IMP5219

更新时间： 2024-01-26 20:20:40

品牌	Logo	应用领域
A1PROS		/
页数	文件大小	规格书
10页	299K
描述
9--Liine SCSII Termiinattor

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中文翻译

获取价格

技术参数
数据手册

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IMP5219 技术参数

生命周期：	Contact Manufacturer	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.68
Is Samacsys：	N	Base Number Matches：	1

IMP5219 数据手册

IMP51IM11P/55121129

Application Information

Figure 1. Receiving Waveform – 20MHz

Figure 2. Driving Waveform – 20MHz

Receiver

Driver

1 Meter, AWG 28

IMP5219

5219_03.eps

Figure 3.

IMP5219 Maximizes Line Current

Disable/ Sleep Mode

Cable transmission theory suggests to optimize signal speed and Disable mode places the device in a sleep state, where quiescent

quality, the termination should act both as an ideal voltage refer- current typically 375µA. When disabled, all outputs are in a high

ence when the line is released (deasserted) and as an ideal impedance state and output capacitance is a low 3pF. Sleep mode

current source when the line is active (asserted). Common active can be used for power conservation or to remove the terminator

terminators which consist of linear regulators in series with resis- from the SCSI chain.

tors (typically 110Ω) are a compromise. With coventional linear

An additional feature of the IMP5219 is its compatibility with

terminators as the line voltage increases the amount of current

active negation drivers.

decreases linearly by the equation;

Table 1. Power Up/ Power Down Function Table

_REF− V

(

)

= I.

LINE

Disable

Outputs

Quiescent Current

The IMP5219, with its unique new architecture, applies the maxi-

mum amount of current regardless of line voltage until the

termination high threshold (2.85V) is reached.

Enabled

6mA

Disable/High

Impedance

375µA

Acting as a near ideal line terminator, the IMP5219 closely repro-

duces the optimum case when the device is enabled. To enable the

device the Disable pin must be driven HIGH or left Open. When

enabled, quiescent current is 6mA and the device will respond to

line demands by delivering 24mA on assertion and by imposing

2.85V on de-assertion.

Open

Enabled

6mA

5219_t04.eps

408-432-9100/ www.impweb.com

1 2 345 6 7...10

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