MAX3157CAI+T ,High CMRR RS-485 Transceiver with ±50V Isolationfeaturesindependently programmable receiver and transmitteroutput phase through separate pins. The ..
MAX3157EAI+ ,High CMRR RS-485 Transceiver with ±50V IsolationFeaturesThe MAX3157 is a high CMRR RS-485/RS-422 data-com-♦ ±50V Isolated Data Interfacemunications ..
MAX3157EAI+T ,High CMRR RS-485 Transceiver with ±50V IsolationMAX315719-1778; Rev 3; 11/01High CMRR RS-485 Transceiver with ±50V Isolation
MAX3158CAI+ ,High CMRR RS-485 Transceiver with ±60V IsolationApplications MAX3158EAI -40°C to +85°C 28 SSOPIndustrial Controls Telecommunications MAX3158EPI -40 ..
MAX3158EAI+ ,High CMRR RS-485 Transceiver with ±60V IsolationFeaturesThe MAX3158 is a high CMRR RS-485/RS-422 data-com-♦ ±60V Isolated Data Interfacemunications ..
MAX3160CAP ,+3.0V to +5.5V / 1A / RS-232/RS-485/422 Multiprotocol TransceiversFeaturesThe MAX3160/MAX3161/MAX3162 are programmable Single-Supply Operation from +3V to +5.5VRS-2 ..
MAX6386XS26D3 ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsFeaturesThe MAX6381–MAX6390 microprocessor (µP) supervisory ♦ Factory-Set Reset Threshold Voltages ..
MAX6386XS29D2-T ,SC70, Single/Dual Low-Voltage, Low-Power レP Reset CircuitsFeaturesThe MAX6381–MAX6390 microprocessor (µP) supervisory Factory-Set Reset Threshold Voltages R ..
MAX6386XS29D3+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381–MAX639019-1839; Rev 5; 7/12SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
MAX6386XS31D3 ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsELECTRICAL CHARACTERISTICS(V = full range, T = -40°C to +125°C, unless otherwise specified. Typical ..
MAX6387XS28D2+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsFeaturesThe MAX6381–MAX6390 microprocessor (µP) supervisory ♦ Factory-Set Reset Threshold Voltages ..
MAX6389XS31D1/V+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsApplications♦ Tiny 3-Pin/4-Pin SC70 and 6-Pin μ μDFN PackagesComputers Critical µP and µCOrdering I ..
MAX3157CAI+-MAX3157CAI+T-MAX3157EAI+-MAX3157EAI+T
High CMRR RS-485 Transceiver with ±50V Isolation
General DescriptionThe MAX3157 is a high CMRR RS-485/RS-422 data-com-
munications interface providing ±50V isolation in a
hybrid microcircuit. A single +5V supply on the logic side
powers both sides of the interface, with external ±50V
capacitors transferring power from the logic side to the
isolated side. Each MAX3157 contains one transmitter
and one receiver and is guaranteed to operate at data
rates up to 250kbps. Drivers are short-circuit current lim-
ited and protected against excessive power dissipation
by thermal shutdown circuitry that places the driver out-
puts into a high-impedance state. The receiver input has
a fail-safe feature that guarantees a logic high receiver
output if the inputs are open, shorted, or connected to a
terminated transmission line with all drivers disabled.
The MAX3157 typically draws 25mA of supply current
when unloaded or when fully loaded with the driver dis-
abled. Supply current drops to 25µA when the device is
placed in shutdown mode. The device is pin selectable
between half- and full-duplex mode and also features
independently programmable receiver and transmitter
output phase through separate pins. The MAX3157 is a
low-cost replacement for opto-isolated transceivers. For
fully isolated RS-485/RS-422 transceivers, refer to the
MAX1480 family data sheet.
________________________ApplicationsIndustrial Controls
Level Translators
Telecommunications
Local Area Networks
Features±50V Isolated Data Interface+5V Single SupplyLow-Cost Replacement for Opto-Isolated
TransceiversTrue Fail-Safe Receiver While Maintaining
EIA/TIA-485 CompliancePin-Selectable Full/Half-Duplex OperationPhase Controls to Correct for Twisted-Pair
Reversal25µA Low-Power Shutdown ModeThermal Shutdown for Driver Overload Protection28-Pin SSOP PackageSlew Rate Limited Reduced EMI
MAX3157
High CMRR RS-485 Transceiver
with ±50V IsolationMAX3157
C1HIC2LOC2HIC1LO
TXP
RXP
GND
MICRORT = 100Ω
VCC
0.1μF
1μF
10nF
0.047μF
0.047μF
±50V
GND OFFSET
ISOCOM
REMOTE GND
REMOTE MICRO
RS-485
NODE
VCC
H/F
ISOVCC
Typical Operating Circuit19-1778; Rev 3; 11/01
Ordering Information
Pin Configurations appear at end of data sheet.PART TEMP. RANGE PIN-PACKAGEMAX3157CAI 0°C to +70°C 28 SSOPMAX3157EAI -40°C to +85°C 28 SSOPMAX3157CPI 0°C to +70°C 28 PDIPMAX3157EPI -40°C to +85°C 28 PDIP
MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
ABSOLUTE MAXIMUM RATINGSAll voltages referenced to GND unless otherwise noted.
ELECTRICAL CHARACTERISTICS(VCC= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF, TA= TMINto TMAX, unless otherwise noted.
Typical values are at VCC = +5V and TA= +25°C.) (Note 1)
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.
Supply Voltage (VCC).............................................................+7V
Cable Ground (ISOCOM)....................................................±75V
Isolated Supply ISOVCC Relative to Cable Ground
(ISOCOM)............................................................................+7V
Digital Input, Output Voltage
(DI, DE, RE, TXP, RXP, RO)......................-0.3V to (VCC+ 0.3V)
Digital Inputs (H/F) Relative to Cable Ground
(ISOCOM)..........................................-0.3V to (ISOVCC+ 0.3V)
Driver Output Voltage (Y, Z), Relative to Cable Ground
(ISOCOM).............................................................-8V to +12.5V
Receiver Input Voltage (A, B), Relative to Cable Ground
(ISOCOM).............................................................-8V to +12.5V
Termination Connections (YR, ZR, AR, BR) Relative to Cable
Ground (ISOCOM)................................................-8V to +12.5V
Charge-Pump Capacitance Low
(C1LO, C2LO).......................................-0.3V to (VCC+ 0.3V)
Charge-Pump Capacitance High (C1HI, C2HI) Relative
to Cable Ground (ISOCOM)...........-0.3V to (ISOVCC + 0.3V)
Continuous Power Dissipation
28-Pin SSOP (derate 10.8mW/°C above +70°C)........860mW
28-Pin PDIP (derate 14.3mW/°C above +70°C)........1143mW
Operating Temperature Ranges
MAX3157C_I .....................................................0°C to +70°C
MAX3157E_I ..................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DRIVERDifferential Driver Output,
No LoadVOD1Figure 1, R = 10MΩ6V
Figure 1, R = 50Ω (RS-422)2.0Differential Driver Output,
LoadedVOD2Figure 1, R = 27Ω (RS-485)1.5V
Change in Magnitude of
Differential Output Voltage
(Note 2)
ΔVODFigure 1, R = 50Ω or R = 27Ω0.2V
Driver Common-Mode VoltageVOCFigure 1, R = 50Ω or R = 27Ω,
VOC relative to ISOCOM3.5V
Change in Magnitude of
Common-Mode Voltage
(Note 2)
ΔVOCFigure 1, R = 50Ω or R = 27Ω0.2V
Input High VoltageVIHDE, DI, RE, TXP, RXP, relative to GND,
H/F relative to ISOCOM2.0V
Input Low VoltageVILDE, DI, RE, TXP, RXP, relative to GND,
H/F relative to ISOCOM0.8V
DI Input HysteresisVHYS100mV
IIN1DE, DI, RE±2Input CurrentIIN2H/F, TXP, RXP internal pulldown1040µA
DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN -
VISOCOM) ≤ 12V, AR = BR = ISOCOM-5.08.0
Input Current (A and B)IIN3
DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN -
VISOCOM) ≤ 12V, AR open, BR open-0.581.0
MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
ELECTRICAL CHARACTERISTICS (continued)(VCC= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF, TA= TMINto TMAX, unless otherwise noted.
Typical values are at VCC = +5V and TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDE = GND, VCC = GND or 5.25V, -7V ≤ (VIN -
VISOCOM) ≤ 12V, YR = ZR = ISOCOM-5.08.0
Output Leakage (Y and Z)
Full DuplexIO
DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN -
VISOCOM) ≤ 12V, YR open, ZR open-0.581.0
IOSD1VISOCOM - 7V ≤ VOUT ≤ VISOVCC-250Driver Short-Circuit Output
Current (Note 3)IOSD2VISOCOM - 7V ≤ VOUT ≤ VISOCOM +12V250mA
RECEIVERReceiver Differential Threshold
VoltageVTH-7V ≤ VCM - VISOCOM ≤ 12V-200-125-50m V
Receiver Input HysteresisΔVTH25mV
Receiver Output High VoltageVOHIO = -4mA, VID = -50mVV CC - 1.5V
Receiver Output Low VoltageVOLIO = 4mA, VID = -200mV0.4V
Three-State Output Current at
ReceiverIOZR0.4V ≤ VO ≤ 2.4V±1µA
-7V ≤ VCM - VISOCOM ≤ 12V, AR = BR =
ISOCOM1.5
Receiver Input ResistanceRIN
-7V ≤ VCM - VISOCOM ≤ 12V, AR open,
BR open12
Receiver Output Short-Circuit
CurrentIOSR0V ≤ VRO ≤ VCC±7±100mA
SUPPLY CURRENTSupply CurrentICCNo load, RE = DE = DI = GND or VCC2585mA
DE = GND, RE = VCC, VISOCOM = GND2560Supply Current in Shutdown
ModeISHDNDE = GND, RE = VCC, VISOCOM = ±50V±600µA
Maximum Ground DifferentialΔVGNDDE = GND, RE = VCC,
| ISOCOM leakage | ≤ 600µA±50V
SWITCHING CHARACTERISTICS (VCC= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF. Typical values are at VCC= +5V and TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITStDPLHFigures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF40014002000
Driver Input to Output
tDPHLFigures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF40014002000
Driver Output Skew
| tDPLH - tDPHL |tDSKEWFigures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF250ns
Driver Rise or Fall TimetDR, tDFFigures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 =100pF20012002200ns
Maximum Data RatefMAX250kbps
MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
SWITCHING CHARACTERISTICS (continued)(VCC= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF. Typical values are at VCC= +5V and TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDriver Enable to Output HightDZHFigures 4 and 6, CL = 100pF, S2 closed3500ns
Driver Enable to Output LowtDZLFigures 4 and 6, CL = 100pF, S1 closed3500ns
Driver Disable Time from LowtDLZFigures 4 and 6, CL = 15pF, S1 closed300ns
Driver Disable Time from HightDHZFigures 4 and 6, CL = 15pF, S2 closed300ns
Receiver Input to OutputtRPLH,
tRPHLFigures 7 and 9; | VID | ≥ 2.0V440600ns
Differential Receiver Skew
|tRPLH - tRPHL|tRSKEWFigures 7 and 9; | VID | ≥ 2.0V20ns
Receiver Enable to Output LowtRZLFigures 2 and 8, CL = 100pF, S1 closed2050ns
Receiver Enable to Output HightRZHFigures 2 and 8, CL = 100pF, S2 closed2050ns
Receiver Disable Time from LowtRLZFigures 2 and 8, CL = 100pF, S1 closed200500ns
Receiver Disable Time from HightRHZFigures 2 and 8, CL = 100pF, S2 closed200500ns
Time to ShutdowntSHDN(Note 4)50200700ns
Driver Enable from Shutdown to
Output High
tDZH
(SHDN)Figures 4 and 6, CL = 15pF, S2 closed0.21ms
Driver Enable from Shutdown to
Output Low
tDZL
(SHDN)Figures 4 and 6, CL = 15pF, S1 closed0.21ms
Receiver Enable from Shutdown
to Output High
tRZH
(SHDN)Figures 2 and 8, CL = 100pF, S2 closed0.21m s
Receiver Enable from Shutdown
to Output Low
tRZL
(SHDN)Figures 2 and 8, CL = 100pF, S1 closed0.21ms
Charge-Pump Oscillating
FrequencyfOSC1.3MHz
Note 1:All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device
ground unless otherwise noted.
Note 2:ΔVODand ΔVOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 3:Current level applies to peak current just prior to foldback-current limiting.
Note 4:The device is put into shutdown by bringing REhigh and DE low. If the enable inputs are in this state for less than 50ns,
the device is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 700ns, the device is guaran-
teed to have entered shutdown.
MAX3157
High CMRR RS-485 Transceiver
with ±50V IsolationSUPPLY CURRENT vs. TEMPERATURE
MAX1357toc01
TEMPERATURE (°C)
SUPPY CURRENT (mA)
RL = 54Ω
NO LOAD
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX1357toc02
TEMPERATURE (°C)
SUPPY CURRENT (
VISOCOM = -50V
VISOCOM = 0
VISOCOM = +50V13456
RECEIVER OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGEMAX3157toc03
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)2.02.51.51.00.53.03.54.04.55.05.5
RECEIVER OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGEMAX3157toc04
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX3157toc05
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
IRO = 8mA
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX3157toc06
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
IRO = -8mA
DRIVER OUTPUT CURRENT
vs. DRIVER OUTPUT LOW VOLTAGE
MAX3157toc07
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
DRIVER OUTPUT CURRENT
vs. DRIVER OUTPUT HIGH VOLTAGE
MAX3157toc08
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX3157toc09
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT
CURRENT
Typical Operating Characteristics(VCC= +5V, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = 1µF, C4 = 10nF, TA= +25°C, unless otherwise noted.)
MAX3157
High CMRR RS-485 Transceiver
with ±50V IsolationDRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs. TEMPERATURE
MAX3157toc10
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
RL = 54Ω
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
MAX3157toc11
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
MAX3157toc12
TEMPERATURE (°C)
PROPAGATION DELAY (
RL = 54Ω
DRIVER ENABLE TIME
vs. TEMPERATURE
MAX3157toc13
TEMPERATURE (°C)
DRIVER ENABLE TIME (
DRIVER DISABLE TIME
vs. TEMPERATURE
MAX3157toc14
TEMPERATURE (°C)
DRIVER DISABLE TIME (ns)
VA - VB
5V/div
RECEIVER PROPAGATION DELAYMAX3157toc15
2μs/div
2V/div
VY - VZ
DRIVER PROPAGATION DELAYMAX3157toc16
2μs/div
RDIFF = 54Ω
CL1 = CL2 = 100pF
POWER-UP DELAY
(VISOCOM = 0)MAX3157toc17
40μs/div
10V/div
5V/div
5V/div
10V/div
100μs/div
-50V
POWER-UP DELAY
(VISOCOM = -50V)MAX3157toc18
Typical Operating Characteristics (continued)(VCC= +5V, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = 1µF, C4 = 10nF, TA= +25°C, unless otherwise noted.)
MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation5V/div
10V/div
100μs/div
+50V
POWER-UP DELAY
(VISOCOM = +50V)MAX3157toc19
MAXIMUM COMMON-MODE PEAK VOLTAGE TO
GROUND vs. COMMON-MODE FREQUENCY
MAX3157 toc20
COMMON-MODE FREQUENCY (kHz)
COMMON-MODE PEAK VOLTAGE TO GROUND (V)
MAXIMUM COMMON PEAK
VOLTAGE TO ISOCOM
COMMON-MODE VOLTAGE TO
ISOCOM = 7V PEAK
Typical Operating Characteristics (continued)(VCC= +5V, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = 1µF, C4 = 10nF, TA= +25°C, unless otherwise noted.)
Test Circuits and Timing DiagramsVOD
VOC
Figure 1. Driver DC Test Load
CL1
CL2
RDIFF
VID
Figure 3. Driver Timing Test Circuit
RECEIVER
OUTPUT
TEST POINT
1kΩ
1kΩ
VCC
100pF
OUTPUT
UNDER TEST
500ΩS1
VCC
Figure 2. Receiver Enable/Disable Timing Test LoadFigure 4. Driver Enable/Disable Timing Test Load
