaloTM 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
VDDA VDD VDDB
INA QA0 QA1 QA2 QA3 QA4 QA5 QA6 QA7
INB QB0 QB1 QB2 QB3 QB4 QB5 QB6 QB7
OE (all outputs)
GND
MDS 74CB218 H Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 032205 tel (408) 297-1201
www.icst.com
MK74CB218 Dual 1 to 8 BuffaloTM Clock Driver
Pin Assignment
INA QA0 QA1 QA2 VDDA VDDA QA3 QA4 GND GND QA5 QA6 QA7 OE 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 VDDB VDDB QB3 QB4 GND GND QB5 QB6 QB7 VDD
Suggested Layout
A
0.01 F
B
0.01 F
G
G
0.01 F
G V
NOTE: 33 ohm series termination resistors for each output are essential for operation. For simplicity, 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 0.01 F decoupling capacitors closest.
A V
= connect to VDDA = connect to VDD
B G
= connect to VDDB = connect to low inductance ground plane
Pin Descriptions
Pin Number
1 2, 3, 4 5, 6 7, 8 9, 10
Pin Name
INA QA0, QA1, QA2 VDDA QA3, QA4 GND
Pin Type
Input Output Power Output Power Output Input Power Output Power Output Power Output Input Clock input for eight A outputs. Clock A outputs.
Pin Description
Power supply for QA outputs. Connect to a voltage from 2.5 V to VDD. Cannot exceed VDD. Clock A outputs. Connect to ground. Clock A outputs. Output Enable. Tri-states all clock outputs when this input is low. Internal pull-up to VDD. Power supply for inputs. Clock B outputs. Connect to ground. Clock B outputs. Power supply for QB outputs. Connect to a voltage from 2.5 V to VDD. Cannot exceed VDD. Clock B outputs. Clock input for eight B outputs.
11, 12, 13 QA5, QA6, QA7 14 15 OE VDD
16, 17, 18 QB7, QB6, QB5 19, 20 21, 22 23, 24 GND QB4, QB3 VDDB
25, 26, 27 QB2, QB1, QB0 28 INB
MDS 74CB218 H Integrated Circuit Systems, Inc.
2
525 Race Street, San Jose, CA 95126
Revision 032205 tel (408) 297-1201
www.icst.com
MK74CB218 Dual 1 to 8 BuffaloTM Clock Driver
Maximum Speed
The maximum speed at which the chip can operate is limited by the power dissipation in the package. Graph 1 shows the operating frequency plotted against load capacitance per pin for a die temperature of 125C. This is at VDD = VDDA = VDDB = 3.3 V, 70C and with 33 series termination resistors.The termination resistors are essential because they allow a large proportion of the total power 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 125C. 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.
MDS 74CB218 H Integrated Circuit Systems, Inc.
3
525 Race Street, San Jose, CA 95126
Revision 032205 tel (408) 297-1201
www.icst.com
MK74CB218 Dual 1 to 8 BuffaloTM Clock Driver
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK74CB218. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.
Item
Supply Voltage, VDD (referenced to GND) All Inputs and Outputs (referenced to GND) Ambient Operating Temperature Storage Temperature Soldering Temperature 5.2 V
Rating
-0.5 V to VDD+0.5 V 0 to +70C -65C to 150C 260C (max. of 20 seconds)
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 10%
Parameter
Operating Voltage Operating Voltage Operating Supply Current Input High Voltage Input Low Voltage Input High Voltage Input Low Voltage Output High Voltage Output High Voltage Output Low Voltage Output High Voltage Output Low Voltage Output Impedance Short Circuit Current Input Capacitance On-chip Pull-up Resistor
Symbol
VDD VDDA or VDDB IDD VIH VIL VIH VIL VOH VOH VOL VOH VOL
Conditions
Min.
3.0 2.375
Typ.
3.3
Max.
3.6 VDD
Units
V V mA V
At 100 MHz, No load INA, INB pins INA, INB pins OE pin OE pin IOH = -12 mA IOH = -25 mA IOL = 25 mA VDD = 2.5 V, IOH = -16 mA VDD = 2.5 V, IOL = 16 mA 2 VDD-0.4 2.4 2.0 0.65VDD
75
0.35VDD
V V
0.8
V V V
0.8
V V
0.5 14
V mA pF k
Each output, VOUT=GND or VDD CIN RPU OE
100 7 250
Note: Short circuits may be applied indefintely, but only one output may be shorted at a time to prevent exceeding the power dissipation rating of this package.
MDS 74CB218 H Integrated Circuit Systems, Inc.
4
525 Race Street, San Jose, CA 95126
Revision 032205 tel (408) 297-1201
www.icst.com
MK74CB218 Dual 1 to 8 BuffaloTM Clock Driver
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 10%
Parameter
Input Clock Frequency Propagation Delay, 3.3 V Output Clock Rise Time Output Clock Rise Time Output Clock Fall Time Output Clock Fall Time Output Duty Cycle Output Clock Rising Edge Skew Output Clock A to B Skew Output Enable Time Output Disable Time
Symbol
FIN
Conditions
Note 3 With load = 15 pF 20% to 80%, CL=10 pF VDD = 2.5 V, 20% to 80%, CL=10 pF 80% to 20%, CL=10 pF VDD = 2.5 V, 80% to 20%, CL=10 pF VDD = 3.3 V or 2.5 V, CL=10 pF At VDD/2, Note 1 At VDD/2, Note 2 OE high to output on OE low to tri-state
Min.
0
Typ.
3 1 2 1 2
Max.
200 6 2 3 2 3 60 250 250 20 20
Units
MHz ns ns ns ns ns % ps ps ns ns
40
50 100 100
Notes: 1. Between any two A outputs, or any two B outputs, with equal loading. 2. Between any clock A output and any clock B output with INA connected to INB, and equal loading. 3. See discussion and graph of speed versus load.
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
100 80 67 60
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
MDS 74CB218 H Integrated Circuit Systems, Inc.
5
525 Race Street, San Jose, CA 95126
Revision 032205 tel (408) 297-1201
www.icst.com
MK74CB218 Dual 1 to 8 BuffaloTM Clock Driver
Package Outline and Package Dimensions (28-pin SSOP, 150 mil Body)
Package dimensions are kept current with JEDEC Publication No. 95, MO-153
28
Millimeters Symbol
E1 INDEX AREA E
Inches Min Max
Min
Max
12 D
A 2 A 1
A
A A1 A2 b C D E E1 e L aaa
1.35 1.75 0.10 0.25 -1.50 0.20 0.30 0.18 0.25 9.80 10.00 5.80 6.20 3.80 4.00 0.635 Basic 0.40 1.27 0 8 -0.10
.053 .069 .0040 .010 -.059 .008 .012 .007 .010 .386 .394 .228 .244 .150 .157 0.025 Basic .016 .050 0 8 -0.004
c
-Ce
b SEATING PLANE L
aaa C
Ordering Information
Part / Order Number
MK74CB218R MK74CB218RTR MK74CB218RLF MK74CB218RLFTR
Marking
MK74CB218R MK74CB218R MK74CB218RLF MK74CB218RLF
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel
Package
28-pin SSOP 28-pin SSOP 28-pin SSOP 28-pin SSOP
Temperature
0 to +70C 0 to +70C 0 to +70C 0 to +70C
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) 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.
MDS 74CB218 H Integrated Circuit Systems, Inc.
6
525 Race Street, San Jose, CA 95126
Revision 032205 tel (408) 297-1201
www.icst.com

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