IMP5218 IMP, IMP5218 Datasheet

IMP5218

Manufacturer Part Number

IMP5218

Description

Pllug and Pllay SCSII Termiinattor

Manufacturer

IMP

Datasheet

1.IMP5218.pdf (10 pages)

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9-Line Plug and Pla

SCSI T

The 9-channel IMP5218 SCSI terminator is part of IMP's family of high-

performance SCSI terminators that deliver true UltraSCSI performance.

The BiCMOS design offers superior performance over first generation

linear regulator/resistor based terminators.

The IMP5218 has two disconnect pins for SCSI Plug and Play (PnP)

applications.

IMP's new architecture employs high-speed adaptive elements for each

channel, thereby providing the fastest response possible - typically

35MHz, which is 100 times faster than the older linear regulator termi-

nator approach. The bandwidth of terminators based on the older

regulator/resistor terminator architecture is limited to 500kHz since a

large output stabilization capacitor is required. The IMP architecture

eliminates the external output compensation capacitor and the need

for transient output capacitors while maintaining pin compatibility

with first generation designs. Reduced component count is inherent

with the IMP5218.

The IMP5218 architecture tolerates marginal system designs. A key

improvement offered by the IMP5218 lies in its ability to insure reliable,

error-free communications even in systems which do not adhere to rec-

ommended SCSI hardware design guidelines, such as improper cable

lengths and impedance. Frequently, this situation is not controlled by the

peripheral or host designer.

For portable and configurable peripherals, the IMP5218 can be placed in

a sleep mode with two disconnect signals. When disabled, the quiescent

current is typically 375 A, and the outputs are in a high impedance state.

Daily Silver IMP

9-Line Plug and Pla

SCSI T

Block Diagrams

DISCONNECT 1

DISCONNECT 2

Term Power

minat

Thermal

Limiting

Circuit

Current

Biasing

Circuit

IMP5

Limiting Circuit

24mA Current

SCSI plug and play

— Dual disconnect pins

— Logic LOW disconnects lines

Hot swap compatible

Ultra-Fast response for Fast-20 SCSI applications

35MHz channel bandwidth

3.5V operation

Less than 3pF output capacitance

375µA disable-mode current

Thermally self limiting

No external compensation capacitors

Implements 8-bit or 16-bit (wide) applications

Compatible with active negation drivers

(60mA/channel)

Compatible with passive and active terminations

Approved for use with SCSI 1, 2, 3 and UltraSCSI

2.85V

Data Communications

1 of 9 Channels

IMP52

1/5

DATA OUTPUT

PIN DB (0)

Key Features

5218_01.eps

Related parts for IMP5218

IMP5218 Summary of contents

Page 1

... Reduced component count is inherent with the IMP5218. The IMP5218 architecture tolerates marginal system designs. A key improvement offered by the IMP5218 lies in its ability to insure reliable, error-free communications even in systems which do not adhere to rec- ommended SCSI hardware design guidelines, such as improper cable lengths and impedance ...

Page 2

... D JA www.ds-imp.com.cn IMP5 1 1 1/5 IMP52 IMP5 1 1 1/5 IMP52 TSSOP-20 TERM POWER 1 20 TERM POWER DISCONNECT DISCONNECT IMP5218 GND 10 11 GND PW Package ...

Page 3

... Daily Silver IMP ...

Page 4

... 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. Acting as a near ideal line terminator, the IMP5218 closely repro- duces the optimum case when the device is enabled. To enable the 4 ...

Page 5

... Typical Characteristics Figure 5. Driving Waveform 3.5 Frequency = 1.00266MHz 3.0 2.5 2.0 1.5 1.0 0.5 GND –0.5 Time (250ns/Div.) Driver Figure 5 IMP5218 5218_06.eps Data Communications 5218_05 ...

Page 6

... Figure 12. End-Driven Cable www.ds-imp.com. 1/5 1 IMP52 1 1 1/5 1 IMP52 Figure 8. Driving Waveform 3.5 Frequency = 4.9961MHz 3.0 2.5 2.0 1.5 1.0 0.5 Time (50ns/Div.) Figure 8 IMP5218 5218_09.eps Figure 11. 20MHz Waveform 4 Ch2 Frequency = 20.020MHz Time (10ns/Div.) 5218_11.eps 4.75V IMP5218 5218_12.eps 5218_08.eps Daily Silver IMP ...

Page 7

... Junction Temperature ( C) Figure 15. Output Current vs. Output High Voltage 0.4 0.8 1.2 Output High Voltage (V) Figure 17. TermPwr Supply Current vs. Termination Voltage 2.5 3.0 3.5 Termination Voltage (V) Daily Silver IMP 75 100 125 5218_13.eps V = 4.75V 1.6 2.0 2.4 2.8 3.2 5218_15.eps 4.0 4.5 5.0 5.5 6.0 5218_17.eps IMP5 1 1 1/5 IMP52 IMP5 ...

Page 8

... Figure 22. Output Current vs. Termination Voltage 4.5 5.0 5.5 6.0 Voltage (V) 5218_21.eps www.ds-imp.com. 1/5 IMP52 IMP5 1 1 1/5 IMP52 3. Junction Temperature ( 3.0 3.5 4.0 4.5 5.0 V Voltage (V) TERM 100 125 5218_20.eps 5.5 6.0 5218_22.eps Daily Silver IMP ...

Page 9

... TERM POWER 5V V TERM 2.2 F DISC1 IMP5218 DISC2 TERMPWR TERMPWR V TERM DISC1 IMP5218 DISC2 Note: Add third IMP5218 for 16-bit SCSI Daily Silver IMP IMP5 IMP5 Part # Figure 23. Output Current Matching Channel to Channel HOST ...

Page 10

... Keda Road , Hi-Tech Park, NingBo,Zhejiang, P.R.C. Post Code : 315040 Tel:(086)-574-87906358 Fax:(086)-574-87908866 e-mail:sales@ds-imp.com.cn http://www.ds-imp.com.cn The IMP logo is a registered trademark of Daily Silver IMP. All other company and product names are trademarks of their respective owners ...

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