Datasheet > ASM2I9942C

ASM2I9942C

更新时间： 2024-11-26 22:11:55

品牌	Logo	应用领域
ALSC		时钟
页数	文件大小	规格书
10页	431K
描述
Low Voltage 1:18 Clock Distribution Chip

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ASM2I9942C 数据手册

May 2005

rev 0.2

ASM2I9942C

Low Voltage 1:18 Clock Distribution Chip

Features

device ideal for supplying clocks for a high performance

Pentium II ^TMmicroprocessor based design.

LVCMOS/LVTTL Clock Input

2.5V LVCMOS Outputs for Pentium II^TM*

With a low output impedance (≈12Ω), 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 12Ω, 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.

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 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 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

50Ω series or parallel terminated transmission lines. With

output–to–output 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

The ASM2I9942C is a single supply device. The V_CCpower

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 has a

7x7mm²body size with a conservative 0.8mm pin spacing.

*Pentium II is a trademark of Intel Corporation

Alliance Semiconductor

2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com

Notice: The information in this document is subject to change without notice.

12 3 4 5 6 7...10

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与ASM2I9942C相关器件

型号	品牌	获取价格	描述	数据表
ASM2I9942C-32-ER	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942C-32-ET	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942C-32-LR	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942C-32-LT	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942CG-32-ER	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942CG-32-ET	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942CG-32-ET	PULSECORE	获取价格	Low Skew Clock Driver, 9942 Series, 18 True Output(s), 0 Inverted Output(s), PQFP32, 7 X 7
ASM2I9942CG-32-LR	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942CG-32-LT	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942P	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip

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