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SP5301 Datasheet(PDF) 5 Page - Sipex Corporation |
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SP5301 Datasheet(HTML) 5 Page - Sipex Corporation |
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5 / 13 page  5 SP5301DS/10 SP5301 Universal Serial Bus Transceiver © Copyright 2000 Sipex Corporation DESCRIPTION The SP5301 is a half-duplex Universal Serial Bus (USB) differential transceiver that interfaces with the VHDL Serial Interface Engine (SIE) from the USB developer's conference. The SP5301 is designed to allow digital logic to communicate with the physical layer of the Universal Bus. The USB is a cable bus that supports data exchange between a host computer and a wide range of peripherals. Attached peripherals share USB bandwidth through a host scheduled token based protocol. The USB allows peripherals to be attached, configured, used, and detached while the host and other peripherals are in operation. This is referred to as dynamic, or hot, attachment and removal. USB attributes include lower costs, hot plug-and-play with dynamic attach-detach capabilities, ease of design and use, multiple peripherals, guaranteed latency, and guaranteed bandwidth. The USB is specified to be an industry standard extension to the PC architecture with a focus on Computer Telephony Integration (CTI), consumer, and productivity applications. The architecture of the USB protocol can ease the expansion of PC peripherals, provide a low-cost solution that supports tranfer rates up to 12Mbps, and can fully support real-time data for voice, audio, and compressed video. The USB protocol can provide protocol flexibility for mixed-mode isochronous data transfers and asynchrounousmessaging.Guaranteedbandwidth and low latencies are appropriate for many telephony and audio applications. A 12Mbps bus covers the mid-speed and low-speed data ranges. Typically, mid-speed data types are isochronous and low-speed data comes from interactive devices. Isochronous communication can only be used by full speed devices. THEORY OF OPERATION The USB protocol can support multiple connections for up to 127 physical devices composed of many diverse functions. This makes the SP5301 an ideal solution for multidrop applications. This lower protocol overhead results in high bus utilization. An isochronous workload may utilize the entire USB bus bandwidth. The USB protocol reflects a robust capability of dynamic insertion and removal of devices identified in user perceived real-time. This PC plug and play quality preserves the marketable synergy with the PC industry, being a simple protocol to implement and integrate into existing operating systems. The SP5301 contains a differential driver and a differential receiver in a half-duplex configuration. The driver is enabled by the OE pin. If OE is asserted LOW, the driver is active and the D- and D+ pins drive USB signals. The differential receiver is also controlled by the OE pin. If OE is HIGH, while SUSPEND is LOW, the receiver is active and the driver is in tri-state. In this receive mode, the D- and D+ pins are now receiving USB signals. The typical driver output voltage swing for D- and D+ of the SP5301 will be less than +0.3V for the LOW state and greater than +2.8V for the HIGH state. The SP5301 is a USB differential interface with very high receiver input sensitivity. This makes data virtually immune to noise on the USB pipeline. The +90mV minimum receiver input sensitivity of the SP5301 ensures recovery of even severely attenuated signals. |
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