OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MK74CB218RLFTR

P1-P3P4-P6P7-P7
DATASHEET
DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER MK74CB218
IDT™ / ICS™
DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 1
MK74CB218 REV K 051310
Description
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.
A quad 1 to 4, and PECL versions, are also available.
Consult IDT 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)
• Pb (lead) free package, RoHS compliant
• 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 IDT Parts
The MK74CB218 Buffalo™ is designed to be used with
IDT’s clock synthesizer devices. The inputs of the Buffalo
are matched to the outputs of IDT clock synthesizers.
Consult IDT for applications support.
Not recommended for new designs. See the
MK74CB218B for new designs.
Block Diagram
VDD
GND
OE
(all outputs)
QB5
QB7
QB4
QB6
QB1
QB3
QB0
QB2
VDDA VDDB
INB
QA5
QA7
QA4
QA6
QA1
QA3
QA0
QA2
INA
MK74CB218
DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER
IDT™ / ICS™
DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 2
MK74CB218 REV K 051310
Pin Assignment
Suggested Layout
Pin Descriptions
18
7
17
8
16
9
15
QA3
10
QA4
11
GND
12
QB4
13
GND
14
QA5
GND
GND
QB5
QA6
QB6
VDD
QA7
QB7
22
21
20
19
OE
QB3
5
6
VDDA
VDDA
VDDB
24
23
VDDB
3
4
QA1
QA2
QB2
26
25
QB1
1
2
INA
QA0
QB0
28
27
INB
A
G
B
G
V
G
0.01 µF
0.01 µF
0.01 µF
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 µF decoupling
capacitors closest.
A
V
B
G
= connect to VDDA
= connect to VDD
= connect to VDDB
= connect to low
inductance ground plane
Pin
Number
Pin
Name
Pin
Type
Pin Description
1 INA Input Clock input for eight A outputs.
2, 3, 4 QA0, QA1, QA2 Output Clock A outputs.
5, 6 VDDA Power Power supply for QA outputs. Connect to a voltage from 2.5 V to VDD. Cannot exceed
VDD.
7, 8 QA3, QA4 Output Clock A outputs.
9, 10 GND Power Connect to ground.
11, 12, 13 QA5, QA6, QA7 Output Clock A outputs.
14 OE Input Output Enable. Tri-states all clock outputs when this input is low. Internal pull-up to VDD.
15 VDD Power Power supply for inputs.
16, 17, 18 QB7, QB6, QB5 Output Clock B outputs.
19, 20 GND Power Connect to ground.
21, 22 QB4, QB3 Output Clock B outputs.
23, 24 VDDB Power Power supply for QB outputs. Connect to a voltage from 2.5 V to VDD. Cannot exceed
VDD.
25, 26, 27 QB2, QB1, QB0 Output Clock B outputs.
28 INB Input Clock input for eight B outputs.
MK74CB218
DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER FAN OUT BUFFER
IDT™ / ICS™
DUAL 1 TO 8 BUFFALO™ CLOCK DRIVER 3
MK74CB218 REV K 051310
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 125°C. This is at
VDD = VDDA = VDDB = 3.3 V, 70°C and with 33Ω 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 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 IDT for your
specific requirement.
P1-P3P4-P6P7-P7

MK74CB218RLFTR

Mfr. #:
Buy MK74CB218RLFTR
Manufacturer:
IDT
Description:
Clock Drivers & Distribution DUAL 1 TO 8 BUFFALO CLOCK DRIVER
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet