DATASHEET ISL4489E, ISL4491E FN6074 Rev.4.00 15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed and Slew Rate Sep 17, 2018 Limited, Full Duplex, RS-485/RS-422 Transceivers The ISL4489E and ISL4491E are ESD protected, fractional Features Unit Load (UL), BiCMOS, 5V powered, single transceivers Pb-free (RoHS compliant) that meet both the RS-485 and RS-422 standards for RS-485 I/O pin ESD protection . 15kV HBM balanced communication. Each driver output and receiver - Class 3 ESD level on all other pins . >7kV HBM input is protected against 15kV ESD strikes without latch-up. Unlike competitive versions, these devices are 1/8 unit load allows up to 256 devices on the bus specified for 10% tolerance supplies (4.5V to 5.5V). High data rates (ISL4491E) up to 15Mbps The Rx inputs and Tx outputs present a 1/8 unit load to the Slew rate limited version for error free data transmission RS-485 bus, which allows a total of 256 transmitters and (ISL4489E) receivers on the network for large node count systems. Very low quiescent current: These devices are configured for full duplex (separate Rx - 140A (ISL4489E) input and Tx output pins) applications, so they are ideal for - 370A (ISL4491E) RS-422 networks requiring high ESD tolerance on the bus pins. -7V to +12V common-mode input voltage range Tri-statable Rx and Tx outputs The ISL4489E uses a slew rate limited driver that reduces EMI and minimizes reflections from improperly terminated Full duplex pinout transmission lines, or unterminated stubs in multidrop and Operates from a single +5V supply (10% tolerance) multipoint applications. Current limiting and thermal shutdown for driver overload Data rates up to 15Mbps are achievable using the protection ISL4491E, which features higher slew rates. Applications The receiver (Rx) inputs feature a fail-safe if open design, which ensures a logic high Rx output if Rx inputs are floating. Factory automation The driver (Tx) outputs are short-circuit protected, even for Security networks voltages exceeding the power supply voltage. Additionally, Building environmental control systems on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive. Industrial/process control networks Level translators (for example, RS-232 to RS-422) Related Literature RS-232 extension cords For a full list of related documents, visit our website: ISL4489E, ISL4491E product pages TABLE 1. SUMMARY OF FEATURES PART HALF/FULL NO. OF DEVICES DATA RATE SLEW-RATE RECEIVER/ QUIESCENT PIN NUMBER DUPLEX HIGH ESD ALLOWED ON BUS (Mbps) LIMITED DRIVER ENABLE I (A) COUNT CC ISL4489E Full Yes 256 0.25 Yes Yes 140 14 ISL4491E Full Yes 256 15 No Yes 370 14 FN6074 Rev.4.00 Page 1 of 14 Sep 17, 2018ISL4489E, ISL4491E Ordering Information PART NUMBER TEMP. RANGE TAPE AND REEL PACKAGE PKG. (Notes 2, 3) PART MARKING (C) (UNITS) (Note 1) (RoHS Compliant) DWG. ISL4489EIBZ 4489EIBZ -40 to +85 - 14 Ld SOIC M14.15 ISL4489EIBZ-T 4489EIBZ -40 to +85 2.5k 14 Ld SOIC M14.15 ISL4491EIBZ 4491EIBZ -40 to +85 - 14 Ld SOIC M14.15 ISL4491EIBZ-T 4491EIBZ -40 to +85 2.5k 14 Ld SOIC M14.15 NOTES: 1. Refer to TB347 for details about reel specifications. 2. Pb-free plus anneal products employ special Pb-free material sets molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), see the ISL4489E and ISL4491E product information pages. For more information on MSL, see TB363. Pinout 14 LD SOIC TOP VIEW NC 1 14 V CC RO 2 13 NC R RE 3 12 A DE 4 11 B D DI 5 10 Z GND 6 9 Y GND 7 8 NC Pin Descriptions PIN FUNCTION RO Receiver output.RO is high if A > B by at least 0.2V RO is low if A < B by 0.2V or more RO = High if A and B are unconnected (floating). RE Receiver output enable. RO is enabled when RE is low RO is high impedance when RE is high. DE Driver output enable. The driver outputs Y and Z are enabled by bringing DE high. They are high impedance when DE is low. DI Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low. GND Ground connection. A 15kV HBM ESD protected, noninverting receiver input. B 15kV HBM ESD protected, inverting receiver input. Y 15kV HBM ESD protected, noninverting driver output. Z 15kV HBM ESD protected, inverting driver output. V System power supply input (4.5V to 5.5V). CC NC No connection. FN6074 Rev.4.00 Page 2 of 14 Sep 17, 2018