PECL to CMOS Converter - Integrated Circuit Systems
Description
PRELIMINARY INFORMATION
ICS508 PECL to CMOS Converter
Description
The ICS508 is the most cost effective way to generate a high quality, high frequency CMOS clock output from a PECL clock input.
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.
5 V.
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 the ClockBlocks™ family of devices.
Features
• Packaged as 8 pin SOIC 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.
5 V • Tri-state output for board level testing • 24 mA drive capability • Industrial temperature version available • Advanced, low power CMOS process
Block Diagram
VDDP VDDC
PECLIN PECLIN
Output Buffer
CLK
GND
OE
GND
1 Revision 012400 Printed 11/13/00 Integrated Circuit Systems, Inc.
• 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.
icst.
com
MDS 508 C
PRELIMINARY INFORMATION
ICS508 PECL to CMOS Converter
Pin Assignment
VDDP PECLIN PECLIN GND 1 2 3 4 8 7 6 5 VDDC CLK GND OE
Pin Descriptions
Number 1 2 3 4 5 6 7 8 Name VDDP PECLIN PECLIN GND OE GND CLK VDDC Type O I I P I P O P Description Connect to 3.
3 V or 5 V.
Supplies PECL input buffer.
Complementary PECL clock input.
PECL clock input.
Connect to ground.
Output enable.
Tri-states CLK output when low.
Internal pull-up to VDDC.
Connect to ground.
Clock output.
Connect to 2.
5 V, or 3.
3 V or 5 V.
Supplies output buffer and OE pin.
Key: I = Input, O = output, P = power supply connection
2 Revision 012400 Printed 11/13/00 Integrated Circuit Systems, Inc.
• 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.
icst.
com
MDS 508 C
PRELIMINARY INFORMATION
ICS508 PECL to CMOS Converter
Electrical Specifications
Parameter Supply Voltage, VDDP and...
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