DATASHEET
MK2304-2
ZERO DELAY, LOW SKEW BUFFER
Description
Features
The MK2304-2 is a low jitter, low skew, high performance
Phase Lock Loop (PLL) based zero delay buffer for high
speed applications. Based on IDT’s proprietary low jitter
PLL techniques, the device provides four low skew outputs
at speeds up to 133 MHz at 3.3 V. The MK2304-2 includes
a bank of two outputs running at 1/2X. In the zero delay
mode, the rising edge of the input clock is aligned with the
rising edges of all 4 outputs. Compared to competitive
CMOS devices, the MK2304-2 has the lowest jitter.
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The MK2304-2 PLL enters a power-down state when there
are no rising edges on the REF input. In this mode, all
outputs are tri-stated and the PLL is turned off, resulting in
leass than 25 µA of current draw.
• Spread SmartTM technology works with spread spectrum
Packaged in 8 pin SOIC
Zero input-output delay
Two 1X outputs plus two 1/2X outputs
Output to output skew is less than 200 ps
Output clocks up from 10 MHz to 133 MHz at 3.3 V
Ability to generate 2X the input
Full CMOS outputs with 8 mA output drive capability at
TTL levels at 3.3 V
clock generators
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IDT manufactures the largest variety of clock generators
and buffers and is the largest clock supplier in the world.
Advanced, low power, sub micron CMOS process
Operating voltage of 3.3 V
Available in industial temperature operation
Pb (lead) free package
Low Standby Current
Block Diagram
VDD
1
FBIN
CLKIN
CLKA1
PLL
CLKA2
BANK
A
CLKB1
/2
CLKB2
BANK
B
1
GND
IDT™ ZERO DELAY, LOW SKEW BUFFER
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MK2304-2
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Pin Assignment
Feedback Configuration Table
REF
1
8
FBK
CLKA1
2
7
VDD
CLKA2
3
6
CLKB2
GND
4
5
CLKB1
Feedback From
Bank A
Bank B
CLKA1:A2
CLKIN
2XCLKIN
CLKB1:B2
CLKIN/2
CLKIN
8 Pi n ( 150 mi l ) SOI C
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
REF
Input
2
CLKA1
Output
Clock A1 output.
3
CLKA2
Output
Clock A2 output.
4
GND
Power
Connect to ground.
5
CLKB1
Output
Clock B1 output.
6
CLKB1
Output
Clock B2 output.
7
VDD
Power
3.3V Power Supply.
8
FBK
Input
PLL feedback input
Clock input. Connect to input clock source, 5 V tolerant input.
External Components
The Mk2304-2 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.1µF should be connected between VDD and GND, as close to the part as possible. A 33Ω series terminating
resistor should be used on each clock output to reduce reflections.
IDT™ ZERO DELAY, LOW SKEW BUFFER
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Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK2304-2. These ratings, which are
standard values for IDT 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
Rating
Supply Voltage, VDD
7V
All Inputs and Outputs, except CLKIN
-0.5 V to VDD+0.5 V
CLKIN
-0.5 V to +5.5 V
Ambient Operating Temperature (commercial)
0 to +70 ° C
Ambient Operating Temperature (industrial)
-40 to +85 ° C
Storage Temperature
-65 to +150 ° C
Junction Temperature
125 ° C
Soldering Temperature
260 ° C
Recommended Operation Conditions
Parameter
Min.
Max.
Units
0
+70
°C
Ambient Operating Temperature (industrial)
-40
+85
°C
Power Supply Voltage (measured in respect to GND)
+3.0
+3.6
V
Ambient Operating Temperature (commercial)
Typ.
DC Electrical Characteristics
VDD=3.3 V ±10%, Amb temp -40° C to 85° C
Parameter
Symbol
Conditions
Min.
Typ.
Operating Voltage
VDD
3.0
Input High Voltage
VIH
2
Input Low Voltage
VIL
Output High Voltage
VOH
IOH = -8 mA
Output Low Voltage
VOL
IOL = 8 mA
Operating Supply Current
100 MHz, CLKIN
IDD
No Load
45
Stand by Supply Current
0 MHz, CLKIN
IDD
No Load
12
Short Circuit Current
IOS
Each output
Input Capacitance
CIN
FBIN
Units
3.6
V
V
0.8
Power-up Time
IDT™ ZERO DELAY, LOW SKEW BUFFER
Max.
2.4
V
0.4
V
mA
25
uA
TBD
mA
7
pF
50
3
V
MK2304-2
ms
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ZERO DELAY, LOW SKEW BUFFER
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AC Electrical Characteristics
VDD = 3.3V ±10%, Ambient Temperature -40° C to 85° C
Parameter
Symbol
Conditions
Min.
Typ.
Max. Units
Output Frequency
FBIN to CLKA1,
30 pF Load
10
100
MHz
Output Frequency
FBIN to CLKA1,
15 pf Load
10
133
MHz
Output Rise Time
tOR
0.8 to 2.0 V, CL=30 pF
2.2
ns
Output Rise Time
tOR
0.8 to 2.0 V, CL=15 pF
1.5
ns
Output Fall Time
tOF
0.8 to 2.0 V, CL=30 pF
2.2
ns
Output Fall Time
tOF
0.8 to 2.0 V, CL=15 pF
1.5
ns
Output Clock Duty Cycle
At 1.4 V, CL=30 pf
40
50
60
%
Output Clock Duty Cycle
At 1.4 V, CL=15 pf
45
50
65
%
Device-to-Device skew, equally
loaded
Rising edges at VDD/2
500
ps
Output-to-Output skew, equally
loaded, On same bank
Rising edges at VDD/2
200
ps
Skew from Output Bank A to
Output Bank B
All outputs equally
loaded
400
ps
Delay CLKIN Rising Edge to
FBIN Rising Edge
Measured at VDD/2
±250
ps
Cycle-to-Cycle Jitter
30 pF loads
66.67 MHz outputs
400
ps
15 pF loads
66.67 MHz outputs
375
ps
1
ms
PLL Lock Time
Stable power supply,
valid clocks on CLKIN,
FBIN
tLOCK
Thermal Characteristics
Parameter
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
IDT™ ZERO DELAY, LOW SKEW BUFFER
Symbol
Conditions
Min.
Typ.
Max. Units
θJA
Still air
120
° C/W
θJA
1 m/s air flow
115
° C/W
θJA
3 m/s air flow
105
° C/W
58
° C/W
θJC
4
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Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
8
Symbol
E
A
A1
B
C
D
E
e
H
h
L
α
H
INDEX
AREA
1 2
D
Min
Max
1.35
1.75
0.10
0.25
0.33
0.51
0.19
0.25
4.80
5.00
3.80
4.00
1.27 BASIC
5.80
6.20
0.25
0.50
0.40
1.27
0°
8°
Inches*
Min
Max
.0532
.0688
.0040
.0098
.013
.020
.0075
.0098
.1890
.1968
.1497
.1574
0.050 BASIC
.2284
.2440
.010
.020
.016
.050
0°
8°
*For reference only. Controlling dimensions are in mm.
A
h x 45
A1
C
-Ce
B
SEATING
PLANE
L
.10 (.004)
C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
MK2304S-2LF
2304S02L
Tubes
8-pin SOIC
0 to 70° C
MK2304S-2LFTR
2304S02L
Tape and Reel
8-pin SOIC
0 to 70° C
MK2304S-2ILF
2304S2IL
Tubes
8-pin SOIC
-40° C to 85° C
MK2304S-2ILFTR
2304S2IL
Tape and Reel
8-pin SOIC
-40° C to 85° C
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 Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT
does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
IDT™ ZERO DELAY, LOW SKEW BUFFER
5
MK2304-2
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MK2304-2
ZERO DELAY, LOW SKEW BUFFER
ZDB
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