The SP3490and the SP3491are +3.3V low power full duplex transceivers that meet thespecifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pincompatible with the SipexSP490 and SP491 devices as well as popular industry standards.The SP3490and the SP3491feature Sipex'sBiCMOS process, allowing low power operationwithout sacrificing performance. The SP3490and SP3491meet the electrical specificationsof RS-485 and RS-422 serial protocols up to 10Mbps under load. The SP3491is identical tothe SP3490 with the addition of driver and receiver tri-state enable lines. devices are over ±15kV for both Human Body Model and IEC1000-4-2 Air dischargetest methods. The SP3222EB device has a low-power shutdown mode where the devices'driver outputs and charge pumps are disabled. During shutdown, the supply current falls toless than 1μA.