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ASM2I9942CG-32-LT Datasheet

  • ASM2I9942CG-32-LT

  • Low Voltage 1:18 Clock Distribution Chip

  • 10頁(yè)

  • ALSC

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May 2005
rev 0.2
Low Voltage 1:18 Clock Distribution Chip
Features
LVCMOS/LVTTL Clock Input
2.5V
LVCMOS
Outputs
for
Pentium
II
TM*
ASM2I9942C
device ideal for supplying clocks for a high performance
Pentium II
TM
microprocessor based design.
With a low output impedance (鈮?2鈩?, in both the HIGH and
LOW logic states, the output buffers of the ASM2I9942C
are ideal for driving series terminated transmission lines.
With an output impedance of 12鈩? the ASM2I9942C can
drive two series terminated transmission lines from each
output. This capability gives the ASM2I9942C an effective
fanout of 1:36. The ASM2I9942C provides enough copies
of low skew clocks for most high performance synchronous
systems.
The LVCMOS/LVTTL input of the ASM2I9942C provides a
more standard LVCMOS interface. The OE pins will place
the outputs into a high impedance state. The OE pin has an
internal pullup resistor.
The ASM2I9942C is a single supply device. The V
CC
power
pins require either 2.5V or 3.3V. The 32鈥搇ead TQFP and
LQFP package is chosen to optimize performance, board
space and cost of the device. The 32鈥搇ead TQFP has a
7x7mm
2
body size with a conservative 0.8mm pin spacing.
Microprocessor Support
150pS Maximum Targeted Output鈥搕o鈥揙utput Skew
Maximum Output Frequency of 250MHz @ 3.3 V
CC
32鈥揕ead TQFP and LQFP Packaging
Single 3.3V or 2.5V Supply.
Pin and Function compatible to MPC942C
.
Functional Description
The ASM2I9942C 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 ASM2I9942C has an
LVCMOS input clock while the ASM2I9942P has an
LVPECL input clock. The 18 outputs are 2.5V or 3.3V
LVCMOS compatible and feature the drive strength to drive
50鈩?series or parallel terminated transmission lines. With
output鈥搕o鈥搊utput skews of 200pS, the ASM2I9942C is
ideal as a clock distribution chip for the most demanding of
synchronous systems. The 2.5V outputs also make the
*Pentium II is a trademark of Intel Corporation
Alliance Semiconductor
2575, Augustine Drive
鈥?/div>
Santa Clara, CA
鈥?/div>
Tel: 408.855.4900
鈥?/div>
Fax: 408.855.4999
鈥?/div>
www.alsc.com
Notice: The information in this document is subject to change without notice.

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