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PCS2I9940LG-32-LT 参数 Datasheet PDF下载

PCS2I9940LG-32-LT图片预览
型号: PCS2I9940LG-32-LT
PDF下载: 下载PDF文件 查看货源
内容描述: 低电压1:18时钟分配芯片 [Low Voltage 1:18 Clock Distribution Chip]
分类和应用: 时钟
文件页数/大小: 13 页 / 485 K
品牌: PULSECORE [ PulseCore Semiconductor ]
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September 2006
rev 1.1
Low Voltage 1:18 Clock Distribution Chip
Features
PCS2I9940L
With low output impedance (≈20Ω), in both the HIGH and
LVPECL or LVCMOS Clock Input
2.5V LVCMOS Outputs for Pentium II
Microprocessor Support*
150pS Maximum Output-to-Output Skew
Maximum Output Frequency of 250MHz
32 Lead LQFP & TQFP Packaging
Dual or Single Supply Device:
Dual V
CC
Supply Voltage, 3.3V Core and 2.5V
Output
Single 3.3V V
CC
Supply Voltage for 3.3V Outputs
Single 2.5V V
CC
Supply Voltage for 2.5V I/O
Pin and Function compatible to MPC940L,
MPC9109, CY29940 and CY29940-1
LOW logic states, the output buffers of the PCS2I9940L are
ideal for driving series terminated transmission lines. With a
20Ω output impedance the PCS2I9940L has the capability
of driving two series terminated lines from each output.
This gives the device an effective fanout of 1:36.
The differential LVPECL inputs of the PCS2I9940L allow
the device to interface directly with a LVPECL fanout buffer
to build very wide clock fanout trees or to couple to a high
frequency clock source. The LVCMOS input provides a
more standard interface for applications requiring only a
single clock distribution chip at relatively low frequencies. In
addition, the two clock sources can be used to provide for a
test clock interface as well as the primary system clock. A
logic HIGH on the LVCMOS_CLK_Sel pin will select the
LVCMOS level clock input. All inputs of the PCS2I9940L
have internal
open if unused.
The PCS2I9940L is a single or dual supply device. The
device power supply offers a high degree of flexibility. The
device can operate with a 3.3V core and 3.3V output, a
3.3V core and 2.5V outputs as well as a 2.5V core and
2.5V outputs. The 32-lead LQFP and TQFP Packages
were chosen to optimize performance, board space and
cost of the device. The 32-lead LQFP and TQFP Packages
have a 7x7mm
2
body size with conservative 0.8mm pin
spacing.
pullup/pulldown resistor, so they can be left
Functional Description
The PCS2I9940L is a 1:18 low Voltage Clock distribution
chip with 2.5V or 3.3V LVCMOS output capabilities. The
device features the capability to select either a differential
LVPECL or LVCMOS compatible input. 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 150pS,
the PCS2I9940L is ideal as 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 microprocessor based design.
* Pentium II is a trademark of Intel Corporation
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.