MK74CB218R [ICSI]
Dual 1 to 8 Buffalo⑩ Clock Driver; 双1至8布法罗™时钟驱动器
| 型号： | MK74CB218R |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Dual 1 to 8 Buffalo⑩ Clock Driver |
| 文件： | 总5页 (文件大小：81K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRELIMIN ARY IN FO RMAT IO N
MK74CB218
Dual 1 to 8 Buffalo™ Clock Driver
Description
Features
The MK74CB218 Buffalo™ 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.
• Tiny 28 pin SSOP (150 mil) 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, 3.3 V or 5 V supply voltages
• Output Enable tri-states each bank of eight
• Clock speeds up to 200 MHz
Family of ICS Parts
A quad 1 to 4, and PECL versions, are also
available. Consult ICS for more details.
The MK74CB218 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.
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.
VDDA
VDD
VDDB
Block Diagram
INA
QA0
INB
QB0
QA1
QA2
QA3
QA4
QA5
QA6
QA7
QB1
QB2
QB3
QB4
QB5
QB6
QB7
GND
OE (all outputs)
MDS 74CB218 A
1
Revision 021600
Printed 11/16/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
PRELIMIN ARY IN FO RMAT IO N
MK74CB218
Dual 1 to 8 Buffalo™ Clock Driver
Suggested Layout
Pin Assignment
INA
QA0
QA1
QA2
VDDA 5
VDDA
1
2
3
4
28 INB
QB0
QB1
27
26
25
24
23
A
0.01µF
G
B
QB2
VDDB
VDDB
6
7
8
9
0.01µF
G
QA3
QA4
GND
GND 10
QA5
22 QB3
21 QB4
20 GND
19 GND
18 QB5
17 QB6
16 QB7
15 VDD
11
0.01µF
QA6 12
QA7 13
OE 14
G
V
For simplicity, series 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 0.01µF
decoupling capacitors closest.
= connect to VDDB
= connect to VDDA
= connect to VDD
B
G
A
V
= connect to low
inductance ground plane
Pin Descriptions
Number
Name
Type Description
1
INA
I
Clock input for eight A outputs.
Clock A outputs.
2, 3, 4 QA0, QA1, QA2
O
P
O
P
O
I
5, 6
7, 8
VDDA
QA3, QA4
GND
Power supply for QA outputs. Connect to a voltage from 2.5V to 5V. Cannot exceed VDD.
Clock A outputs.
9, 10
Connect to ground.
11, 12, 13 QA5, QA6, QA7
Clock A outputs.
14
15
OE
Output Enable. Tri-states all clock outputs when this input is low. Internal pull-up to VDD.
VDD
P
O
P
O
P
O
I
Power supply for inputs.
16, 17, 18 QB7, QB6, QB5
Clock B outputs.
19, 20
21, 22
23, 24
GND
QB4, QB3
VDDB
Connect to ground.
Clock B outputs.
Power supply for QB outputs. Connect to a voltage from 2.5V to 5V. Cannot exceed VDD.
25, 26, 27 QB2, QB1, QB0
28 INB
Clock B outputs.
Clock input for eight B outputs.
Type: I = Input, O = output, P = power supply connection
MDS 74CB218 A
2
Revision 021600
Printed 11/16/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
PRELIMIN ARY IN FO RMAT IO N
MK74CB218
Dual 1 to 8 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
V
V
Operating Voltage, VDDA or VDDB
Input High Voltage, VIH (INA, INB pins)
Input Low Voltage, VIL (INA, INB pins)
Input High Voltage, VIH (OE pin)
2.375
VDD
VDD-1.0
VDD/2
VDD/2
V
1.0
0.8
V
2.0
V
Input Low Voltage, VIL (OE pin)
V
Output High Voltage, 3.3V and 5V
Output High Voltage, 3.3V and 5V
Output Low Voltage, 3.3V and 5V
Output High Voltage, 2.5V
IOH=-12mA
IOH=-25mA
IOL=25mA
IOH=-16mA
IOL=16mA
No Load
VDD-0.4
2.4
V
V
0.8
0.5
V
2
V
Output Low Voltage, 2.5V
V
Operating Supply Current, IDD, at 100 MHz
Output Impedance
55
14
mA
W
mA
kW
pF
Short Circuit Current
On-Chip Pull-up Resistor
Input Capacitance
Each output
OE
100
250
7
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Input Clock Frequency
Note 4
0
200
3
MH z
ns
Propagation Delay with load=15pF
Output Clock Rise Time
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 Clock A to B Skew
At VDD/2. Note 2
At VDD/2. Note 3
100
100
250
250
20
20
ps
ps
Output Enable Time, OE high to output on
Output Disable Time, OE low to tri-state
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 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.
MDS 74CB218 A
3
Revision 021600
Printed 11/16/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
PRELIMIN ARY IN FO RMAT IO N
MK74CB218
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 = VDDA = VDDB = 3.3 V, 70°C and with 33 Wseries 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
Do not operate in this area .
200
150
100
50
0
0
20
40
60
80
Load Capacitance/per pin (pF)
Graph 1
MK74CB218
Maximum Speed with all VDDs at 3.3V
MDS 74CB218 A
4
Revision 021600
Printed 11/16/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
PRELIMIN ARY IN FO RMAT IO N
MK74CB218
Dual 1 to 8 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
Min
1.35
0.10
0.20
0.18
8.55
Max
A
A1
b
0.053 0.069
0.004 0.010
0.008 0.012
0.007 0.010
0.337 0.344
.025 BSC
1.75
0.25
0.30
0.25
8.75
E1
E
c
D
e
0.635 BSC
INDEX
AREA
E
0.228 0.244
0.150 0.157
0.016 0.050
5.80
3.80
0.40
6.20
1
2
E1
L
4.00
1.27
D
A
A1
c
b
L
e
Ordering Information
Part/Order Number
Marking
Package
Temperature
MK74CB218R
MK74CB218R
MK74CB218R
28 pin SSOP
0-70 °C
0-70 °C
MK74CB218RTR
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 74CB218 A
5
Revision 021600
Printed 11/16/00
IntegratedCircuit Systems, Inc. • 525 Race Street • San Jose •CA •95126•(408) 295-9800tel • www.icst.com
相关型号：
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IDT
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