DATASHEET ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, 20Mbps, Full Fail-safe, Low Power, RS-485/RS-422 Receivers ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E The Intersil ISL3280E, ISL3281E, ISL3282E, ISL3283E, Features ISL3284E, ISL3285E are ±16.5kV IEC61000 ESD Protected, • IEC61000 ESD protection on RS-485 inputs . . . . . . . ±16.5kV - Class 3 ESD level on all other pins. . . . . . . . . . . .>5kV HBM 3.0V to 5.5V powered, single receivers that meet both the RS-485 and RS-422 standards for balanced communication. These receivers have very low bus currents (+125µA/-100µA), so they present a true “1/8 unit load” to the RS-485 bus. This allows up to 256 receivers on the network without violating the RS-485 specification’s 32 unit load maximum and without using repeaters. • Pb-free (RoHS compliant) • Wide supply range . . . . . . . . . . . . . . . . . . . . . . . . . 3.0V to 5.5V • Specified for +125°C operation • Logic supply pin (VL) eases operation in mixed supply systems (ISL3282E, ISL3284E, ISL3285E only) Receiver inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or terminated but undriven. • Full fail-safe (open, short, terminated/undriven) • True 1/8 unit load allows up to 256 devices on the bus The ISL3280E and ISL3284E feature an always enabled Rx; the ISL3281E and ISL3285E feature an active high Rx enable pin and the ISL3282E and ISL3283E include an active low enable pin. All versions are offered in Industrial and Extended Industrial (-40°C to +125°C) temperature ranges. • High data rates. . . . . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps • Low quiescent supply current. . . . . . . . . . . . . . . 500µA (max) - Very low shutdown supply current . . . . . . . . . . 20µA (max) • -7V to +12V common mode input voltage range A 26% smaller footprint is available with the ISL3282E and ISL3285E TDFN package. These devices, plus the ISL3284E, also feature a logic supply pin (VL) that sets the VOH level of the RO output (and the switching points of the RE/RE input) to be compatible with another supply voltage in mixed voltage systems. • Tri-statable Rx available (active low or high EN input) • 5V tolerant logic inputs when VCC ≤ 5V Applications • Clock distribution For companion single RS-485 transmitters in micro packages, please see the ISL3293E datasheet. • High node count systems • Space constrained systems • Security camera networks • Building environmental control/lighting systems • Industrial/process control networks TABLE 1. SUMMARY OF FEATURES FUNCTION DATA RATE (Mbps) # DEVICES ON BUS VL PIN? QUIESCENT ICC (µA) LOW POWER SHUTDOWN? LEAD COUNT ISL3280E 1 Rx 20 256 NO NO 350 NO 5-SOT ISL3281E 1 Rx 20 256 ACTIVE HIGH NO 350 YES 6-SOT ISL3282E 1 Rx 20 256 ACTIVE LOW YES 350 YES 8-TDFN ISL3283E 1 Rx 20 256 ACTIVE LOW NO 350 YES 6-SOT ISL3284E 1 Rx 20 256 NO YES 350 NO 6-SOT ISL3285E (No longer available or supported) 1 Rx 20 256 ACTIVE HIGH YES 350 YES 8-TDFN PART NUMBER July 27, 2015 FN6543.4 1 RX ENABLE? CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2007, 2014, 2015. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Pin Configurations ISL3281E (6 LD SOT-23) TOP VIEW ISL3280E (5 LD SOT-23) TOP VIEW VCC 1 5 GND 2 A VCC GND 2 R RO 3 1 4 B RO 3 1 GND 2 NC VCC 8 B 7 RE 3 6 VL 4 5 A R VCC 1 GND 2 1 GND 2 R RO 3 2 5 RE 4 B 6 A 5 RE 4 B ISL3285E (8 LD TDFN) TOP VIEW 6 A 5 VL 4 B RO 1 BL E ILA GND 2 R AVA E G R L ON NO NC 3 VCC Submit Document Feedback R RO 3 ISL3284E (6 LD SOT-23) TOP VIEW VCC A ISL3283E (6 LD SOT-23) TOP VIEW ISL3282E (8 LD TDFN) TOP VIEW RO R 6 4 TE P OR SUP OR 8 B 7 RE 6 VL 5 A D FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Ordering Information PART NUMBER (Notes 1, 2, 3) PART MARKING (Note 4) TEMP. RANGE (°C) PACKAGE (RoHS Compliant) PKG. DWG. # ISL3280EFHZ-T 280F -40 to +125 5 Ld SOT-23 P5.064 ISL3280EIHZ-T 280I -40 to +85 5 Ld SOT-23 P5.064 ISL3281EFHZ-T 281F -40 to +125 6 Ld SOT-23 P6.064 ISL3281EIHZ-T 281I -40 to +85 6 Ld SOT-23 P6.064 ISL3282EFRTZ-T 82F -40 to +125 8 Ld TDFN L8.2x3A ISL3282EIRTZ-T 82I -40 to +85 8 Ld TDFN L8.2x3A ISL3283EFHZ-T 283F -40 to +125 6 Ld SOT-23 P6.064 ISL3283EIHZ-T 283I -40 to +85 6 Ld SOT-23 P6.064 ISL3284EFHZ-T 284F -40 to +125 6 Ld SOT-23 P6.064 ISL3284EIHZ-T 284I -40 to +85 6 Ld SOT-23 P6.064 ISL3285EFRTZ-T (No longer available or supported) 85F -40 to +125 8 Ld TDFN L8.2x3A ISL3285EIRTZ-T (No longer available or supported) 85I -40 to +85 8 Ld TDFN L8.2x3A NOTES: 1. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil 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. 2. Please refer to TB347 for details on reel specifications. 3. For Moisture Sensitivity Level (MSL), please see product information page for ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E. For more information on MSL, please see tech brief TB363. 4. SOT-23 “PART MARKING” is branded on the bottom side. Submit Document Feedback 3 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Truth Table RECEIVING INPUTS OUTPUT RE, RE A-B RO 1, 0 ≥ -0.05V 1 1, 0 ≤ -0.2V 0 1, 0 Inputs Open/Shorted 1 0, 1 X High-Z* NOTE: *Shutdown Mode, except for ISL3280E, ISL3284E Pin Descriptions PIN NAME RO RE, RE GND FUNCTION Receiver output: If A - B -50mV, RO is high; If A - B -200mV, RO is low; RO = High if A and B are unconnected (floating) or shorted. Receiver output enable. RO is enabled when RE/RE is high / low; RO is high impedance when RE/RE is low/high. If the Rx enable function is not used, connect RE directly to GND, or connect RE through a 1kΩ, or greater, resistor to VCC. RE/RE are internally pulled low/high. Ground connection. This is also the potential of the TDFN thermal pad. A ±16.5kV IEC61000 ESD protected RS-485, RS-422 level, noninverting receiver input. B ±16.5kV IEC61000 ESD protected RS-485, RS-422 level, inverting receiver input. VCC System power supply input (3.0V to 5.5V). On devices with a VL pin powered from a separate supply, power-up VCC first. VL Logic-level supply, which sets the VIL / VIH levels for the RE (ISL3282E only) and RE (ISL3285E only) pins and sets the VOH level of the RO output (ISL3282E, ISL3284E, ISL3285E only). If VL and VCC are different supplies, power-up this supply after VCC and keep VL ≤ VCC. NC No Connection. Typical Operating Circuits +3.3V TO 5V +3.3V + 1 0.1µF 0.1µF + 2 VCC VCC ISL3281E 3 RO R ISL329xE A 6 B 4 RT 6 Y 4 Z D 5 RE DI 1 DE 3 GND GND 2 5 FIGURE 1. NETWORK WITH ENABLES Submit Document Feedback 4 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Typical Operating Circuits (Continued) +3.3V TO 5V +3.3V + 1 VCC 0.1µF 0.1µF + 2 R 3 VCC ISL3280E 3 RO 1kΩ TO 3kΩ ISL329xE A 5 B 4 RT 6 Y 4 Z DE D GND GND 2 5 DI 1 FIGURE 2. NETWORK WITHOUT ENABLES 1.8V +3.3V TO 5V +3.3V + 4 VCC 6 VL VCC 0.1µF 0.1µF 8 1 RO R 1 VCC ISL3282E LOGIC DEVICE (µP, ASIC, UART) 2.5V + VL ISL3298E A 5 B 8 RT 6 Y 7 Z D 7 RE DI 3 DE 2 GND 2 VCC NOTE: IF POWERED FROM SEPARATE SUPPLIES, POWER-UP VCC BEFORE VL LOGIC DEVICE (P, ASIC, UART) GND 4, 5 FIGURE 3. NETWORK WITH VL PIN FOR INTERFACE TO LOWER VOLTAGE LOGIC DEVICES Submit Document Feedback 5 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Absolute Maximum Ratings Thermal Information VCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V VL to GND (ISL3282E, ISL3284E, ISL3285E Only) . . . -0.3V to (VCC +0.3V) Input Voltages RE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Input/Output Voltages A, B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +13V RO (Not ISL3282E, ISL3284E, ISL3285E). . . . . . . . -0.3V to (VCC +0.3V) RO (ISL3282E, ISL3284E, ISL3285E) . . . . . . . . . . . . -0.3V to (VL +0.3V) Short-circuit Duration RO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table Thermal Resistance (Typical) JA (°C/W) JC (°C/W) 190 N/A 5 Ld SOT-23 Package (Note 5) . . . . . . . . . . 6 Ld SOT-23 Package (Note 5) . . . . . . . . . . 177 N/A 8 Ld TDFN Package (Notes 6, 7). . . . . . . . . 65 8 Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . +150°C Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493 Operating Conditions Temperature Range F Suffix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C I Suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 5. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 6. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 7. For JC, the “case temp” location is the center of the exposed metal pad on the package underside. Electrical Specifications Test Conditions: VCC = 3.0V to 5.5V; VL = VCC (ISL3282E, ISL3284E, ISL3285E only); Typicals are at TA = +25°C (Note 12); Unless Otherwise Specified (Note 8). PARAMETER SYMBOL TEST CONDITIONS TEMP (°C) MIN TYP MAX (Note 11) (Note 12) (Note 11) UNIT DC CHARACTERISTICS VL = VCC if ISL3282E, or ISL3285E VCC 3.6V VCC 5.5V VIH3 2.7V VL < 3.0V VIH4 2.3V VL < 2.7V ISL3282E and ISL3285E only VIH5 1.6V VL < 2.3V VIH6 1.35V VL < 1.6V VIL1 VL = VCC if ISL3282E or ISL3285E Full - - 0.7 V Full - - 0.6 V VIH1 Input High Voltage (RE, RE) (Notes 9, 10) VIH2 Input Low Voltage (RE, RE) (Notes 9, 10) ISL3282E and ISL3285E only Full 2 - - V Full 2.4 - - V Full 1.7 - - V Full 1.6 - - V Full 0.72*VL - - V 25 - 0.5*VL - V Full - - 0.7 V VIL2 VL 2.7V VIL3 2.3V VL < 2.7V VIL4 1.6V VL < 2.3V Full - - 0.25*VL V VIL5 1.35V VL < 1.6V 25 - 0.33*VL - V Logic Input Current (Note 9) IIN1 RE = RE = 0V or VCC Full -15 ±9 15 µA Input Current (A, B) IIN2 VCC = 0V, 3.6V, or 5.5V Full - 80 125 µA Receiver Differential Threshold Voltage V TH -7V VCM 12V VIN = 12V VIN = -7V Full -100 -50 - µA Full -200 -125 -50 mV Receiver Input Hysteresis V TH VCM = 0V 25 - 15 - mV Receiver Input Resistance RIN -7V VCM 12V Full - 150 - kΩ Receiver Short-Circuit Current IOSR 0V VO VCC Full ±7 ±30 ±85 mA Receiver Output High Voltage VOH1 IO = -3.5mA, VID = -50mV (VL = VCC if ISL3282E, ISL3284E, ISL3285E) Full VCC - 0.4 - - V VOH2 IO = -1mA, VL 1.6V Full VL - 0.4 - - V VOH3 IO = -500µA, VL = 1.5V Full 1.2 - - V VOH4 IO = -150µA, VL = 1.35V Full 1.15 - - V VOH5 IO = -100µA, VL 1.35V Full VL - 0.1 - - V Submit Document Feedback 6 ISL3282E, ISL3284E and ISL3285E only FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Electrical Specifications Test Conditions: VCC = 3.0V to 5.5V; VL = VCC (ISL3282E, ISL3284E, ISL3285E only); Typicals are at TA = +25°C (Note 12); Unless Otherwise Specified (Note 8). (Continued) PARAMETER SYMBOL Receiver Output Low Voltage Three-state (high impedance) Receiver Output Current (Notes 9, 10) TEST CONDITIONS TEMP (°C) MIN TYP MAX (Note 11) (Note 12) (Note 11) UNIT VOL1 IO = 4mA, VID = -200mV, VL 2.2V if ISL3282E, ISL3284E, ISL3285E Full - 0.2 0.4 V Full - 0.2 0.4 V VOL2 IO = 2mA, VL 1.5V VOL3 IO = 1mA, VL 1.35V VOL4 IO = 500µA, VL 1.35V IOZR ISL3282E, ISL3284E and ISL3285E only Full - 0.1 0.4 V 25 - 0.1 - V 0V VO VCC Full -1 0.015 1 µA ICC RE/RE = VCC/0V Full - 400 500 µA ISHDN RE/RE = 0V/VCC Full - - 20 µA IEC61000-4-2, Air-Gap Discharge Method 25 - ±16.5 - kV IEC61000-4-2, Contact Discharge Method 25 - ±9 - kV SUPPLY CURRENT No-Load Supply Current Shutdown Supply Current (Note 9) ESD PERFORMANCE RS-485 Pins (A, B) All Pins Human Body Model, from bus pins to GND 25 - ±16.5 - kV HBM, per MIL-STD-883 Method 3015 25 - ±5 - kV MM 25 - ±250 - V VID = ±2V, VCM = 0V (Figure 4 and Table 2) (Note 12) Full 20 30, 24 - Mbps VID = ±2V, VCM = 0V (Figure 4) Full 20 36 60 ns RECEIVER SWITCHING CHARACTERISTICS Maximum Data Rate Receiver Input to Output Delay fMAX tPLH, tPHL Receiver Skew | tPLH - tPHL | VL 1.5V (Figure 4) ISL3282E, ISL3284E and ISL3285E only 25 - 44 - ns tSK1 VCC = 3.3V ±10% (Figure 4) Full - 1 5.5 ns tSK2 VCC = 5V ±10% (Figure 4) VL = VCC if ISL3282E, ISL3284E, or ISL3285E Full - 2 7.5 ns tSK3 VL 1.8V (Figure 4) tSK4 VL = 1.5V (Figure 4) ISL3282E, ISL3284E and ISL3285E only Receiver Enable to Output High (Note 9) tZH RL = 1kΩ, CL = 15pF, SW = GND (Figure 5) (Note 12) VL 1.5V (Note 12) Receiver Enable to Output Low (Note 9) tZL RL = 1kΩ, CL = 15pF, SW = VCC (Figure 5) (Note 12) VL 1.5V (Note 12) Receiver Disable from Output High (Note 9) tHZ RL = 1kΩ, CL = 15pF, SW = GND (Figure 5) Receiver Disable from Output Low (Note 9) tLZ RL = 1kΩ, CL = 15pF, SW = VCC (Figure 5) VL 1.5V (Note 12) VL 1.5V (Note 12) 25 - 2 - ns 25 - 4 - ns Full - 240, 90 500 ns 25 - 250, 120 - ns Full - 240, 90 500 ns 25 - 250, 120 - ns Full - 10 20 ns 25 - 24, 20 - ns Full - 10 20 ns 25 - 24, 20 - ns NOTES: 8. 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. 9. Does not apply to the ISL3280E or ISL3284E. 10. If the Rx enable function isn’t needed, connect the enable pin to the appropriate supply, as described in the “Pin Descriptions” table on page 4 11. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested. 12. Typical values are at 3.3V, 5V. Parameters with a single entry in the “TYP” column apply to 3.3V and 5V. Submit Document Feedback 7 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Test Circuits and Waveforms RE VCC GND B R A +1V B RE 0V 15pF RO 0V -1V A tPLH tPHL VCC OR VL SIGNAL GENERATORS 50% RO 50% 0V FIGURE 4A. TEST CIRCUIT FIGURE 4B. MEASUREMENT POINTS FIGURE 4. RECEIVER PROPAGATION DELAY AND DATA RATE RE OR RE GND 3V B A 1kΩ RO R VCC OR VL SW SIGNAL GENERATOR RE (INVERT FOR RE) 1.5V 1.5V 0V GND tZH 15pF OUTPUT HIGH A SW tHZ +1.5V GND tLZ -1.5V VCC OR VL tZH +1.5V GND tZL -1.5V VCC OR VL FIGURE 5A. TEST CIRCUIT V VOH - 0.25V OH 50% RO PARAMETER tHZ 0V tZL RO tLZ VCC OR VL 50% OUTPUT LOW VOL + 0.25V V OL FIGURE 5B. MEASUREMENT POINTS FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES (EXCEPT ISL3280E AND ISL3284E) 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 point-to-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. 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. Submit Document Feedback 8 Receiver Features These devices utilize a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is better than ±200mV, as required by the RS-422 and RS-485 specifications. Receiver input resistance of 96kΩ surpasses the RS-422 specification of 4kΩ and is eight times the RS-485 “Unit Load (UL)” requirement of 12kΩ minimum. Thus, these products are known as “one-eighth UL” transceivers and there can be up to 256 of these devices on a network while still complying with the RS-485 loading specification. Receiver inputs function with common mode voltages as great as +9V/-7V outside the power supplies (i.e., +12V and -7V), making them ideal for long networks where induced voltages and ground potential differences are realistic concerns. FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E All the receivers include a “full fail-safe” function that guarantees a high level receiver output if the receiver inputs are unconnected (floating), shorted together, or connected to a terminated but undriven bus. Fail-safe with shorted inputs is achieved by setting the Rx upper switching point to -50mV, thereby ensuring that the Rx sees 0V differential as a high input level. All receivers easily support a 20Mbps data rate and all receiver outputs (except on the ISL3280E and ISL3284E) are tri-statable via the active low RE input or by the active high RE input. TABLE 2. VIH, VIL AND DATA RATE vs VL FOR VCC = 3.3V OR 5V VL (V) VIH (V) VIL (V) DATA RATE (Mbps) 1.35 0.55 0.5 11 1.6 0.7 0.6 16 1.8 0.8 0.7 23 2.3 1 0.9 27 2.7 1.1 1 30 3.3 1.3 1.2 30 5.5 (i.e., VCC) 2 1.8 24 VCC = +3.3V RO RE VCC = +2V VOH = 3.3V RXD VIH 2V VOH 2V GND ISL3283E ESD DIODE GND VCC = +2V VL RO RE VOH = 2V RXD VIH = 1V GND VOH 2V ISL3282E The ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E are designed to operate with a wide range of supply voltages from 3.0V to 5.5V. These devices meet the RS-422 and RS-485 specifications over this full range. Logic Supply (VL Pin, ISL3282E, ISL3284E, ISL3285E Only) Note: If powered from separate supplies, power-up VCC before powering up the VL supply and keep VL ≤ VCC. The ISL3282E, ISL3284E and ISL3285E include a VL pin that powers the logic input (RE or RE) and/or the Rx output. These pins interface with “logic” devices such as UARTs, ASICs and microcontrollers and today most of these devices use power supplies significantly lower than 3.3V. Thus, a 3.3V output level from a 3.3V powered RS-485 IC might seriously overdrive and damage the logic device input. Similarly, the logic device’s low VOH might not exceed the VIH of a 3.3V or 5V powered RE input. Connecting the VL pin to the power supply of the logic device (as shown in Figure 6) limits the ISL3282E, ISL3284E, ISL3285E’s Rx output VOH to VL (see Figures 9 through 13) and reduces the RE/RE input switching point to a value compatible with the logic device’s output levels. Tailoring the logic pin input switching point and output levels to the supply voltage of the UART, ASIC, or microcontroller eliminates the need for a level shifter/translator between the two ICs. VL can be anywhere from VCC down to 1.35V, but the input switching points may not provide enough noise margin when VL < 1.6V. Table 2 indicates typical VIH, VIL and data rate values for various VL settings so the user can ascertain whether or not a particular VL voltage meets his/her needs. The quiescent, RO unloaded, VL supply current (IL) is typically less than 60µA for VL ≤ 3.3V, as shown in Figure 8. ESD Protection RXEN UART/PROCESSOR VCC = +3.3V TO 5V Wide Supply Range ESD DIODE RXEN GND All pins on these devices include class 3 (>4kV) Human Body Model (HBM) ESD protection structures, but the RS-485 pins (receiver inputs) incorporate advanced structures allowing them to survive ESD events in excess of ±16.5kV HBM and ±16.5kV IEC61000. The RS-485 pins are particularly vulnerable to ESD damage because they typically connect to an exposed port on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can cause an ESD event that might destroy unprotected ICs. These new ESD structures protect the device whether or not it is powered up and without degrading the RS-485 common mode range of -7V to +12V. This built-in ESD protection eliminates the need for board level protection structures (e.g., transient suppression diodes) and the associated, undesirable capacitive load they present. UART/PROCESSOR FIGURE 6. USING VL PIN TO ADJUST LOGIC LEVELS Submit Document Feedback 9 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E IEC61000-4-2 Testing Data Rate, Cables and Terminations The IEC61000 test method applies to finished equipment, rather than to an individual IC. Therefore, the pins most likely to suffer an ESD event are those that are exposed to the outside world (the RS-485 pins in this case) and the IC is tested in its typical application configuration (power applied) rather than testing each pin-to-pin combination. The lower current limiting resistor coupled with the larger charge storage capacitor yields a test that is much more severe than the HBM test. The extra ESD protection built into this device’s RS-485 pins allows the design of equipment meeting level 4 criteria without the need for additional board level protection on the RS-485 port. RS-485, RS-422 are intended for network lengths up to 4000’, but the maximum system data rate decreases as the transmission length increases. Networks operating at 20Mbps are limited to lengths less than 100’, while a 250kbps network that uses slew rate limited transmitters can operate at that data rate over lengths of several thousand feet. AIR-GAP DISCHARGE TEST METHOD To minimize reflections, proper termination is imperative for high data rate networks. Short networks using slew rate limited transmitters need not be terminated, but terminations are recommended unless power dissipation is an overriding concern. For this test method, a charged probe tip moves toward the IC pin until the voltage arcs to it. The current waveform delivered to the IC pin depends on approach speed, humidity, temperature, etc., so it is difficult to obtain repeatable results. The A and B RS-485 pins withstand ±16.5kV air-gap discharges. CONTACT DISCHARGE TEST METHOD During the contact discharge test, the probe contacts the tested pin before the probe tip is energized, thereby eliminating the variables associated with the air-gap discharge. The result is a more repeatable and predictable test, but equipment limits prevent testing devices at voltages higher than ±9kV. The ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E survive ±9kV contact discharges on the RS-485 pins. Twisted pair is the cable of choice for RS-485, RS-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 receiver in these ICs. 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 transmitter or receiver to the main cable should be kept as short as possible. Low Power Shutdown Mode These BiCMOS receivers all use a fraction of the power required by their bipolar counterparts and the versions with output enable functions include a shutdown feature that reduces the already low quiescent ICC to a 20µA trickle. These versions enter shutdown whenever the receiver disables (RE = VCC or RE = GND). Typical Performance Curves CL = 15pF, TA = +25°C; unless otherwise specified. 250 0.50 0.40 0.30 IL (A) ICC (mA) 200 VCC = VL = 3.3V 0.35 0.25 150 VL = 5V, VCC = 5V ONLY 100 0.20 0.15 0.10 50 VL 1.8V VL = 3.3V RE = VCC, RE = 0V 0.05 0 -40 VCC = 5V OR 3.3V VCC = VL = 5V 0.45 -15 10 60 35 TEMPERATURE (°C) 85 110 125 FIGURE 7. SUPPLY CURRENT vs TEMPERATURE Submit Document Feedback 10 0 VL = 2.5V 0 1 2 3 4 5 6 7 7.5 RE VOLTAGE (V) FIGURE 8. VL SUPPLY CURRENT vs ENABLE PIN VOLTAGE FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Typical Performance Curves 30 VCC = VL = 5V VOL, +25°C VOH, +25°C 50 40 RECEIVER OUTPUT CURRENT (mA) RECEIVER OUTPUT CURRENT (mA) 60 CL = 15pF, TA = +25°C; unless otherwise specified. (Continued) VOL, +85°C VOL, +125°C VOH, +125°C 30 VOH, +85°C 20 10 0 1 0 2 3 4 VOL, +25°C 25 15 10 5 VCC = 5V OR 3.3V, VL = 3.3V 0 0.5 9 VOL, +25°C VOL, +85°C 16 14 VOL, +125°C 12 VOH, +25°C 10 8 VOH, +85°C VOH, +125°C 6 4 2 0 0 0.5 1.0 1.5 2.0 VOL, +85°C 6 VOL, +125°C 5 VOH, +25°C 4 VOH, +125°C 2 1 0 0.5 VOL, +125°C 3.0 2.5 2.0 VOH, +25°C VOH, +85°C 1.5 VOH, +125°C 1.0 1.0 1.5 1.8 FIGURE 12. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT VOLTAGE VOL, +25°C 4.0 3.5 VOH, +85°C 3 55 VOL, +85°C 3.0 3.3 RECEIVER OUTPUT VOLTAGE (V) PROPAGATION DELAY (ns) RECEIVER OUTPUT CURRENT (mA) 4.5 2.5 VOL, +25°C 7 0 2.5 FIGURE 11. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT VOLTAGE VCC = 5V or 3.3V, VL = 1.5V 2.0 VCC = 5V OR 3.3V, VL = 1.8V 8 RECEIVER OUTPUT VOLTAGE (V) 5.0 1.5 FIGURE 10. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT VOLTAGE RECEIVER OUTPUT CURRENT (mA) RECEIVER OUTPUT CURRENT (mA) VCC = 5V OR 3.3V, VL = 2.5V 1.0 RECEIVER OUTPUT VOLTAGE (V) FIGURE 9. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT VOLTAGE 18 VOH, +85°C VOH, +125°C RECEIVER OUTPUT VOLTAGE (V) 20 VOL, +125°C 20 0 5 VOL, +85°C VOH, +25°C VCC = 5V 50 VL = 1.5V 45 VL = 1.8V 40 VL = 2.5V 35 0.5 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.5 RECEIVER OUTPUT VOLTAGE (V) FIGURE 13. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT VOLTAGE Submit Document Feedback 11 30 -40 -15 10 35 60 85 110 125 TEMPERATURE (°C) FIGURE 14. RECEIVER PROPAGATION DELAY vs TEMPERATURE FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Typical Performance Curves 5.0 |tPLH - tPHL| CL = 15pF, TA = +25°C; unless otherwise specified. (Continued) 55 VCC = 5V 4.5 SKEW (ns) 3.5 3.0 2.5 VL = 2.5V 2.0 VL = 1.8V 1.5 50 PROPAGATION DELAY (ns) VL = 1.5V 4.0 1.0 VCC = 3.3V VL = 1.5V 45 VL = 1.8V 40 VL = 2.5V 35 0.5 0 -40 -15 10 35 60 85 110 30 -40 125 -15 10 TEMPERATURE (°C) |tPLH - tPHL| VCC = 3.3V 3.5 VL = 1.5V 2.0 RECEIVER OUTPUT (V) SKEW (ns) 3.0 2.5 1.5 VL = 1.8V 1.0 VL = 2.5V 0.5 VL = 1.8V 0 -40 -15 10 35 60 RECEIVER INPUT (V) 110 125 85 110 VCC = 5V 0 -2.0 A-B VL = 5V 5.0 4.0 VL = 2.5V 3.0 2.0 1.0 0 VL = 1.5V 125 TIME (20ns/DIV) FIGURE 17. RECEIVER SKEW vs TEMPERATURE RECEIVER OUTPUT (V) 85 2.0 TEMPERATURE (°C) VCC = 3.3V 2.0 FIGURE 18. RECEIVER WAVEFORMS Die Characteristics SUBSTRATE AND TDFN THERMAL PAD POTENTIAL (POWERED UP): 0 -2.0 60 FIGURE 16. RECEIVER PROPAGATION DELAY vs TEMPERATURE RECEIVER INPUT (V) FIGURE 15. RECEIVER SKEW vs TEMPERATURE 4.0 35 TEMPERATURE (°C) A-B GND 4.0 VL = 3.3V 3.0 VL = 2.5V 2.0 VL = 1.5V 1.0 TRANSISTOR COUNT: 140 PROCESS: Si Gate BiCMOS 0 TIME (20ns/DIV) FIGURE 19. RECEIVER WAVEFORMS Submit Document Feedback 12 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to the web to make sure that you have the latest revision. DATE REVISION CHANGE July 27, 2015 FN6543.4 - Added “No longer available or supported” statement to ISL3285E in Table 1 on page 1, Ordering Information table on page 3 and ISL3285E pin configuration on page 2. Replaced L8.2x3A package outline drawing with the newest revision. Changes from revision 1 to revision 2: Tiebar Note updated From: Tiebar shown (if present) is a non-functional feature. To: Tiebar shown (if present) is a non-functional feature and may be located on any of the 4 sides (or ends). December 4, 2014 FN6543.3 -Updated datasheet to Intersil new standard. -Added text in several places to clarify that VL can be connected to Vcc. -Ordering information table on page 3: Added MSL note. -Electrical spec table on page 6 under "Logic Input Current": Updated note reference. -Electrical spec table on page 7 under "Shutdown Supply Current": Updated note reference. -Electrical spec table on page 7 under "RECEIVER SWITCHING CHARACTERISTICS : Updated all the note references. -Updated POD P5.064 to new format: Moved dimensions from table onto drawing and added land pattern. -Updated POD P6.064 to new format: Same dimensions, added land pattern and moved dimensions from table onto drawing. - Updated POD L8.2X3A to new format: Added recommended land pattern. -Added revision history. About Intersil Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets. For the most updated datasheet, application notes, related documentation and related parts, please see the respective product information page found at www.intersil.com. You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask. Reliability reports are also available from our website at www.intersil.com/support For additional products, see www.intersil.com/en/products.html Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html 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. 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For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 13 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Package Outline Drawing P5.064 5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE Rev 3, 4/11 8° 0° 3.00 3 2.80 (1.90) 5 0.22 0.08 5 4 3.00 2.60 1.70 1.50 3 2 (0.95) SEE DETAIL X 0.50 0.30 0.20 (0.008) M C TOP VIEW END VIEW 0.25 0.10 0.10 MIN 1.30 0.90 1.45 SEATING 0.90 PLANE C GAUGE PLANE SEATING PLANE 4 0.55 0.35 C 0.15 0.00 0.10 (0.004) C (0.60) SIDE VIEW 8° 0° (0.25) DETAIL "X" 5x (0.60) 5x (1.2) 5 4 (2.4) NOTES: 1. Dimensioning and tolerance per ASME Y14.5M-1994. 3 2. Package conforms to EIAJ SC-74 and JEDEC MO178AA. 3. Package length and width are exclusive of mold flash, protrusions, or gate burrs. 4. Footlength measured at reference to gauge plane. 5. Lead thickness applies to the flat section of the lead between 0.08mm and 0.15mm from the lead tip. (2x 0.95) 6. Controlling dimension: MILLIMETER. Dimensions in ( ) for reference only. (1.90) TYPICAL RECOMMENDED LAND PATTERN Submit Document Feedback 14 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Package Outline Drawing P6.064 6 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE Rev 4, 2/10 0-8° 1.90 0.95 0.08-0.22 D A 6 5 4 2.80 PIN 1 INDEX AREA 1.60 +0.15/-0.10 3 3 (0.60) 1 2 3 0.20 C 2x 0.40 ±0.10 B SEE DETAIL X 3 0.20 M C A-B D END VIEW TOP VIEW 10° TYP (2 PLCS) 2.90 ±0.10 3 1.15 +0.15/-0.25 C 0.10 C SEATING PLANE 0.00-0.15 SIDE VIEW (0.25) GAUGE PLANE 1.45 MAX DETAIL "X" 0.45±0.1 4 (0.95) (0.60) (1.20) (2.40) NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to ASME Y14.5M-1994. 3. Dimension is exclusive of mold flash, protrusions or gate burrs. 4. Foot length is measured at reference to guage plane. 5. Package conforms to JEDEC MO-178AB. TYPICAL RECOMMENDED LAND PATTERN Submit Document Feedback 15 FN6543.4 July 27, 2015 ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E Package Outline Drawing L8.2x3A 8 LEAD THIN DUAL FLAT NO-LEAD PLASTIC PACKAGE WITH E-PAD Rev 2, 05/15 0.25 0.50 2.20 6 PIN 1 INDEX AREA (4X) 6 PIN #1 INDEX AREA B 3.00 A 1.80 +0.1/ -0.15 2.00 0.15 (8x0.40) 1.65 +0.1/ -0.15 TOP VIEW BOTTOM VIEW (8x0.25) PACKAGE OUTLINE (6x0.50) 0.75 SEE DETAIL "X" SIDE VIEW 1.80 3.00 0.05 (8x0.40) 1.65 C 0.20 REF C BASE PLANE SEATING PLANE 0.08 C 5 (8x0.20) 0.05 2.00 TYPICAL RECOMMENDED LAND PATTERN DETAIL "X" NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to ASME Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal ± 0.05 4. Dimension b applies to the metallized terminal and is measured between 0.20mm and 0.32mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature and may be located on any of the 4 sides (or ends). 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 indentifier may be either a mold or mark feature. Submit Document Feedback 16 FN6543.4 July 27, 2015