Datasheet > IMP5218

IMP5218

更新时间： 2024-02-18 15:51:52

品牌	Logo	应用领域
IMP		/
页数	文件大小	规格书
10页	294K
描述
9--Liine Pllug and Pllay SCSII Termiinattor

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技术参数
数据手册

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IMP5218 技术参数

生命周期：	Obsolete	零件包装代码：	TSSOP
包装说明：	PLASTIC, TSSOP-20	针数：	20
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.84
Is Samacsys：	N	差分输出：	NO
接口集成电路类型：	SCSI BUS TERMINATOR	JESD-30 代码：	R-PDSO-G20
功能数量：	1	信号线数量：	9
端子数量：	20	最高工作温度：	125 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装等效代码：	TSSOP20,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
电源：	3.5/5.5 V	认证状态：	Not Qualified
子类别：	Bus Terminators	最大压摆率：	225 mA
最大供电电压：	5.5 V	最小供电电压：	3.5 V
标称供电电压：	4.75 V	表面贴装：	YES
技术：	BICMOS	温度等级：	OTHER
端子形式：	GULL WING	端子节距：	0.635 mm
端子位置：	DUAL	Base Number Matches：	1

IMP5218 数据手册

IMP5111/5112

IMP5218

Application Information

Figure 1. Receiving Waveform – 20MHz

Figure 2. Driving Waveform – 20MHz

Receiver

Driver

1 Meter, AWG 28

IMP5218

5218_03.eps

Figure 3.

device the Disconnect 1 and Disconnect 2 pins must be driven per

Table 1. 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.

IMP5218 Maximizes Line Current

Cable transmission theory suggests to optimize signal speed and

quality, the termination should act both as an ideal voltage refer-

ence when the line is released (deasserted) and as an ideal

current source when the line is active (asserted). Common active

terminators which consist of linear regulators in series with resis-

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

terminators as the line voltage increases the amount of current

decreases linearly by the equation;

Disable/ Sleep Mode

Disable/ Sleep mode can be used for power conservation or to

remove the terminator from the SCSI chain.

The IMP5218 is disabled when both disconnect pins are driven

logic LOW.

_REF− V

(

)

= I.

LINE

Disable mode places the device in a sleep state, where quiescent

current is typically 375µA. When disabled, all outputs are in a

high impedance state and each output has only 3pF of capaci-

tance.

The IMP5218, 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.

An additional feature of the IMP5218 is its compatibility with

active negation drivers.

Acting as a near ideal line terminator, the IMP5218 closely repro-

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

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