ML6599

February 1997 ML6599* Hot-Insertable Active SCSI Terminator GENERAL DESCRIPTION The ML6599 BiCMOS 9 line SCSI terminator provides active termination in SCSI systems using single ended drivers and receivers. Active SCSI termination helps to effectively control analog transmission line effects such as ringing, noise, crosstalk, and ground bounce. In addition, the ML6599 provides support for hot-insertability on the SCSI bus. The ML6599 provides a V-I characteristic optimized to minimize transmission line effects during both signal negation and assertion using a MOSFET-based architecture. The desired V-I characteristic is achieved by trimming one resistor in the control block. Internal clamping controls signal assertion transients and provides current sink capability to handle active negation driver overshoots above 2.85V. It provides a 2.85V reference through an internal low dropout (1V) linear regulator. The ML6599 also provides a disconnect function which effectively removes the terminator from the SCSI bus. The disconnect mode capacitance is typically less than 5pF per line. Current limiting and thermal shutdown protection are also included. FEATURES s s s s s s s s s Fully monolithic IC solution providing active termination for 9 lines of the SCSI bus Provides on board support for hot-insertability on the SCSI bus Low dropout voltage (1V) linear regulator, trimmed for accurate termination current Output capacitance typically < 5pF Disconnect mode — logic pin to disconnect terminator from the SCSI bus,