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ASM2I99448G-32-LT Datasheet

  • ASM2I99448G-32-LT

  • 3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer

  • 15頁(yè)

  • ALSC

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May 2005
rev 0.3
3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer
Features
12 LVCMOS compatible clock outputs
Selectable LVCMOS and differential LVPECL
compatible clock inputs
Maximum clock frequency of 350MHz
Maximum clock skew of 150pS
Synchronous output stop in logic low state
eliminates output runt pulses
High鈥搃mpedance output control
3.3V or 2.5V power supply
Drives up to 24 series terminated clock lines
Ambient temperature range 鈥?0擄C to +85擄C
32鈥揕ead LQFP & TQFP packaging
Supports
clock
distribution
in
networking,
ASM2I99448
The ASM2I99448 is specifically designed to distribute
LVCMOS compatible clock signals up to a frequency of
350MHz. Each output provides a precise copy of the input
signal with a near zero skew. The outputs buffers support
driving of 50鈩?terminated transmission lines on the incident
edge: each output is capable of driving either one parallel
terminated or two series terminated transmission lines.
Two selectable, independent clock inputs are available,
providing support of LVCMOS and differential LVPECL
clock distribution systems. The ASM2I99448 CLK_STOP
control is synchronous to the falling edge of the input clock.
It allows the start and stop of the output clock signal only in
a logic low state, thus eliminating potential output runt
pulses. Applying the OE control will force the outputs into
high鈥搃mpedance mode.
All inputs have an internal pull鈥搖p or pull鈥揹own resistor
preventing unused and open inputs from floating. The
device supports a 2.5V or 3.3V power supply and an
ambient temperature range of 鈥?0擄C to +85擄C. The
ASM2I99448
is
pin
and
function
compatible
but
telecommunication and computing applications
Pin and Function compatible to MPC9448 and
MPC948
Functional Description
The ASM2I99448 is a 3.3V or 2.5V compatible, 1:12 clock
fanout buffer targeted for high performance clock tree
applications. With output frequencies up to 350 MHz and
output skews less than 150 pS, the device meets the needs
of most demanding clock applications.
performance鈥揺nhanced to the MPC948.
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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