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Part: MAX491EESD
Category:
Interface and Interconnect
-> Transceivers
Description: 15kv Esd-protected, Slew-rate-limited, Low-power, Rs-485/rs-422 Transceivers
Company: Maxim Integrated Products
Datasheet: Download MAX491EESD datasheet File size : 687 kB
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Datasheet text preview:
19-0410; Rev 3; 7/96
±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers
_______________General Description
The MAX481E, MAX483E, MAX485E, MAX487EMAX491E, and MAX1487E are low-power transceivers for RS-485 and RS-422 communications in harsh environments. Each driver output and receiver input is protected against ±15kV electrostatic discharge (ESD) shocks, without latchup. These parts c o n t a i n one driver and one receiver. The MAX483E, MAX487E, MAX488E, and MAX489E feature reduced slewrate 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 MAX481E, MAX485E, MAX490E, MAX491E, and MAX1487E are not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw as little as 120µA supply current when unloaded or when fully loaded with disabled drivers ( s e e Selection Table). Additionally, the MAX481E, MAX483E, and MAX487E have a low-current shutdown mode in which they consume only 0.5µA. 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 their outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. The MAX487E and MAX1487E feature quarter-unit-load receiver input impedance, allowing up to 128 transceivers on the bus. The MAX488EMAX491E are designed for fullduplex communications, while the MAX481E, MAX483E, MAX485E, MAX487E, and MAX1487E are designed for halfduplex applications. For applications that are not ESD sens i t i v e see the pin- and function-compatible MAX481, MAX483, MAX485, MAX487MAX491, and MAX1487.
____________________________Features
o ESD Protection: ±15kV--Human Body Model o Slew-Rate Limited for Error-Free Data Transmission (MAX483E/487E/488E/489E) o Low Quiescent Current: 120µA (MAX483E/487E/488E/489E) 230µA (MAX1487E) 300µA (MAX481E/485E/490E/491E) o -7V to +12V Common-Mode Input Voltage Range o Three-State Outputs o 30ns Propagation Delays, 5ns Skew (MAX481E/485E/490E/491E/1487E) o Full-Duplex and Half-Duplex Versions Available o Allows up to 128 Transceivers on the Bus (MAX487E/MAX1487E) o Current Limiting and Thermal Shutdown for Driver Overload Protection
MAX481E/MAX483E/MAX485E/MAX487EMAX491E/MAX1487E
______________Ordering Information
PART MAX481ECPA MAX481ECSA MAX481EEPA MAX481EESA TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO
________________________Applications
Low-Power RS-485 Transceivers Low-Power RS-422 Transceivers Level Translators Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks
Ordering Information continued on last page.
______________________________________________________________Selection Table
N PART UMBER MAX481E MAX483E MAX485E MAX487E MAX488E MAX489E MAX490E M AX491E AX1487E HDLF/FULL A UPLEX Half Half Half F alf Full Full Full Hull alf DATA RATE (Mbps) 0 .5 2 225 . 0 .5 0.25 0.25 225 . 2.5 2.5 .5 SLEW-RATE L IMITED Yo N Ns e Yo Yes Yes Ns e No No o LOW-POWER S HUTDOWN Yes Ns e Yo Ns e No No No No o RECEIVER/ D E RIVER NABLE Yes Yes Yes Ns e Yo Ns e Yo Yes es QUIESCENT C URRENT ( µA) 1 300 320 100 120 120 320 300 200 30 NUMBER OF TRAOSMITTERS N N BUS 32 32 12 38 2 32 32 32 12 28 C PIN OUNT 8 8 8 8 1 8 4 1 8 4
________________________________________________________________ Maxim Integrated Products
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±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers
MAX481E/MAX483E/MAX485E/MAX487EMAX491E/MAX1487E
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 (Y, Z; 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 Operating Temperature Ranges MAX4_ _C_ _/MAX1487EC_ A .....0°C to +70°C MAX4_ _E_ _/MAX1487EE_ A...-40°C to +85°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10sec) .....+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER Differential Driver Output (no load) Differential Driver Output (with load) Change in Magnitude of Driver Differential Output Voltage for Complementary Output States Driver Common-Mode Output Voltage Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States Input High Voltage Input Low Voltage Input Current SYMBOL VOD1 VOD2 VOD VOC VOD VIH VIL IIN1 R = 50 (RS-422) R = 27 (RS-485), Figure 8 R = 27 or 50, Figure 8 R = 27 or 50, Figure 8 R = 27 or 50, Figure 8 -- DE, DI, RE -- DE, DI, RE -- DE, DI, RE DE = 0V; VCC = 0V or 5.25V, all devices except MAX487E/MAX1487E MAX487E/MAX1487E, DE = 0V, VCC = 0V or 5.25V Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Output High Voltage Receiver Output Low Voltage Three-State (high impedance) Output Current at Receiver VTH VTH VOH VOL IOZR -7V VCM 12V VCM = 0V IO = -4mA, VID = 200mV IO = 4mA, VID = -200mV 0.4V VO 2.4V -7V VCM 12V, all devices except MAX487E/MAX1487E Receiver Input Resistance RIN -7V VCM 12V, MAX487E/MAX1487E 48 k 12 3.5 0.4 ±1 VIN = 12V VIN = -7V VIN = 12V VIN = -7V -0.2 70 2.0 0.8 ±2 1.0 mA -0.8 0.25 -0.2 0.2 mA V mV V V µA k 2 1.5 5 0.2 3 0.2 CONDITIONS MIN TYP MAX 5 UNITS V V
V V V V V µA
Input Current (A, B)
IIN2
2
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±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MAX488E/MAX489E, -- DE, DI, RE = 0V or VCC MAX490E/MAX491E, -- DE, DI, RE = 0V or VCC No-Load Supply Current (Note 3) ICC MAX481E/MAX485E, -- RE = 0V or VCC MAX1487E, -- RE = 0V or VCC MAX483E/MAX487E, -- RE = 0V or VCC Supply Current in Shutdown Driver Short-Circuit Current, VO = High Driver Short-Circuit Current, VO = Low Receiver Short-Circuit Current ESD Protection ISHDN IOSD1 IOSD2 IOSR DE = VCC DE = 0V DE = VCC DE = 0V DE = VCC MAX483E MAX487E MIN TYP 120 300 500 300 300 230 350 250 120 0.5 35 35 7 ±15 MAX 250 500 900 500 500 400 650 400 250 10 250 250 95 µA UNITS
MAX481E/MAX483E/MAX485E/MAX487EMAX491E/MAX1487E
DE = 0V -- MAX481E/483E/487E, DE = 0V, RE = VCC -7V VO 12V (Note 4) -7V VO 12V (Note 4) 0V VO VCC A, B, Y and Z pins, tested using Human Body Model
µA mA mA mA kV
SWITCHING CHARACTERISTICS--MAX481E/MAX485E, MAX490E/MAX491E, MAX1487E
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS Driver Input to Output Driver Output Skew to Output Driver Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Receiver Input to Output tPLH tPHL tSKEW tR, tF tZH tZL tLZ tHZ Figures 10 and 12, RDIFF = 54, CL1 = CL2 = 100pF Figures 10 and 12, RDIFF = 54, CL1 = CL2 = 100pF Figures 10 and 12, MAX481E, MAX485E, MAX1487E RDIFF = 54, CL1 = CL2 = 100pF MAX490EC/E, MAX491EC/E Figures 11 and 13, CL = 100pF, S2 closed Figures 11 and 13, CL = 100pF, S1 closed Figures 11 and 13, CL = 15pF, S1 closed Figures 11 and 13, CL = 15pF, S2 closed 20 20 3 5 MIN 10 10 TYP 40 40 5 20 20 45 45 45 45 60 60 5 20 20 20 20 2.5 50 200 50 50 50 50 600 MAX 60 60 10 40 ns 25 70 70 70 70 200 ns 150 ns ns ns ns ns Mbps ns ns ns ns ns UNITS ns ns
Figures 10 and 14, MAX481E, MAX485E, MAX1487E tPLH, tPHL RDIFF = 54, CL1 = CL2 = 100pF MAX490EC/E, MAX491EC/E tSKD tZL tZH tLZ tHZ fMAX tSHDN Figures 10 and 14, RDIFF = 54, CL1 = CL2 = 100pF Figures 9 and 15, CRL = 15pF, S1 closed Figures 9 and 15, CRL = 15pF, S2 closed Figures 9 and 15, CRL = 15pF, S1 closed Figures 9 and 15, CRL = 15pF, S2 closed MAX481E (Note 5)
| tPLH - tPHL | Differential Receiver Skew Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Maximum Data Rate Time to Shutdown
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