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19-4322; Rev 1; 5/09
RS-485 Transceivers with Low-Voltage Logic Interface
General Description
The MAX13430E-MAX13433E are full- and half-duplex RS-485 transceivers that feature an adjustable low-voltage logic interface for operation in multivoltage systems. This allows direct interfacing to low-voltage ASIC/FPGAs without extra components. The MAX13430E-MAX13433E RS-485 transceivers operate with a VCC voltage supply from +3V to +5V. The low-voltage logic interface operates with a voltage supply from +1.62V to VCC. The MAX13430E/MAX13432E feature reduced slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. The MAX13431E/MAX13433E driver slew rates are not limited, enabling data transmission up to 16Mbps. The MAX13430E/MAX13431E are intended for half-duplex communications, and the MAX13432E/MAX13433E are intended for full-duplex communications. The MAX13430E/MAX13431E are available in 10-pin MAX(R) and 10-pin TDFN packages. The MAX13432E/ MAX13433E are available in 14-pin TDFN and 14-pin SO packages. o Wide +3V to +5V Input Supply Range o Low-Voltage Logic Interface +1.62V (min) o Ultra-Low Supply Current in Shutdown Mode 10A ICC (max), 1A IL (max) o Thermal Shutdown Protection o Hot-Swap Input Structures on DE and RE o 1/8-Unit Load Allows Up to 256 Transceivers on the Bus o Enhanced Slew-Rate Limiting (MAX13430E/MAX13432E) o Extended ESD Protection for RS-485 I/O Pins 30kV Human Body Model 15kV Air-Gap Discharge per IEC 61000-4-2 10kV Contact Discharge per IEC 61000-4-2 o Extended -40C to +85C Operating Temperature Range o Space-Saving TDFN and MAX Packages
Pin Configurations and Functional Diagrams appear at end of data sheet.
Features
MAX13430E-MAX13433E
Applications
Industrial Control Systems Portable Industrial Equipment
FULL/HALF DUPLEX Half Half Half Half Full Full Full Full
Motor Control HVAC
Ordering Information/Selector Guide
PIN-PACKAGE DATA RATE SLEW RATE (Mbps) LIMITED 0.5 0.5 16 16 0.5 0.5 16 16 Yes Yes No No Yes Yes No No TRANSCEIVERS ON BUS 256 256 256 256 256 256 256 256 TOP MARK AUS -- AUT -- -- AEG -- AEH PACKAGE CODE T1033-1 U10-2 T1033-1 U10-2 S14-1 T1433-2 S14-1 T1433-2
PART MAX13430EETB+ MAX13430EEUB+ MAX13431EETB+ MAX13431EEUB+ MAX13432EESD+ MAX13432EETD+ MAX13433EESD+ MAX13433EETD+
10 TDFN-EP* (3mm x 3mm) 10 MAX (3mm x 3mm) 10 TDFN-EP* (3mm x 3mm) 10 MAX (3mm x 3mm) 14 SO 14 TDFN-EP* (3mm x 3mm) 14 SO 14 TDFN-EP* (3mm x 3mm)
Note: All devices are specified over the extended -40C to +85C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. MAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.) Supply Voltage (VCC) ...............................................-0.3V to +6V Logic Supply Voltage (VL ) ......................................-0.3V to +6V Control Input Voltage (RE) .............................-0.3V to (VL+0.3V) Control Input Voltage (DE) ......................................-0.3V to +6V Driver Input Voltage (DI) ..........................................-0.3V to +6V Driver Output Voltage (Y, Z, A, B) ............................-8V to +13V Receiver Input Voltage (A, B) (MAX13430E/MAX13431E)....................................-8V to +13V Receiver Input Voltage (A, B) (MAX13432E/MAX13433E)..................................-25V to +25V Receiver Output Voltage (RO) .....................-0.3V to (VL + 0.3V) Driver Output Current ....................................................250mA Short-Circuit Duration (RO, A, B) to GND .................Continuous Power Dissipation (TA = +70C) 10-Pin MAX (derate 8.8mW/C above +70C) ..........707mW 10-Pin TDFN (derate 24.4mW/C above +70C) ......1951mW 14-Pin TDFN (derate 24.4mW/C above +70C) ......1951mW 14-Pin SO (derate 11.9mW/C above +70C) .............952mW Junction-to-Ambient Thermal Resistance (JA) (Note 1) 10-Pin MAX ...........................................................113.1C/W 10-Pin TDFN .................................................................41C/W 14-Pin TDFN ................................................................41C/W 14-Pin SO ....................................................................84C/W Junction-to-Ambient Thermal Resistance (JC) (Note 1) 10-Pin MAX ................................................................42C/W 10-Pin TDFN ...................................................................9C/W 14-Pin TDFN ..................................................................8C/W 14-Pin SO ....................................................................34C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature ..................................................... +150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to http://www.maxim-ic.com/thermal-tutorial.
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 = +3V to +5.5V, VL = +1.8V to VCC, TA = -40C to +85C, unless otherwise noted. Typical values are VCC = +5V, VL = +1.8V at TA = +25C.) (Notes 2, 3)
PARAMETER POWER SUPPLY VCC Supply-Voltage Range VL Supply-Voltage Range ICC Supply Current ICC Supply Current in Shutdown Mode VL Supply Current DRIVER RL = 100, VCC = +3V Differential Driver Output (Figure 1) VOD RL = 54, VCC = +3V RL = 100, VCC = +4.5V RL = 54, VCC = +4.5V Change in Magnitude of Differential Output Voltage Driver Common-Mode Output Voltage Change in Magnitude of Common-Mode Voltage VOD VOC VOC RL = 100 or 54, Figure 1 (Note 4) RL = 100 or 54, Figure 1 RL = 100 or 54, Figure 1 (Note 4) VCC/2 2 1.5 2.25 2.25 VCC VCC VCC VCC 0.2 3 0.2 V V V V VCC VL ICC DE = RE = high, no load DE = RE = low, no load DE = high, RE = low, no load DE = low, RE = high, no load RO = no load 3 1.62 5.5 VCC 2 V V mA SYMBOL CONDITIONS MIN TYP MAX UNITS
ISHDN IL
10 1
A A
2
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RS-485 Transceivers with Low-Voltage Logic Interface
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, VL = +1.8V to VCC, TA = -40C to +85C, unless otherwise noted. Typical values are VCC = +5V, VL = +1.8V at TA = +25C.) (Notes 2, 3)
PARAMETER Output Leakage Current (Y and Z) Driver Short-Circuit Output Current (Note 5) Driver Short-Circuit Output Foldback Current (Note 5) Thermal Shutdown Threshold Thermal Shutdown Hysteresis RECEIVER Input Current (A and B) Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Input Resistance LOGIC INTERFACE Input High Logic Level (DI, DE, RE) Input Low Logic Level (DI, DE, RE) Input Current (DI, DE, RE) Input Impedance on First Transition Output High Logic Level (RO) Output Low Logic Level (RO) Receiver Three-State Output Current (RO) Receiver Output Short-Circuit Current (RO) ESD PROTECTION IEC 61000-4-2 Air Gap Discharge A, B, Y, Z to GND All Other Pins (Except A, B, Y, and Z) IEC 61000-4-2 Contact Discharge Human Body Model Human Body Model 15 10 30 2 kV kV VIH VIL IIN RDE, RE VOH VOL IOZR IOSR IO = -1mA, VA - VB = VTH IO = 1mA, VA - VB = -VTH 0 VRO VL 0 VRO VL -1 -110 0.01 VDI = VDE = VRE = VL = +5.5V 1 VL - 0.4 0.4 +1 +110 2/3 x VL 1/3 x VL 1 10 V V A k V V A mA IA, B VTH VTH RIN DE = GND, VCC = VGND or +5.5V -7V VCM +12V VCM = 0 -7V VCM +12V 96 VCM = +12V VCM = -7V -100 -200 15 -50 125 A mV mV k SYMBOL IOLK IOSD IOSDF TTS TTSH CONDITIONS DE = GND, VCC = VGND or +5.5V 0 VOUT +12V -7V VOUT VCC (VCC - 1V) VOUT +12V -7V VOUT +1V +150 15 -250 15 -15 VIN = +12V VIN = -7V -100 +250 MIN TYP MAX 125 UNITS A mA mA C C
MAX13430E-MAX13433E
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3
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
SWITCHING CHARACTERISTICS (MAX13431E/MAX13433E (16 Mbps))
(VCC = +3V to +5.5V, VL = +1.8V to VCC, TA = -40C to +85C, unless otherwise noted. Typical values are VCC = +5V, VL = +1.8V at TA = +25C.) (Notes 2, 3)
PARAMETER DRIVER Driver Propagation Delay (Figures 2 and 3) Driver Differential Output Rise or Fall Time Differential Driver Output Skew |tDPLH - tDPHL| Maximum Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low RECEIVER Receiver Propagation Delay (Figures 6 and 7) Receiver Output Skew Maximum Data Rate Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low DRIVER/RECEIVER Time to Shutdown tSHDN 50 340 700 ns tRZL tRZH tRLZ tRHZ Figure 8 Figure 8 Figure 8 Figure 8 tRPLH tRPHL tRSKEW CL = 15pF CL = 15pF, Figures 6 and 7 16 50 50 50 50 5 5 80 80 13 ns ns Mbps ns ns ns ns s s tDZH tDZL tDLZ tDHZ CL = 50pF, RL = 500, Figure 4 CL = 50pF, RL = 500, Figure 5 CL = 50pF, RL = 500, Figure 4 CL = 50pF, RL = 500, Figure 5 tDPLH tDPHL tR, tF tDSKEW CL = 50pF, RDIFF = 54 CL = 50pF, RL = 54, Figures 2 and 3 CL = 50pF, RL = 54, Figures 2 and 3 16 150 150 100 120 5 5 50 50 15 8 ns ns ns Mbps ns ns ns ns s s SYMBOL CONDITIONS MIN TYP MAX UNITS
tDZH(SHDN) CL = 50pF, RL = 500, Figure 4 tDZL(SHDN) CL = 50pF, RL = 500, Figure 5
tRZH(SHDN) Figure 8 tRZL(SHDN) Figure 8
4
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RS-485 Transceivers with Low-Voltage Logic Interface
DRIVER SWITCHING CHARACTERISTICS (MAX13430E/MAX13432E (500 kbps))
(VCC = +3V to +5.5V, VL = +1.8V to VCC, TA = -40C to +85C, unless otherwise noted. Typical values are VCC = +5V, VL = +1.8V at TA = +25C.) (Notes 2, 3)
PARAMETER DRIVER Driver Propagation Delay (Figures 2 and 3) Driver Differential Output Rise or Fall Time Differential Driver Output Skew |tDPLH - tDPHL| Maximum Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low RECEIVER Receiver Propagation Delay (Figures 6 and 7) Receiver Output Skew Maximum Data Rate Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low tRZL tRZH tRLZ tRHZ Figure 8 Figure 8 Figure 8 Figure 8 tRPLH tRPHL tRSKEW CL = 15pF CL = 15pF, Figures 6 and 7 500 50 50 50 50 5 5 200 200 30 ns ns kbps ns ns ns ns s s tDZH tDZL tDLZ tDHZ CL = 50pF, RL = 500, Figure 4 CL = 50pF, RL = 500, Figure 5 CL = 50pF, RL = 500, Figure 4 CL = 50pF, RL = 500, Figure 5 tDPLH tDPHL tR, tF tDSKEW CL = 50pF, RL = 54 CL = 50pF, RL = 54, Figures 2 and 3 CL = 50pF, RL = 54, Figures 2 and 3 500 2.5 2.5 100 120 5 5 180 180 200 800 800 800 100 ns ns ns kbps s s ns ns s s SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX13430E-MAX13433E
tDZH(SHDN) CL = 50pF, RL = 500, Figure 4 tDZL(SHDN) CL = 50pF, RL = 500, Figure 5
tRZH(SHDN) Figure 8 tRZL(SHDN) Figure 8
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5
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
DRIVER SWITCHING CHARACTERISTICS (MAX13430E/MAX13432E (500 kbps)) (continued)
(VCC = +3V to +5.5V, VL = +1.8V to VCC, TA = -40C to +85C, unless otherwise noted. Typical values are VCC = +5V, VL = +1.8V at TA = +25C.) (Notes 2, 3)
PARAMETER DRIVER/RECEIVER Time to Shutdown tSHDN 50 340 700 ns SYMBOL CONDITIONS MIN TYP MAX UNITS
Note 2: Parameters are 100% production tested at TA = +25C, unless otherwise noted. Limits over temperature are guaranteed by design. Note 3: All currents into the device are positive. All currents out of the device are negative. All voltages are referenced to device ground, unless otherwise noted. Note 4: VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 5: The short-circuit output current is the peak current just prior to current limiting; the short-circuit foldback output current applies during current limiting to allow a recovery from bus contention.
Typical Operating Characteriststics
(VCC = +5V, VL = +5V, TA = +25C, unless otherwise noted.)
OUTPUT CURRENT vs. RECEIVER OUTPUT-HIGH VOLTAGE
60 OUTPUT CURRENT FOR VL = 5V (mA) 50 40 30 20 10 0 -40 -15 10 35 60 85 0 1 2 3 4 5 TEMPERATURE (C) OUTPUT-HIGH VOLTAGE, VOH (V) VL = 1.8V VL = 5V
MAX13430E-3E toc02
VCC SUPPLY CURRENT vs. TEMPERATURE
MAX13430E-3E toc01
OUTPUT CURRENT vs. RECEIVER OUTPUT-LOW VOLTAGE
6 OUTPUT CURRENT FOR VL = 1.8V (mA) 5 4 3 2 1 0 OUTPUT CURRENT FOR VL = 5V (mA) 80
MAX13430E-3E toc03
100 DE = HIGH, MAX13432E DE = HIGH, MAX13433E 10 DE = LOW, MAX13433E 1 VL = 5V RDIFF = 54 DI = RE =LOW 0 DE = LOW, MAX13432E
8 OUTPUT CURRENT FOR VL = 1.8V (mA)
VCC SUPPLY CURRENT (mA)
60
VL = 1.8V VL = 5V
6
40
4
20
2
0 0 1 2 3 4 5 OUTPUT-LOW VOLTAGE, VOL (V)
0
RECEIVER OUTPUT-HIGH VOLTAGE vs. TEMPERATURE
OUTPUT-LOW VOLTAGE FOR VL = 1.8V, VOH (V) OUTPUT-HIGH VOLTAGE FOR VL = 5V, VOH (V) 6.0 IO = 1mA 5.5 VL = 5V 5.0 VL = 1.8V 4.5 1.7 1.8 1.9
MAX13430E-3E toc04
RECEIVER OUTPUT-LOW VOLTAGE vs. TEMPERATURE
MAX13430E-3E toc05
DIFFERENTIAL OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE
VL = 5V 120 OUTPUT CURRENT (mA) 100 80 60 40 20
MAX13430E-3E toc06
2.0
0.5 IO = 1mA OUTPUT-LOW VOLTAGE, VOL (V) 0.4
140
0.3
0.2 VL = 5V 0.1 VL = 1.8V
4.0 -40 -15 10 35 60 85 TEMPERATURE (C)
1.6
0 -40 -15 10 35 60 85 TEMPERATURE (C)
0 0 1 2 3 4 5 OUTPUT VOLTAGE (V)
6
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RS-485 Transceivers with Low-Voltage Logic Interface
Typical Operating Characteristics (continued)
(VCC = +5V, VL = +5V, TA = +25C, unless otherwise noted.)
MAX13430E-MAX13433E
DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE
MAX13430E-3E toc07
OUTPUT CURRENT vs. TRANSMITTER OUTPUT-HIGH VOLTAGE
MAX13430E-3E toc08
OUTPUT CURRENT vs. TRANSMITTER OUTPUT-LOW VOLTAGE
VL = 5V 140 OUTPUT CURRENT (mA) 120 100 80 60 40 20 0
MAX13430E-3E toc09
4.0 DIFFERENTIAL OUTPUT VOLTAGE, VOD (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 -15 10 35 60 RDIFF = 54 VL = 5V
140 VL = 5V 120 OUTPUT CURRENT (mA) 100 80 60 40 20 0
160
85
-7 -6 -5 -4 -3 -2 -1 0
1
2
3
4
5
0
2
4
6
8
10
12
TEMPERATURE (C)
OUTPUT-HIGH VOLTAGE (V)
OUTPUT-LOW VOLTAGE (V)
SHUTDOWN CURRENT vs. TEMPERATURE
MAX13430E-3E toc10
DRIVER PROPAGATION vs. TEMPERATURE (MAX13432E)
MAX13430E-3E toc11
DRIVER PROPAGATION vs. TEMPERATURE (MAX13433E)
VL = 5V DRIVER PROPAGATION DELAY (ns) 70 60 50 40 30 20 10 0 tRPHL tRPLH -40 -15 10 35 60 85
MAX13430E-3E toc12
10 9 SHUTDOWN CURRENT (A) 8 7 6 5 4 3 2 1 0 -40 -15 10 35 60 IL ICC VL = 5V
600 VL = 5V DRIVER PROPAGATION DELAY (ns) 500 400 300 200 100 0 tRLPH tRLPL
80
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
RECEIVER PROPAGATION vs. TEMPERATURE
VL = 1.8V RECEIVER PROPAGATION DELAY (ns) 45
MAX13430E-3E toc13
MAX13432E DRIVER PROPAGATION DELAY (500kbps)
MAX13430E-3E toc14
MAX13433E DRIVER PROPAGATION DELAY (20Mbps)
MAX13430E-3E toc15
60 tRPHL tRPLH
VL = 5V RL = 54
VL = 5V RL = 54
DI 2V/div
30
VZ 2V/div VY 2V/div
15
0 -40 -15 10 35 60 85 10ns/div 10ns/div TEMPERATURE (C)
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7
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
Test Circuits and Waveforms
Y RL/2 VOD RL/2 Z VOC DI DE Y D Z VOD RL CL VL
Figure 1. Driver DC Test Load
Figure 2. Driver Timing Test Circuit
VL DI 0 VL/2 tDPLH tDPHL 1/2 VO
Z VO Y 1/2 VO VO VDIFF 0 -VO VDIFF = V (Y) - V (Z) 10% tR tSKEW = | tDPLH - tDPHL | 90% tF 90% 10%
Figure 3. Driver Propagation Delays
8
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RS-485 Transceivers with Low-Voltage Logic Interface
Test Circuits and Waveforms (continued)
Y 0 OR VL D Z DE GENERATOR 50 CL 50pF S1 OUT RL = 500
MAX13430E-MAX13433E
VL DE tDZH, tDZH(SHDN) VL/2 0 0.25V OUT VOM = (0 + VOH)/2 tDHZ 0
VOH
Figure 4. Driver Enable and Disable Times (tDHZ, tDZH, and tDZHZ(SHDN))
VCC RL = 500 S1 OUT Z DE GENERATOR 50 CL 50pF
Y 0 OR VL D
VL DE tDZL, tDZL(SHDN) VL/2 0
tDLZ VCC OUT VOL VOM = (VOL + VCC)/2 0.25V
Figure 5. Driver Enable and Disable Times (tDZL, tDLZ, and tDLZ(SHDN))
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RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
Test Circuits and Waveforms (continued)
A B ATE VID A RO R RECEIVER OUTPUT B VOH VOL VL/2 tRPLH tRPHL +1V -1V
THE RISE TIME AND FALL TIME OF INPUTS A AND B < 4ns
Figure 6. Receiver Propagation Delay Test Circuit
Figure 7. Receiver Propagation Delays
S1
+1.5V -1.5V
S3 VID R R RO 1k VL
RE
CL 15pF
S2
GENERATOR
50
S1 OPEN S2 CLOSED S3 = +1.5V VL
S1 CLOSED S2 OPEN S3 = -1.5V VL VL/2 RE tRZL, tRZL(SHDN)
RE tRZH, tRZH(SHDN) RO VOH/2
0
0
VOH (VOL + VL)/2 0 S1 OPEN S2 CLOSED S3 = +1.5V VL/2 tRHZ 0 RE tRLZ VOH 0.25V RO S1 CLOSED S2 OPEN S3 = -1.5V VL/2
VL
VOL
VL
VL
RE
0
VL
RO 0 RO 0.25V VOL
Figure 8. Receiver Enable and Disable Times
10 ______________________________________________________________________________________
RS-485 Transceivers with Low-Voltage Logic Interface
Pin Description
PIN MAX13430E/MAX13431E MAX 1 2 TDFN 1 2 VL RO VL Input Logic-Supply Voltage. Bypass VL with a 0.1F ceramic capacitor located as close as possible to the input. Receiver Output. When RE is low and if (A - B) -50mV, RO is high; if (A - B) -200mV, RO is low. Driver Output Enable. Drive DE high to enable driver outputs. These outputs are high impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode. DE is a hot-swap input (see the Hot-Swap Capability section for details.) Active-Low Receiver Output Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode. RE is a hot-swap input (see the Hot-Swap Capability section for details.) Driver Input. With DE high, a low on DI forces noninverting output low and inverting output high. Similarly, a high on DI forces noninverting output high and inverting output low. Ground No Connection. Not internally connected. N.C. can be connected to GND. Noninverting Receiver Input and Noninverting Driver Output Inverting Receiver Input and Inverting Driver Output VCC Input Supply Voltage. Bypass VCC with a 1F ceramic capacitor located as close as possible to the input for full ESD protection. If full ESD protection is not required, bypass VCC with a 0.1F ceramic capacitor. Exposed Pad (TDFN Only). Connect EP to GND. NAME FUNCTION
MAX13430E-MAX13433E
3
3
DE
4
4
RE
5 6 7 8 9 10 --
5 6 7 8 9 10 --
DI GND N.C. A B VCC EP
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11
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
Pin Description (continued)
PIN MAX13432E/MAX13433E SO 1 2 TDFN 1 2 VL RO VL Input Logic Supply Voltage. Bypass VL with a 0.1F ceramic capacitor located as close as possible to the input. Receiver Output. When RE is low and if (A - B) -50mV, RO is high; if (A - B) -200mV, RO is low. Driver Output Enable. Drive DE high to enable driver outputs. These outputs are high impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode. DE is a hot-swap input (see the Hot-Swap Capability section for details.) Active-Low Receiver Output Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode. RE is a hot-swap input (see the Hot-Swap Capability section for details.) Driver Input. With DE high, a low on DI forces noninverting output low and inverting output high. Similarly, a high on DI forces noninverting output high and inverting output low. Ground No Connection. Not internally connected. N.C. can be connected to GND. Ground Noninverting Driver Output Inverting Driver Output Inverting Receiver Input Noninverting Receiver Input VCC Input Supply Voltage. Bypass VCC with a 1F ceramic capacitor located as close as possible to the input for full ESD protection. If full ESD protection is not required, bypass VCC with a 0.1F ceramic capacitor. Exposed Pad (TDFN Only). Connect EP to GND. NAME FUNCTION
3
3
DE
4
4
RE
5 6 7, 13 8 9 10 11 12 14 --
5 6 7, 13 8 9 10 11 12 14 --
DI GND N.C. GND Y Z B A VCC EP
12
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RS-485 Transceivers with Low-Voltage Logic Interface
Function Tables
MAX13430E/MAX13431E (Full Duplex)
TRANSMITTING INPUTS RE X X 0 1 DE 1 1 0 0 DI 1 0 X X RECEIVING INPUTS RE 0 0 0 1 1 DE X X X 1 0 A-B -50mV -200mV Open/ Shorted X X OUTPUT RO 1 0 1 High-Impedance Shutdown RE 0 0 0 1 1 INPUTS DE X X X 1 0 A-B -50mV -200mV Open/ Shorted X X Z 0 1 HighImpedance OUTPUTS Y 1 0 HighImpedance RE X X 1 0 INPUTS DE 1 1 0 0 DI 1 0 X X RECEIVING OUTPUT RO 1 0 1 High-Impedance Shutdown* B 0 1 HighImpedance
MAX13430E-MAX13433E
MAX13432E/MAX13433E (Half Duplex)
TRANSMITTING OUTPUTS A 1 0 HighImpedance
Shutdown
Shutdown*
X = Don't care. *Shutdown mode, driver and receiver outputs are in high impedance.
Functional Diagrams
VL VCC VL VCC
MAX13430E MAX13431E
MAX13432E MAX13433E
Z
DI
D
DI
D
Y
DE
B
DE
RE
A
RE
RO
R
RO
R
B A
GND
GND
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13
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
Detailed Description
The MAX13430E-MAX13433E are full- and half-duplex RS-485 transceivers that feature an adjustable lowvoltage logic interface for application in multivoltage systems. This allows direct interfacing to lowvoltage ASIC/FPGAs without extra components. The MAX13430E-MAX13433E RS-485 transceivers operate with a VCC voltage supply from +3V to +5V. The lowvoltage logic interface operates with a voltage supply from +1.62V to VCC. The MAX13430E-MAX13433E are 30kV ESD-protected RS-485 transceivers with one driver and one receiver. All devices have a 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. These devices include fail-safe circuitry, guaranteeing a logic-high receiver output when receiver inputs are open or shorted. The receivers output a logic-high if all transmitters on a terminated bus are disabled (high impedance). All devices feature hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion. The MAX13430E/MAX13432E feature reduced slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. The MAX13431E/MAX13433E driver slew rates are not limited, enabling data transmission up to 16Mbps. The MAX13430E-MAX13433E transceivers draw 2mA of supply current when unloaded or when fully loaded with the drivers disabled. The MAX13430E/ MAX13431E are intended for half-duplex communications, and the MAX13432E/MAX13433E are intended for full-duplex communications. If (A - B) is less than or equal to -200mV, RO is logiclow. In the case of a terminated bus with all transmitters disabled, the receiver's differential input voltage is pulled to 0V by the termination. With the receiver thresholds of the MAX13430E family, this results in a logic-high with a 50mV minimum noise margin. The -50mV to -200mV threshold complies with the 200mV EIA/TIA/RS-485 standard.
Hot-Swap Capability
When circuit boards are inserted into a hot or powered backplane, differential disturbances to the data bus can lead to data errors. Upon initial circuit-board insertion, the data communication processor undergoes its own power-up sequence. During this period, the processor's logic-output drivers are high impedance and are unable to drive the DE and RE inputs of these devices to a defined logic level. Leakage currents up to 10A from the high-impedance state of the processor's logic drivers could cause standard CMOS enable inputs of a transceiver to drift to an incorrect logic level. Additionally, parasitic circuit-board capacitance could cause coupling of VL or GND to the enable inputs. Without the hot-swap capability, these factors could improperly enable the transceiver's driver or receiver. When VL rises, an internal pulldown circuit holds DE low and RE high. After the initial power-up sequence, the pulldown circuit becomes transparent, resetting the hot-swap tolerable input.
30kV ESD Protection
ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX13430E family of devices have extra protection against static electricity. Maxim's engineers have developed state-of-theart structures to protect these pins against ESD of 30kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, the MAX13430E-MAX13433E keep working without latchup or damage. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the MAX13430E-MAX13433E are characterized for protection to the following limits: * 30kV using the Human Body Model * 10kV using the Contact Discharge method specified in IEC 61000-4-2 * 15kV using the Air Gap Discharge method specified in IEC 61000-4-2
Low-Voltage Logic Interface
VL is the voltage supply for the low-voltage logic interface and receiver output. VL operates with voltage supply from +1.62V to VCC.
Fail Safe
The MAX13430E family guarantees a logic-high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. This is done by setting the receiver input threshold between -50mV and -200mV. If the differential receiver input voltage (A - B) is greater than or equal to -50mV, RO is logic-high.
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RS-485 Transceivers with Low-Voltage Logic Interface
ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. Human Body Model Figure 10a shows the Human Body Model, and Figure 10b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k resistor. IEC 61000-4-2 The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment. However, it does
not specifically refer to integrated circuits. The MAX13430E family of devices helps you design equipment to meet IEC 61000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 61000-4-2 is higher peak current in IEC 61000-4-2 because series resistance is lower in the IEC 61000-4-2 model. Hence, the ESD withstand voltage measured to IEC 61000-4-2 is generally lower than that measured using the Human Body Model. Figure 10c shows the IEC 61000-4-2 model, and Figure 10d shows the current waveform for IEC 610004-2 ESD Contact Discharge test.
MAX13430E-MAX13433E
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
IP 100% 90% AMPS 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Cs 100pF
STORAGE CAPACITOR
tDL CURRENT WAVEFORM
Figure 10a. Human Body ESD Test Model
Figure 10b. Human Body Current Waveform
RC 50M TO 100M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
I 100% 90% IPEAK
Cs 150pF
STORAGE CAPACITOR
10% tr = 0.7ns TO 1ns 30ns 60ns t
Figure 10c. IEC 61000-4-2 ESD Test Model
Figure 10d. IEC 61000-4-2 ESD Generator Current Waveform
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15
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
Applications Information
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is a one-unit load (12k), and the standard driver can drive up to 32 unit loads. The MAX13430E family of transceivers has a 1/8-unit load receiver input impedance (96k), allowing up to 256 transceivers to be connected in parallel on one communication line. Any combination of these devices, as well as other RS-485 transceivers with a total of 32-unit loads or less, can be connected to the line.
Driver Output Protection
Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range (see the Typical Operating Characteristics.) The second, a thermal-shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature exceeds +150C (typ).
Typical Applications
The MAX13430E/MAX13433E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 12 and 13 show typical network applications circuits. To minimize reflections, terminate the line at both ends with its characteristic impedance, and keep stub lengths off the main line as short as possible. The slew-rate-limited MAX13430E/MAX13432E allow the RS-485 network to be more tolerant of imperfect termination.
Reduced EMI and Reflections
The MAX13430E/MAX13432E feature reduced slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps.
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RS-485 Transceivers with Low-Voltage Logic Interface
Typical Application Circuits
120 DI D DE RO RE R R D R B 120 B D DI A B A B A A R RO RE DE
MAX13430E-MAX13433E
MAX13430E MAX13431E
DI
D
DE
RO RE
DI
DE
RO RE
Figure 11. Typical Half-Duplex RS-485 Network
A RO RE DE DI D R 120 B 120
Y D Z DI DE RE RO
Z 120 Y
B R A Y Z B A Y Z B A
R D D
R
MAX13432E MAX13433E
DI
DE RE RO
DI
DE RE RO
Figure 12. Typical Full-Duplex RS-485 Network
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17
RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
Pin Configurations
TOP VIEW VCC 10 B 9 A 8 N.C. 7 GND 6 VCC 14 N.C. 13 A 12 B 11 Z 10 Y 9 GND 8
MAX13430E MAX13431E
MAX13432E MAX13434E *EP
+
1 VL 2 RO 3 DE 4 RE
+
1 VL 2 RO 3 DE 4 RE 5 DI 6 GND
*EP 7 N.C.
5 DI
TDFN
* EXPOSED PAD CONNECT TO GND.
TDFN
* EXPOSED PAD CONNECT TO GND.
VL VL RO DE RE DI 1 2 3 4 5 MAX13430E MAX13431E
1 2 3 4 5 6 7
+
14 13 12 11 10 9 8
VCC N.C. A B Z Y GND
+
10 9 8 7 6
VCC B A N.C. GND
RO DE RE DI GND N.C.
MAX13432E MAX13433E
MAX
SO
Chip Information
PROCESS: BiCMOS
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RS-485 Transceivers with Low-Voltage Logic Interface
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 10 MAX 14 TDFN-EP 10 TDFN-EP 14 SO PACKAGE CODE U10-2 T1433-2 T1033-1 S14-1 DOCUMENT NO. 21-0061 21-0137 21-0137 21-0041
MAX13430E-MAX13433E
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RS-485 Transceivers with Low-Voltage Logic Interface MAX13430E-MAX13433E
Revision History
REVISION NUMBER 0 1 REVISION DATE 10/08 5/09 Initial release Updated Ordering Information. DESCRIPTION PAGES CHANGED -- 1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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