Datasheet > 逻辑 > 时钟驱动器> ASM2I9940LG-32-ET

ASM2I9940LG-32-ET

更新时间： 2024-11-26 22:07:47

品牌	Logo	应用领域
ALSC		时钟驱动器逻辑集成电路
页数	文件大小	规格书
13页	224K
描述
Low Voltage 1:18 Clock Distribution Chip

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June 2005

rev 1.0

ASM2I9940L

Low Voltage 1:18 Clock Distribution Chip

Features

With low output impedance (≈20Ω), in both the HIGH and

LOW logic states, the output buffers of the ASM2I9940L

are ideal for driving series terminated transmission lines.

With a 20Ω output impedance the ASM2I9940L has the

capability of driving two series terminated lines from each

output. This gives the device an effective fanout of 1:36.

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:

The differential LVPECL inputs of the ASM2I9940L 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 ASM2I9940L

have internal pullup/pulldown resistor, so they can be left

open if unused.

Dual V_CCSupply Voltage, 3.3V Core and

2.5V Output

Single 3.3V V_CCSupply Voltage for 3.3V

Outputs

Single 2.5V V_CCSupply Voltage for 2.5V I/O

Pin and Function compatible to MPC940L,

MPC9109, CY29940 and CY29940-1

Functional Description

The ASM2I9940L 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 7x7mm²body size with conservative 0.8mm pin

spacing.

The ASM2I9940L 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 ASM2I9940L 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

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...13

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与ASM2I9940LG-32-ET相关器件

型号	品牌	获取价格	描述	数据表
ASM2I9940LG-32-LR	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9940LG-32-LR	PULSECORE	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9940LG-32LT	ONSEMI	获取价格	Low Voltage 1:18 Clock Distribution Chip, 32 LEAD LQFP 7x7, 0.8P, 250-JTRAY
ASM2I9940LG-32-LT	PULSECORE	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9940LG-32-LT	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
ASM2I9942C	ALSC	获取价格	Low Voltage 1:18 Clock Distribution Chip
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

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