MAX14787E [MAXIM]
Full-Duplex, ±35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication;
| 型号： | MAX14787E |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Full-Duplex, ±35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication |
| 文件： | 总17页 (文件大小：846K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
General Description
Benefits and Features
● Flexibility
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).
• 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
The MAX14784E/MAX14787E are optimized for communi-
cation over very long cables or short unterminated cables.
• ±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
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.
• Thermal Shutdown
● 1/4-Unit Load Allows up to 128 Transceivers on the
Applications
Bus
● Motion Controllers
● Encoder Interfaces
● HVAC Control Systems
● Utility Meters
Ordering Information appears at end of data sheet.
Functional Diagram
A
A
RO
R
RO
B
R
RE
B
RE
VCC
VCC
SHUTDOWN
DE
DE
Z
Z
DI
D
Y
DI
D
Y
MAX14784E
MAX14786E
MAX14787E
MAX14789E
19-6863; Rev 2; 1/15
MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Absolute Maximum Ratings
(All voltages referenced to GND.)
Operating Temperature Range
V
.....................................................................-0.3V to +6.0V
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
CC
RE, RO..................................................... -0.3V to (V
+ 0.3)V
CC
DE, DI...................................................................-0.3V to +6.0V
A, B, Y, Z ...........................................................-8.0V to +13.0V
Short-Circuit Duration................................................Continuous
Continuous Power Dissipation (T = +70°C)
A
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
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.
(Note 1)
Package Thermal Characteristics
Junction-to-Case Thermal Resistance (θ
)
Junction-to-Ambient Thermal Resistance (θ
)
JA
JC
8 SO ............................................................................38°C/W
14 SO ..........................................................................34°C/W
TSSOP.........................................................................30°C/W
8 SO ..........................................................................132°C/W
14 SO ..........................................................................84°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
= 3.0V to 5.5V, T = T
to T
, unless otherwise noted. Typical values are at V
= 5V, and T = +25°C.) (Notes 2, 3)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
Supply Voltage
Supply Current
Shutdown Supply Current
DRIVER
V
I
3.0
5.5
4
V
CC
DE = high, RE = low, no load
DE = low, RE = high
1.9
5
mA
μA
CC
I
10
SHDN
R = 54Ω, V
= 4.5V, Figure 1
2.1
2.0
1.5
L
CC
Differential Driver Output
V
R = 100Ω, V = 3.0V, Figure 1
CC
V
OD
L
R = 54Ω, V
= 3.0V, Figure 1
L
CC
Change in Magnitude of Differ-
ential Driver Output Voltage
ΔV
R = 100Ω or 54Ω, Figure 1 (Note 4)
0.2
3
V
V
OD
OC
OL
L
Driver Common-Mode Output
Voltage
V
R = 100Ω or 54Ω, Figure 1 (Note 4)
V
/2
OC
L
CC
Change in Magnitude of Driver
Common-Mode Output Voltage
ΔV
R = 100Ω or 54Ω, Figure 1 (Note 4)
0.2
V
L
Single-Ended Driver Output
Voltage High
V
Y and Z outputs, I
Y and Z outputs, I
= -20mA
= +20mA
2.2
V
OH
Y,Z
Y,Z
Single-Ended Driver Output
Votlage Low
V
0.8
V
Differential Driver Output Ca-
pacitance
C
DE = RE = high, f = 4MHz
12
pF
OD
Maxim Integrated
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Electrical Characteristics (continued)
(V
= 3.0V to 5.5V, T = T
to T
, unless otherwise noted. Typical values are at V
= 5V, and T = +25°C.) (Notes 2, 3)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
+250
-40
UNITS
0V ≤ V
≤ +12V, output low
+40
Peak Driver Short-Circuit
Output Current
OUT
I
mA
OSD
-7V ≤ V
≤ V , output high
-250
OUT
CC
RECEIVER
DE = low,
= 0V or
3.6V
V
V
= +12V
= -7V
+250
IN
Input Current (A and B)
I
V
μA
A,B
CC
-200
IN
Measured between A and B,
DE = low, f = 2MHz
Differential Input Capacitance
C
12
pF
A,B
Receiver Differential Threshold
Voltage
V
-7V ≤ V
≤ +12V
-200
48
-120
20
-10
mV
TH
OUT
Receiver Input Hysteresis
Receiver Input Resistance
ΔV
V
= 0V
CM
mV
TH
R
-7V ≤ V
≤ +12V
kΩ
IN
CM
LOGIC INTERFACE (DI, DE, RE, RO)
Input High Voltage
V
DE, DI, RE
2.0
-2
V
IH
Input Low Voltage
Input Current
V
DE, DI, RE
0.8
+2
V
IL
I
DI
μA
IN
RE Pulldown and DE Pullup
Input Resistance
R
1
MΩ
V
IN
RE = low, I
= -1mA,
V
-
OUT
CC
1.5
Receiver Output High Voltage
Receiver Output Low Voltage
V
OH
(V - V ) > 200mV
A
B
RE = low, I
= +1mA,
OUT
V
0.4
+1
V
OL
(V - V ) < -200mV
A
B
Receiver Output Three-State
Current
I
RE = high, 0V ≤ V
≤ V
CC
-1
μA
mA
OZR
OSR
RO
Receiver Output Short-Circuit
Current
I
RE = low, 0V ≤ V
≤ V
-95
+95
RO
CC
PROTECTION
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
T
Temperature rising
+160
10
°C
°C
SHDN
ΔT
SHDN
IEC 61000-4-2 Air Gap Discharge
to GND
±18
±8
ESD Protection
(A, B, Y and Z Pins)
kV
kV
IEC 61000-4-2 Contact Discharge
to GND
Human Body Model
Human Body Model
±35
±2
ESD Protection (All Other Pins)
Maxim Integrated
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Switching Characteristics (MAX14784E/MAX14787E)
(V
= 3.0V to 5.5V, T = T
to T
, unless otherwise noted. Typical values are at V
= 5V, and T = +25°C.) (Notes 2, 5)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER
t
1000
1000
DPLH
Driver Propagation Delay
R = 54Ω, C = 50pF, Figures 2, 3
ns
ns
ns
L
L
t
DPHL
Differential Driver Output Skew
|t - t
R = 54Ω, C = 50pF, Figures 2, 3
L
L
t
140
900
DSKEW
|
(Note 6)
DPLH DPHL
Driver Differential Output Rise
or Fall Time
t
t
R = 54Ω, C = 50pF, Figures 2, 3
L L
HL, LH
Maximum Data Rate
DR
R = 110Ω, C = 50pF, Figures 4, 5
500
kbps
ns
MAX
L
L
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
R = 110Ω, C = 50pF, Figures 4, 5
2500
2500
100
DZH
L
L
t
R = 110Ω, C = 50pF, Figures 4, 5
ns
DZL
DLZ
DHZ
L
L
t
R = 110Ω, C = 50pF, Figures 4, 5
ns
L
L
t
R = 110Ω, C = 50pF, Figures 4, 5
100
ns
L
L
Driver Enable from Shutdown
to Output High
t
R = 110Ω, C = 15pF, Figures 4, 5
100
μs
DZH(SHDN)
L
L
Driver Enable from Shutdown
to Output Low
t
R = 110Ω, C = 15pF, Figures 4, 5
100
800
μs
DZL(SHDN)
L
L
Time to Shutdown
t
(Note 7)
50
ns
SHDN
RECEIVER
t
200
200
RPLH
Receiver Propagation Delay
C = 15pF, Figures 6, 7
ns
L
t
RPHL
Receiver Output Skew
t
C = 15pF, Figures 6, 7 (Note 6)
30
ns
kbps
ns
RSKEW
L
|t
- t
|
RPLH RPHL
Maximum Data Rate
DR
500
MAX
Receiver Enable to Output
High
t
R = 1kΩ, C = 15pF, Figure 8
30
30
30
RZH
L
L
Receiver Enable to Output Low
t
R = 1kΩ, C = 15pF, Figure 8
ns
RZL
L
L
Receiver Disable Time from
Low
t
R = 1kΩ, C = 15pF, Figure 8
ns
RLZ
L
L
Receiver Disable Time from
High
t
R = 1kΩ, C = 15pF, Figure 8
30
ns
RHZ
L
L
Receiver Enable from
Shutdown to Output High
t
R = 1kΩ, C = 15pF, Figure 8
100
μs
RZH(SHDN)
L
L
Receiver Enable from
Shutdown to Output Low
t
R = 1kΩ, C = 15pF, Figure 8
100
800
μs
RZL(SHDN)
L
L
Time to Shutdown
t
(Note 7)
50
ns
SHDN
Maxim Integrated
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Switching Characteristics (MAX14786E/MAX14789E)
(V
= 3.0V to 5.5V, T = T
to T
, unless otherwise noted. Typical values are at V
= 5V, and T = +25°C.) (Notes 2, 5)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER
t
25
25
DPLH
Driver Propagation Delay
R = 54Ω, C = 50pF, Figures 2, 3
ns
ns
ns
L
L
t
DPHL
Differential Driver Output Skew
|t - t
R = 54Ω, C = 50pF, Figures 2, 3
L
L
t
3
DSKEW
|
(Note 6)
DPLH DPHL
Driver Differential Output Rise
or Fall Time
t
t
R = 54Ω, C = 50pF, Figures 2, 3
10
HL, LH
L
L
Maximum Data Rate
DR
R = 110Ω, C = 50pF, Figures 4, 5
25
Mbps
ns
MAX
L
L
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
R = 110Ω, C = 50pF, Figures 4, 5
40
40
40
40
DZH
L
L
t
R = 110Ω, C = 50pF, Figures 4, 5
ns
DZL
DLZ
DHZ
L
L
t
R = 110Ω, C = 50pF, Figures 4, 5
ns
L
L
t
R = 110Ω, C = 50pF, Figures 4, 5
ns
L
L
Driver Enable from Shutdown
to Output High
t
R = 110Ω, C = 15pF, Figures 4, 5
100
μs
DZH(SHDN)
L
L
Driver Enable from Shutdown
to Output Low
t
R = 110Ω, C = 15pF, Figures 4, 5
100
800
μs
DZL(SHDN)
L
L
Time to Shutdown
t
(Note 7)
50
ns
SHDN
RECEIVER
t
25
25
RPLH
Receiver Propagation Delay
C = 15pF, Figures 6, 7
ns
L
t
RPHL
Receiver Output Skew
t
C = 15pF, Figures 6, 7 (Note 6)
3
ns
Mbps
ns
RSKEW
L
|t
- t
|
RPLH RPHL
Maximum Data Rate
DR
25
MAX
Receiver Enable to Output
High
t
R = 1kΩ, C = 15pF, Figure 8
30
30
30
RZH
L
L
Receiver Enable to Output Low
t
R = 1kΩ, C = 15pF, Figure 8
ns
RZL
L
L
Receiver Disable Time from
Low
t
R = 1kΩ, C = 15pF, Figure 8
ns
RLZ
L
L
Receiver Disable Time from
High
t
R = 1kΩ, C = 15pF, Figure 8
30
ns
RHZ
L
L
Receiver Enable from
Shutdown to Output High
t
R = 1kΩ, C = 15pF, Figure 8
100
μs
RZH(SHDN)
L
L
Maxim Integrated
│ 5
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Switching Characteristics (MAX14786E/MAX14789E) (continued)
(V
= 3.0V to 5.5V, T = T
to T
, unless otherwise noted. Typical values are at V
= 5V, and T = +25°C.) (Notes 2, 5)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
100
UNITS
μs
Receiver Enable from
Shutdown to Output Low
t
R = 1kΩ, C = 15pF, Figure 8
RZL(SHDN)
L
L
Time to Shutdown
t
(Note 7)
50
800
ns
SHDN
Note 2: All devices 100% production tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
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: ΔV
and ΔV
are the changes in V
and V , respectively, when the DI input changes state.
OD
OC
OD OC
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.
V
CC
Y
DE
R
L
Y
Z
2
DI
V
OD
R
L
C
L
V
OD
R
L
V
OC
2
Z
Figure 2. Driver Timing Test Circuit
Figure 1. Driver DC Test Load
f = 1MHz, t ≤ 3ns, t ≤ 3ns
LH
HL
V
CC
1.5V
1.5V
DI
0
1/2 V
O
t
DPHL
t
DPLH
Z
Y
1/2 V
O
V
O
V
DIFF
= V - V
Y Z
V
O
80%
80%
V
DIFF
0
20%
20%
-V
O
t
t
HL
LH
t
|t
- t
|
DSKEW = DPLH DPHL
Figure 3. Driver Propagation Delays
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Y
S1
DI
V
0
0 OR V
CC
OUT
CC
D
1.5V
C
L
Z
DE
t
, t
R
L
DZH DZH(SHDN)
DE
0.25V
V
0
OH
1.5V
GENERATOR
OUT
50Ω
t
DHZ
Figure 4. Driver Enable and Disable Times (t
, t
, t
)
DZH DHZ DZH(SHDN)
V
CC
R
L
Y
S1
DI
0 OR V
OUT
CC
D
C
L
Z
DE
GENERATOR
A
B
50Ω
RECEIVER
OUTPUT
R
ATE
V
ID
V
0
CC
1.5V
DE
t
, t
DZL DZL(SHDN)
t
DLZ
V
CC
OUT
1.5V
V
OL
0.25V
Figure 6. Receiver Propagation Delay Test Circuit
Figure 5. Driver Enable and Disable Times (t
, t
,
DZL DLZ
t
)
DZL(SHDN)
t = 1MHz, t ≤ 3ns, t ≤ 3ns
LH
HL
A
B
1V
-1V
t
t
RPHL
RPLH
V
OH
RO
1.5V
1.5V
V
OL
t
|t
- t
|
RSKEW = RPHL RPLH
Figure 7. Receiver Propagation Delays
Maxim Integrated
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
+1.5V
-1.5V
S3
R
1kI
S1
L
V
CC
RO
V
R
ID
S2
C
L
15pF
RE
GENERATOR
50I
V
0
V
CC
CC
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
RE
1.5V
1.5V
RE
0
t
t
RZH, RZH (SHDN)
t
, t
RZL RZL(SHDN)
RO
V
V
V
OH
CC
2
CC
OL
V
CC
2
0
V
RO
RE
V
V
CC
CC
OH
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
1.5V
1.5V
RE
0
0
V
0
t
t
RLZ
RHZ
RO
V
CC
OL
0.25V
0.25V
V
RO
Figure 8. Receiver Enable and Disable Times
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Typical Operating Characteristics
(V
= 5V, T = +25°C, unless otherwise noted.)
A
CC
MAX14784E/MAX14786E
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX14784E/MAX14787E
SUPPLY CURRENT vs. DATA RATE
NO LOAD SUPPLY CURRENT
vs.TEMPERATURE
toc03
toc01
toc02
80
70
60
50
40
30
20
10
0
4.0
10
9
8
7
6
5
4
3
2
1
0
DE = VCC
RE = GND
5V, 54Ω load
DE = GND
RE = VCC
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
VCC = 5V
VCC = 5V
3.3V, 54Ω load
VCC = 3.3V
VCC = 3.3V
5V, no load
DE = VCC
RE = GND
NO LOAD
3.3V, no load
100
Y and Z OPEN
0
200
300
400
500
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
DATA RATE (kbps)
RECEIVER OUTPUT HIGH
VOLTAGE vs. OUTPUT CURRENT
RECEIVER OUTPUT LOW
MAX14786E/MAX14789E
SUPPLY CURRENT vs. DATA RATE
VOLTAGE vs. OUTPUT CURRENT
OUTPUT SINKING CURRENT
VCC = 5V
toc04
toc05
toc06
100
90
80
70
60
50
40
30
20
10
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
5V, 54Ω
LOAD
OUTPUT SOURCING CURRENT
DE = VCC
RE = GND
VCC = 5V
3.3V, 54Ω LOAD
VCC = 3.3V
5V, NO LOAD
VCC = 3.3V
3.3V, NO
LOAD
0
5
10
15
20
25
0
10
20
30
40
50
60
0
10
20
30
40
50
60
DATA RATE (Mbps)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
MAX14784E/MAX14787E
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
MAX14786E/MAX14789E
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
DIFFERENTIAL DRIVER OUTPUT
VOLTAGE vs. TEMPERATURE
toc07
toc08
toc09
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
600
550
500
450
400
350
300
250
200
30.0
25.0
20.0
15.0
10.0
5.0
RL = 54Ω
CL = 50pF
VCC = 5V
tDPLH , VCC = 3.3V
tDPHL, VCC = 3.3V
tDPLH, VCC = 5V
tDPHL, VCC = 5V
tDPHL, VCC = 5V
tDPLH , VCC = 5V
VCC = 3.3V
tDPLH, VCC = 3.3V
tDPHL, VCC = 3.3V
0.0
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Maxim Integrated
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
A
CC
MAX14784E/MAX14787E
DIFFERENTIAL DRIVER SKEW
MAX14784E/MAX14787E
DRIVER OUTPUT RISE AND FALL
TIME vs. TEMPERATURE
MAX14786E/MAX14789E
DIFFERENTIAL DRIVER
SKEW vs. TEMPERATURE
vs. TEMPERATURE
toc11
toc10
toc12
50
5
4
900
800
700
600
500
400
300
200
100
0
RL = 54Ω
CL = 50pF
RL = 54Ω
CL = 50pF
RL = 54Ω
CL = 50pF
40
30
3
VCC = 5V
VCC = 5V
20
10
0
2
tLH, VCC = 5V
1
tHL, VCC = 5V
0
-10
-1
-2
-3
-4
-5
VCC = 3.3V
-20
VCC = 3.3V
-30
-40
-50
tLH, VCC = 3.3V
tHL, VCC = 3.3V
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
MAX14784E/MAX14787E
DRIVER OUTPUT TRANSITION
SKEW vs. TEMPERATURE
MAX14786E/MAX14789E
DRIVER OUTPUT RISE AND FALL TIME
vs. TEMPERATURE
toc14
toc13
100
90
80
70
60
50
40
30
20
10
0
6
5
4
3
2
1
0
RL = 54Ω
CL = 50pF
tHL, VCC = 3.3V
VCC = 3.3V
tLH, VCC = 3.3V
VCC = 5V
tHL, VCC = 5V
tLH, VCC = 5V
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
MAX14786E/MAX14789E
DRIVER OUTPUT TRANSITION SKEW
vs. TEMPERATURE
MAX14784E/MAX14787E
PROPAGATION DELAY
toc15
toc16
0.6
0.5
0.4
0.3
0.2
0.1
0.0
DI
5V/div
Y/A
2V/div
VCC = 3.3V
VCC = 5V
Z/B
2V/div
RO
5V/div
LOOPBACK CONFIGURATION
100ns
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Maxim Integrated
│ 10
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
A
CC
MAX14786E/MAX14789E
PROPAGATION DELAY
MAX14784E/MAX14787E
PROPAGATION DELAY
MAX14786E/MAX14789E
PROPAGATION DELAY
toc17
toc18
toc19
DI
5V/div
DI
5V/div
DI
5V/div
Y/A
2V/div
Z/B
2V/div
Z/B
2V/div
Z/B
2V/div
Y/A
2V/div
Y/A
2V/div
RO
5V/div
RO
5V/div
RO
5V/div
LOOPBACK CONFIGURATION
10ns
10ns
100ns
Maxim Integrated
│ 11
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Pin Configurations
TOP VIEW
+
1
2
3
4
5
6
7
14
13
12
11
10
9
N.C.
RO
VCC
N.C.
A
+
VCC
RO
1
2
3
4
8
7
6
5
A
B
Z
Y
RE
MAX14784E
MAX14786E
MAX14787E
MAX14789E
DE
B
DI
Z
DI
GND
GND
Y
GND
8
N.C.
SO
SO/TSSOP
Pin Description
PIN
NAME
FUNCTION
MAX14784E
MAX14786E
MAX14787E
MAX14789E
1, 8, 13
2
—
2
N.C.
RO
No Connection. Not internally connected.
Receiver Output. Drive RE low to enable RO. RO is always active on the MAX14787E
and the MAX14789E. See the Function Tables section.
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.
3
4
—
—
RE
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).
DE
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.
5
3
DI
DE has a weak pullup to V
.
CC
6, 7
9
4
5
6
7
8
1
GND
Ground
Y
Z
B
Noninverting Driver Output
Inverting Driver Output
10
11
12
14
Inverting Receiver Input
Noninverting Receiver Input
A
V
Positive Supply. Bypass V to GND with a 0.1µF capacitor as close as possible to the IC.
CC
CC
Maxim Integrated
│ 12
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Function Tables
TRANSMITTING
INPUTS
OUTPUTS
RE*
X
DE*
1
DI
1
Y
1
0
Z
0
1
X
1
0
0
0
X
X
High-Impedance
Shutdown
1
0
RECEIVING
INPUTS
OUTPUT
RE*
DE*
X
V
- V
RO
A
B
0
0
0
1
1
≥ -10mV
1
X
≤ -200mV
0
1
X
Open/shorted
1
X
X
High-Impedance
Shutdown
0
*RE and DE on the MAX14787E and MAX14789E are internal. The driver outputs and receiver are always active in these devices.
Detailed Description
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 (V - V )
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.
A
B
is greater than or equal to -10mV, RO is logic-high.
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.
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 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.
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.
Maxim Integrated
│ 13
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Half-Duplex Operation
ESD Test Conditions
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.
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.
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).
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.
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.
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.
±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.
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.
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 specified
in IEC 61000-4-2
●
±8kV using the Contact Discharge method specified
in the IEC 61000-4-2
Maxim Integrated
│ 14
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
R
R
D
C
1MΩ
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
1500Ω
I 100%
P
90%
I
r
DISCHARGE
RESISTANCE
CHARGE-CURRENT-
LIMIT RESISTOR
AMPS
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
36.8%
C
100pF
STORAGE
CAPACITOR
s
10%
0
SOURCE
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
Figure 9. Human Body ESD Test Model
Figure 10. Human Body Current Waveform
R
R
C
D
I
50MΩ TO 100MΩ
330Ω
100%
90%
DISCHARGE
RESISTANCE
CHARGE-CURRENT-
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
150pF
STORAGE
CAPACITOR
SOURCE
10%
t = 0.7ns TO 1ns
r
t
30ns
60ns
Figure 11. IEC 61000-4-2 ESD Test Model
Figure 12. IEC 61000-4-2 ESD Generator Current Waveform
Typical Application Circuit
MASTER
SLAVE
A
Y
D
RO
RE
R
DI
Z
B
B
Z
DE
DE
DI
RE
RO
R
D
A
Y
Y
Z
B
A
Y
Z
B
A
MAX14784E
MAX14786E
DI
DE RE RO
DI
DE RE RO
SLAVE
SLAVE
Maxim Integrated
│ 15
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Typical Application Circuit (continued)
A
Y
RO
DI
R
D
D
DI
B
Z
Z
B
R
RO
A
Y
MAX14787E
MAX14789E
Ordering Information/Selector Guide
DRIVER/
RECEIVER
ENABLE
DATA RATE DRIVER SLEW-
DEGLITCHED
PIN-
PACKAGE
PART
TEMP RANGE
(MAX)
RATE LIMITED RECEIVER SIGNAL
MAX14784EASD+
MAX14786EASD+
MAX14786EAUD+
MAX14787EGSA+
MAX14789EGSA+
500kbps
25Mbps
25Mbps
500kbps
25Mbps
Yes
No
Yes
No
Yes
Yes
Yes
No
-40°C to +125°C 14 SO
-40°C to +125°C 14 SO
-40°C to +125°C 14 TSSOP
-40°C to +105°C 8 SO
-40°C to +105°C 8 SO
No
No
Yes
No
Yes
No
No
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
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
14 SO
S8+4
S14+1
U14+1
21-0041
21-0041
21-0066
90-0096
90-0112
90-0113
14 TSSOP
Maxim Integrated
│ 16
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MAX14784E/MAX14786E/
MAX14787E/MAX14789E
Full-Duplex, ±35kV ESD-Protected,
RS-485 Transceivers for
High-Speed Communication
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
12/13
6/14
0
1
2
Initial release
—
1
Removed future product asterisk from MAX14789E
Updated General Description and Benefits and Features sections
1/15
1
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.
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 specifications 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
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