ICSI ICS2309 User Manual
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ICS2309
3.3 VOLT ZERO DELAY, LOW SKEW BUFFER
Description
The ICS2309 is a low phase noise, high-speed PLL
based, low-skew zero delay buffer. Based on ICS’
proprietary low jitter Phase Locked Loop (PLL)
techniques, the device provides eight low skew outputs
at speeds up to 133 MHz at 3.3 V. The outputs can be
generated from the PLL (for zero delay), or directly
from the input (for testing), and can be set to tri-state
mode or to stop at a low level. The PLL feedback is
on-chip and is obtained from the CLKOUT pad.
The ICS2309 is available in two different versions. The
ICS2309-1 is the base part. The ICS2309-1H is a high
drive version with faster rise and fall times.
Block Diagram
VDD
2
Features
• Clock outputs from 10 to 133 MHz
• Zero input-output delay
• Eight low skew (<250 ps) outputs
• Device-to-device skew <700 ps
• Full CMOS outputs with 25 mA output drive
capability at TTL levels
• 5 V tolerant CLKIN
• Tri-state mode for board-level testing
• Advanced, low power, sub-micron CMOS process
• Operating voltage of 3.3 V
• Industrial temperature range available
• Packaged in 16-pin SOIC and TSSOP (-1H version
only)
• Pb (lead) free package available for -1H version
(16-pin TSSOP only)
CLKIN
S2, S1
MDS 2309 D 1 Revision 052405
2
PLL
Control
Logic
GND
0
CLKOUT
1
CLKA1
CLKA2
CLKA3
CLKA4
CLKB1
CLKB2
CLKB3
CLKB4
2
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
Pin Assignment
ICS2309
3.3 VOLT ZERO DELAY, LOW SKEW BUFFER
CLKIN
CLKA1
CLKA2
VDD
GND
CLKB1
CLKB2
S2
1
2
3
4
5
6
7
8
16 pin narrow (150 mil) SOIC
16
15
14
13
12
11
10
CLKOUT
CLKA4
CLKA3
VDD
GND
CLKB4
CLKB3
S1
9
Output Clock Mode Select Table
S2 S1 CLKA1:A4 CLKB1:B4 A & B Source PLL Status
0 0 Tri-state (note 1) Tri-state (note 1) PLL OFF
0 1 Running Tri-state (note 1) PLL ON
1 0 Running Running CLKIN (note 2) OFF
1 1 Running Running PLL ON
Note 1. Outputs are in high impedance state
Note 2. Buffer mode only; not zero delay between input and output
Pin Descriptions
Pin
Number
1 CLKIN Input Clock input (5 V tolerant).
2 - 3 CLKA1:A4 Output Clock outputs A1:A4. See table above.
4 VDD Power Power supply. Connect to 3.3 V.
5 GND Power Connect to ground.
6 - 7 CLKB1:B4 Output Clock outputs B1:B4. See table above.
8 S2 Input Select input 2. See table above. Internal pull-up.
9 S1 Input Select input 1. See table above. Internal pull-up.
10 - 11 CLKB1:B4 Output Clock outputs B1:B4. See table above.
12 GND Power Connect to ground.
13 VDD Power Power supply. Connect to 3.3 V.
14 - 15 CLKA1:A4 Output Clock outputs A1:A4. See table above.
16 CLKOUT Input Buffered output. Internall feedback on this pin.
MDS 2309 D 2 Revision 052405
Pin
Name
Pin Type Pin Description
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
External Components
The ICS2309 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.01 mF should be connected between VDD and GND on pins 4 and 5, and VDD and GND
on pins 13 and 12, as close to the device as possible. A series termination resistor of 33Ω may be used to
each clock output pin to reduce reflections.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS2309. 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 Rating
Supply Voltage, VDD 7 V
All Inputs and Outputs -0.5 V to VDD+0.5 V
CLKIN and FBIN inputs -0.5 V to 5.5 V
Electrostatic Discharge (HBM) 2000 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 150°C
Soldering Temperature 260°C
ICS2309
3.3 VOLT ZERO DELAY, LOW SKEW BUFFER
Recommended Operation Conditions
Parameter Min. Typ. Max. Units
Ambient Operating Temperature (Industrial) -40 +85 °C
Ambient Operating Temperature (Commercial) 0 +70 °C
Power Supply Voltage (measured in respect to GND) +3.0 +3.6 V
MDS 2309 D 3 Revision 052405
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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