Key Features

x

Ultra-Fast response for Fast-20 SCSI applications

x

35MHz channel bandwidth

x

3.3V operation

x

Less than 3pF output capacitance

x

Sleep-mode current less than 275µA

x

Thermally self limiting

x

No external compensation capacitors

x

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

x

Compatible with active negation drivers

(60mA/channel)

x

Compatible with passive and active terminations

x

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

x

Hot swap compatible

x

Pin-for-pin compatible with LX5211 and

UC5606 (IMP5111)

x

Pin-for-pin compatible with LX5212 and

UC5603/5613/5614 (IMP5112)

Block Diagrams

–

+

Current

Biasing

Circuit

Thermal

Limiting

Circuit

24mA Current

Limiting Circuit

Term Power

DATA OUTPUT

PIN DB (0)

1 of 9 Channels

DISCONNECT (IMP5111)

DISCONNECT (IMP5112)

1.4V

2.85V

5111/5112_01.eps

9-Line SCSI T

or

– 35MHz Channel Bandwidt

h

The 9-channel IMP5111/5112 SCSI terminator is part of IMP's family

of high-performance SCSI terminators that deliver true UltraSCSI per-

formance. The BiCMOS design offers superior performance over first

generation linear regulator/resistor based terminators.

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 IMP5111/5112.

The IMP5111/5112 architecture tolerates marginal system designs. A key

improvement offered by the IMP5111/5112 lies in its ability to insure

reliable, error-free communications even in systems which do not adhere

to recommended 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 IMP5111/5112 can be

placed in a sleep mode with a disconnect signal. Quiescent current is less

than 275

µA when disabled. When disabled, the outputs are in a high

impedance state with output capacitance less than 3pF.

© 2002 IMP, Inc.

408-432-9100/www.impweb.com

1

IMP5

© 2002 IMP, Inc.

408-432-9100/www.impweb.com

1

IMP5