IMP5226

TermPwr Voltage ..................................+7V
Signal Line Voltage..............................0V to +7V
Regulator Output Current .............................1.2A
Operating Junction Temperature
Plastic (DB, DWP Packages)  .......................... 150°C
Storage Temperature Range..................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds)...................300°C

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal.

The IMP5226 SCSI terminator is part of IMP's family of high-performance, adaptive, non-linear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low-voltage BiCMOS architecture employed in IMP5226 design offers performance superior to older linear passive and active techniques. IMP's 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/terminator approach used by other manufacturers. Products using this older linear regulator of IMP5226 approach have bandwidths which are dominated by the output capacitor and which are limited to 500KHz (see further discussion in the Functional Description section). The IMP architecture also eliminates the output compensation capacitor required in earlier terminator designs. Each is approved for use with SCSI-1, -2, -3, UltraSCSI and beyond - providing the highest performance alternative available today.

The IMP5226 architecture is much more tolerant of marginal system integrations. A key improvement offered by the IMP5226 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 the use of improper cable lengths and impedances. Frequently, this situation is not controlled by the peripheral or host designer and, when problems occur, they are the first to be made aware of the problem.

To enter the disconnect mode, the disconnect pin must be driven high, thereby disconnecting the IMP5226 from the SCSI bus. Quiescent current is typically less than 200mA in this mode, while the output capacitance is less than 3pF.

Reduced component count is also inherent in the IMP5226 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20mF in value and size. The IMP5226 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs.

The IMP5226 is a superior pin-for-pin replacement for the LX5207, the UC5601/ 5602/5608/5610/5618 and the Burr Brown REG5608/5618.