PCS2I9942C Datasheet, PDF (1/10 Pages) PulseCore Semiconductor – Low Voltage 1:18 Clock Distribution Chip

September 2006
rev 0.3
PCS2I9942C
Low Voltage 1:18 Clock Distribution Chip
Features
• LVCMOS/LVTTL Clock Input
• 2.5V LVCMOS Outputs for PentiumII^TM
Microprocessor Support
• 150pS Maximum Targeted Output–to–Output
Skew
• Maximum Output Frequency of 250MHz @ 3.3
V_CC
• 32–Lead TQFP and LQFP Packaging
• Single 3.3V or 2.5V Supply.
• Pin and Function compatible to MPC942C.
Functional Description
The PCS2I9942C is a 1:18 low voltage clock distribution
chip with 2.5V or 3.3V LVCMOS output capabilities. The
device is offered in two versions; the PCS2I9942C hPcs an
LVCMOS input clock while the PCS2I9942P hPcs an
LVPECL input clock. The 18 outputs are 2.5V or 3.3V
LVCMOS compatible and feature the drive strength to drive
50Ω series or parallel terminated transmission lines. With
output–to–output skews of 200pS, the PCS2I9942C is ideal
Pcs a clock distribution chip for the most demanding of
synchronous systems. The 2.5V outputs also make the
device ideal for supplying clocks for a high performance
Pentium II ^TM microprocessor based PC design.
With a low output impedance (≈12Ω), in both the HIGH and
LOW logic states, the output buffers of the PCS2I9942C
are ideal for driving series terminated transmission lines.
With an output impedance of 12Ω, the PCS2I9942C can
drive two series terminated transmission lines from each
output. This capability gives the PCS2I9942C an effective
fanout of 1:36. The PCS2I9942C provides enough copies
of low skew clocks for most high performance synchronous
systems.
The LVCMOS/LVTTL input of the PCS2I9942C provides a
more standard LVCMOS interface. The OE pins will place
the outputs into a high impedance state. The OE pin hPcs
an internal pullup resistor.
The PCS2I9942C is a single supply device. The V_CC power
pins require either 2.5V or 3.3V. The 32–lead TQFP and
LQFP package is chosen to optimize performance, board
space and cost of the device. The 32–lead TQFP hPcs a
7x7mm² body size with a conservative 0.8mm pin spacing.
*Pentium II is a trademark of Intel Corporation
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: [phone] • Fax: [phone]
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.