DATASHEET
MULTIPLIER AND ZERO DELAY BUFFER
Description
The ICS2402 is a high-performance Zero Delay Buffer
(ZDB) which integrates IDT’s proprietary analog/digital
Phase-Locked Loop (PLL) techniques. The chip is part
of IDT’s ClockBlocks
TM
family and was designed as a
performance upgrade to meet today’s higher speed and
lower voltage requirements. The zero delay feature
means that the rising edge of the input clock aligns with
the rising edges of both output clocks, giving the
appearance of no delay through the device.
The ICS2402 is ideal for synchronizing outputs in a
large variety of systems, from personal computers to
data communications to graphics/video. By allowing
off-chip feedback paths, the device can eliminate the
delay through other devices.
ICS2402
Features
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8-pin SOIC package
Available in Pb (lead) free package
Absolute jitter ±100 ps
Propagation Delay of ±600 ps
Output multiplier of 2X
Output clock frequency up to 80 MHz
Can recover degraded input clock duty cycle
Output clock duty cycle of 45/55
Full CMOS clock swings with 25 mA drive capability
at TTL levels
Advanced, low power CMOS process
Operating voltage of 3.3 V or 5 V
NOTE: EOL for non-green parts to occur on
5/13/10 per PDN U-09-01
Block Diagram
ICLK
S0
FBIN
divide
by N
Phase
Detector,
Charge
Pump,
and
Loop
Filter
VCO
CLK1
IDT™ / ICS™
MULTIPLIER AND ZERO DELAY BUFFER
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ICS2402
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ICS2402
MULTIPLIER AND ZERO DELAY BUFFER
ZDB AND MULTIPLIER
Pin Assignment
ICLK
NC
GND
FBIN
1
2
3
4
8
7
6
5
CLK
VDD
S0
NC
8 pin (150 mil) SOIC
Clock Multiplier Decoding Table 1
(Multiplies Input clock by shown amount)
S0
0
1
CLK
2 X ICLK
ICLK
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
ICLK
NC
GND
FBIN
NC
S0
VDD
CLK
Pin
Type
Input
—
Power
Input
—
Input
Power
Output
Pin Description
Reference clock input.
No connect. Do not connect to anything.
Connect to ground.
Feedback clock input.
No connect. Do not connect to anything.
Select pin for Clock Multiplier Decoding Table above.
Connect to +3.3 V or +5.0 V.
Clock output per table above.
IDT™ / ICS™
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ZDB AND MULTIPLIER
External Components
The ICS2402 requires a 0.01µF decoupling capacitor to be connected between VDD and GND. It must be
connected close to the part to minimize lead inductance. No external power supply filtering is required for
this device. A 33Ω series terminating resistor can be used next to each output pin.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS2402. 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
Supply Voltage, VDD
All Inputs and Outputs
Ambient Temperature under Bias
Storage Temperature
Junction Temperature
Power Dissipation
7V
Rating
-0.5 V to VDD+0.5 V
-55 to 125° C
-65 to +150° C
125° C
0.5 W
Recommended Operation Conditions
Parameter
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Power Supply Voltage (measured in respect to GND)
Min.
0
+4.5
+3.15
Typ.
+5.0
+3.3
Max.
+70
+5.5
+3.45
Units
°
C
V
V
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ZDB AND MULTIPLIER
DC Electrical Characteristics
VDD = 3.3 V ±5%,
Ambient Temperature 0 to +70° C
Parameter
Operating Voltage
Operating Current
Input High Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
Short Circuit Current
Input Capacitance
Symbol Conditions
VDD
IDD
V
IH
V
IL
V
OH
V
OL
I
OS
C
IN
ICLK, FBIN, S0
ICLK, FBIN, S0
I
OH
= -12 mA
I
OL
= 12 mA
CLK
S0
Min.
3.15
Typ.
20
Max.
3.45
Units
V
mA
V
2
0.8
2.4
0.4
±50
5
V
V
V
mA
pF
VDD = 5 V ±10%,
Ambient Temperature 0 to +70° C
Parameter
Operating Voltage
Operating Current
Input High Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
Short Circuit Current
Input Capacitance
Symbol Conditions
VDD
IDD
V
IH
V
IL
V
OH
V
OL
I
SC
C
IN
ICLK, FBIN, S0
ICLK, FBIN, S0
I
OH
= -12 mA
I
OL
= 12 mA
Each output
S0
5V
Min.
4.5
Typ.
30
Max.
5.5
Units
V
mA
V
0.7xVDD
0.2xVDD
4.5
0.5
±80
5
V
V
V
mA
pF
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ICS2402
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MULTIPLIER AND ZERO DELAY BUFFER
ZDB AND MULTIPLIER
AC Electrical Characteristics
VDD = 3.3 V ±5%, or 5 V ±10%,
Ambient Temperature 0 to +70° C
Parameter
Input Frequency, ICLK
Output Frequency, CLK
Input to Output Jitter
Absolute Short-term Jitter,
peak-to-peak
Input to Output Skew
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle
Symbol
Conditions
S0=1
S0=0
CLK>20 MHz, Note 2
Note 2
Note 1
20% to 80%, Note 2
80% to 20%, Note 2
At VDD/2, Note 2
Min.
10
10
10
Typ.
Max. Units
80
40
80
MHz
MHz
MHz
ps
ps
600
ps
ns
ns
55
%
200
±100
-600
1.5
1.5
45
50
Note 1: Assumes clocks with same rise time, measured from rising edges at VDD/2
Note 2: Measured with a 15 pF load.
Thermal Characteristics
Parameter
Thermal Resistance Junction to
Ambient
Symbol
θ
JA
θ
JA
θ
JA
θ
JC
Conditions
Still air
1 m/s air flow
3 m/s air flow
Min.
Typ.
150
140
120
40
Max. Units
°
C/W
°
C/W
°
C/W
°
C/W
Thermal Resistance Junction to Case
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ICS2402
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