ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 ® Data Sheet December 2003 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers FN6046.3 Features • Specified for 10% Tolerance Supplies The Intersil RS-485/RS-422 devices are BiCMOS 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this Intersil family is specified for 10% tolerance supplies (4.5V to 5.5V). • Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV • High Data Rates. . . . . . . . . . . . . . . . . . . . . . up to 5Mbps • Slew Rate Limited Versions for Error Free Data Transmission at 250kbps (ISL8483, ISL8488, ISL8489) The ISL8483, ISL8488, and ISL8489 utilize slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. • Single Unit Load Allows up to 32 Devices on the Bus • 1nA Low Current Shutdown Mode (ISL8483) • Low Quiescent Current: - 160µA (ISL8483, ISL8488, ISL8489) - 340µA (ISL8485, ISL8490, ISL8491) Data rates up to 5Mbps are achievable by using the ISL8485, ISL8490, or ISL8491, which feature higher slew rates. • -7V to +12V Common Mode Input Voltage Range All devices present a “single unit load” to the RS-485 bus, which allows up to 32 transceivers on the network. • Three State Rx and Tx Outputs (Except ISL8488, ISL8490) Receiver (Rx) inputs feature a “fail-safe if open” design, which ensures a logic high Rx output if Rx inputs are floating. • 30ns Propagation Delays, 5ns Skew (ISL8485, ISL8490, ISL8491) 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. • Operate from a Single +5V Supply (10% Tolerance) • Full Duplex and Half Duplex Pinouts • Current Limiting and Thermal Shutdown for driver Overload Protection Applications The ISL8488 - 91 are configured for full duplex (separate Rx input and Tx output pins) applications. The ISL8488 and ISL8490 are offered in space saving 8 lead packages for applications not requiring Rx and Tx output disable functions (e.g., point-to-point). Half duplex configurations (ISL8483, ISL8485) multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 lead packages. • 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 NUMBER HALF/FULL DUPLEX NO. OF DEVICES DATA RATE ALLOWED ON BUS (Mbps) SLEW-RATE RECEIVER/ QUIESCENT LIMITED? DRIVER ENABLE? ICC (µA) LOW POWER SHUTDOWN? PIN COUNT ISL8483 Half 32 0.25 Yes Yes 160 Yes 8 ISL8485 Half 32 5 No Yes 340 No 8 ISL8488 Full 32 0.25 Yes No 160 No 8 ISL8489 Full 32 0.25 Yes Yes 160 No 14 ISL8490 Full 32 5 No No 340 No 8 ISL8491 Full 32 5 No Yes 340 No 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. 2003. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Pinouts Ordering Information PART NO. (BRAND) TEMP. RANGE (oC) ISL8483IB (8483IB) -40 to 85 ISL8483IB-T (8483IB) -40 to 85 ISL8483IP PACKAGE 8 Ld SOIC PKG. DWG. # M8.15 ISL8483, ISL8485 (PDIP, SOIC) TOP VIEW RO 1 RE 2 8 Ld SOIC Tape and Reel M8.15 -40 to 85 8 Ld PDIP E8.3 ISL8485CB (8485CB) 0 to 70 8 Ld SOIC M8.15 ISL8485CB-T (8485CB) 0 to 70 8 Ld SOIC Tape and Reel M8.15 ISL8485CP 0 to 70 8 Ld PDIP E8.3 ISL8485IB (8485IB) -40 to 85 8 Ld SOIC M8.15 ISL8485IB-T (8485IB) -40 to 85 8 Ld SOIC Tape and Reel M8.15 ISL8485IP -40 to 85 8 Ld PDIP E8.3 ISL8488IB (8488IB) -40 to 85 8 Ld SOIC M8.15 ISL8488IB-T (8488IB) -40 to 85 ISL8488IP -40 to 85 DE 3 DI 4 D VCC 1 R RO 2 DI 3 GND 4 D M8.15 8 Ld PDIP E8.3 -40 to 85 14 Ld SOIC RO 2 14 Ld SOIC Tape and Reel M14.15 ISL8489IP -40 to 85 14 Ld PDIP E14.3 ISL8490IB (8490IB) -40 to 85 8 Ld SOIC M8.15 ISL8490IB-T (8490IB) -40 to 85 8 Ld SOIC Tape and Reel M8.15 ISL8490IP -40 to 85 8 Ld PDIP E8.3 ISL8491IB -40 to 85 14 Ld SOIC M14.15 ISL8491IB-T -40 to 85 14 Ld SOIC Tape and Reel M14.15 ISL8491IP -40 to 85 14 Ld PDIP E14.3 2 B/Z 6 A/Y 5 GND 8 A 7 B 6 Z 5 Y 13 NC R 12 A 11 B DE 4 M14.15 -40 to 85 7 14 VCC RE 3 ISL8489IB-T VCC ISL8489, ISL8491 (PDIP, SOIC) TOP VIEW NC 1 8 Ld SOIC Tape and Reel 8 ISL8488, ISL8490 (PDIP, SOIC) TOP VIEW DI 5 ISL8489IB R D 10 Z GND 6 9 Y GND 7 8 NC ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Truth Tables RECEIVING TRANSMITTING INPUTS INPUTS OUTPUTS RE DE DI Z Y X 1 1 0 1 X 1 0 1 0 0 0 X High-Z High-Z 1 0 X High-Z * High-Z * RE OUTPUT DE DE Half Duplex Full Duplex A-B RO 0 0 X ≥ +0.2V 1 0 0 X ≤ -0.2V 0 0 0 X Inputs Open 1 1 0 0 X High-Z * 1 1 1 X High-Z *Shutdown Mode for ISL8483 (see Note 7) *Shutdown Mode for ISL8483 (see Note 7) Pin Descriptions PIN FUNCTION RO Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; 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/Y Noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output (Y) if DE = 1. B/Z Inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if DE = 1. A Noninverting receiver input. B Inverting receiver input. Y Noninverting driver output. Z Inverting driver output. VCC System power supply input (4.5V to 5.5V). NC No Connection. 3 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Typical Operating Circuits ISL8483, ISL8485 +5V +5V + + 0.1µF 0.1µF 8 8 VCC 1 RO 2 RE 3 DE 4 DI VCC R D B/Z 7 A/Y 6 RT RT DI 4 7 B/Z DE 3 6 A/Y RE 2 RO 1 DI 3 RO 2 DI 5 R D GND GND 5 5 ISL8488, ISL8490 +5V +5V + + 0.1µF 0.1µF 1 1 VCC 2 3 RO R VCC A 8 B 7 Z 6 Y 5 DI D RT RT 5 Y 6 Z 7 B 8 A GND D R GND 4 4 ISL8489, ISL8491 +5V +5V + + 0.1µF 0.1µF 14 14 VCC 2 RO R A 12 B 11 RT 9 Y 10 Z VCC D 3 RE DE 4 4 DE RE 3 RO 2 5 Z 10 Y 9 DI D GND RT 11 B 12 A R GND 6, 7 6, 7 4 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Absolute Maximum Ratings Thermal Information VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Input Voltages DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V) Input/Output Voltages A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V) Short Circuit Duration Y, Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous ESD Rating HBM (Per MIL-STD-883, Method 3015.7) . . . . . . . . . . . . . . >7kV Thermal Resistance (Typical, Note 1) θJA (oC/W) 8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . 170 8 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . 140 14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 120 14 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . 100 Moisture Sensitivity (see Technical Brief TB363) All Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1 Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only) Operating Conditions Temperature Range ISL84XXCX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC ISL84XXIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTE: 1. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details. Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25oC, Note 2 PARAMETER TEMP (oC) MIN TYP MAX UNITS Full - - VCC V R = 50Ω (RS-422), Figure 1 Full 2 3 - V R = 27Ω (RS-485), Figure 1 Full 1.5 2.3 5 V ∆VOD R = 27Ω or 50Ω, Figure 1 Full - 0.01 0.2 V VOC R = 27Ω or 50Ω, Figure 1 Full - - 3 V ∆VOC R = 27Ω or 50Ω, Figure 1 Full - 0.01 0.2 V SYMBOL TEST CONDITIONS DC CHARACTERISTICS Driver Differential VOUT (no load) VOD1 Driver Differential VOUT (with load) VOD2 Change in Magnitude of Driver Differential VOUT for Complementary Output States Driver Common-Mode VOUT Change in Magnitude of Driver Common-Mode VOUT for Complementary Output States Logic Input High Voltage VIH DE, DI, RE Full 2 - - V Logic Input Low Voltage VIL DE, DI, RE Full - - 0.8 V Logic Input Current IIN1 DE, DI, RE (ISL8483) Full -2 - 2 µA IIN1 DI (ISL8485 - ISL8491) Full -2 - 2 µA IIN1 DE, RE (ISL8485, ISL8489, ISL8491) Full -25 - 25 µA IIN2 DE = 0V, VCC = 0V or 4.5 to 5.5V VIN = 12V Full - - 1 mA VIN = -7V Full - - -0.8 mA -7V ≤ VCM ≤ 12V Full -0.2 - 0.2 V Input Current (A, B), Note 10 Receiver Differential Threshold Voltage VTH Receiver Input Hysteresis ∆VTH VCM = 0V 25 - 70 - mV Receiver Output High Voltage VOH IO = -4mA, VID = 200mV Full 3.5 - - V Receiver Output Low Voltage VOL IO = -4mA, VID = 200mV Full - - 0.4 V Three-State (high impedance) Receiver Output Current IOZR 0.4V ≤ VO ≤ 2.4V Full - - ±1 µA 5 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25oC, Note 2 (Continued) PARAMETER SYMBOL TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V Full 12 - - kΩ No-Load Supply Current, Note 3 ICC ISL8488, ISL8489, DE, DI, RE = 0V or VCC Full - 160 250 µA ISL8490, ISL8491, DE, DI, RE = 0V or VCC Full - 340 500 µA ISL8485, DI, RE = 0V or DE = VCC VCC DE = 0V Full - 550 900 µA Full - 340 500 µA ISL8483, DI, RE = 0V or DE = VCC VCC DE = 0V Full - 390 650 µA Full - 160 250 µA Shutdown Supply Current ISHDN ISL8483, DE = 0V, RE = VCC, DI = 0V or VCC Full - 1 50 nA Driver Short-Circuit Current, VO = High or Low IOSD1 DE = VCC, -7V ≤ VY or VZ ≤ 12V, Note 4 Full 35 - 250 mA Receiver Short-Circuit Current IOSR 0V ≤ VO ≤ VCC Full 7 - 85 mA Full 18 30 50 ns SWITCHING CHARACTERISTICS (ISL8485, ISL8490, ISL8491) Driver Input to Output Delay tPLH, tPHL RDIFF = 54Ω, CL = 100pF, Figure 2 Driver Output Skew Driver Differential Rise or Fall Time tSKEW RDIFF = 54Ω, CL = 100pF, Figure 2 Full - 2 10 ns tR, tF RDIFF = 54Ω, CL = 100pF, Figure 2 Full 3 11 25 ns Driver Enable to Output High tZH CL = 100pF, SW = GND, Figure 3 Full - 17 70 ns Driver Enable to Output Low tZL CL = 100pF, SW = VCC, Figure 3 Full - 14 70 ns Driver Disable from Output High tHZ CL = 15pF, SW = GND, Figure 3 Full - 19 70 ns Driver Disable from Output Low tLZ CL = 15pF, SW = VCC, Figure 3 Full - 13 70 ns Full 30 40 150 ns Figure 4 25 - 5 - ns Receiver Input to Output Delay tPLH, tPHL Figure 4 Receiver Skew | tPLH - tPHL | tSKD Receiver Enable to Output High tZH CL = 15pF, SW = GND, Figure 5 Full - 9 50 ns Receiver Enable to Output Low tZL CL = 15pF, SW = VCC, Figure 5 Full - 9 50 ns Receiver Disable from Output High tHZ CL = 15pF, SW = GND, Figure 5 Full - 9 50 ns Receiver Disable from Output Low tLZ CL = 15pF, SW = VCC, Figure 5 Full - 9 50 ns Full 5 - - Mbps Full 250 800 2000 ns Maximum Data Rate fMAX SWITCHING CHARACTERISTICS (ISL8483, ISL8488, ISL8489) Driver Input to Output Delay tPLH, tPHL RDIFF = 54Ω, CL = 100pF, Figure 2 Driver Output Skew Driver Differential Rise or Fall Time tSKEW RDIFF = 54Ω, CL = 100pF, Figure 2 Full - 160 800 ns 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 Full 250 350 2000 ns Figure 4 25 - 25 - ns Receiver Input to Output Delay tPLH, tPHL Figure 4 Receiver Skew | tPLH - tPHL | tSKD 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 6 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25oC, Note 2 (Continued) PARAMETER SYMBOL Receiver Disable from Output Low tLZ Maximum Data Rate TEST CONDITIONS CL = 15pF, SW = VCC, Figure 5 fMAX Time to Shutdown (ISL8483 only) tSHDN Note 7 TEMP (oC) MIN TYP MAX UNITS Full - 10 50 ns Full 250 - - kbps Full 50 200 600 ns Driver Enable from Shutdown to Output High (ISL8483 only) tZH(SHDN) CL = 100pF, SW = GND, Figure 3, Notes 7, 8 Full - - 2000 ns Driver Enable from Shutdown to Output Low (ISL8483 only) tZL(SHDN) CL = 100pF, SW = VCC, Figure 3, Notes 7, 8 Full - - 2000 ns Receiver Enable from Shutdown to Output High (ISL8483 only) tZH(SHDN) CL = 15pF, SW = GND, Figure 5, Notes 7, 9 Full - - 2500 ns Receiver Enable from Shutdown to Output Low (ISL8483 only) tZL(SHDN) CL = 15pF, SW = VCC, Figure 5, Notes 7, 9 Full - - 2500 ns 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. When testing the ISL8483, keep RE = 0 to prevent the device from entering SHDN. 6. When testing the ISL8483, the RE signal high time must be short enough (typically <200ns) to prevent the device from entering SHDN. 7. The ISL8483 is put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are guaranteed to have entered shutdown. See “Low-Power Shutdown Mode” section. 8. Keep RE = VCC, and set the DE signal low time >600ns to ensure that the device enters SHDN. 9. Set the RE signal high time >600ns to ensure that the device enters SHDN. 10. Devices meeting these limits are denoted as “single unit load (1 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus. Test Circuits and Waveforms R VCC DE Z DI VOD D Y R FIGURE 1. DRIVER VOD AND VOC 7 VOC ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Test Circuits and Waveforms (Continued) 3V DI 1.5V 1.5V 0V CL = 100pF DE VCC tPHL VOH Z DI tPLH RDIFF D 50% OUT (Y) Y 50% VOL CL = 100pF tPHL SIGNAL GENERATOR tPLH VOH OUT (Z) 50% 50% VOL 90% DIFF OUT (Y - Z) +VOD 90% 10% 10% tR -VOD tF SKEW = |tPLH (Y or Z) - tPHL (Z or Y)| FIGURE 2B. MEASUREMENT POINTS FIGURE 2A. TEST CIRCUIT FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES DE Z DI 500Ω SIGNAL GENERATOR SW Y 3V VCC D DE GND CL NOTE 7 1.5V 0V tZH, tZH(SHDN) NOTE 7 (SHDN) for ISL8483 only OUTPUT HIGH OUT (Y, Z) PARAMETER OUTPUT RE DI SW CL (pF) tHZ Y/Z X 1/0 GND 15 tLZ Y/Z X 0/1 VCC 15 tZH Y/Z 0 (Note 5) 1/0 GND 100 tZL Y/Z 0 (Note 5) 0/1 VCC 100 tZH(SHDN) Y/Z 1 (Note 8) 1/0 GND 100 tZL(SHDN) Y/Z 1 (Note 8) 0/1 VCC 100 1.5V tHZ VOH - 0.5V VOH 2.3V 0V tZL, tZL(SHDN) NOTE 7 tLZ VCC OUT (Y, Z) 2.3V OUTPUT LOW FIGURE 3A. TEST CIRCUIT VOL + 0.5V V OL FIGURE 3B. MEASUREMENT POINTS FIGURE 3. DRIVER ENABLE AND DISABLE TIMES (EXCLUDING ISL8488, ISL8490) RE +1.5V 3V 15pF B A R A 1.5V 1.5V RO 0V tPLH tPHL VCC SIGNAL GENERATOR 50% RO 50% 0V FIGURE 4A. TEST CIRCUIT FIGURE 4B. MEASUREMENT POINTS FIGURE 4. RECEIVER PROPAGATION DELAY 8 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Test Circuits and Waveforms (Continued) RE B R SIGNAL GENERATOR NOTE 7 1kΩ RO VCC SW A GND 3V RE 1.5V 1.5V 0V 15pF tZH, tZH(SHDN) NOTE 7 (SHDN) for ISL8483 only. RO A SW 0 +1.5V GND tLZ 0 -1.5V VCC NOTE 7 tZH (Note 6) 0 +1.5V GND RO 0 -1.5V VCC 0 +1.5V GND tZL(SHDN) (Note 9) 0 -1.5V VCC FIGURE 5A. TEST CIRCUIT VOH - 0.5V VOH 0V DE tHZ tZL (Note 6) tHZ 1.5V PARAMETER tZH(SHDN) (Note 9) OUTPUT HIGH tZL, tZL(SHDN) tLZ VCC 1.5V VOL + 0.5V V OUTPUT LOW OL FIGURE 5B. MEASUREMENT POINTS FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES (EXCLUDING ISL8488, ISL8490) Application Information RS-485 and RS-422 are differential (balanced) data transmission standards for use in long haul or noisy environments. RS-422 is a subset of RS-485, so RS-485 transceivers are also RS-422 compliant. RS-422 is a pointto-multipoint (multidrop) standard, which allows only one driver and up to 10 (assuming one unit load devices) receivers on each bus. RS-485 is a true multipoint standard, which allows up to 32 one unit load devices (any combination of drivers and receivers) on each bus. To allow for multipoint operation, the RS-485 spec requires that drivers must handle bus contention without sustaining any damage. Another important advantage of RS-485 is the extended common mode range (CMR), which specifies that the driver outputs and receiver inputs withstand signals that range from +12V to -7V. RS-422 and RS-485 are intended for runs as long as 4000’, so the wide CMR is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields. Receiver Features These devices utilize a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is ±200mV, as required by the RS422 and RS-485 specifications. Receiver input impedance surpasses the RS-422 spec of 4kΩ, and meets the RS-485 “Unit Load” requirement of 12kΩ minimum. Receiver inputs function with common mode voltages as great as ±7V outside the power supplies (i.e., +12V and -7V), making them ideal for long networks where induced voltages are a realistic concern. All the receivers include a “fail-safe if open” function that guarantees a high level receiver output if the receiver inputs are unconnected (floating). 9 Receivers easily meet the data rates supported by the corresponding driver. ISL8483/85/89/91 receiver outputs are three-statable via the active low RE input. Driver Features The RS-485/422 driver is a differential output device that delivers at least 1.5Vacross a 54Ω load (RS-485), and at least 2V across a 100Ω load (RS-422). The drivers feature low propagation delay skew to maximize bit width, and to minimize EMI. Drivers of the ISL8483/85/89/91 are three-statable via the active high DE input. The ISL8483/88/89 driver outputs are slew rate limited to minimize EMI, and to minimize reflections in unterminated or improperly terminated networks. Data rate on these slew rate limited versions is a maximum of 250kbps. Outputs of ISL8485/90/91 drivers are not limited, so faster output transition times allow data rates of at least 5Mbps. Data Rate, Cables, and Terminations RS-485/422 are intended for network lengths up to 4000’, but the maximum system data rate decreases as the transmission length increases. Devices operating at 5Mbps are limited to lengths less than 100’, while the 250kbps versions can operate at full data rates with lengths in excess of 1000’. Twisted pair is the cable of choice for RS-485/422 networks. Twisted pair cables tend to pick up noise and other electromagnetically induced voltages as common mode signals, which are effectively rejected by the differential receivers in these ICs. Proper termination is imperative, when using the 5Mbps devices, to minimize reflections. Short networks using the 250kbps versions need not be terminated, but, terminations are recommended unless power dissipation is an overriding concern. ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 In point-to-point, or point-to-multipoint (single driver on bus) networks, the main cable should be terminated in its characteristic impedance (typically 120Ω) at the end farthest from the driver. In multi-receiver applications, stubs connecting receivers to the main cable should be kept as short as possible. Multipoint (multi-driver) systems require that the main cable be terminated in its characteristic impedance at both ends. Stubs connecting a transceiver to the main cable should be kept as short as possible. In the event of a major short circuit condition, ISL84XX devices also include a thermal shutdown feature that disables the drivers whenever the die temperature becomes excessive. This eliminates the power dissipation, allowing the die to cool. The drivers automatically reenable after the die temperature drops about 15 degrees. If the contention persists, the thermal shutdown/reenable cycle repeats until the fault is cleared. Receivers stay operational during thermal shutdown. Built-In Driver Overload Protection Low Power Shutdown Mode (ISL8483 Only) As stated previously, the RS-485 spec requires that drivers survive worst case bus contentions undamaged. The ISL84XX devices meet this requirement via driver output short circuit current limits, and on-chip thermal shutdown circuitry. These CMOS transceivers all use a fraction of the power required by their bipolar counterparts, but the ISL8483 includes a shutdown feature that reduces the already low quiescent ICC to a 1nA trickle. The ISL8483 enters shutdown whenever the receiver and driver are simultaneously disabled (RE = VCC and DE = GND) for a period of at least 600ns. Disabling both the driver and the receiver for less than 50ns guarantees that the ISL8483 will not enter shutdown. The driver output stages incorporate short circuit current limiting circuitry which ensures that the output current never exceeds the RS-485 spec, even at the common mode voltage range extremes. Additionally, these devices utilize a foldback circuit which reduces the short circuit current, and thus the power dissipation, whenever the contending voltage exceeds either supply. Typical Performance Curves Note that receiver and driver enable times increase when the ISL8483 enables from shutdown. Refer to Notes 5-8, at the end of the Electrical Specification table, for more information. VCC = 5V, TA = 25oC, ISL8483 thru ISL8491; Unless Otherwise Specified 3.6 DIFFERENTIAL OUTPUT VOLTAGE (V) DRIVER OUTPUT CURRENT (mA) 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 DIFFERENTIAL OUTPUT VOLTAGE (V) FIGURE 6. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT VOLTAGE 10 3.4 3.2 RDIFF = 100Ω 3 2.8 2.6 2.4 RDIFF = 54Ω 2.2 2 -40 -25 0 25 50 75 85 TEMPERATURE (oC) FIGURE 7. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs TEMPERATURE ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Typical Performance Curves VCC = 5V, TA = 25oC, ISL8483 thru ISL8491; Unless Otherwise Specified (Continued) 160 600 140 550 120 Y OR Z = LOW 80 450 60 20 0 -20 Y OR Z = HIGH -40 250 -80 -100 150 -4 -2 0 2 4 6 OUTPUT VOLTAGE (V) 8 ISL8490/91, DE = RE = X 300 200 -7 -6 ISL8485, DE = GND, RE = X 350 -60 -120 ISL8483, DE = VCC, RE = X 400 40 ICC (µA) OUTPUT CURRENT (mA) 100 ISL8485, DE = VCC, RE = X 500 10 ISL8483, DE = GND, RE = GND; ISL8488/89, DE = RE = X 100 -40 12 -25 0 50 25 85 75 TEMPERATURE (oC) FIGURE 8. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE FIGURE 9. SUPPLY CURRENT vs TEMPERATURE 400 1200 tPLHY 1000 tPLHZ 300 |tPHLY - tPLHZ| 900 tPHLY 800 SKEW (ns) PROPAGATION DELAY (ns) 1100 tPHLZ 700 200 |tPLHY - tPHLZ| 100 600 500 -40 |CROSS PT. OF Y↑ & Z↓ - CROSS PT. OF Y↓ & Z↑| -25 0 25 50 75 0 -40 85 -25 TEMPERATURE (oC) 50 25 85 75 FIGURE 11. DRIVER SKEW vs TEMPERATURE (ISL8483, ISL8488, ISL8489) FIGURE 10. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL8483, ISL8488, ISL8489) 40 3 35 2.5 |tPHLY - tPLHZ| tPHLY 30 tPHLZ SKEW (ns) PROPAGATION DELAY (ns) 0 TEMPERATURE (oC) tPLHZ tPLHY 25 2 |tPLHY - tPHLZ| 1.5 |CROSSING PT. OF Y↑ & Z↓ - CROSSING PT. OF Y↓ & Z↑| 20 -40 -25 0 25 50 75 TEMPERATURE (oC) FIGURE 12. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL8485, ISL8490, ISL8491) 11 85 1 -40 -25 0 25 50 TEMPERATURE (oC) FIGURE 13. DRIVER SKEW vs TEMPERATURE (ISL8485, ISL8490, ISL8491) 75 85 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 0 5 RO DRIVER OUTPUT (V) 0 4 B/Z 2 A/Y 1 0 5 DI 0 5 RO 0 4 3 A/Y 2 B/Z 1 0 TIME (400ns/DIV) TIME (400ns/DIV) 5 DI 0 5 RO 0 4 3 2 RECEIVER OUTPUT (V) RDIFF = 54Ω, CL = 100pF DRIVER INPUT (V) FIGURE 15. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL8483, ISL8488, ISL8489) DRIVER OUTPUT (V) DRIVER OUTPUT (V) RECEIVER OUTPUT (V) FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL8483, ISL8488, ISL8489) B/Z A/Y 1 0 TIME (10ns/DIV) FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL8485, ISL8490, ISL8491) Die Characteristics SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 518 PROCESS: Si Gate CMOS 12 RDIFF = 54Ω, CL = 100pF 5 DI 0 5 RO 0 4 3 A/Y 2 B/Z 1 0 TIME (10ns/DIV) FIGURE 17. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL8485, ISL8490, ISL8491) DRIVER INPUT (V) 3 RDIFF = 54Ω, CL = 100pF DRIVER INPUT (V) DI RECEIVER OUTPUT (V) 5 DRIVER INPUT (V) VCC = 5V, TA = 25oC, ISL8483 thru ISL8491; Unless Otherwise Specified (Continued) RDIFF = 54Ω, CL = 100pF DRIVER OUTPUT (V) RECEIVER OUTPUT (V) Typical Performance Curves ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Dual-In-Line Plastic Packages (PDIP) E8.3 (JEDEC MS-001-BA ISSUE D) N 8 LEAD DUAL-IN-LINE PLASTIC PACKAGE E1 INDEX AREA 1 2 3 INCHES N/2 -B- -AD E BASE PLANE -C- A2 SEATING PLANE A L D1 e B1 D1 A1 eC B 0.010 (0.25) M C A B S MILLIMETERS SYMBOL MIN MAX MIN MAX NOTES A - 0.210 - 5.33 4 A1 0.015 - 0.39 - 4 A2 0.115 0.195 2.93 4.95 - B 0.014 0.022 0.356 0.558 - C L B1 0.045 0.070 1.15 1.77 8, 10 eA C 0.008 0.014 0.204 C D 0.355 0.400 9.01 eB NOTES: 1. Controlling Dimensions: INCH. In case of conflict between English and Metric dimensions, the inch dimensions control. 0.005 - 0.13 - 5 E 0.300 0.325 7.62 8.25 6 E1 0.240 0.280 6.10 7.11 5 e 0.100 BSC eA 0.300 BSC 3. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of Publication No. 95. eB - L 0.115 5. D, D1, and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch (0.25mm). 6. E and eA are measured with the leads constrained to be perpendicular to datum -C- . 7. eB and eC are measured at the lead tips with the leads unconstrained. eC must be zero or greater. 8. B1 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25mm). 9. N is the maximum number of terminal positions. 10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3, E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 - 1.14mm). 13 5 D1 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 4. Dimensions A, A1 and L are measured with the package seated in JEDEC seating plane gauge GS-3. 0.355 10.16 N 8 2.54 BSC 7.62 BSC 0.430 - 0.150 2.93 8 6 10.92 7 3.81 4 9 Rev. 0 12/93 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Dual-In-Line Plastic Packages (PDIP) E14.3 (JEDEC MS-001-AA ISSUE D) N 14 LEAD DUAL-IN-LINE PLASTIC PACKAGE E1 INDEX AREA 1 2 3 INCHES N/2 SYMBOL -B- -C- A2 SEATING PLANE e B1 D1 A1 eC B 0.010 (0.25) M C A B S MAX NOTES - 0.210 - 5.33 4 0.015 - 0.39 - 4 A2 0.115 0.195 2.93 4.95 - B 0.014 0.022 0.356 0.558 - C L B1 0.045 0.070 1.15 1.77 8 eA C 0.008 0.014 0.204 0.355 - D 0.735 0.775 18.66 D1 0.005 - 0.13 - 5 A L D1 MIN A E BASE PLANE MAX A1 -AD MILLIMETERS MIN C eB NOTES: 1. Controlling Dimensions: INCH. In case of conflict between English and Metric dimensions, the inch dimensions control. 19.68 5 E 0.300 0.325 7.62 8.25 6 E1 0.240 0.280 6.10 7.11 5 e 0.100 BSC 2.54 BSC - 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. eA 0.300 BSC 7.62 BSC 6 3. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of Publication No. 95. eB - 0.430 - 10.92 7 L 0.115 0.150 2.93 3.81 4 4. Dimensions A, A1 and L are measured with the package seated in JEDEC seating plane gauge GS-3. 5. D, D1, and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch (0.25mm). 6. E and eA are measured with the leads constrained to be perpendicular to datum -C- . 7. eB and eC are measured at the lead tips with the leads unconstrained. eC must be zero or greater. 8. B1 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25mm). 9. N is the maximum number of terminal positions. 10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3, E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 1.14mm). 14 N 14 14 9 Rev. 0 12/93 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Small Outline Plastic Packages (SOIC) M8.15 (JEDEC MS-012-AA ISSUE C) N INDEX AREA 0.25(0.010) M H 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE B M E INCHES -B- 1 2 SYMBOL 3 L SEATING PLANE -A- h x 45o A D -C- e µα A1 B 0.25(0.010) M C C A M B S 1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. Dimension “E” does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. “L” is the length of terminal for soldering to a substrate. 7. “N” is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact. 15 MILLIMETERS MIN MAX NOTES A 0.0532 0.0688 1.35 1.75 - 0.0040 0.0098 0.10 0.25 - B 0.013 0.020 0.33 0.51 9 C 0.0075 0.0098 0.19 0.25 - D 0.1890 0.1968 4.80 5.00 3 E 0.1497 0.1574 3.80 4.00 4 0.050 BSC 1.27 BSC - H 0.2284 0.2440 5.80 6.20 - h 0.0099 0.0196 0.25 0.50 5 L 0.016 0.050 0.40 1.27 6 8o 0o N NOTES: MAX A1 e 0.10(0.004) MIN α 8 0o 8 7 8o Rev. 0 12/93 ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Small Outline Plastic Packages (SOIC) M14.15 (JEDEC MS-012-AB ISSUE C) N INDEX AREA 0.25(0.010) M H 14 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE B M E INCHES -B- 1 2 3 L SEATING PLANE -A- h x 45o A D -C- µα e A1 B 0.25(0.010) M C A M SYMBOL MIN MAX MIN MAX NOTES A 0.0532 0.0688 1.35 1.75 - A1 0.0040 0.0098 0.10 0.25 - B 0.013 0.020 0.33 0.51 9 C 0.0075 0.0098 0.19 0.25 - D 0.3367 0.3444 8.55 8.75 3 E 0.1497 0.1574 3.80 4.00 4 e C 0.10(0.004) B S 0.050 BSC 1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of Publication Number 95. 1.27 BSC - H 0.2284 0.2440 5.80 6.20 - h 0.0099 0.0196 0.25 0.50 5 L 0.016 0.050 0.40 1.27 6 N NOTES: MILLIMETERS α 14 0o 14 8o 0o 7 8o Rev. 0 12/93 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. Dimension “E” does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. “L” is the length of terminal for soldering to a substrate. 7. “N” is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact. All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 16