PDF ISL8483E Data sheet ( Hoja de datos )

Número de pieza	ISL8483E
Descripción	ESD Protected to 15kV/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers
Fabricantes	Intersil Corporation
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No Preview Available ! ® Data Sheet ISL8483E, ISL8485E December 2003 FN6048.3 ESD Protected to ±15kV, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers These Intersil RS-485/RS-422 devices are ESD protected, BiCMOS 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Each driver output/receiver input is protected against ±15kV ESD strikes, without latch-up. Unlike competitive devices, this Intersil family is specified for 10% tolerance supplies (4.5V to 5.5V). The ISL8483E utilizes slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. Data rates up to 5Mbps are achievable by using the ISL8485E which features higher slew rates. Both devices present a “single unit load” to the RS-485 bus, which allows up to 32 transceivers on the network. 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. These half duplex configurations multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 lead packages. Features • RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM - Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM • Specified for 10% Tolerance Supplies • High Data Rate Version (ISL8485E) . . . . . . up to 5Mbps • Slew Rate Limited Version for Error Free Data Transmission (ISL8483E) . . . . . . . . . . . . . .up to 250kbps • Single Unit Load Allows up to 32 Devices on the Bus • 1nA Low Current Shutdown Mode (ISL8483E) • Low Quiescent Current: - 160µA (ISL8483E) - 340µA (ISL8485E) • -7V to +12V Common Mode Input Voltage Range • Three State Rx and Tx Outputs • 30ns Propagation Delays, 5ns Skew (ISL8485E) • Operate 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” TABLE 1. SUMMARY OF FEATURES PART HALF/FULL NO. OF DEVICES DATA RATE SLEW-RATE RECEIVER/DRIVER QUIESCENT LOW POWER PIN NUMBER DUPLEX ALLOWED ON BUS (Mbps) LIMITED? ENABLE? ICC (µA) SHUTDOWN? COUNT ISL8483E Half 32 0.25 Yes Yes 160 Yes 8 ISL8485E Half 32 5 No Yes 340 No 8 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. 2003. All R ights Reserved. All other trademarks mentioned are the property of their respective owners. 1 page ISL8483E, ISL8485E Electrical Specifications Test Conditions: VCC Typicals are at VCC = = 4.5V 5V, TA to = 5.5V; Unless Otherwise Specified. 25oC, (Note 2) (Continued) PARAMETER SYMBOL TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS No-Load Supply Current, (Note 3) ICC ISL8485E, DI, RE = 0V DE = VCC or VCC DE = 0V Full - Full - 550 900 µA 340 500 µA ISL8483E, DI, RE = 0V DE = VCC or VCC DE = 0V Full - Full - 390 650 µA 160 250 µA Shutdown Supply Current ISHDN ISL8483E, DE = 0V, RE = VCC, DI = 0V or VCC Full - Driver Short-Circuit Current, VO = High or Low IOSD1 DE = VCC, -7V ≤ VY or VZ ≤ 12V, (Note 4) Full 35 Receiver Short-Circuit Current IOSR 0V ≤ VO ≤ VCC Full 7 SWITCHING CHARACTERISTICS (ISL8485E) 1 50 nA - 250 mA - 85 mA 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 (ISL8483E) Full 18 Full - Full 3 Full - Full - Full - Full - Full 30 25 - Full - Full - Full - Full - Full 5 30 50 ns 2 10 ns 11 25 ns 17 70 ns 14 70 ns 19 70 ns 13 70 ns 40 150 ns 5 - ns 9 50 ns 9 50 ns 9 50 ns 9 50 ns - - Mbps Driver Input to Output Delay tPLH, tPHL RDIFF = 54Ω, CL = 100pF, (Figure 2) Full 250 800 2000 ns Driver Output Skew tSKEW RDIFF = 54Ω, CL = 100pF, (Figure 2) Full - 160 800 ns Driver Differential Rise or Fall Time tR, tF RDIFF = 54Ω, CL = 100pF, (Figure 2) Full 250 800 2000 ns Driver Enable to Output High tZH CL = 100pF, SW = GND, (Figure 3), (Note 5) Full 250 - 2000 ns Driver Enable to Output Low tZL CL = 100pF, SW = VCC, (Figure 3), (Note 5) Full 250 - 2000 ns Driver Disable from Output High tHZ CL = 15pF, SW = GND, (Figure 3) Full 300 - 3000 ns Driver Disable from Output Low tLZ CL = 15pF, SW = VCC, (Figure 3) Full 300 - 3000 ns Receiver Input to Output Delay tPLH, tPHL (Figure 4) Full 250 350 2000 ns Receiver Skew \| tPLH - tPHL \| tSKD (Figure 4) 25 - 25 - ns Receiver Enable to Output High tZH CL = 15pF, SW = GND, (Figure 5), (Note 6) Full - 10 50 ns Receiver Enable to Output Low tZL CL = 15pF, SW = VCC, (Figure 5), (Note 6) Full - 10 50 ns Receiver Disable from Output High tHZ CL = 15pF, SW = GND, (Figure 5) Full - 10 50 ns Receiver Disable from Output Low tLZ CL = 15pF, SW = VCC, (Figure 5) Full - 10 50 ns Maximum Data Rate fMAX Full 250 - - kbps Time to Shutdown tSHDN (Note 7) Full 50 200 600 ns Driver Enable from Shutdown to Output High tZH(SHDN) CL = 100pF, SW = GND, (Figure 3), (Notes 7, 8) Full - - 2000 ns 5 5 Page ISL8483E, ISL8485E Typical Performance Curves VCC = 5V, TA = 25oC, ISL8483E and ISL8485E; Unless Otherwise Specified (Continued) 40 3 35 30 tPHLZ 25 tPHLY tPLHY tPLHZ 20 -40 -25 0 25 50 TEMPERATURE (oC) FIGURE 12. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL8485E) 75 85 2.5 \|tPHLY - tPLHZ\| 2 \|tPLHY - tPHLZ\| 1.5 \|CROSSING PT. OF Y↑ & Z↓ - CROSSING PT. OF Y↓ & Z↑\| 1 -40 -25 0 25 50 75 85 TEMPERATURE (oC) FIGURE 13. DRIVER SKEW vs TEMPERATURE (ISL8485E) DI 5 RO 0 RDIFF = 54Ω, CL = 100pF 5 0 4 B/Z 3 2 A/Y 1 0 TIME (400ns / DIV) FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL8483E) DI 5 RO 0 RDIFF = 54Ω, CL = 100pF 5 0 4 B/Z 3 2 A/Y 1 0 TIME (10ns / DIV) FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL8485E) 11 DI 5 RO 0 RDIFF = 54Ω, CL = 100pF 5 0 4 3 A/Y 2 B/Z 1 0 TIME (400ns / DIV) FIGURE 15. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL8483E) DI 5 RO 0 RDIFF = 54Ω, CL = 100pF 5 0 4 3 A/Y 2 B/Z 1 0 TIME (10ns / DIV) FIGURE 17. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL8485E) 11 Page

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