The UCC5610 provides 18 lines of active termination for a SCSI parallel bus. It is ideal for high performance 3.3V SCSI systems. The key features contributing to such low operating voltage are the 0.1V drop out regulator and the 2.75V reference. During disconnect, the supply current is typically only 0.5µA, making it attractive for battery powered systems. The UCC5610 has an ultra low channel capacitance of 1.8pF, eliminating effects on signal integrity from disconnected terminators at interim points on the bus. It can be programmed for either a 110 ohm or 2.5k ohm termination. The 110 ohm termination is used for standard SCSI bus lengths, while the 2.5k ohm termination is typically used in short bus applications. When driving the DISCNCT pin directly, the 110 ohm termination is connected when the pin is driven low, and disconnected when driven high. When driven through an impedance between 80k and 150k, the 2.5k ohm termination is connected when the pin is driven low, and disconnected when driven high.
The UCC5610 provides 18 lines of active termination for SCSI parallel buses, complying with SCSI‑2/3 and FAST‑20 standards. It features ultra‑low channel capacitance (1.8 pF), programmable termination impedance (110 Ω or 2.5 kΩ), and a 0.5 µA supply current in disconnect mode, making it suitable for high‑performance and battery‑powered systems.
Electrical specifications include a drop‑out voltage of 0.1‑0.2 V, thermal shutdown at 170 °C, and operating temperature range from –55 °C to +150 °C. The device is offered in SOIC‑28, DIP‑24, and PLCC‑28 packages and includes built‑in current limiting and thermal protection.
| Supply Current in Disconnect Mode | 0.5 µA |
|---|---|
| Programmable Termination Impedance | 110 Ω or 2.5 kΩ |
| Operating Temperature Range | -55 °C to +150 °C |
| Drop‑Out Voltage | 0.1 V – 0.2 V |
The UCC5610 draws only 0.5 µA supply current in disconnect mode.
The device can be programmed for either 110 Ω or 2.5 kΩ termination impedance.
It operates from –55 °C up to +150 °C.