DATASHEET
ICS508
PECL TO CMOS CONVERTER
Description
Features
The ICS508 is the most cost effective way to generate
a high quality, high frequency CMOS clock output from
a PECL clock input.
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The ICS508 has separate VDD supplies for the PECL
input buffer and the output buffer, allowing different
voltages to be used. For example, the input clock could
use a 3.3 V supply while the output operates from 2.5V.
The device has an Output Enable pin that tri-states the
clock output when the OE pin is taken low.
The ICS508 is a member of IDT’s ClockBlocksTM
family.
Packaged in 8 pin SOIC (Pb-free) or die
Separate VDD supplies allow voltage translation
Clock frequency of 0 - 250 MHz
Duty cycle of 45/55
Operating voltages of 2.375 to 5.5V
Tri-state output for board level testing
24mA output drive capability
Industrial temperature version available
Advanced, low power, sub-micron CMOS process
Block Diagram
VDDP
VDDC
P E C LIN
P E C LIN
O utput
B uffer
OE
GND
IDT™ / ICS™ PECL TO CMOS CONVERTER
1
C LK
GND
ICS508
REV H 051310
ICS508
PECL TO CMOS CONVERTER
PECL TO CMOS TRANSLATOR
Pin Assignment
VDDP
1
8
VDDC
PECLIN
2
7
CLK
PECLIN
3
6
GND
GND
4
5
OE
8 Pin (150 mil) SOIC
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
VDDP
Output
2
PECLIN
Input
Complementary PECL clock input.
3
PECLIN
Input
PECL clock input.
4
GND
Power
Connect to ground.
5
OE
Input
Output enable. Tri-states CLK output when low. Internal pull-up to
VDDC.
6
GND
Power
Connect to ground.
7
CLK
Output
Clock output.
8
VDDC
Power
Connect to 2.5 V, or 3.3 V, or 5 V. Supplies output buffer and OE pin.
Connect to 3.3V or 5V. Supplies PECL input buffer.
External Components
The ICS508 requires two 0.01µF decoupling capacitors to be connected between VDDP and GND and
between VDDC and GND. They must be connected close to the ICS508 to minimize lead inductance. A
33Ω series terminating resistor can be used next to the CLK pin.
IDT™ / ICS™ PECL TO CMOS CONVERTER
2
ICS508
REV H 051310
ICS508
PECL TO CMOS CONVERTER
PECL TO CMOS TRANSLATOR
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS508. 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, VDDP and VDDC
7V
PECL Inputs
-0.5 V to VDDP+0.5 V
Clock Output and OE Pin
-0.5 V to VDDC+0.5 V
Ambient Operating Temperature, ICS508
0 to +70° C
Ambient Operating Temperature, ICS508MI
-40 to +85° C
Storage Temperature
-65 to +150° C
Soldering Temperature
260° C
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
Units
Ambient Operating Temperature, ICS508M
0
+70
°C
Ambient Operating Temperature, ICS508MI
-40
+85
°C
+3.15
+3.45
V
Power Supply Voltage (measured in respect to GND)
Reference crystal parameters
Refer to page 3
DC Electrical Characteristics
VDDP = VDDC =3.3V ±5% , Ambient temperature 0 to +70° C, unless stated otherwise
Parameter
Operating Voltage
Symbol
Conditions
Min.
Typ.
Max.
Units
VDD
VDDP
3
5.5
V
VDD
VDDC
2.375
5.5
V
0.3
1
V
Peak to Peak Input Voltage
PECLIN
Common Mode Range
PECLIN
VDDP = 5 V
VDDP - 3.7
VDDP - 0.6
V
PECLIN
VDDP = 3.3 V
VDDP - 2.0
VDDP - 0.6
V
2
VDDC
V
0.8
V
Input High Voltage
VIH
OE only
Input Low Voltage
VIL
OE only
IDT™ / ICS™ PECL TO CMOS CONVERTER
3
ICS508
REV H 051310
ICS508
PECL TO CMOS CONVERTER
Parameter
Output High Voltage
Output Low Voltage
PECL TO CMOS TRANSLATOR
Symbol
VOH
VOL
Conditions
Min.
Typ.
Max.
Units
VDDC = 5 V
IOH = -24 mA
VDDC - 0.4
V
VDDC = 3.3 V
IOH = -18 mA
VDDC - 0.4
V
VDDC = 2.5 V
IOH = -8 mA
VDDC - 0.4
V
VDDC = 5 V
IOL = 24 mA
0.4
V
VDDC = 3.3 V
IOL = 18 mA
0.4
V
VDDC = 2.5 V
IOL = 8 mA
0.4
V
On Chip Pull-up Resistor
RPU
OE
250
kΩ
Operating Supply Current
IDDP
100 MHz, no load
1.5
mA
IDDC
100 MHz, no load
8
mA
Note 1: VDDP must always be greater than or equal to VDDC
AC Electrical Characteristics
VDDP = VDDC = 3.3V±5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Input Frequency
Output Clock Rise Time
Symbol
Conditions
fIN
Min. Typ. Max. Units
0
250
MHz
100 MHz
0.8 V to 2.0 V, VDDP=VDDC = 5 V
0.4
ns
100 MHz
0.8 V to 2.0 V, VDDP=VDDC=3.3 V
0.6
ns
100 MHz
0.8 V to 2.0 V, VDDP=VDDC=2.5 V
1
ns
100 MHz
2.0 V to 0.8 V, VDDP=VDDC = 5 V
0.4
ns
100 MHz
2.0 V to 0.8 V, VDDP=VDDC=3.3 V
0.6
ns
100 MHz
2.0 V to 0.8 V, VDDP=VDDC=2.5 V
1
ns
Output Enable Time
100 MHz
OE high to output on 0 - 100 MHz
7
20
ns
Output Disable Time
100 MHz
OE low to tri-state 0 - 100 MHz
7
20
ns
VDDP = 5 V, VDDC = 5 V,
4
6
ns
100 MHz VDDP = 5 V, VDDC = 3.3 V
4.5
7
ns
100 MHz VDDP = 5 V, VDDC = 2.5 V
5.5
9
ns
100 MHz VDDP = 3.3 V, VDDC = 3.3 V
4.5
7
ns
VDDP = 3.3 V, VDDC = 2.5 V
5.5
9
ns
55
%
Output Clock Fall Time
Propagation Delay
Output Clock Duty
Cycle 0 - 100 MHz
IDT™ / ICS™ PECL TO CMOS CONVERTER
Any VDD combination
4
45
ICS508
REV H 051310
ICS508
PECL TO CMOS CONVERTER
Parameter
PECL TO CMOS TRANSLATOR
Symbol
Output Clock Duty
Cycle
100 - 166 MHz
Output Clock Duty
Cycle
166 - 250 MHz
Conditions
Min. Typ. Max. Units
VDDP = 5 V, VDDC = 5 V
45
55
%
VDDP = 5 V, VDDC = 3.3 V
45
55
%
VDDP = 5 V, VDDC = 2.5 V
40
60
%
VDDP = 3.3 V, VDDC = 3.3 V
40
60
%
VDDP = 3.3 V, VDDC = 2.5 V
45
55
%
VDDP = 5 V, VDDC = 5 V
40
60
%
VDDP = 5 V, VDDC = 3.3 V
40
60
%
VDDP = 5 V, VDDC = 2.5 V
35
65
%
VDDP = 3.3 V, VDDC = 3.3 V
35
65
%
VDDP = 3.3 V, VDDC = 2.5 V
40
60
%
Thermal Characteristics
Parameter
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
IDT™ / ICS™ PECL TO CMOS CONVERTER
Symbol
Conditions
Min.
Typ.
Max. Units
θJA
Still air
150
° C/W
θJA
1 m/s air flow
140
° C/W
θJA
3 m/s air flow
120
° C/W
40
° C/W
θJC
5
ICS508
REV H 051310
ICS508
PECL TO CMOS CONVERTER
PECL TO CMOS TRANSLATOR
Marking Diagrams
508MILF
######
YYWW
508MLF
######
YYWW
Notes:
1. ###### is the lot number
2. YYWW is the last two digits of the year and the week number that the part was assembled.
3. “I” denotes industrial temperature range.
4. “LF” denotes Pb-free.
5. Bottom marking: country of origin if not USA.
IDT™ / ICS™ PECL TO CMOS CONVERTER
6
ICS508
REV H 051310
ICS508
PECL TO CMOS CONVERTER
PECL TO CMOS TRANSLATOR
Package Outline and Package Dimensions (8 pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
8
Millimeters
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°
A
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°
h x 45
A1
C
-Ce
SEATING
PLANE
B
L
.10 (.004)
C
*Ordering Information
Part / Order Number
508MLF
508MLFT
508MILF
508MILFT
508-DWF
508-DPK
Marking
see page 6
-
Shipping Packaging
Package
Temperature
Tubes
8 pin SOIC
Tape and Reel
8 pin SOIC
Tubes
8 pin SOIC
Tape and Reel
8 pin SOIC
Die on uncut, probed wafers
Tested die in waffle pack
0 to +70° C
0 to +70° C
-40 to +85° C
-40 to +85° C
0 to +70° C
0 to +70° C
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™ / ICS™ PECL TO CMOS CONVERTER
7
ICS508
REV H 051310
ICS508
PECL TO CMOS CONVERTER
PECL TO CMOS TRANSLATOR
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For Tech Support
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408-284-8200
Fax: 408-284-2775
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