General Description
The MAX14784E/MAX14786E/MAX14787E/MAX14789E
full-duplex RS-485 transceivers are designed for robust
communication in harsh industrial environments. All
devices feature ±35kV ESD protection on the RS-485
pins and operate from a 3V to 5.5V supply with a 4mA
no-load supply current (max).
The MAX14784E/MAX14787E are optimized for communi-
cation over very long cables or short unterminated cables.
The MAX14784E/MAX14786E are available in a 14-pin
SO package and operate over the -40°C to +125°C tem-
perature range. The MAX14786E is also available in a
14-pin TSSOP package.
The MAX14787E/MAX14789E are optimized for space-
constrained applications and are available in an 8-pin SO
package, operating over the -40°C to +105°C temperature
range.
Applications
●Motion Controllers
●Encoder Interfaces
●HVAC Control Systems
●Utility Meters
Benets and Features
●Flexibility
• Use in Full-Duplex or Half-Duplex Applications
• Wide 3.0V to 5.5V Supply Voltage Range
• Available with 500kbps and 25Mbps Speed Options
• Available in 8-Pin and 14-Pin SO and TSSOP
Packages
●Optimized for Performance in Harsh Industrial
Environments
• ±35kV ESD (HBM) Protection on RS-485 I/O Ports
• Extended Operating Temperature Range
• Slew-Rate Limited Outputs (MAX14784E/
MAX14787E)
• Integrated Receiver Deglitch Filter Increases Noise
Immunity (MAX14784E/MAX14787E/)
• Short-Circuit Protected Outputs
• True Fail-Safe Receiver
• Thermal Shutdown
●1/4-Unit Load Allows up to 128 Transceivers on the
Bus
19-6863; Rev 2; 1/15
Ordering Information appears at end of data sheet.
SHUTDOWN
V
CC
RO
RE
DE
DI
Y
Z
B
A
MAX14784E
MAX14786E
V
CC
RO
DI
Y
Z
B
A
MAX14787E
MAX14789E
DE
RE
DD
R
R
Functional Diagram
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
(All voltages referenced to GND.)
VCC .....................................................................-0.3V to +6.0V
RE, RO ..................................................... -0.3V to (VCC + 0.3)V
DE, DI ...................................................................-0.3V to +6.0V
A, B, Y, Z ...........................................................-8.0V to +13.0V
Short-Circuit Duration ................................................ Continuous
Continuous Power Dissipation (TA = +70°C)
8 SO (derate 7.6mW/°C above +70°C) .......................606mW
14 SO (derate 11.9mW/°C above +70°C) ...................952mW
TSSOP (derate 10mW/°C above +70°C) ....................796mW
Operating Temperature Range
8 SO ............................................................. -40°C to +105°C
14 SO ........................................................... -40°C to +125°C
TSSOP .......................................................... -40°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) ....................................... +260°C
Junction-to-Case Thermal Resistance (θJC)
8 SO ............................................................................38°C/W
14 SO ..........................................................................34°C/W
TSSOP .........................................................................30°C/W
Junction-to-Ambient Thermal Resistance (θJA)
8 SO ..........................................................................132°C/W
14 SO ..........................................................................84°C/W
TSSOP .........................................................................30°C/W
(Note 1)
Electrical Characteristics
(VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25°C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
Supply Voltage VCC 3.0 5.5 V
Supply Current ICC DE = high, RE = low, no load 1.9 4 mA
Shutdown Supply Current ISHDN DE = low, RE = high 5 10 μA
DRIVER
Differential Driver Output VOD
RL = 54Ω, VCC = 4.5V, Figure 1 2.1
VRL = 100Ω, VCC = 3.0V, Figure 1 2.0
RL = 54Ω, VCC = 3.0V, Figure 1 1.5
Change in Magnitude of Differ-
ential Driver Output Voltage ΔVOD RL = 100Ω or 54Ω, Figure 1 (Note 4) 0.2 V
Driver Common-Mode Output
Voltage VOC RL = 100Ω or 54Ω, Figure 1 (Note 4) VCC/2 3 V
Change in Magnitude of Driver
Common-Mode Output Voltage ΔVOC RL = 100Ω or 54Ω, Figure 1 (Note 4) 0.2 V
Single-Ended Driver Output
Voltage High VOH Y and Z outputs, IY, Z = -20mA 2.2 V
Single-Ended Driver Output
Votlage Low VOL Y and Z outputs, IY, Z = +20mA 0.8 V
Differential Driver Output Ca-
pacitance COD DE = RE = high, f = 4MHz 12 pF
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
2
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Absolute Maximum Ratings
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.
Package Thermal Characteristics
Electrical Characteristics (continued)
(VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25°C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Peak Driver Short-Circuit
Output Current IOSD
0V ≤ VOUT ≤ +12V, output low +40 +250 mA
-7V ≤ VOUT ≤ VCC, output high -250 -40
RECEIVER
Input Current (A and B) IA,B
DE = low,
VCC = 0V or
3.6V
VIN = +12V +250
μA
VIN = -7V -200
Differential Input Capacitance CA,B
Measured between A and B,
DE = low, f = 2MHz 12 pF
Receiver Differential Threshold
Voltage VTH -7V ≤ VOUT ≤ +12V -200 -120 -10 mV
Receiver Input Hysteresis ΔVTH VCM = 0V 20 mV
Receiver Input Resistance RIN -7V ≤ VCM ≤ +12V 48 kΩ
LOGIC INTERFACE (DI, DE, RE, RO)
Input High Voltage VIH DE, DI, RE 2.0 V
Input Low Voltage VIL DE, DI, RE 0.8 V
Input Current IIN DI -2 +2 μA
RE Pulldown and DE Pullup
Input Resistance RIN 1MΩ
Receiver Output High Voltage VOH
RE = low, IOUT = -1mA,
(VA - VB) > 200mV
VCC -
1.5 V
Receiver Output Low Voltage VOL
RE = low, IOUT = +1mA,
(VA - VB) < -200mV 0.4 V
Receiver Output Three-State
Current IOZR RE = high, 0V ≤ VRO ≤ VCC -1 +1 μA
Receiver Output Short-Circuit
Current IOSR RE = low, 0V ≤ VRO ≤ VCC -95 +95 mA
PROTECTION
Thermal Shutdown Threshold TSHDN Temperature rising +160 °C
Thermal Shutdown Hysteresis ΔTSHDN 10 °C
ESD Protection
(A, B, Y and Z Pins)
IEC 61000-4-2 Air Gap Discharge
to GND ±18
kV
IEC 61000-4-2 Contact Discharge
to GND ±8
Human Body Model ±35
ESD Protection (All Other Pins) Human Body Model ±2 kV
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
3
Switching Characteristics (MAX14784E/MAX14787E)
(VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25°C.) (Notes 2, 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER
Driver Propagation Delay tDPLH RL = 54Ω, CL = 50pF, Figures 2, 3 1000 ns
tDPHL 1000
Differential Driver Output Skew
|tDPLH - tDPHL|tDSKEW
RL = 54Ω, CL = 50pF, Figures 2, 3
(Note 6) 140 ns
Driver Differential Output Rise
or Fall Time tHL, tLH RL = 54Ω, CL = 50pF, Figures 2, 3 900 ns
Maximum Data Rate DRMAX RL = 110Ω, CL = 50pF, Figures 4, 5 500 kbps
Driver Enable to Output High tDZH RL = 110Ω, CL = 50pF, Figures 4, 5 2500 ns
Driver Enable to Output Low tDZL RL = 110Ω, CL = 50pF, Figures 4, 5 2500 ns
Driver Disable Time from Low tDLZ RL = 110Ω, CL = 50pF, Figures 4, 5 100 ns
Driver Disable Time from High tDHZ RL = 110Ω, CL = 50pF, Figures 4, 5 100 ns
Driver Enable from Shutdown
to Output High tDZH(SHDN) RL = 110Ω, CL = 15pF, Figures 4, 5 100 μs
Driver Enable from Shutdown
to Output Low tDZL(SHDN) RL = 110Ω, CL = 15pF, Figures 4, 5 100 μs
Time to Shutdown tSHDN (Note 7) 50 800 ns
RECEIVER
Receiver Propagation Delay tRPLH CL = 15pF, Figures 6, 7 200 ns
tRPHL 200
Receiver Output Skew
|tRPLH - tRPHL|tRSKEW CL = 15pF, Figures 6, 7 (Note 6) 30 ns
Maximum Data Rate DRMAX 500 kbps
Receiver Enable to Output
High tRZH RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Enable to Output Low tRZL RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Disable Time from
Low tRLZ RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Disable Time from
High tRHZ RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Enable from
Shutdown to Output High tRZH(SHDN) RL = 1kΩ, CL = 15pF, Figure 8 100 μs
Receiver Enable from
Shutdown to Output Low tRZL(SHDN) RL = 1kΩ, CL = 15pF, Figure 8 100 μs
Time to Shutdown tSHDN (Note 7) 50 800 ns
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
4
Switching Characteristics (MAX14786E/MAX14789E)
(VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25°C.) (Notes 2, 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER
Driver Propagation Delay tDPLH RL = 54Ω, CL = 50pF, Figures 2, 3 25 ns
tDPHL 25
Differential Driver Output Skew
|tDPLH - tDPHL|tDSKEW
RL = 54Ω, CL = 50pF, Figures 2, 3
(Note 6) 3 ns
Driver Differential Output Rise
or Fall Time tHL, tLH RL = 54Ω, CL = 50pF, Figures 2, 3 10 ns
Maximum Data Rate DRMAX RL = 110Ω, CL = 50pF, Figures 4, 5 25 Mbps
Driver Enable to Output High tDZH RL = 110Ω, CL = 50pF, Figures 4, 5 40 ns
Driver Enable to Output Low tDZL RL = 110Ω, CL = 50pF, Figures 4, 5 40 ns
Driver Disable Time from Low tDLZ RL = 110Ω, CL = 50pF, Figures 4, 5 40 ns
Driver Disable Time from High tDHZ RL = 110Ω, CL = 50pF, Figures 4, 5 40 ns
Driver Enable from Shutdown
to Output High tDZH(SHDN) RL = 110Ω, CL = 15pF, Figures 4, 5 100 μs
Driver Enable from Shutdown
to Output Low tDZL(SHDN) RL = 110Ω, CL = 15pF, Figures 4, 5 100 μs
Time to Shutdown tSHDN (Note 7) 50 800 ns
RECEIVER
Receiver Propagation Delay tRPLH CL = 15pF, Figures 6, 7 25 ns
tRPHL 25
Receiver Output Skew
|tRPLH - tRPHL|tRSKEW CL = 15pF, Figures 6, 7 (Note 6) 3 ns
Maximum Data Rate DRMAX 25 Mbps
Receiver Enable to Output
High tRZH RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Enable to Output Low tRZL RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Disable Time from
Low tRLZ RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Disable Time from
High tRHZ RL = 1kΩ, CL = 15pF, Figure 8 30 ns
Receiver Enable from
Shutdown to Output High tRZH(SHDN) RL = 1kΩ, CL = 15pF, Figure 8 100 μs
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
5
Switching Characteristics (MAX14786E/MAX14789E) (continued)
(VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25°C.) (Notes 2, 5)
Note 2: All devices 100% production tested at TA = +25°C. Specifications 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 ground,
unless otherwise noted.
Note 4: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 5: Capacitive load includes test fixture.
Note 6: Not production tested. Guaranteed by design.
Note 7: Shutdown is enabled by bringing RE high and DE low. If the enabled inputs are in this state for less than 50ns, the device
is guaranteed to not enter shutdown. If the enable inputs are in this state for at least 800ns, the device is guaranteed to
have entered shutdown.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Receiver Enable from
Shutdown to Output Low tRZL(SHDN) RL = 1kΩ, CL = 15pF, Figure 8 100 μs
Time to Shutdown tSHDN (Note 7) 50 800 ns
Figure 3. Driver Propagation Delays
1.5V 1.5V
0
DI
Z
Y
20%
80%
20%
80%
0
VO
-VO
VDIFF
tDSKEW = |tDPLH - tDPHL|
VDIFF = VY - VZ
VCC f = 1MHz, tLH ≤ 3ns, tHL ≤ 3ns
1/2 VO
tDPLH
tLH tHL
tDPHL
VO
1/2 VO
Figure 2. Driver Timing Test Circuit
RLCL
VOD
VCC
DI
DE
Y
Z
Figure 1. Driver DC Test Load
VOD
Y
Z
VOC
RL
2
RL
2
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
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Figure 4. Driver Enable and Disable Times (tDZH, tDHZ, tDZH(SHDN))
Figure 5. Driver Enable and Disable Times (tDZL, tDLZ,
tDZL(SHDN))
0
0
0.25V
1.5V
tDZH, tDZH(SHDN)
tDHZ
DE
VCC
VOH
1.5V
OUT
RL
50Ω
OUT
S1
Y
Z
D
DI
0 OR VCC
GENERATOR
DE
CL
RL
50Ω
CL
OUT
0
0.25V
1.5V
tDZL, tDZL(SHDN)
tDLZ
DE
S1
Y
Z
D
DI
0 OR VCC
VCC
VCC
1.5V
VCC
OUT
VOL
GENERATOR
DE
Figure 6. Receiver Propagation Delay Test Circuit
Figure 7. Receiver Propagation Delays
VID
B
A
RECEIVER
OUTPUT
ATER
A
B
VOH
VOL
RO
tRPHL
tRSKEW = |tRPHL - tRPLH|
t = 1MHz, tLH ≤ 3ns, tHL ≤ 3ns
tRPLH
-1V
1V
1.5V 1.5V
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
7
Figure 8. Receiver Enable and Disable Times
GENERATOR 50I
RL
1kI
CL
15pF
R
-1.5V
+1.5V
RO
S1 VCC
S2
S3
VID
RE
RE
RO
RE
RO
RE
RE
RO
RO
0
tRHZ tRLZ
0.25V
0.25V
1.5V 1.5V
0 0
2
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
VOH
0
0
VOH
VCC
VCC
VCC
1.5V1.5V
VCC
tRZL, tRZL(SHDN)
VOL
0
VCC
VCC
VCC
VOL
tRZH, tRZH (SHDN)
2
VCC
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
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(VCC = 5V, TA = +25°C, unless otherwise noted.)
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25
SUPPLY CURRENT (mA)
DATA RATE (Mbps)
MAX14786E/MAX14789E
SUPPLY CURRENT vs. DATA RATE
toc04
5V, NO LOAD
3.3V, NO
LOAD
5V, 54Ω
LOAD
3.3V, 54ΩLOAD
DE = VCC
RE = GND
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
-40 -25 -10 520 35 50 65 80 95 110 125
SUPPLY CURRENT (mA)
TEMPERATURE (°C)
NO LOAD SUPPLY CURRENT
vs.TEMPERATURE
toc01
DE = VCC
RE = GND
NO LOAD
Y and Z OPEN
VCC = 3.3V VCC = 5V
toc01
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
-40 -25 -10 520 35 50 65 80 95 110 125
VOD (V)
TEMPERATURE (°C)
DIFFERENTIAL DRIVER OUTPUT
VOLTAGE vs. TEMPERATURE
toc07
VCC = 5V
VCC = 3.3V
0
1
2
3
4
5
6
7
8
9
10
-40 -25 -10 520 35 50 65 80 95 110 125
SHUTDOWN SUPPLY CURRENT (µA)
TEMPERATURE (°C)
MAX14784E/MAX14786E
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE toc02
DE = GND
RE = VCC
VCC = 3.3V
VCC = 5V
200
250
300
350
400
450
500
550
600
-40 -25 -10 520 35 50 65 80 95 110 125
PROPAGATION DELAY (ns)
TEMPERATURE (°C)
MAX14784E/MAX14787E
DRIVER PROPAGATION DELAY
vs. TEMPERATURE toc08
tDPHL, VCC = 3.3V tDPLH, VCC = 3.3V
tDPHL, VCC = 5V
tDPLH, VCC = 5V
0
10
20
30
40
50
60
70
80
0100 200 300 400 500
SUPPLY CURRENT (mA)
DATA RATE (kbps)
MAX14784E/MAX14787E
SUPPLY CURRENT vs. DATA RATE
toc03
5V, 54Ωload
DE = VCC
RE = GND
3.3V, 54Ωload
5V, no load
3.3V, no load
0.0
5.0
10.0
15.0
20.0
25.0
30.0
-40 -25 -10 520 35 50 65 80 95 110 125
PROPAGATION DELAY (ns)
TEMPERATURE (°C)
MAX14786E/MAX14789E
DRIVER PROPAGATION DELAY
vs. TEMPERATURE toc09
tDPHL, VCC = 3.3V tDPLH , VCC = 3.3V
tDPHL, VCC = 5V tDPLH , VCC = 5V
RL= 54Ω
CL= 50pF
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
010 20 30 40 50 60
VOH (V)
OUTPUT CURRENT (mA)
RECEIVER OUTPUT HIGH
VOLTAGE vs. OUTPUT CURRENT
toc05
OUTPUT SOURCING CURRENT
VCC = 5V
VCC = 3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
010 20 30 40 50 60
VOH (V)
OUTPUT CURRENT (mA)
RECEIVER OUTPUT LOW
VOLTAGE vs. OUTPUT CURRENT
toc06
OUTPUT SINKING CURRENT
VCC = 5V
VCC = 3.3V
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Typical Operating Characteristics
(VCC = 5V, TA = +25°C, unless otherwise noted.)
0
1
2
3
4
5
6
-40 -25 -10 520 35 50 65 80 95 110 125
RISE/FALL TIME (ns)
TEMPERATURE (°C)
MAX14786E/MAX14789E
DRIVER OUTPUT RISE AND FALL TIME
vs. TEMPERATURE toc13
tHL, VCC = 3.3V
tHL, VCC = 5V
tLH, VCC = 3.3V
tLH, VCC = 5V
-50
-40
-30
-20
-10
0
10
20
30
40
50
-40 -25 -10 520 35 50 65 80 95 110 125
tDSKEW (ns)
TEMPERATURE (°C)
MAX14784E/MAX14787E
DIFFERENTIAL DRIVER SKEW
vs. TEMPERATURE toc10
VCC = 3.3V
VCC = 5V
RL = 54Ω
CL= 50pF
-5
-4
-3
-2
-1
0
1
2
3
4
5
-40 -25 -10 520 35 50 65 80 95 110 125
tDSKEW (ns)
TEMPERATURE (°C)
MAX14786E/MAX14789E
DIFFERENTIAL DRIVER
SKEW vs. TEMPERATURE
RL= 54
CL= 50pF
toc11
RL= 54Ω
CL= 50pF
VCC = 3.3V
VCC = 5V
0
100
200
300
400
500
600
700
800
900
-40 -25 -10 520 35 50 65 80 95 110 125
RISE/FALL TIME (ns)
TEMPERATURE (°C)
MAX14784E/MAX14787E
DRIVER OUTPUT RISE AND FALL
TIME vs. TEMPERATURE toc12
tHL, VCC = 3.3V tLH, VCC = 3.3V
tHL, VCC = 5V
tLH, VCC = 5V
RL= 54Ω
CL= 50pF
0
10
20
30
40
50
60
70
80
90
100
-40 -25 -10 520 35 50 65 80 95 110 125
OUTPUT TRANSITION SKEW (ns)
TEMPERATURE (°C)
MAX14784E/MAX14787E
DRIVER OUTPUT TRANSITION
SKEW vs. TEMPERATURE toc14
VCC = 3.3V
RL= 54Ω
CL= 50pF
VCC = 5V
0.0
0.1
0.2
0.3
0.4
0.5
0.6
-40 -25 -10 520 35 50 65 80 95 110 125
OUTPUT TRANSITION SKEW (ns)
TEMPERATURE (°C)
MAX14786E/MAX14789E
DRIVER OUTPUT TRANSITION SKEW
vs. TEMPERATURE toc15
VCC = 3.3V VCC = 5V
MAX14784E/MAX14787E
PROPAGATION DELAY
5V/div (AC-
COUPLED)
DI
5V/div
Y/A
2V/div
Z/B
2V/div
toc16
100ns
LOOPBACK CONFIGURATION
RO
5V/div
Maxim Integrated
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10
www.maximintegrated.com
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Typical Operating Characteristics (continued)
(VCC = 5V, TA = +25°C, unless otherwise noted.)
MAX14786E/MAX14789E
PROPAGATION DELAY
DI
5V/div
Y/A
2V/div
Z/B
2V/div
toc18
10ns
LOOPBACK CONFIGURATION
RO
5V/div
MAX14784E/MAX14787E
PROPAGATION DELAY
5V/div (AC-
COUPLED)
toc17
DI
5V/div
Y/A
2V/div
Z/B
2V/div
100ns
LOOPBACK CONFIGURATION
RO
5V/div
MAX14786E/MAX14789E
PROPAGATION DELAY
DI
5V/div
Y/A
2V/div
Z/B
2V/div
toc19
10ns
LOOPBACK CONFIGURATION
RO
5V/div
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
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│
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Typical Operating Characteristics (continued)
PIN
NAME FUNCTION
MAX14784E
MAX14786E
MAX14787E
MAX14789E
1, 8, 13 — N.C. No Connection. Not internally connected.
2 2 RO Receiver Output. Drive RE low to enable RO. RO is always active on the MAX14787E
and the MAX14789E. See the Function Tables section.
3 — RE
Receiver Enable. Drive RE low, or leave unconnected, to enable RO. RO is high imped-
ance when RE is high. Drive RE high and DE low to enter low-power shutdown mode.
RE has a weak pulldown to GND.
4 — DE
Driver Enable. Drive DE high, or leave unconnected, to enable the driver outputs. The
driver outputs are high impedance when DE is low. Drive RE high and DE low to enter
low-power shutdown mode (MAX14784E and MAX14786E only).
5 3 DI
Driver Input. Drive DE high on the MAX14784E and MAX14786E to enable the driver
outputs. Driver outputs are always active on the MAX14787E and the MAX14789E. A
low on DI forces the noninverting output, Y, low and the inverting output, Z, high. Simi-
larly, a high on DI forces the noninverting output, Y, high and the inverting output, Z, low.
DE has a weak pullup to VCC.
6, 7 4 GND Ground
9 5 Y Noninverting Driver Output
10 6 Z Inverting Driver Output
11 7 B Inverting Receiver Input
12 8 ANoninverting Receiver Input
14 1 VCC Positive Supply. Bypass VCC to GND with a 0.1µF capacitor as close as possible to the IC.
A
BDE
1
2
14
13
V
CC
N.C.RO
RE
N.C.
TOP VIEW
3
4
12
11
Y
N.C.GND
5 10 ZDI
GND 6
7
9
8
+
MAX14784E
MAX14786E
V
CC
+
RO
DI
1
2
3
4
8
7
6
5GND
A
B
Z
Y
SO
MAX14787E
MAX14789E
SO/TSSOP
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
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│
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Pin Description
Pin Congurations
Detailed Description
The MAX14784E/MAX14786E/MAX14787E/MAX14789E
are ±35kV ESD protected RS-485 transceivers intended
for high-speed, full-duplex communication. These devices
operate from a +3.0V to +5.5V supply and feature true
fail-safe circuitry, guaranteeing a logic high on the receiv-
er output when inputs are open or shorted.
The MAX14784E and MAX14787E feature a slew-rate
limited driver that minimizes EMI and reduces reflections
caused by improperly-terminated cables, allowing error-
free data transmission at data rates up to 500kbps. The
MAX14784E/MAX14787E feature an added deglitch filter
on the receiver signal path for enhanced noise immu-
nity when differential signals have very slow rise and fall
times. Driver outputs are short-circuit current-limited, with
thermal shutdown circuitry that protects drivers against
excessive power dissipation.
The MAX14784E/MAX14786E/MAX14787E/MAX14789E
transceivers draw 4mA (max) of supply current when
unloaded, or when fully-loaded with the drivers disabled.
The MAX14784E and MAX14786E draw less than 10μA
(max) of supply current in low-power shutdown mode.
True Fail-Safe
The MAX14784E/MAX14786E/MAX14787E/MAX14789E
guarantee a logic-high receiver output when either the
receiver inputs are shorted or open, or when they are con-
nected to a terminated transmission line with all drivers
disabled. If the differential receiver input voltage (VA - VB)
is greater than or equal to -10mV, RO is logic-high.
Receiver Input Deglitch Filter (MAX14784E/
MAX14787E Only)
The MAX14784E/MAX14787E include integrated circuitry
to filter received data. This input deglitch filter reduces
false triggers that can occur when data is passed over
long cables. To minimize impact on the bus, the integrated
filter is not connected to the receiver inputs. Instead, data
is filtered after the differential receiver input but before
reaching RO.
Driver Single-Ended Operation
The Y and Z outputs can either be used in the standard
differential operating mode, or can be used a single-
ended outputs. Since the Y and Z driver outputs swing
rail-to-rail, they can individually be used as standard TTL
logic outputs.
Function Tables
TRANSMITTING
INPUTS OUTPUTS
RE* DE* DI Y Z
X1110
X1001
0 0 X High-Impedance
1 0 X Shutdown
RECEIVING
INPUTS OUTPUT
RE* DE* VA - VBRO
0 X ≥ -10mV 1
0 X ≤ -200mV 0
0 X Open/shorted 1
1 1 X High-Impedance
1 0 X Shutdown
*RE and DE on the MAX14787E and MAX14789E are internal. The driver outputs and receiver are always active in these devices.
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
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│
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Half-Duplex Operation
The MAX14784E/MAX14786E are full-duplex transceiv-
ers with driver and receiver enable/disable functionality.
To use these devices in a half-duplex configuration, con-
nect the Y output to the A input and connect the Z output
to the B input.
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus contention.
The first, a current limit on the output stage, provides
immediate protection against short-circuits over the whole
common-mode voltage range. The second, a thermal shut-
down circuit, force the driver outputs into a high-impedance
state if the die temperature exceeds +160°C (typ).
Low-Power Shutdown Mode (MAX14784E/
MAX14786E Only)
Low-power shutdown mode is initiated by bringing both
RE high and DE low. In shutdown, the devices draw only
10µA (max) of supply current. RE and DE can be driven
simultaneously; the devices are guaranteed not to enter
shutdown if RE is high and DE is low for less than 50ns. If
the inputs are in this state for at least 800ns, the devices
are guaranteed to enter shutdown.
±35kV ESD Protection
ESD protection structures are incorporated on all pins to
protect against electrostatic discharge encountered dur-
ing handling and assembly. The driver outputs and receiv-
er inputs of the MAX14784E/MAX14786E/MAX14787E/
MAX14789E have extra protection against static electric-
ity. The ESD structures withstand high ESD in all states:
normal operation, shutdown, and powered down. After an
ESD event, the devices keep working without latchup or
damage.
ESD protection can be tested in various ways. The trans-
mitter outputs and receiver inputs of the MAX14784E/
MAX14786E/MAX14787E/MAX14789E are characterized
for protection to the following limits:
●±35kV HBM
● ±18kV using the Air-Gap Discharge method specied
in IEC 61000-4-2
● ±8kV using the Contact Discharge method specied
in the IEC 61000-4-2
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 (HBM)
Figure 9 shows the HBM test model, while Figure 10
shows the current waveform it generates when dis-
charged in a low-impedance state. This model consists of
a 100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ 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 MAX14784E/
MAX14786E/MAX14787E/MAX14789E help facilitate
designing equipment to meet the IEC 61000-4-2 speci-
fication without the need for additional ESD protection
components.
The major difference between tests performed using
the HBM and IEC 61000-4-2 is higher peak current in
IEC 61000-4-2 due to lower series resistance 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 HBM.
Figure 11 shows the IEC 61000-4-2 model, while Figure
12 shows the current waveform for IEC 61000-4-2 ESD
Contact Discharge Test.
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
14
Figure 9. Human Body ESD Test Model Figure 10. Human Body Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
1MΩ
RD
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
IP 100%
90%
36.8%
tRL TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPS
Figure 11. IEC 61000-4-2 ESD Test Model Figure 12. IEC 61000-4-2 ESD Generator Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC
50MΩ TO 100MΩ
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
tr = 0.7ns TO 1ns 30ns
60ns
t
100%
90%
10%
IPEAK
I
RO
DE
DI
Y
Z
B
A
RE
R
DRO
DE
DI
Y
Z
B
A
RE
R
D
RODEDI
Y Z B A
RE
R
D
RODEDI
Y Z B A
RE
R
D
MAX14784E
MAX14786E
MASTER
SLAVE SLAVE
SLAVE
Typical Application Circuit
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
15
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 SO S8+4 21-0041 90-0096
14 SO S14+1 21-0041 90-0112
14 TSSOP U14+1 21-0066 90-0113
Ordering Information/Selector Guide
PART DATA RATE
(MAX)
DRIVER SLEW-
RATE LIMITED
DEGLITCHED
RECEIVER SIGNAL
DRIVER/
RECEIVER
ENABLE
TEMP RANGE PIN-
PACKAGE
MAX14784EASD+ 500kbps Yes Yes Yes -40°C to +125°C 14 SO
MAX14786EASD+ 25Mbps No No Yes -40°C to +125°C 14 SO
MAX14786EAUD+ 25Mbps No No Yes -40°C to +125°C 14 TSSOP
MAX14787EGSA+ 500kbps Yes Yes No -40°C to +105°C 8 SO
MAX14789EGSA+ 25Mbps No No No -40°C to +105°C 8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Application Circuit (continued)
RO
DI
Y
Z
B
A
D
R
RO
DI
Y
Z
B
A
D
R
MAX14787E
MAX14789E
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
www.maximintegrated.com Maxim Integrated
│
16
Chip Information
PROCESS: BiCMOS
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 12/13 Initial release —
1 6/14 Removed future product asterisk from MAX14789E 1
2 1/15 Updated General Description and Benets and Features sections 1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2015 Maxim Integrated Products, Inc.
│
17
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
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.
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Authorized Distributor
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