PDF ISL4489E Data sheet ( Hoja de datos )

Número de pieza	ISL4489E
Descripción	(ISL4489E / ISL4491E) RS-485/RS-422 Transceivers
Fabricantes	Intersil Corporation
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No Preview Available ! ® Data Sheet ISL4489E, ISL4491E April 28, 2006 FN6074.3 ±15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed and Slew Rate Limited, Full Duplex, RS-485/RS-422 Transceivers The ISL4489E, ISL4491E are ESD protected, “fractional” unit load, BiCMOS, 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Each driver output and receiver input is protected against ±15kV ESD strikes, without latch-up. Unlike competitive versions, these Intersil devices are specified for 10% tolerance supplies (4.5V to 5.5V). Rx inputs and Tx outputs present a “1/8 unit load” to the RS-485 bus, which allows a total of 256 transmitters and receivers on the network for large node count systems. These devices are configured for full duplex (separate Rx input and Tx output pins) applications, so they are ideal for RS-422 networks requiring high ESD tolerance on the bus pins. The ISL4489E utilizes a slew rate limited driver which reduces EMI, and minimizes reflections from improperly terminated transmission lines, or unterminated stubs in www.DataSheet4U.comm ultidrop and multipoint applications. Data rates up to 15Mbps are achievable by using the ISL4491E, which features higher slew rates. Receiver (Rx) inputs feature a “fail-safe if open” design, which ensures a logic high Rx output if Rx inputs are floating. Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage. Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive. Features • Pb-free Available as an Option (RoHS Compliant) (See Ordering Info) • RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM - Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM • 1/8 Unit Load Allows up to 256 Devices on the Bus • High Data Rates (ISL4491E) . . . . . . . . . . . up to 15Mbps • Slew Rate Limited Version for Error Free Data Transmission (ISL4489E) • Very Low Quiescent Current: - 140μA (ISL4489E) - 370μA (ISL4491E) • -7V to +12V Common Mode Input Voltage Range • Three-State Rx and Tx Outputs • Full Duplex Pinout • Operates from a Single +5V Supply (10% Tolerance) • Current Limiting and Thermal Shutdown for driver Overload Protection Applications • Factory Automation • Security Networks • Building Environmental Control Systems • Industrial/Process Control Networks • Level Translators (e.g., RS-232 to RS-422) • RS-232 “Extension Cords” PART HALF/FULL NUMBER DUPLEX ISL4489E Full ISL4491E Full HIGH ESD? Yes Yes TABLE 1. SUMMARY OF FEATURES NO. OF DEVICES DATA RATE SLEW-RATE RECEIVER/ QUIESCENT PIN ALLOWED ON BUS (Mbps) LIMITED? DRIVER ENABLE? ICC (μA) COUNT 256 0.25 Yes Yes 140 14 256 15 No Yes 370 14 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 \| Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004, 2006. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. 1 page ISL4489E, ISL4491E Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25°C, Note 2 (Continued) PARAMETER SYMBOL TEST CONDITIONS TEMP (°C) MIN TYP MAX UNITS SWITCHING CHARACTERISTICS (ISL4489E) Driver Input to Output Delay tPLH, tPHL RDIFF = 54Ω, CL = 100pF (Figure 2) Driver Output Skew tSKEW RDIFF = 54Ω, CL = 100pF (Figure 2) Driver Differential Rise or Fall Time tR, tF RDIFF = 54Ω, CL = 100pF (Figure 2) Driver Enable to Output High tZH CL = 100pF, SW = GND (Figure 3) Driver Enable to Output Low tZL CL = 100pF, SW = VCC (Figure 3) Driver Disable from Output High tHZ CL = 15pF, SW = GND (Figure 3) Driver Disable from Output Low tLZ CL = 15pF, SW = VCC (Figure 3) Receiver Input to Output Delay tPLH, tPHL Figure 4 Receiver Skew \| tPLH - tPHL \| tSKD Figure 4 Receiver Enable to Output High tZH CL = 15pF, SW = GND (Figure 5) Receiver Enable to Output Low tZL CL = 15pF, SW = VCC (Figure 5) Receiver Disable from Output High tHZ CL = 15pF, SW = GND (Figure 5) Receiver Disable from Output Low tLZ CL = 15pF, SW = VCC (Figure 5) Maximum Data Rate fMAX SWITCHING CHARACTERISTICS (ISL4491E) Full 250 400 2000 ns Full - 160 800 ns Full 250 600 2000 ns Full 250 1000 2000 ns Full 250 860 2000 ns Full 300 660 3000 ns Full 300 640 3000 ns Full 250 500 2000 ns 25 - 60 - ns Full - 10 50 ns Full - 10 50 ns Full - 10 50 ns Full - 10 50 ns Full 250 - - kbps Driver Input to Output Delay tPLH, tPHL RDIFF = 54Ω, CL = 100pF (Figure 2) Driver Output Skew tSKEW RDIFF = 54Ω, CL = 100pF (Figure 2) Driver Differential Rise or Fall Time tR, tF RDIFF = 54Ω, CL = 100pF (Figure 2) Driver Enable to Output High tZH CL = 100pF, SW = GND (Figure 3) Driver Enable to Output Low tZL CL = 100pF, SW = VCC (Figure 3) Driver Disable from Output High tHZ CL = 15pF, SW = GND (Figure 3) Driver Disable from Output Low tLZ CL = 15pF, SW = VCC (Figure 3) Receiver Input to Output Delay tPLH, tPHL (Figure 4) Receiver Skew \| tPLH - tPHL \| tSKD (Figure 4) Receiver Enable to Output High tZH CL = 15pF, SW = GND (Figure 5) Receiver Enable to Output Low tZL CL = 15pF, SW = VCC (Figure 5) Receiver Disable from Output High tHZ CL = 15pF, SW = GND (Figure 5) Receiver Disable from Output Low tLZ CL = 15pF, SW = VCC (Figure 5) Maximum Data Rate fMAX ESD PERFORMANCE RS-485 Pins (A, B, Y, Z) Human Body Model Full 13 Full - Full 5 Full - Full - Full - Full - Full 30 25 - Full - Full - Full - Full - Full 15 24 40 ns 3 10 ns 12 20 ns 14 70 ns 14 70 ns 44 70 ns 21 70 ns 90 150 ns 5 - ns 9 50 ns 9 50 ns 9 50 ns 9 50 ns - - Mbps 25 - ±15 - kV All Other Pins 25 - >±7 - kV NOTES: 2. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. 3. Supply current specification is valid for loaded drivers when DE = 0V. 4. Applies to peak current. See “Typical Performance Curves” for more information. 5. Devices meeting these limits are denoted as “1/8 unit load (1/8 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus, so there can be 256 1/8 UL devices on a bus. 5 FN6074.3 5 Page ISL4489E, ISL4491E Typical Performance Curves VCC = 5V, TA = 25°C; Unless Otherwise Specified (Continued) DI 5 RO 0 RDIFF = 54Ω, CL = 100pF 5 0 DI 5 RO 0 RDIFF = 54Ω, CL = 100pF 5 0 4 Z 3 2Y 1 0 TIME (20ns/DIV) FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL4491E) 4 Y 3 2Z 1 0 TIME (20ns/DIV) FIGURE 17. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL4491E) Die Characteristics SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 518 PROCESS: Si Gate BiCMOS 11 FN6074.3 11 Page

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