MAX3483E_V01 [MAXIM]
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers;
| 型号： | MAX3483E_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers |
| 文件： | 总19页 (文件大小：2640K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Click here for production status of specific part numbers.
MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
General Description
Features
● ESD Protection for RS-485 I/O Pins
Devices in the MAX3483E family (MAX3483E/MAX3485E/
MAX3486E/MAX3488E/MAX3490E/MAX3491E) are
±15kV ESD-protected, +3.3V, low-power transceivers for
RS-485 and RS-422 communications. Each device con-
tains one driver and one receiver. The MAX3483E and
MAX3488E feature slew-rate-limited drivers that minimize
EMI and reduce reflections caused by improperly termi-
nated cables, allowing error-free data transmission at
data rates up to 250kbps. The partially slew-rate-limited
MAX3486E transmits up to 2.5Mbps. The MAX3485E,
MAX3490E, and MAX3491E transmit at up to 12Mbps.
• ±15kV—Human Body Model
• ±8kV—IEC 1000-4-2, Contact Discharge
• ±15kV—IEC 1000-4-2, Air-Gap Discharge
● Operate from a Single +3.3V Supply—
No Charge Pump Required
● Interoperable with +5V Logic
● Guaranteed 12Mbps Data Rate
(MAX3485E/MAX3490E/MAX3491E)
● Slew-Rate Limited for Errorless Data Transmission
(MAX3483E/MAX3488E)
All devices feature enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap
Discharge, ±8kV using IEC 1000-4-2 Contact Discharge,
and ±15kV using the Human Body Model.
● 2nA Low-Current Shutdown Mode
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
● -7V to +12V Common-Mode Input Voltage Range
● Full-Duplex and Half-Duplex Versions Available
Drivers are short-circuit current limited and are protected
against excessive power dissipation by thermal shutdown
circuitry that places the driver outputs into a high-impedance
state. The receiver input has a fail-safe feature that guar-
antees a logic-high output if both inputs are open circuit.
● Industry-Standard 75176 Pinout
(MAX3483E/MAX3485E/MAX3486E)
● Current-Limiting and Thermal Shutdown for
Driver Overload Protection
The MAX3488E, MAX3490E, and MAX3491E feature full-
duplex communication, while the MAX3483E, MAX3485E,
and MAX3486E are designed for half-duplex communication.
Ordering Information
PART
TEMP. RANGE
0°C to+70°C
PIN-PACKAGE
8 SO
Applications
● Telecommunications
● Industrial-Control Local Area Networks
● Transceivers for EMI-Sensitive Applications
● Integrated Services Digital Networks
● Packet Switching
MAX3483ECSA
MAX3483ECPA
MAX3483EESA
MAX3483EEPA
0°C to+70°C
8 Plastic DIP
8 SO
-40°C to+85°C
-40°C to+85°C
8 Plastic DIP
Ordering Information continued at end of data sheet.
Selector Guide
GUARANTEED
DATA RATE
(Mbps)
SUPPLY
VOLTAGE
(V)
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
±15kV
ESD
PROTECTION
PART
NUMBER
HALF/FULL SLEW-RATE
PIN
COUNT
DUPLEX
LIMITED
MAX3483E
MAX3485E
MAX3486E
MAX3488E
MAX3490E
MAX3491E
0.25
12
Half
Half
Half
Full
Full
Full
Yes
No
Yes
Yes
Yes
No
2
2
Yes
Yes
Yes
Yes
Yes
Yes
8
8
2.5
0.25
12
Yes
Yes
No
2
8
3.0 to 3.6
—
—
2
8
No
8
12
No
Yes
14
19-1474; Rev 1; 5/19
MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Absolute Maximum Ratings
Supply Voltage (V )............................................................+7V
14-Pin SO (derate 8.33mW/°C above +70°C) ................667mW
14-Pin Plastic DIP (derate 10mW/°C above +70°C).......800mW
Operating Temperature Ranges
MAX34_ _ EC_ _................................................0°C to +70°C
MAX34_ _ EE_ _............................................ -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
CC
Control Input Voltage (RE, DE)...............................-0.3V to +7V
Driver Input Voltage (DI)..........................................-0.3V to +7V
Driver Output Voltage (A, B, Y, Z) ......................-7.5V to +12.5V
Receiver Input Voltage (A, B).............................-7.5V to +12.5V
Receiver Output Voltage (RO) ................. -0.3V to (V
+ 0.3V)
CC
Continuous Power Dissipation (T = +70°C)
A
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ..727mW
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 Information
TDFN-14
PACKAGE CODE
S14+1
Outline Number
21-0041
90-0112
Land Pattern Number
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θ
)
120°C/W
37°C/W
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
84°C/W
34°C/W
JA
Junction to Case (θ
)
JC
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 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.
Maxim Integrated
│ 2
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
DC Electrical Characteristics
(V
= +3.3V ±0.3V, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
CC
A
MIN
MAX A
PARAMETER
SYMBOL
CONDITIONS
R = 100Ω (RS-422), Figure 4
MIN
2.0
1.5
1.5
TYP
MAX UNITS
L
Differential Driver Output
V
OD
R = 54Ω (RS-485), Figure 4
V
L
R = 60Ω (RS-485), V
= 3.3V, Figure 5
L
CC
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
(Note 1)
∆V
R = 54Ω or 100Ω, Figure 4
0.2
V
OD
L
Driver Common-Mode Output
Voltage
V
R = 54Ω or 100Ω, Figure 4
3
V
V
OC
L
Change in Magnitude of
Common-Mode Output Voltage
(Note 1)
∆V
R = 54Ω or 100Ω, Figure 4
0.2
OC
L
Input High Voltage
Input Low Voltage
Logic Input Current
V
DE, DI, RE
DE, DI, RE
DE, DI, RE
2.0
V
V
IH
V
0.8
±2
IL
I
μA
IN1
V
V
V
V
V
V
= 12V
= -7V
1.0
-0.8
20
-20
1
DE = 0V,
IN
Input Current (A, B)
I
mA
μA
μA
V
IN2
V
= 0V or 3.6V
CC
IN
= 12V
= -7V
= 12V
= -7V
DE = 0V, RE = 0V,
= 0V or 3.6V, MAX3491E
OUT
OUT
OUT
OUT
Output Leakage (Y, Z)
I
I
O
V
CC
Output Leakage (Y, Z)
in Shutdown Mode
DE = 0V, RE = V
,
CC
O
V
= 0V or 3.6V, MAX3491E
-1
CC
Receiver Differential Threshold
Voltage
V
-7V ≤ V
≤ 12V
-0.2
0.2
TH
CM
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
∆V
V
= 0V
50
mV
V
TH
CM
OUT
OUT
V
I
I
= -1.5mA, V = 200mV, Figure 6
V
- 0.4
OH
ID
CC
V
OL
= 2.5mA, V = 200mV, Figure 6
0.4
±1
V
ID
Three-State (High Impedance)
Output Current at Receiver
I
V
= 3.6V, 0V ≤ V
≤ V
CC
μA
OZR
CC
OUT
Receiver Input Resistance
Supply Voltage Range
R
-7V ≤ V
≤ 12V
12
kΩ
IN
CM
V
CC
3.0
3.6
V
Maxim Integrated
│ 3
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
DC Electrical Characteristics (continued)
(V
= +3.3V ±0.3V, T = T
A
to T
, unless otherwise noted. Typical values are at T = +25°C)
MAX A
CC
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.1
MAX UNITS
DE = V , RE = 0 or V
2.2
mA
1.9
No load,
DI = 0 or V
CC
CC
Supply Current
I
CC
DE = 0V, RE = 0
0.95
0.002
CC
Supply Current in Shutdown Mode
I
DE = 0, RE = V , DI = V or 0
CC
1
µA
SHDN
CC
V
= -7V
-250
250
Driver Short-Circuit Output
Current
OUT
OUT
I
mA
OSD
OSR
V
= 12V
Receiver Short-Circuit Output
Current
I
0 ≤ V
≤ V
±8
±60
mA
kV
RO
CC
IEC 1000-4-2 Air Discharge
±15
±8
IEC 1000-4-2 Contact Discharge (MAX3483E,
MAX3485E, MAX3486E, MAX3491E)
ESD Protection for Y, Z, A, B
IEC 1000-4-2 Contact Discharge (MAX3490E,
MAX3488E)*
±6
Human Body Model
±15
*MAX3488E and MAX3491E will be compliant to ±8kV per IEC 1000-4-2 Contact Discharge by September 1999.
Driver Switching Characteristics—MAX3485E/MAX3490E/MAX3491E
(V
= +3.3V, T = +25°C.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
12
1
TYP
15
MAX UNITS
Maximum Data Rate
Mbps
Driver Differential Output Delay
t
R = 60Ω, Figure 7
22
35
25
35
35
±8
ns
ns
ns
ns
ns
DD
L
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
t
R = 60Ω, Figure 7
3
11
TD
L
t
R = 27Ω, Figure 8
7
23
PLH
L
t
R = 27Ω, Figure 8
7
23
PHL
L
|t
- t
| Driver Propagation Delay Skew (Note 2)
t
R = 27Ω, Figure 8
-1.4
PLH PHL
PDS
L
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3485E/MAX3491E only)
Driver
Driver
Driver
Driver
Driver
Driver
-
-
-
-
-
-
Output Enable Time to Low Level
t
R = 110Ω, Figure 10
42
42
90
90
ns
ns
ns
ns
ns
ns
PZL
L
Output Enable Time to High Level
t
t
R = 110Ω, Figure 9
L
PZH
PHZ
Output Disable Time from High Level
Output Disable Time from Low Level
Output Enable Time from Shutdown to Low Level
Output Enable Time from Shutdown to High Level
R = 110Ω, Figure 9
35
80
L
t
R = 110Ω, Figure 10
35
80
PLZ
PSL
PSH
L
t
R = 110Ω, Figure 10
650
650
900
900
L
t
R = 110Ω, Figure 9
L
Maxim Integrated
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Driver Switching Characteristics—MAX3486E
(V
= +3.3V, T = +25°C.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
2.5
20
TYP
MAX UNITS
Maximum Data Rate
Mbps
Driver Differential Output Delay
t
R = 60Ω, Figure 7
42
28
42
42
-6
70
60
ns
ns
ns
ns
ns
DD
L
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
t
R = 60Ω, Figure 7
15
TD
L
t
R = 27Ω, Figure 8
20
75
PLH
L
t
R = 27Ω, Figure 8
20
75
PHL
PDS
L
|t
- t
| Driver Propagation Delay Skew (Note 2)
t
R = 27Ω, Figure 8
±12
PLH PHL
L
DRIVER-OUTPUT ENABLE/DISABLE TIMES
Driver Output Enable Time to Low Level
t
R = 110Ω, Figure 10
52
52
100
100
80
ns
ns
ns
ns
ns
ns
PZL
PZH
PHZ
L
Driver Output Enable Time to High Level
t
t
R = 110Ω, Figure 9
L
Driver Output Disable Time from High Level
Driver Output Disable Time from Low Level
Driver Output Enable Time from Shutdown to Low Level
Driver Output Enable Time from Shutdown to High Level
R = 110Ω, Figure 9
40
L
t
R = 110Ω, Figure 10
40
80
PLZ
PSL
PSH
L
t
R = 110Ω, Figure 10
700
700
1000
1000
L
t
R = 110Ω, Figure 9
L
Driver Switching Characteristics—MAX3483E/MAX3488E
(V
= +3.3V, T = +25°C)
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
250
600
400
700
700
TYP
MAX UNITS
Maximum Data Rate
kbps
Driver Differential Output Delay
t
R = 60Ω, Figure 7
900
740
930
930
±50
1400
1200
1500
1500
ns
ns
ns
ns
ns
DD
L
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
t
R = 60Ω, Figure 7
L
TD
t
R = 27Ω, Figure 8
L
PLH
t
R = 27Ω, Figure 8
L
PHL
|t
- t
| Driver Propagation Delay Skew (Note 2)
t
R = 27Ω, Figure 8
L
PLH PHL
PDS
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3483E only)
Driver-Output Enable Time to Low Level
t
R = 110Ω, Figure 10
900
600
50
1300
800
80
ns
ns
ns
ns
µs
µs
PZL
L
Driver-Output Enable Time to High Level
t
t
R = 110Ω, Figure 9
L
PZH
PHZ
Driver-Output Disable Time from High Level
Driver-Output Disable Time from Low Level
Driver-Output Enable Time from Shutdown to Low Level
Driver-Output Enable Time from Shutdown to High Level
R = 110Ω, Figure 9
L
t
R = 110Ω, Figure 10
50
80
PLZ
PSL
PSH
L
t
R = 110Ω, Figure 10
1.9
2.2
2.7
3.0
L
t
R = 110Ω, Figure 9
L
Maxim Integrated
│ 5
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Receiver Switching Characteristics
(V
= +3.3V, T = +25°C)
A
CC
PARAMETER
SYMBOL
t
CONDITIONS
MIN
TYP
MAX UNITS
MAX3483E/MAX3485E/MAX3486E/MAX3491E
only (Note 3)
Time to Shutdown
80
190
300
ns
ns
SHDN
V
= 0 to 3.0, C = 15pF, Figure 11
25
25
25
25
62
75
62
75
6
90
120
90
Receiver Propagation Delay,
Low-to-High Level
ID
L
t
RPLH
MAX3483E/MAX3488E
= 0 to 3.0, C = 15pF, Figure 11
V
Receiver Propagation Delay,
High-to-Low Level
ID
L
t
ns
ns
RPHL
RPDS
MAX3483E/MAX3488E
= 0 to 3.0, C = 15pF, Figure 11
120
±10
±20
V
|t
- t
| Receiver
ID
L
PLH PHL
t
Propagation Delay Skew
MAX3483E/MAX3488E
12
Receiver Output Enable Time
to Low Level
C = 15pF, Figure 12,
L
MAX3483E/85E/86E/91E only
t
25
25
50
50
ns
ns
ns
ns
ns
ns
PRZL
PRZH
PRHZ
Receiver Output Enable Time
to High Level
C = 15pF, Figure 12,
L
MAX3483E/85E/86E/91E only
t
t
Receiver Output Disable
Time from High Level
C = 15pF, Figure 12,
L
MAX3483E/85E/86E/91E only
25
45
Receiver Output Disable
Time from Low Level
C = 15pF, Figure 12,
L
MAX3483E/85E/86E/91E only
t
25
45
PRLZ
PRSL
PRSH
Receiver Output Enable Time
from Shutdown to Low Level
C = 15pF, Figure 12,
L
MAX3483E/85E/86E/91E only
t
720
720
1400
1400
Receiver Output Enable Time
from Shutdown to High Level
C = 15pF, Figure 12,
L
MAX3483E/85E/86E/91E only
t
Note 1: ∆V
and ∆V
are the changes in V
and V , respectively, when the DI input changes state.
OD
OC
OD OC
Note 2: Measured on |t
(Y) - t
(Y)| and |t
(Z) - t
(Z)|.
PLH
PHL
PLH
PHL
Note 3: The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns,
the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to
have entered shutdown. See Low-Power Shutdown Mode section.
Maxim Integrated
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Typical Operating Characteristics
(V
= +3.3V, T = +25°C, unless otherwise noted.)
A
CC
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
TOC03
TOC01
TOC02
25
-20
-18
-16
-14
-12
-10
-8
3.30
3.25
I
= 1.5mA
RO
20
3.20
3.15
15
10
5
3.10
3.05
3.00
-6
-4
-2
0
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT LOW VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
RECEIVER OUTPUT LOW VOLTAGE
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs.TEMPERATURE
vs. TEMPERATURE
TOC05
TOC04
TOC06
100
90
80
70
60
50
40
30
0.8
0.7
0.6
0.5
2.6
2.5
I
= 2.5mA
R = 54Ω
RO
2.4
2.3
2.2
2.1
0.4
0.3
0.2
0.1
0
2.0
1.9
1.8
1.7
1.6
20
10
0
-40 -20
0
20
40
60
80 100
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
TOC07
TOC08
175
-100
-80
150
125
100
75
-60
-40
-20
0
50
25
0
0
2
4
6
8
10
12
0
1
2
3
4
5
-7 -6 -5 -4 -3 -2 -1
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Typical Operating Characteristics (continued)
(V
= +3.3V, T = +25°C, unless otherwise noted.)
A
CC
SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN CURRENT
vs. TEMPERATURE
TOC10
TOC09
1.2
1.1
1.0
0.9
100
X = DON’T CARE
90
80
70
60
DE = V , RE = X
CC
50
DE = 0, RE = 0
40
30
20
10
0
0.8
0.7
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Pin Description
PIN
MAX3483E
MAX3485E
MAX3486E
NAME
FUNCTION
MAX3488E
MAX3490E
MAX3491E
Receiver Output. If A > B by 200mV, RO will be high; if A < B by 200mV, RO
will be low.
1
2
2
2
3
RO
Receiver Output Enable. RO is enabled when RE is low; RO is high
impedance when RE is high. If RE is high and DE is low, the device will
enter a low-power shutdown mode.
—
RE
Driver Output Enable. The driver outputs are enabled by bringing DE high.
They are high impedance when DE is low. If RE is high and DE is low, the
device will enter a low-power shutdown mode. If the driver outputs are
enabled, the parts function as line drivers. While they are high impedance,
they function as line receivers if RE is low.
3
4
—
3
4
5
DE
DI
Driver Input. A low on DI forces output Y low and output Z high. Similarly, a
high on DI forces output Y high and output Z low.
5
—
—
6
4
5
6, 7
9
GND
Y
Ground
Noninverting Driver Output
6
10
Z
Inverting Driver Output
—
8
—
A
Noninverting Receiver Input and Noninverting Driver Output
Noninverting Receiver Input
—
7
12
A
—
7
—
B
Inverting Receiver Input and Inverting Driver Output
Inverting Receiver Input
—
8
11
B
1
13, 14
1, 8
V
Positive Supply: 3.0V ≤ V
≤ 3.6V. Do not operate device with V
> 3.6V
CC
CC
CC
—
—
N.C.
No Connection. Not internally connected.
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
TOP VIEW
MAX3483E
MAX3485E
MAX3486E
DE
R
R
RO
RE
DE
DI
1
2
3
4
RO
RE
DE
DI
1
2
3
4
8
8
7
6
5
V
V
D
CC
DI
CC
B
B
A
7
B
Rt
Rt
6
A
A
RO
R
D
D
5
GND
GND
RE
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.
SO/DIP
Figure 1. MAX3483E/MAX3485E/MAX3486E Pin Configuration and Typical Operating Circuit
V
CC
V
TOP VIEW
CC
1
MAX3488E
MAX3490E
Y
Z
5
6
3
2
Rt
DI
RO
DI
D
R
V
1
2
3
4
R
8
7
6
5
A
B
Z
Y
CC
RO
DI
8
7
A
B
Rt
RO
R
D
GND
D
SO/DIP
4
GND
GND
Figure 2. MAX3488E/MAX3490E Pin Configuration and Typical Operating Circuit
DE
V
V
RE
CC
TOP VIEW
CC
MAX3491E
4
13, 14
N.C.
1
2
3
4
5
6
7
14
13
12
11
10
9
V
V
CC
CC
9
Y
R
5
Rt
RO
RE
RO
DI
DI
D
R
10
A
B
Z
Y
Z
A
DE
12
11
DI
2
Rt
RO
R
D
D
GND
GND
B
8
N.C.
1, 8
N.C.
3
6, 7
SO/DIP
RE GND
GND DE
Figure 3. MAX3491E Pin Configuration and Typical Operating Circuit
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MAX3483E/MAX3485E/
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3.3V-Powered, ±15kV ESD-Protected,
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True RS-485/RS-422 Transceivers
375Ω
R
L
2
V
=
CM
V
OD
D
-7V to +12V
R
L
V
OD
D
R
L
V
OC
V
CC
2
V
CC
375Ω
Figure 4. Driver V
and V
Figure 5. Driver V
with Varying Common-Mode Voltage
OD
OD
OC
V
ID
R
0V
V
OL
V
OH
I
OL
I
OH
(+)
(-)
Figure 6. Receiver V
and V
OH
OL
3V
0V
IN
1.5V
1.5V
DO
C
C
L
OUT
D
R =
L
60Ω
t
t
DO
GENERATOR
(NOTE 4)
50Ω
≈ 2.0V
90%
90%
V
CC
50%
10%
50%
10%
OUT
L
≈ -2.0V
C = 15pF (NOTE 5)
L
t
t
TD
TD
Figure 7. Driver Differential Output Delay and Transition Times
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3.3V-Powered, ±15kV ESD-Protected,
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True RS-485/RS-422 Transceivers
3V
V
OM
IN
1.5V
1.5V
PLH
R = 27Ω
L
0V
S1
t
t
t
t
PHL
OUT
D
V
OH
OL
GENERATOR
Y
OUT
(NOTE 4)
50Ω
C = 15pF
L
V
V
V
OM
OM
(NOTE 5)
V
CC
V
PHL
PLH
V
OH
+ V
V
OM
=
OL ≈ 1.5V
2
V
V
OH
Z
OUT
V
OM
OM
OL
Figure 8. Driver Propagation Times
3V
S1
OUT
0V OR 3V
D
IN
1.5V
1.5V
0V
V
R = 110Ω
L
C = 50pF
(NOTE 5)
L
t
t
PHZ
PZH
GENERATOR
(NOTE 4)
OH
50Ω
0.25V
OUT
V
OM
V
OH
+ V
V
OM
=
OL ≈ 1.5V
0V
2
Figure 9. Driver Enable and Disable Times (t
, t
, t
)
PZH PSH PHZ
V
CC
3V
R = 110Ω
L
IN
1.5V
1.5V
S1
0V
0V OR 3V
OUT
D
t
t
PLZ
PSL
C = 50pF
L
(NOTE 5)
V
CC
OL
GENERATOR
(NOTE 4)
OUT
V
OM
50Ω
0.25V
V
Figure 10. Driver Enable and Disable Times (t
, t
, t
)
PZL PSL PLZ
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MAX3483E/MAX3485E/
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3.3V-Powered, ±15kV ESD-Protected,
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True RS-485/RS-422 Transceivers
3.0V
OUT
V
ID
R
IN
1.5V
1.5V
GENERATOR
(NOTE 4)
50Ω
C = 15pF
L
0V
(NOTE 5)
t
t
RPHL
RPLH
V
CC
1.5V
0V
V
OM
V
OM
OUT
V
CC
2
V
OM
=
0V
Figure 11. Receiver Propagation Delay
S1
S3
1.5V
1k
V
CC
-1.5V
V
ID
R
S2
C
L
(NOTE 5)
GENERATOR
(NOTE 4)
50Ω
3V
0V
3V
S1 OPEN
S2 CLOSED
S3 = 1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
IN
IN
1.5V
1.5V
0V
t
t
t
t
PRZH
PRSH
PRZL
PRSL
V
V
OH
CC
OL
OUT
OUT
1.5V
1.5V
0V
V
3V
0V
3V
0V
S1 OPEN
S2 CLOSED
S3 = 1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
IN
1.5V
IN
1.5V
t
PRHZ
t
PRLZ
V
V
OH
CC
OL
OUT
0.25V
0.25V
OUT
0V
V
Figure 12. Receiver Enable and Disable Times
Note 4: The input pulse is supplied by a generator with the following characteristics: f = 250kHz, 50% duty cycle, t ≤ 6.0ns, Z = 50Ω.
r
O
Note 5: C includes probe and stray capacitance.
L
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Function Tables
Applications Information
The MAX3483E/MAX3485E/MAX3486E/MAX3488E/
MAX3490E/MAX3491E are low-power transceivers for
RS-485 and RS-422 communications. The MAX3483E
and MAX3488E can transmit and receive at data rates
up to 250kbps, the MAX3486E at up to 2.5Mbps, and the
MAX3485E/MAX3490E/MAX3491E at up to 12Mbps. The
MAX3488E/MAX3490E/MAX3491E are full-duplex trans-
ceivers, while the MAX3483E/MAX3485E/MAX3486E
are half-duplex. Driver Enable (DE) and Receiver Enable
(RE) pins are included on the MAX3483E/MAX3485E/
MAX3486E/MAX3491E. When disabled, the driver and
receiver outputs are high impedance.
Devices with Receiver/Driver Enable
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
Table 1. Transmitting
INPUTS
OUTPUTS
MODE
RE
X
DE
1
DI
1
B*
A*
1
0
Normal
Normal
X
1
0
1
0
0
0
X
X
High-Z
High-Z
High-Z
High-Z
Normal
1
0
Shutdown
* B and A outputs are Z and Y, respectively, for full-duplex part
(MAX3491E).
X = Don’t care; High-Z = High impedance
Reduced EMI and Reflections
(MAX3483E/MAX3486E/MAX3488E)
The MAX3483E/MAX3488E are slew-rate limited, mini-
mizing EMI and reducing reflections caused by improp-
erly terminated cables. Figure 13 shows the driver output
waveform of a MAX3485E/MAX3490E/MAX3491E trans-
mitting a 125kHz signal, as well as the Fourier analysis
of that waveform. High-frequency harmonics with large
amplitudes are evident. Figure 14 shows the same
information, but for the slew-rate-limited MAX3483E/
MAX3488E transmitting the same signal. The high-fre-
quency harmonics have much lower amplitudes, and the
potential for EMI is significantly reduced.
Table 2. Receiving
INPUTS
DE
OUTPUTS
MODE
RE
0
A, B
≥ +0.2V
≤ -0.2V
Inputs Open
X
RO
0*
0*
0*
0
1
Normal
Normal
0
0
1
0
Normal
1
High-Z
Shutdown
* DE is a “don’t care” (x) for the full-duplex part (MAX3491E).
X = Don’t care; High-Z = High impedance
Low-Power Shutdown Mode
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
Devices without Receiver/Driver Enable
(MAX3488E/MAX3490E)
A low-power shutdown mode is initiated by bringing both
RE high and DE low. The devices will not shut down
unless both the driver and receiver are disabled (high
impedance). In shutdown, the devices typically draw only
2nA of supply current.
Table 3. Transmitting Table 4. Receiving
INPUT
OUTPUTS
INPUTS
A, B
OUTPUT
DI
1
Z
Y
1
0
RO
1
For these devices, the t
and t
enable times
PSH
PSL
0
1
≥ +0.2V
≤ -0.2V
assume the part was in the low-power shutdown mode;
the t and t enable times assume the receiver or
0
0
PZH
PZL
Inputs Open
1
driver was disabled, but the part was not shut down.
10dB/div
10dB/div
0
500kHz/div
5MHz
0
500kHz/div
5MHz
Figure 13. Driver Output Waveform and FFT Plot of MAX3485E/
MAX3490E/MAX3491E Transmitting a 125kHz Signal
Figure 14. Driver Output Waveform and FFT Plot of
MAX3483E/ MAX3488E Transmitting a 125kHz Signal
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MAX3486E/MAX3488E/
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3.3V-Powered, ±15kV ESD-Protected,
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True RS-485/RS-422 Transceivers
B
1V/div
DI
2V/div
A
1V/div
Z
1V/div
RO
Y
2V/div
1V/div
20ns/div
20ns/div
Figure 15. MAX3485E/MAX3490E/MAX3491E Driver
Propagation Delay
Figure 16. MAX3485E/MAX3490E/MAX3491E Receiver
Propagation Delay Driven by External RS-485 Device
B
1V/div
DI
2V/div
A
1V/div
Z
1V/div
Y
RO
2V/div
1V/div
1µs/div
1µs/div
Figure 17. MAX3483E/MAX3488E Driver Propagation Delay
Figure 18. MAX3483E/MAX3488E Receiver Propagation Delay
DI
DI
5V/div
5V/div
V - V
V - V
Y
Z
Y
Z
2V/div
2V/div
RO
RO
5V/div
5V/div
2µs/div
2µs/div
Figure 19. MAX3483E/MAX3488E System Differential Voltage
at 125kHz Driving 4000 Feet of Cable
Figure 20. MAX3485E/MAX3490E/MAX3491E System
Differential Voltage at 125kHz Driving 4000 Feet of Cable
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MAX3486E/MAX3488E/
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3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Driver Output Protection
±15kV ESD Protection
Excessive output current and power dissipation caused
by faults or by bus contention are prevented by two
mechanisms. A foldback current limit on the output stage
provides immediate protection against short circuits over
the whole common-mode voltage range (see Typical
Operating Characteristics). In addition, a thermal shut-
down circuit forces the driver outputs into a high-imped-
ance state if the die temperature rises excessively.
As with all Maxim devices, 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 MAX3483E
family of devices have extra protection against static
electricity. Maxim’s engineers have developed state-of-
the-art structures to protect these pins against ESD of
±15kV without damage. The ESD structures withstand
high ESD in all states: normal operation, shutdown, and
powered down. After an ESD event, Maxim’s E versions
keep working without latchup or damage.
Propagation Delay
Figures 15–18 show the typical propagation delays. Skew
time is simply the difference between the low-to-high and
high-to-low propagation delay. Small driver/receiver skew
times help maintain a symmetrical mark-space ratio (50%
duty cycle).
ESD protection can be tested in various ways; the trans-
mitter outputs and receiver inputs of this product family
are characterized for protection to the following limits:
1) ±15kV using the Human Body Model
The receiver skew time, |t
- t
PRHL
|, is under 10ns
PRLH
2) ±8kV using the Contact-Discharge method specified
20ns for the MAX3483E/MAX3488E). The driver skew
times are 8ns for the MAX3485E/MAX3490E/MAX3491E,
12ns for the MAX3486E, and typically under 50ns for the
MAX3483E/MAX3488E.
in IEC 1000-4-2
3) ±15kV using IEC 1000-4-2’s Air-Gap method.
ESD Test Conditions
Line Length vs. Data Rate
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, see
Figure 21 for an example of a line repeater.
Human Body Model
Figures 19 and 20 show the system differential voltage
for parts driving 4000 feet of 26AWG twisted-pair wire at
125kHz into 120Ω loads.
Figure 22a shows the Human Body Model and Figure
22b shows the current waveform it generates when dis-
charged 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
1.5kΩ resistor.
For faster data rate transmission, please consult the factory.
IEC 1000-4-2
MAX3488E
MAX3490E
MAX3491E
A
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to integrated circuits. The MAX3483E family of
devices helps you design equipment that meets Level 4
(the highest level) of IEC 1000-4-2, without the need for
additional ESD-protection components.
120Ω
RO
RE
DE
R
DATA IN
B
Z
Y
DI
120Ω
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak cur-
rent in IEC 1000-4-2, because series resistance is lower
in the IEC 1000-4-2 model. Hence, the ESD withstand
voltage measured to IEC 1000-4-2 is generally lower than
that measured using the Human Body Model. Figure 23a
shows the IEC 1000-4-2 model, and Figure 23b shows
the current waveform for the ±8kV IEC 1000-4-2, Level 4
ESD contact-discharge test. test.
DATA OUT
D
NOTE: RE AND DE ON MAX3491 ONLY.
Figure 21. Line Repeater for MAX3488E/MAX3490E/MAX3491E
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3.3V-Powered, ±15kV ESD-Protected,
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True RS-485/RS-422 Transceivers
RC
1M
RD
3722²
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
IP 100%
90%
Ir
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
AMPERES
HIGH-
VOLTAGE
DC
36.8%
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
CS
100pF
10%
0
SOURCE
0
TIME
tRL
tDL
CURRENT WAVEFORM
Figure 22a. Human Body ESD Test Model
Figure 22b. Human Body Current Waveform
I
RC
RD
552²
100%
90%
50M TO 100M
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
CS
150pF
10%
SOURCE
t
tR = 0.7ns
TO 1ns
30ns
60ns
Figure 23a. IEC 1000-4-2 ESD Test Model
Figure 23b. IEC 1000-4-2 ESD Generator Current Waveform
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method connects
the probe to the device before the probe is energized.
Typical Applications
The MAX3483E/MAX3485E/MAX3486E/MAX3488E/
MAX3490E/MAX3491E transceivers are designed for
bidirectional data communications on multipoint bus
transmission lines. Figures 24 and 25 show typical net-
work applications circuits. These parts can also be used
as line repeaters, with cable lengths longer than 4000
feet, as shown in Figure 21.
Machine Model
The Machine Model for ESD tests all pins using a 200pF
storage capacitor and zero discharge resistance. Its
objective is to emulate the stress caused when I/O pins
are contacted by handling equipment during test and
assembly. Of course, all pins require this protection, not
just RS-485 inputs and outputs.
To minimize reflections, the line should be terminated
at both ends in its characteristic impedance, and stub
lengths off the main line should be kept as short as
possible. The slew-rate-limited MAX3483E/MAX3488E
and the partially slew-rate-limited MAX3486E are more
tolerant of imperfect termination.
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
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True RS-485/RS-422 Transceivers
120Ω
120Ω
DE
B
A
B
DI
D
D
DI
DE
B
A
B
A
A
RO
RO
R
R
RE
RE
R
R
D
D
MAX3483E
MAX3485E
MAX3486E
DI
DE RO RE
DI
DE RO RE
Figure 24. MAX3483E/MAX3485E/MAX3486E Typical RS-485 Network
A
Y
120Ω
120Ω
RO
RE
R
DI
D
B
Z
Z
B
DE
DE
RE
RO
120Ω
120Ω
DI
R
D
Y
A
Y
Z
B
A
Y
Z
B
A
R
R
MAX3488E
MAX3490E
MAX3491E
D
D
DI
DE RERO
DI
DE RERO
NOTE: RE AND DE ON MAX3491 ONLY.
Figure 25. MAX3488E/MAX3490E/MAX3491E Full-Duplex RS-485 Network
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MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Ordering Information (continued)
Chip Information
TRANSISTOR COUNT: 761
PART
TEMP. RANGE
0°C to+70°C
PIN-PACKAGE
8 SO
MAX3485ECSA
MAX3485ECPA
MAX3485EESA
MAX3485EEPA
MAX3486ECSA
MAX3486ECPA
MAX3486EESA
MAX3486EEPA
MAX3488ECSA
MAX3488ECPA
MAX3488EESA
MAX3488EEPA
MAX3490ECSA
MAX3490ECPA
MAX3490EESA
MAX3490EEPA
MAX3491ECSD
MAX3491ECPD
MAX3491EESD
MAX3491EEPD
0°C to+70°C
8 Plastic DIP
8 SO
-40°C to+85°C
-40°C to+85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
14 SO
14 Plastic DIP
14 SO
14 Plastic DIP
Maxim Integrated
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MAX3483E/MAX3485E/
MAX3486E/MAX3488E/
MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected,
12Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
1
4/99
Initial release
—
2
5/19
Updated Absolute Maximum Ratings and Package Information section
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
2019 Maxim Integrated Products, Inc.
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MAX3485E
3.3V Powered.±.15kV ESD-Protected.12Mbps.Slew-Rate-Limited True RS-485/RS-422 Transceivers
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