External Capacitors Eliminated

External components are minimized. In the LVD mode, a fast buffer instead of regulators that require external capacitors supplies the common mode voltage. In SE mode, the nonlinear adaptive terminator eliminates external capacitors and more closely matches the loaded SCSI bus impedance. No external capacitors are required for references or regulators on the IMP multimode devices. Only a termpower bypass capacitor is required. 

In addition, other IC terminators require an external RC delay network to accommodate the100mS delay it takes between changes on the DIFFSENSE line and changes on their outputs. The IMP multimode parts include an internal digital counter that eliminates the external RC network. 

Master/Slave Operation

Driving the Master/Slave pin LOW disables the on-board DIFFSENS reference, allowing the use of an external master reference. If the Master/Slave pin is allowed to float or is driven HIGH, the internal DIFFSENSE reference is active. 

Automatic Mode Selection

Proper mode selection is automatic. If DIFFSENSE is below 0.5V single-ended operation is selected and if between 0.7V and 1.9V LVD operation is selected. Outputs are placed in a high-impedance state when DIFFSENSE is above 2.4V. 

A sleep or disable mode reduces supply current to 10 microamperes maximum and puts the DIFFSENSE and outputs in a high impedance state.