Sun Enterprise 220R Server Service Manual

Electrical Characteristics

Drivers operate at a nominal 5-VDC transistor-transistor logic (TTL) levels. The maximum open circuit voltage is 5.5 VDC and the minimum is -0.5 VDC. A logic high-level signal is at least 2.4 VDC at a source current of 0.32 mA and a logic low-level signal is no more than 0.4 VDC at a sink current of 14 mA.

Receivers also operate at nominal 5-VDC TTL levels and can withstand peak voltage transients between -2 VDC and 7 VDC without damage or improper operation. The high-level threshold is less than or equal to 2.0 VDC and the low-level threshold is at least 0.8 VDC. Sink current is less than or equal to 0.32 mA at 2.0 VDC and source current is less than or equal to 12 mA at 0.8 VDC.