Overview: IMP51 1 1/51 1 2 IMP52 8
DATA MUNICATIONS 9-Line Plug and Play SCSI Terminator
The 9-channel IMP5218 SCSI terminator is part of IMP's family of highperformance 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 terminator 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 pensation capacitor and the need for transient output capacitors while maintaining pin patibility with first generation designs. Reduced ponent 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 munications even in systems which do not adhere to remended 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 375µA, and the outputs are in a high impedance state.
