These devices are BiCMOS interface ICs that are user configured as either a single RS-422, RS-485 differential transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver.
In RS-232 mode, the on-board charge pump generates RS-232 compliant ±5V Tx output levels, from a supply as low as 4.5V. Four small 0.1µF capacitors are required for the charge pump. The transceivers are RS-232 compliant, with the Rx inputs handling up to ±25V, and the Tx outputs handling ±12V.
In RS-485 mode, the transceivers support both the RS-485 and RS-422 differential communication standards. The RS-485 receiver features "full fail-safe" operation, so the Rx output remains in a high state if the inputs are open or shorted together. The RS-485 transmitter supports up to three data rates, two of which are slew rate limited for problem free communications. The charge pump disables in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors.
Both RS-232, RS-485 modes feature loopback and shutdown functions. The loopback mode internally connects the Tx outputs to the corresponding Rx input, which facilitates the implementation of board level self test functions. The outputs remain connected to the loads during loopback, so connection problems (e.g., shorted connectors or cables) can be detected. The shutdown mode disables the Tx and Rx outputs, disables the charge pump if in RS-232 mode, and places the IC in a low current (35µA) mode.
The ISL41387 is a QFN packaged device that offers additional functionality, including a lower speed and edge rate option (115kbps) for EMI sensitive designs, or to allow longer bus lengths. It also features a logic supply voltage pin (VL) that sets the VOH level of logic outputs, and the switching points of logic inputs, to be compatible with another supply voltage in mixed voltage systems. The QFN's choice of active high or low Rx enable pins increases design flexibility,
IC TRANSCEIVER HALF 2/2 20SSOP
RS-422/RS-485 Interface IC W/ANNEAL SINGLE 5V MULTIPROTOCOL TRANSC
RS232,RS485 TRANSCEIVER, 5.5V, SSOP-20; Device Type:RS232 / RS485 Transceiver; IC Interface Type:RS232, RS485; No. of Drivers:2Drivers; No. of Receivers:2Receivers
IC TRANSCEIVER HALF 2/2 20SSOP
| Renesas Electronics Corporation | ODG (Origin Data Global) | VAST STOCK CO., LIMITED | Newark, An Avnet Company | Shenzhen Shengyu Electronics Technology Limited | |
|---|---|---|---|---|---|
| Product Category | IC Interfaces | IC Interfaces | IC Interfaces | IC Interfaces | IC Interfaces |
| Product Number | ISL81387IAZ | ISL81387IAZ | ISL81387IAZ | 80K5937 | ISL81387IAZ |
| Product Name | ±15kV ESD Protected, 5V, Dual Protocol (RS-232/RS-485) Transceivers | Drivers, Receivers, Transceivers | RS-422/RS-485 Interface IC | Rs232,rs485 Transceiver, 5.5V, Ssop-20; Device Type Renesas | Integrated Circuits (ICs) - Interface - Drivers, Receivers, Transceivers |
| Technology | RS232; RS485 | RS232; RS422; RS485; RS232, RS422, RS485 | RS232; RS422; RS485; RS232, RS422, RS485 | ||
| Device Type | Transceiver | Transceiver; Transceiver | Receiver; Sensor Interface | ||
| Package Type | SOIC; SSOP | SSOP; 20-SSOP (0.209", 5.30mm Width) | SSOP-20 | SSOP | |
| Supply Voltage | Other; 4.5V ~ 5.5V | 5V | Other; 4.5V | Other | |
| Data Rate | 20000 kbps | 20000 to ? kbps |
