MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Benefits and Features
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.
●
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
Ordering Information
appears at end of data sheet.
Applications
●
●
●
●
Motion Controllers
Encoder Interfaces
HVAC Control Systems
Utility Meters
Functional Diagram
RO
RE
V
CC
A
R
B
RO
RE
A
R
V
CC
B
SHUTDOWN
DE
DI
D
MAX14784E
MAX14786E
Z
Y
DE
DI
Z
Y
MAX14787E
MAX14789E
D
19-6863; Rev 2; 1/15
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Absolute Maximum Ratings
(All voltages referenced to GND.)
V
CC
.....................................................................-0.3V to +6.0V
RE,
RO ..................................................... -0.3V to (V
CC
+ 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 (T
A
= +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
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
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
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
(Note 1)
Junction-to-Case Thermal Resistance (θ
JC
)
Junction-to-Ambient Thermal Resistance (θ
JA
)
8 SO ............................................................................38°C/W
8 SO ..........................................................................132°C/W
14 SO ..........................................................................34°C/W
14 SO ..........................................................................84°C/W
TSSOP.........................................................................30°C/W
TSSOP.........................................................................30°C/W
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.
Electrical Characteristics
(V
CC
= 3.0V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 5V, and T
A
= +25°C.) (Notes 2, 3)
PARAMETER
POWER SUPPLY
Supply Voltage
Supply Current
Shutdown Supply Current
DRIVER
R
L
= 54Ω, V
CC
= 4.5V, Figure 1
Differential Driver Output
Change in Magnitude of Differ-
ential Driver Output Voltage
Driver Common-Mode Output
Voltage
Change in Magnitude of Driver
Common-Mode Output Voltage
Single-Ended Driver Output
Voltage High
Single-Ended Driver Output
Votlage Low
Differential Driver Output Ca-
pacitance
V
OD
R
L
= 100Ω, V
CC
= 3.0V, Figure 1
R
L
= 54Ω, V
CC
= 3.0V, Figure 1
ΔV
OD
V
OC
ΔV
OC
V
OH
V
OL
C
OD
R
L
= 100Ω or 54Ω, Figure 1 (Note 4)
R
L
= 100Ω or 54Ω, Figure 1 (Note 4)
R
L
= 100Ω or 54Ω, Figure 1 (Note 4)
Y and Z outputs, I
Y,Z
= -20mA
Y and Z outputs, I
Y,Z
= +20mA
DE =
RE
= high, f = 4MHz
12
2.2
0.8
V
CC
/2
2.1
2.0
1.5
0.2
3
0.2
V
V
V
V
V
pF
V
V
CC
I
CC
I
SHDN
DE = high,
RE
= low, no load
DE = low,
RE
= high
3.0
1.9
5
5.5
4
10
V
mA
μA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
2
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Electrical Characteristics (continued)
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
(V
CC
= 3.0V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 5V, and T
A
= +25°C.) (Notes 2, 3)
PARAMETER
Peak Driver Short-Circuit
Output Current
RECEIVER
Input Current (A and B)
I
A,B
C
A,B
V
TH
ΔV
TH
R
IN
DE = low,
V
CC
= 0V or
3.6V
V
IN
= +12V
V
IN
= -7V
-200
12
-200
-120
20
48
-10
+250
μA
SYMBOL
I
OSD
CONDITIONS
0V ≤ V
OUT
≤ +12V, output low
-7V ≤ V
OUT
≤ V
CC
, output high
MIN
+40
-250
TYP
MAX
+250
-40
UNITS
mA
Differential Input Capacitance
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Input Resistance
Measured between A and B,
DE = low, f = 2MHz
-7V ≤ V
OUT
≤ +12V
V
CM
= 0V
-7V ≤ V
CM
≤ +12V
pF
mV
mV
kΩ
LOGIC INTERFACE (DI, DE,
RE,
RO)
Input High Voltage
Input Low Voltage
Input Current
RE
Pulldown and DE Pullup
Input Resistance
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Output Three-State
Current
Receiver Output Short-Circuit
Current
PROTECTION
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
V
IH
V
IL
I
IN
R
IN
V
OH
V
OL
I
OZR
I
OSR
DE, DI,
RE
DE, DI,
RE
DI
2.0
0.8
-2
1
+2
V
V
μA
MΩ
V
0.4
V
μA
mA
RE
= low, I
OUT
= -1mA,
(V
A
- V
B
) > 200mV
RE
= low, I
OUT
= +1mA,
(V
A
- V
B
) < -200mV
RE
= high, 0V ≤ V
RO
≤ V
CC
RE
= low, 0V ≤ V
RO
≤ V
CC
V
CC
-
1.5
-1
-95
+1
+95
T
SHDN
ΔT
SHDN
Temperature rising
IEC 61000-4-2 Air Gap Discharge
to GND
IEC 61000-4-2 Contact Discharge
to GND
Human Body Model
Human Body Model
+160
10
±18
±8
±35
±2
°C
°C
ESD Protection
(A, B, Y and Z Pins)
kV
ESD Protection (All Other Pins)
kV
www.maximintegrated.com
Maxim Integrated
│
3
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Switching Characteristics (MAX14784E/MAX14787E)
(V
CC
= 3.0V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 5V, and T
A
= +25°C.) (Notes 2, 5)
PARAMETER
DRIVER
Driver Propagation Delay
Differential Driver Output Skew
|t
DPLH
- t
DPHL
|
Driver Differential Output Rise
or Fall Time
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
Time to Shutdown
RECEIVER
Receiver Propagation Delay
Receiver Output Skew
|t
RPLH
- t
RPHL
|
Maximum Data Rate
Receiver Enable to Output
High
Receiver Enable to Output Low
Receiver Disable Time from
Low
Receiver Disable Time from
High
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
Time to Shutdown
t
RPLH
t
RPHL
t
RSKEW
DR
MAX
t
RZH
t
RZL
t
RLZ
t
RHZ
t
RZH(SHDN)
t
RZL(SHDN)
t
SHDN
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
(Note 7)
50
C
L
= 15pF, Figures 6, 7
C
L
= 15pF, Figures 6, 7 (Note 6)
500
30
30
30
30
100
100
800
200
200
30
ns
ns
kbps
ns
ns
ns
ns
μs
μs
ns
t
DPLH
t
DPHL
t
DSKEW
t
HL,
t
LH
DR
MAX
t
DZH
t
DZL
t
DLZ
t
DHZ
t
DZH(SHDN)
t
DZL(SHDN)
t
SHDN
R
L
= 54Ω, C
L
= 50pF, Figures 2, 3
R
L
= 54Ω, C
L
= 50pF, Figures 2, 3
(Note 6)
R
L
= 54Ω, C
L
= 50pF, Figures 2, 3
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 15pF, Figures 4, 5
R
L
= 110Ω, C
L
= 15pF, Figures 4, 5
(Note 7)
50
500
2500
2500
100
100
100
100
800
1000
1000
140
900
ns
ns
ns
kbps
ns
ns
ns
ns
μs
μs
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
4
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Switching Characteristics (MAX14786E/MAX14789E)
(V
CC
= 3.0V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 5V, and T
A
= +25°C.) (Notes 2, 5)
PARAMETER
DRIVER
Driver Propagation Delay
Differential Driver Output Skew
|t
DPLH
- t
DPHL
|
Driver Differential Output Rise
or Fall Time
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
Time to Shutdown
RECEIVER
Receiver Propagation Delay
Receiver Output Skew
|t
RPLH
- t
RPHL
|
Maximum Data Rate
Receiver Enable to Output
High
Receiver Enable to Output Low
Receiver Disable Time from
Low
Receiver Disable Time from
High
Receiver Enable from
Shutdown to Output High
t
RPLH
t
RPHL
t
RSKEW
DR
MAX
t
RZH
t
RZL
t
RLZ
t
RHZ
t
RZH(SHDN)
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
R
L
= 1kΩ, C
L
= 15pF, Figure 8
C
L
= 15pF, Figures 6, 7
C
L
= 15pF, Figures 6, 7 (Note 6)
25
30
30
30
30
100
25
25
3
ns
ns
Mbps
ns
ns
ns
ns
μs
t
DPLH
t
DPHL
t
DSKEW
t
HL,
t
LH
DR
MAX
t
DZH
t
DZL
t
DLZ
t
DHZ
t
DZH(SHDN)
t
DZL(SHDN)
t
SHDN
R
L
= 54Ω, C
L
= 50pF, Figures 2, 3
R
L
= 54Ω, C
L
= 50pF, Figures 2, 3
(Note 6)
R
L
= 54Ω, C
L
= 50pF, Figures 2, 3
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 50pF, Figures 4, 5
R
L
= 110Ω, C
L
= 15pF, Figures 4, 5
R
L
= 110Ω, C
L
= 15pF, Figures 4, 5
(Note 7)
50
25
40
40
40
40
100
100
800
25
25
3
10
ns
ns
ns
Mbps
ns
ns
ns
ns
μs
μs
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
