The UC5601 is an active terminator that complies with the SCSI and SCSI-2 standards. It provides precise resistive pull-up to a 2.9V reference voltage for all 18 lines in a Small Computer Systems Interface (SCSI) bus cable. The device features a disconnect function that, upon a logic command, disconnects all terminating resistors and turns off the regulator, greatly reducing standby power. Other features include negative clamping on all signal lines, 20mA of active negation sink current capability, regulator current limiting, and thermal shutdown protection.
The UC5601 is a SCSI‑2 active terminator that supplies a precision resistive pull‑up to a 2.9 V reference for all 18 lines of a SCSI bus. It includes a logic‑controlled disconnect feature that turns off the regulator and removes the terminating resistors, reducing standby power. The device meets SCSI hot‑plugging requirements and offers negative clamping, current limiting, and thermal shutdown protection.
Electrical characteristics are provided for various operating conditions, including a typical termination impedance of 110 Ω, regulator output voltage of 2.9 V, and a supply voltage range of 4.0 V to 5.25 V. Thermal data for different package types are also listed, with a thermal shutdown threshold of 170 °C. Connection diagrams for PLCC‑28, SOIC‑28, and DIL‑24 packages illustrate pin assignments and grounding.
| Thermal Shutdown Temperature | 170 °C |
|---|---|
| Supply Current (all termination lines, open) | 7 mA min / 25 mA typ |
Yes, the device meets SCSI hot‑plugging specifications.