ISL41334 Datasheet | Renesas

feature “full fail-safe” operation, so the Rx outputs remain in a high state if the inputs are open or shorted together. The transmitters support up to three data rates, two of which are slew rate limited for problem-free munications. The charge pump disables when both ports are in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors. Both RS-232 and RS-485 modes feature loopback and shutdown functions. Loopback internally connects the Tx outputs to the corresponding Rx input, to facilitate board level self-test implementation. The outputs remain connected to the loads during loopback, so connection problems (such as shorted connectors or cables) can be detected. Shutdown mode disables the Tx and Rx outputs, disables the charge pumps, and places the IC in a low current (µA) mode. The ISL41334 is a QFN packaged device that includes two additional user selectable, lower speed, and edge rate options for EMI-sensitive designs, or to allow longer bus lengths. It also features a logic supply pin (VL) that sets the VOH level of logic outputs, and the switching points of logic inputs, to be patible with another supply voltage in mixed voltage systems. The QFN also adds active low Rx enable pins to increase design flexibility, allowing Tx/Rx direction control, through a single signal per port, by connecting the corresponding DE and RXEN pins together. For a single port version of these devices, please see the ISL81387, ISL41387 datasheet. Features - ±15k V (HBM) ESD protected bus pins (RS-232 or RS-485) - Two independent ports, each user selectable for RS-232 (2 transceivers) or RS-485, RS-422 (1 transceiver) - Single 5V (10% tolerance) supply - Flow-through pinouts simplify board layouts - Pb-Free (Ro HS pliant) - Large (2.7V) differential VOUT for improved noise immunity in RS-485, RS-422 networks - Full fail-safe (open/short) Rx in RS-485, RS-422 mode - Loopback mode facilitates board self-test functions - User selectable RS-485...