September 2006
rev 0.3
Low Voltage 1:18 Clock Distribution Chip
Features
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LVCMOS/LVTTL Clock Input
2.5V
150pS
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
.
LVCMOS
Maximum
Outputs
Targeted
for
PentiumII
TM
Microprocessor Support
Output–to–Output
PCS2I9942C
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.
Functional Description
The LVCMOS/LVTTL input of the PCS2I9942C provides a
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
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
7x7mm
2
body size with a conservative 0.8mm pin spacing.
more standard LVCMOS interface. The OE pins will place
the outputs into a high impedance state. The OE pin hPcs
an internal pullup resistor.
*Pentium II is a trademark of Intel Corporation
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008
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Tel: 408-879-9077
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Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
PULSECORE [ PulseCore Semiconductor ]
