What are the characteristics of the D+/- transceiver?
The transceiver consists of three main functional blocks: – Differential receiver – Single-ended receiver with on-chip voltage reference – Transmitter with on-chip current source The USBN9603/4 transceiver meets the performance requirements of the USB Specification, Revision 1.1. – Chapter 7 To minimize signal skew, the differential output swings of the transmitter are well balanced. The output drivers support TRI-STATE(R) operation to allow bi-directional, half-duplex operation of the transceiver. A single-ended receiver is present on each of the two data lines. These two single-ended receivers are required, in addition to the differential receiver, to detect an absolute voltage with a switching threshold between 0.8V and 2.0V.
