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MAX491ESD+T

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MAX491ESD+T

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Part Number MAX491ESD+T
Manufacturer Maxim Integrated
Description IC TXRX RS485/RS422 14-SOIC
Datasheet MAX491ESD+T Datasheet
Package 14-SOIC (0.154", 3.90mm Width)
In Stock 115,382 piece(s)
Unit Price $ 2.2522 *
Lead Time Can Ship Immediately
Estimated Delivery Time Jun 2 - Jun 7 (Choose Expedited Shipping)
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Part Number # MAX491ESD+T (Interface - Drivers, Receivers, Transceivers) is manufactured by Maxim Integrated and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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MAX491ESD+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - Interface - Drivers, Receivers, Transceivers
Datasheet MAX491ESD+TDatasheet
Package14-SOIC (0.154", 3.90mm Width)
Series-
TypeTransceiver
ProtocolRS422, RS485
Number of Drivers/Receivers1/1
DuplexFull
Receiver Hysteresis70mV
Data Rate2.5Mbps
Voltage - Supply4.75 V ~ 5.25 V
Operating Temperature-40°C ~ 85°C
Mounting TypeSurface Mount
Package / Case14-SOIC (0.154", 3.90mm Width)
Supplier Device Package14-SOIC

MAX491ESD+T Datasheet

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General Description The MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 are low-power transceivers for RS-485 and RS- 422 communication. Each part contains one driver and one receiver. The MAX483, MAX487, MAX488, and MAX489 feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, thus allowing error-free data transmission up to 250kbps. The driver slew rates of the MAX481, MAX485, MAX490, MAX491, and MAX1487 are not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw between 120µA and 500µA of supply current when unloaded or fully loaded with disabled drivers. Additionally, the MAX481, MAX483, and MAX487 have a low-current shutdown mode in which they consume only 0.1µA. All parts operate from a single 5V supply. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-imped- ance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 MAX487/ MAX1487 transceivers on the bus. Full-duplex communi- cations are obtained using the MAX488–MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are designed for half-duplex applications. ________________________Applications Low-Power RS-485 Transceivers Low-Power RS-422 Transceivers Level Translators Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks __Next Generation Device Features  For Fault-Tolerant Applications MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4 Unit Load, +3.3V, RS-485 Transceiver MAX3440E–MAX3444E: ±15kV ESD-Protected, ±60V Fault-Protected, 10Mbps, Fail-Safe, RS-485/J1708 Transceivers  For Space-Constrained Applications MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps, Profibus RS-485/RS-422 Transceivers MAX3362: +3.3V, High-Speed, RS-485/RS-422 Transceiver in a SOT23 Package MAX3280E–MAX3284E: ±15kV ESD-Protected, 52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422, True Fail-Safe Receivers MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V, SOT23, RS-485/RS-422 Transmitters  For Multiple Transceiver Applications MAX3030E–MAX3033E: ±15kV ESD-Protected, +3.3V, Quad RS-422 Transmitters  For Fail-Safe Applications MAX3080–MAX3089: Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers  For Low-Voltage Applications MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E: +3.3V Powered, ±15kV ESD-Protected, 12Mbps, Slew-Rate-Limited, True RS-485/RS-422 Transceivers MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. ______________________________________________________________Selection Table 19-0122; Rev 10; 9/14 PART NUMBER HALF/FULL DUPLEX DATA RATE (Mbps) SLEW-RATE LIMITED LOW- POWER SHUTDOWN RECEIVER/ DRIVER ENABLE QUIESCENT CURRENT (μA) NUMBER OF RECEIVERS ON BUS PIN COUNT MAX481 Half 2.5 No Yes Yes 300 32 8 MAX483 Half 0.25 Yes Yes Yes 120 32 8 MAX485 Half 2.5 No No Yes 300 32 8 MAX487 Half 0.25 Yes Yes Yes 120 128 8 MAX488 Full 0.25 Yes No No 120 32 8 MAX489 Full 0.25 Yes No Yes 120 32 14 MAX490 Full 2.5 No No No 300 32 8 MAX491 Full 2.5 No No Yes 300 32 14 MAX1487 Half 2.5 No No Yes 230 128 8 Ordering Information appears at end of data sheet.

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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers 2 Maxim Integrated MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC).............................................................12V Control Input Voltage (RE, DE)...................-0.5V to (VCC + 0.5V) Driver Input Voltage (DI).............................-0.5V to (VCC + 0.5V) Driver Output Voltage (A, B)...................................-8V to +12.5V Receiver Input Voltage (A, B).................................-8V to +12.5V Receiver Output Voltage (RO)....................-0.5V to (VCC + 0.5V) Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ....727mW 14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) ..800mW 8-Pin SO (derate 5.88mW/°C above +70°C).................471mW 14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............830mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW Operating Temperature Ranges MAX4_ _C_ _/MAX1487C_ A ...............................0°C to +70°C MAX4_ _E_ _/MAX1487E_ A.............................-40°C to +85°C MAX4_ _M_/MAX1487MJA .............................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C DC ELECTRICAL CHARACTERISTICS (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. V VIN = -7V VIN = 12V VIN = -7V VIN = 12V Input Current (A, B) IIN2 VTH kΩ48-7V ≤ VCM ≤ 12V, MAX487/MAX1487 RINReceiver Input Resistance -7V ≤ VCM ≤ 12V, all devices except MAX487/MAX1487 R = 27Ω (RS-485), Figure 4 0.4V ≤ VO ≤ 2.4V R = 50Ω (RS-422) IO = 4mA, VID = -200mV IO = -4mA, VID = 200mV VCM = 0V -7V ≤ VCM ≤ 12V DE, DI, RE DE, DI, RE MAX487/MAX1487, DE = 0V, VCC = 0V or 5.25V DE, DI, RE R = 27Ω or 50Ω, Figure 4 R = 27Ω or 50Ω, Figure 4 R = 27Ω or 50Ω, Figure 4 DE = 0V; VCC = 0V or 5.25V, all devices except MAX487/MAX1487 CONDITIONS kΩ12 µA±1IOZR Three-State (high impedance) Output Current at Receiver V 0.4VOLReceiver Output Low Voltage 3.5VOHReceiver Output High Voltage mV70ΔVTHReceiver Input Hysteresis V-0.2 0.2 Receiver Differential Threshold Voltage -0.2 mA 0.25 mA -0.8 1.0 1.5 5 VOD2 Differential Driver Output (with load) V 2 V5VOD1Differential Driver Output (no load) µA±2IIN1Input Current V0.8VILInput Low Voltage V2.0VIHInput High Voltage V0.2ΔVOD Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States V0.2ΔVOD Change in Magnitude of Driver Differential Output Voltage for Complementary Output States V3VOC Driver Common-Mode Output Voltage UNITSMIN TYP MAXSYMBOLPARAMETER

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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers Maxim Integrated 3 MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) DC ELECTRICAL CHARACTERISTICS (continued) (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) mA7 950V ≤ VO ≤ VCCIOSRReceiver Short-Circuit Current mA35 250-7V ≤ VO ≤12V (Note 4)IOSD2 Driver Short-Circuit Current, VO = Low mA35 250-7V ≤ VO ≤12V (Note 4)IOSD1 Driver Short-Circuit Current, VO = High MAX1487, RE = 0V or VCC 250 400 350 650 ns 10 30 60tPHL Driver Rise or Fall Time Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF ns MAX490M, MAX491M MAX490C/E, MAX491C/E 20 90 150 MAX481, MAX485, MAX1487 MAX490M, MAX491M MAX490C/E, MAX491C/E MAX481, MAX485, MAX1487 Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF MAX481 (Note 5) Figures 5 and 11, CRL = 15pF, S2 closed Figures 5 and 11, CRL = 15pF, S1 closed Figures 5 and 11, CRL = 15pF, S2 closed Figures 5 and 11, CRL = 15pF, S1 closed Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF CONDITIONS ns 5 10tSKEW ns50 200 600tSHDNTime to Shutdown Mbps2.5fMAXMaximum Data Rate ns20 50tHZReceiver Disable Time from High ns 10 30 60tPLH 20 50tLZReceiver Disable Time from Low ns20 50tZH Driver Input to Output Receiver Enable to Output High ns20 50tZLReceiver Enable to Output Low 20 90 200 ns ns 13 40 70tHZ tSKD Driver Disable Time from High | tPLH - tPHL | Differential Receiver Skew ns40 70tLZDriver Disable Time from Low ns 40 70tZLDriver Enable to Output Low 3 15 40 ns 5 15 25 ns 3 15 40 tR, tF 20 90 200 Driver Output Skew to Output tPLH, tPHLReceiver Input to Output 40 70tZHDriver Enable to Output High UNITSMIN TYP MAXSYMBOLPARAMETER CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER 230 400 300 500 MAX481/MAX485, RE = 0V or VCC 500 900 MAX490/MAX491, DE, DI, RE = 0V or VCC 300 500 MAX488/MAX489, DE, DI, RE = 0V or VCC 120 250 DE = VCC 300 500DE = 0V DE = VCC DE = 0V µAMAX481/483/487, DE = 0V, RE = VCC 0.1 10ISHDNSupply Current in Shutdown 120 250 ICC No-Load Supply Current (Note 3) DE = 5V DE = 0V MAX483 MAX487 MAX483/MAX487, RE = 0V or VCC Figures 7 and 9, CL = 100pF, S2 closed Figures 7 and 9, CL = 100pF, S1 closed Figures 7 and 9, CL = 15pF, S1 closed Figures 7 and 9, CL = 15pF, S2 closed µA

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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers 4 Maxim Integrated MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 SWITCHING CHARACTERISTICS—MAX483, MAX487/MAX488/MAX489 (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (continued) (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) 300 1000 Figures 7 and 9, CL = 100pF, S2 closed Figures 7 and 9, CL = 100pF, S1 closed Figures 5 and 11, CL = 15pF, S2 closed, A - B = 2V CONDITIONS ns40 100tZH(SHDN) Driver Enable from Shutdown to Output High (MAX481) ns Figures 5 and 11, CL = 15pF, S1 closed, B - A = 2V tZL(SHDN) Receiver Enable from Shutdown to Output Low (MAX481) ns40 100tZL(SHDN) Driver Enable from Shutdown to Output Low (MAX481) ns300 1000tZH(SHDN) Receiver Enable from Shutdown to Output High (MAX481) UNITSMIN TYP MAXSYMBOLPARAMETER tPLH tSKEW Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF tPHL Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Driver Input to Output Driver Output Skew to Output ns100 800 ns ns2000 MAX483/MAX487, Figures 7 and 9, CL = 100pF, S2 closed tZH(SHDN) Driver Enable from Shutdown to Output High 250 2000 ns2500 MAX483/MAX487, Figures 5 and 11, CL = 15pF, S1 closed tZL(SHDN) Receiver Enable from Shutdown to Output Low ns2500 MAX483/MAX487, Figures 5 and 11, CL = 15pF, S2 closed tZH(SHDN) Receiver Enable from Shutdown to Output High ns2000 MAX483/MAX487, Figures 7 and 9, CL = 100pF, S1 closed tZL(SHDN) Driver Enable from Shutdown to Output Low ns50 200 600MAX483/MAX487 (Note 5) tSHDNTime to Shutdown tPHL tPLH, tPHL < 50% of data period Figures 5 and 11, CRL = 15pF, S2 closed Figures 5 and 11, CRL = 15pF, S1 closed Figures 5 and 11, CRL = 15pF, S2 closed Figures 5 and 11, CRL = 15pF, S1 closed Figures 7 and 9, CL = 15pF, S2 closed Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 7 and 9, CL = 15pF, S1 closed Figures 7 and 9, CL = 100pF, S1 closed Figures 7 and 9, CL = 100pF, S2 closed CONDITIONS kbps250fMAX 250 800 2000 Maximum Data Rate ns20 50tHZReceiver Disable Time from High ns 250 800 2000 20 50tLZReceiver Disable Time from Low ns20 50tZHReceiver Enable to Output High ns20 50tZLReceiver Enable to Output Low ns ns 100 300 3000tHZ tSKD Driver Disable Time from High I tPLH - tPHL I Differential Receiver Skew Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF ns300 3000tLZDriver Disable Time from Low ns250 2000tZLDriver Enable to Output Low ns Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF ns250 2000tR, tF 250 2000 Driver Rise or Fall Time ns tPLH Receiver Input to Output 250 2000tZHDriver Enable to Output High UNITSMIN TYP MAXSYMBOLPARAMETER

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M A X 4 8 1 /M A X 4 8 3 /M A X 4 8 5 /M A X 4 8 7 – M A X 4 9 1 /M A X 1 4 8 7 30 0 0 2.5 OUTPUT CURRENT vs. RECEIVER OUTPUT LOW VOLTAGE 5 25 M A X 48 1- 01 OUTPUT LOW VOLTAGE (V) O U TP U T C U R R EN T (m A ) 1.5 15 10 0.5 1.0 2.0 20 35 40 45 0.9 0.1 -50 -25 25 75 RECEIVER OUTPUT LOW VOLTAGE vs. TEMPERATURE 0.3 0.7 TEMPERATURE (°C) O U TP U T LO W V O LT A G E (V ) 0 50 0.5 0.8 0.2 0.6 0.4 0 100 125 M A X 48 1- 04 IRO = 8mA -20 -4 1.5 2.0 3.0 5.0 OUTPUT CURRENT vs. RECEIVER OUTPUT HIGH VOLTAGE -8 -16 M A X 48 1- 02 OUTPUT HIGH VOLTAGE (V) O U TP U T C U R R EN T (m A ) 2.5 4.0 -12 -18 -6 -14 -10 -2 0 3.5 4.5 4.8 3.2 -50 -25 25 75 RECEIVER OUTPUT HIGH VOLTAGE vs. TEMPERATURE 3.6 4.4 TEMPERATURE (°C) O U TP U T H IG H V O LT A G E (V ) 0 50 4.0 4.6 3.4 4.2 3.8 3.0 100 125 M A X 48 1- 03 IRO = 8mA 90 0 0 1.0 3.0 4.5 DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE 10 70 M A X 48 1- 05 DIFFERENTIAL OUTPUT VOLTAGE (V) O U TP U T C U R R EN T (m A ) 2.0 4.0 50 30 80 60 40 20 0.5 1.5 2.5 3.5 2.3 1.5 -50 -25 25 125 DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE 1.7 2.1 M A X 48 1- 06 TEMPERATURE (°C) D IF FE R EN TI A L O U TP U T V O LT A G E (V ) 0 75 1.9 2.2 1.6 2.0 1.8 10050 2.4 R = 54Ω __________________________________________Typical Operating Characteristics (VCC = 5V, TA = +25°C, unless otherwise noted.) Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers Maxim Integrated 5 MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICS Note 1: 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. Note 2: All typical specifications are given for VCC = 5V and TA = +25°C. Note 3: Supply current specification is valid for loaded transmitters when DE = 0V. Note 4: Applies to peak current. See Typical Operating Characteristics. Note 5: The MAX481/MAX483/MAX487 are 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 (MAX481/MAX483/MAX487) section.

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M A X 4 8 1 /M A X 4 8 3 /M A X 4 8 5 /M A X 4 8 7 – M A X 4 9 1 /M A X 1 4 8 7 ____________________________Typical Operating Characteristics (continued) (VCC = 5V, TA = +25°C, unless otherwise noted.) 120 0 0 8 OUTPUT CURRENT vs. DRIVER OUTPUT LOW VOLTAGE 20 100 M A X 48 1- 07 OUTPUT LOW VOLTAGE (V) O U TP U T C U R R EN T (m A ) 6 60 40 2 4 80 10 12 140 -120 0 -7 -5 -1 5 OUTPUT CURRENT vs. DRIVER OUTPUT HIGH VOLTAGE -20 -80 M A X 48 1- 08 OUTPUT HIGH VOLTAGE (V) O U TP U T C U R R EN T (m A ) -3 1 -60 3-6 -4 -2 0 2 4 -100 -40 100 -40-60 -20 40 100 120 MAX1487 SUPPLY CURRENT vs. TEMPERATURE 300 M A X 48 1- 13 TEMPERATURE (°C) S U P P LY C U R R EN T (μ A ) 20 60 80 500 200 600 400 0 0 140 MAX1487; DE = VCC, RE = X MAX1487; DE = 0V, RE = X 100 -50 -25 50 100 MAX481/MAX485/MAX490/MAX491 SUPPLY CURRENT vs. TEMPERATURE 300 M A X 48 1- 11 TEMPERATURE (°C) S U P P LY C U R R EN T (μ A ) 25 75 500 200 600 400 0 0 125 MAX481/MAX485; DE = VCC, RE = X MAX481; DE = 0, RE = VCC MAX485; DE = 0, RE = X, MAX481; DE = RE = 0 MAX490/MAX491; DE = RE = X 100 -50 -25 50 100 MAX483/MAX487–MAX489 SUPPLY CURRENT vs. TEMPERATURE 300 M A X 48 1- 12 TEMPERATURE (°C) S U P P LY C U R R EN T (μ A ) 25 75 500 200 600 400 0 0 125 MAX483; DE = VCC, RE = X MAX487; DE = VCC, RE = X MAX483/MAX487; DE = 0, RE = VCC MAX483/MAX487; DE = RE = 0, MAX488/MAX489; DE = RE = X Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers 6 Maxim Integrated MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487

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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers Maxim Integrated 7 MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 ______________________________________________________________Pin Description MAX481 MAX483 MAX485 MAX487 MAX1487 TOP VIEW NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH. TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE. 1 2 3 4 8 5 VCC GND DI DE RE RO R D RtRt 7 6 D R DE RE DI ROA B 1 2 3 4 8 7 6 5 VCC B A GND DI DE RE RO DIP/SO R D 1 2 3 4 8 7 6 5 VCC A GND DERE B RO μMAX B A DI MAX481 MAX483 MAX485 MAX487 MAX1487 Figure 1. MAX481/MAX483/MAX485/MAX487/MAX1487 Pin Configuration and Typical Operating Circuit µMAX — — 5 6 7 8 — 2 — 1 3 — µMAX 4 5 6 7 — — 8 — 1 — 2 — DIP/SO DIP/SO 2 3 Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. 3 4 Driver Output Enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low. If the driver outputs are enabled, the parts function as line drivers. While they are high impedance, they function as line receivers if RE is low. DIP/SO — 4 5 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. 5 6, 7 Ground — 9 Noninverting Driver Output — 10 Inverting Driver Output — 3 4 6 — Noninverting Receiver Input and Noninverting Driver Output — 12 Noninverting Receiver Input 5 6 — 8 RE DE DI GND Y Z A A 7 — — B Inverting Receiver Input and Inverting Driver Output — 7 11 B Inverting Receiver Input 8 1 14 VCC Positive Supply: 4.75V ≤ VCC ≤ 5.25V — — 1, 8, 13 N.C. No Connect—not internally connected FUNCTIONNAME 431 2 Receiver Output: If A > B by 200mV, RO will be high; If A < B by 200mV, RO will be low. 2 RO PIN FUNCTIONNAME MAX481/MAX483/ MAX485/MAX487/ MAX1487 MAX488/ MAX490 MAX489/ MAX491

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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers 8 Maxim Integrated MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 __________Applications Information The MAX481/MAX483/MAX485/MAX487–MAX491 and MAX1487 are low-power transceivers for RS-485 and RS- 422 communications. The MAX481, MAX485, MAX490, MAX491, and MAX1487 can transmit and receive at data rates up to 2.5Mbps, while the MAX483, MAX487, MAX488, and MAX489 are specified for data rates up to 250kbps. The MAX488–MAX491 are full-duplex trans- ceivers while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are half-duplex. In addition, Driver Enable (DE) and Receiver Enable (RE) pins are included on the MAX481, MAX483, MAX485, MAX487, MAX489, MAX491, and MAX1487. When disabled, the driver and receiver outputs are high impedance. MAX487/MAX1487: 128 Transceivers on the Bus The 48kΩ, 1/4-unit-load receiver input impedance of the MAX487 and MAX1487 allows up to 128 transceivers on a bus, compared to the 1-unit load (12kΩ input impedance) of standard RS-485 drivers (32 trans- ceivers maximum). Any combination of MAX487/ MAX1487 and other RS-485 transceivers with a total of 32 unit loads or less can be put on the bus. The MAX481/MAX483/MAX485 and MAX488–MAX491 have standard 12kΩ Receiver Input impedance. MAX488 MAX490 TOP VIEW 1 2 3 4 RO DI GND 8 7 6 5 A B Z Y VCC DIP/SO R D Rt Rt VCC 5 6 7 8 RO DI GND 4 GND DI RO 3 2 A B Y Z VCC D R R D 1 3VCC 4RO 2A 1 6 5 7 8 GND DI Y ZB μMAX MAX488 MAX490 NOTE: TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE. MAX489 MAX491 DIP/SO TOP VIEW Rt Rt DE VCC RE GND VCC RE GND DE RO DI 9 10 12 11 B A Z Y 5 RO NC DI 2 1, 8, 13 3 6, 7 144 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC N.C. N.C. A B Z Y N.C. RO RE DE DI GND GND R D D R D R Figure 2. MAX488/MAX490 Pin Configuration and Typical Operating Circuit Figure 3. MAX489/MAX491 Pin Configuration and Typical Operating Circuit

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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers Maxim Integrated 9 MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 MAX483/MAX487/MAX488/MAX489: Reduced EMI and Reflections The MAX483 and MAX487–MAX489 are slew-rate limit- ed, minimizing EMI and reducing reflections caused by improperly terminated cables. Figure 12 shows the dri- ver output waveform and its Fourier analysis of a 150kHz signal transmitted by a MAX481, MAX485, MAX490, MAX491, or MAX1487. High-frequency har- monics with large amplitudes are evident. Figure 13 shows the same information displayed for a MAX483, MAX487, MAX488, or MAX489 transmitting under the same conditions. Figure 13’s high-frequency harmonics have much lower amplitudes, and the potential for EMI is significantly reduced. R R Y Z VOD VOC RECEIVER OUTPUT TEST POINT 1kΩ 1kΩ S1 S2 VCC CRL 15pF DI DE 3V Y Z CL1 CL2 A B RO RE RDIFF VID OUTPUT UNDER TEST 500Ω S1 S2 VCC CL _________________________________________________________________Test Circuits Figure 4. Driver DC Test Load Figure 5. Receiver Timing Test Load Figure 6. Driver/Receiver Timing Test Circuit Figure 7. Driver Timing Test Load

MAX491ESD+T Reviews

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The*****uerra

May 19, 2020

Perfect! Nice components, professional service!

Gra*****Huynh

May 16, 2020

Those components are in stock shipped fast and arrive promptly. Really Fast!

Mar***** Sha

May 4, 2020

I've made a few purchases from Heisener and always get a friendly technician helped me with locate what I was looking for. That kind of attitude is greatly appreciated.

Veda*****vedo

May 4, 2020

The helper is super handy, especially if you work with medium size PCB boards as it allows to hold the board steady in every position. It feels pretty sturdy and of good quality.

Amor*****rain

April 30, 2020

Best way to locate what I need, on a fast and efficient shipping! Keep up the good work!

Teag*****eber

April 29, 2020

All OK, fast delivery, good quality. Product works as it should, Nice Seller.

Gene*****Gaines

April 18, 2020

Every little component you can always find in here, and good suggestion for relative times too.

Gem*****Peck

April 16, 2020

Great item and excellent seller! Would highly recommend. Thank you. Trustworthy

Cre*****dom

April 9, 2020

Works just like the original one and even has the correct connectors installed.

Ace*****bbs

April 5, 2020

Awesome selection for all electronic parts here! Great service when it is needed too! Prices are competitive as well. Thank you!

MAX491ESD+T Guarantees

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We provide 90 days warranty.

If the items you received were not in perfect quality, we would be responsible for your refund or replacement, but the items must be returned in their original condition.

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hotAD637JDZ AD637JDZ Analog Devices Inc., IC RMS/DC CONV PRECISION 14-CDIP, 14-CDIP (0.300", 7.62mm), - View
KB15SKW01-5F05-JF KB15SKW01-5F05-JF NKK Switches, SWITCH PUSHBUTTON SPDT 1A 125V, -, - View
RWR74S2430FRBSL RWR74S2430FRBSL Vishay Dale, RES 243 OHM 5W 1% WW AXIAL, Axial, - View
RWR80S1100FRB12 RWR80S1100FRB12 Vishay Dale, RES 110 OHM 2W 1% WW AXIAL, Axial, - View
62061-2 62061-2 TE Connectivity AMP Connectors, CONN QC TAB 0.110 SOLDER, -, - View
0022154032 0022154032 Molex, LLC, KK 100 PCB ASSY RTAN 3POS TIN, -, - View
4-103323-0-33 4-103323-0-33 TE Connectivity AMP Connectors, CONN HEADR BRKWAY .100 33POS R/A, -, - View
VI-B5X-IY-F4 VI-B5X-IY-F4 Vicor Corporation, CONVERTER MOD DC/DC 5.2V 50W, Full Brick, - View
VI-24D-CY-S VI-24D-CY-S Vicor Corporation, CONVERTER MOD DC/DC 85V 50W, Full Brick, - View
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MAX491ESD+T

Certified Quality

Heisener's commitment to quality has shaped our processes for sourcing, testing, shipping, and every step in between. This foundation underlies each component we sell.

ISO9001:2015, ICAS, IAF, UKAS

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