The document introduces the features and characteristics of the UC5603 chip, which is a chip that provides 9 lines of active termination for the SCSI bus. It supports hot plugging and has low channel capacitance and low standby power
The UC5603 active terminator supplies nine lines of active termination for SCSI parallel buses. It features a low channel capacitance of 6 pF, a disconnect mode that disables all terminating resistors and the regulator to reduce standby power, and built‑in current limit and thermal shutdown protection.
The device is offered in various SOIC‑16 packages (DP, DPTR, etc.) with detailed electrical specifications such as regulator output voltage 2.8‑3 V, disconnect threshold 1.3‑1.5 V, and a maximum output current of about 22‑25 mA per line. Mechanical drawings, packaging options, and ordering information are also provided.
| Number of termination lines | 9 |
|---|---|
| Channel capacitance | 6 pF (typical) |
| Disconnect feature | Disconnects all terminating resistors and disables regulator when opened or driven high |
| Supply current (power‑down mode) | 100‑150 µA |
| Thermal shutdown temperature | 170 °C |
The UC5603 provides nine lines of active termination for a SCSI parallel bus.
The device has a low channel capacitance of 6 pF (typical).
When the disconnect input is opened or driven high, all terminating resistors are disconnected and the regulator is disabled, greatly reducing standby power.
The device shuts down thermally at 170 °C.