EVALUATION KIT AVAILABLE
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
General Description
Benefits and Features
The MAX3160E/MAX3161E/MAX3162E are programmable RS-232/RS-485/RS-422 multiprotocol transceivers.
The MAX3160E/MAX3161E are pin programmable as a
2Tx/2Rx RS-232 interface or a single RS-485/RS-422
transceiver. The MAX3162E is configured as a 2Tx/2Rx
RS-232 interface, and a single RS-485/RS-422 transceiver simultaneously.
• Flexible Options for RS-232 and RS-422/485
The MAX3160E/MAX3161E/MAX3162E feature
enhanced electrostatic discharge (ESD) protection. All
of the transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model.
All devices incorporate a proprietary low-dropout transmitter output stage, and an on-board dual charge
pump to allow RS-232- and RS-485-/RS-422-compliant
performance from a +3V to +5.5V supply. These
devices also feature pin-selectable transmitter slew
rates for RS-232 and RS-485/RS-422 modes. Slew-rate
limiting minimizes EMI and reduces reflections caused
by improperly terminated cables, allowing error-free
data transmission up to 250kbps. Disabling slew-rate
limiting allows these devices to transmit at data rates
up to 10Mbps in RS-485/RS-422 mode and up to
1Mbps in RS-232 mode.
•
The MAX3160E/MAX3162E offer a flow-through pinout that facilitates board layout. The MAX3160E/
MAX3161E/MAX3162E are available in tiny SSOP packages and operate up to -40°C to +85°C temperature
ranges.
•
•
•
Operation In One Package
• Simultaneous 2Tx/2Rx RS-232 and Half-Duplex
RS-485 Transceiver Operation (MAX3162E)
• Pin-Programmable As Either 2Tx/2Rx RS-232 or
Half/Full RS-485 Transceiver (MAX3160E,
MAX3161E)
Integrated Protection Increases Robustness
• High ±15kV ESD HBM per JEDEC JS-001-2012
• Transmitters and Receivers Protected Against
Wiring Faults
• True Fail-Safe Receiver Prevents False Transition
on Receiver Input Short or Open
• Short-Circuit Protection Over the Entire CommonMode Voltage Range
• Thermal Protection from Excessive Power
Dissipation
• Slew Rate Limiting Minimizes EM and Reduces
Cable Reflections
Integrated Charge Pump Circuitry Saves Board
Space
• Eliminates the Need for a Bipolar ±12V Supply
• Enables Single Supply Operation From +3V to
+5.5V Voltage Supply
1µA Shutdown Supply Current Saves Power
Allows Up To 256 Transceivers on the Bus
Typical Operating Circuit
Applications
Point-of-Sales Equipment
Peripherals
Industrial Controls
Networking
RS-232 to RS-485
Interface Converters
Security Systems
+3V TO +5.5V
2
VCC
RS-485/RS232
11
MAX3160E
TX
13
RTS
MAX3100 11
RX
DI/T1IN
15
12
8
10
7
CTS
Z(B)/T1OUT
16
DE485/T2IN Y(A)/T2OUT
RO/R2OUT
A/R2IN
R1OUT
B/R1IN
5
6
DB9
13
14
GND FAST HDPLX SHDN
SPI
Ordering Information appears at end of data sheet.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
19-3580; Rev 1; 5/15
µP
4
SHDN
10
12
9
RJ45
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
Absolute Maximum Ratings
Output Short-Circuit Duration
T1OUT, T2OUT, Y, Z ..............................................Continuous
Continuous Power Dissipation (TA = +70°C)
20-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW
24-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW
28-Pin SSOP (derate 9.1mW/°C above +70°C) ...........727mW
Operating Temperature Ranges
MAX316_CA_ ......................................................0°C to +70°C
MAX316_EA_ ...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
VCC to GND. .............................................................-0.3V to +6V
V+ to GND ................................................................-0.3V to +7V
V- to GND. ................................................................-7V to +0.3V
V+ - V- (Note 1)....................................................................+13V
Input Voltages
T1IN, T2IN, DI, DE485, RE485, TE232, RE232, SHDN,
FAST, HDPLX, RS485/RS232 to GND. .................-0.3V to +6V
A, B, R1IN, R2IN to GND .................................................±25V
Output Voltages
T1OUT, T2OUT, Y, Z to GND (VCC = 0 or
SHDN = GND) ..............................................................±13.2V
T1OUT, T2OUT to GND (VCC = 5.5V and
SHDN = VCC) .....................................................-13.2V to +9V
R2OUT, R1OUT, RO to GND..................-0.3V to (VCC + 0.3V)
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
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.
Electrical Characteristics (continued)
(VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;
TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2)
PARAMETER
DC CHARACTERISTICS
VCC Standby Current
SYMBOL
ICC
CONDITIONS
MIN
TYP
MAX
MAX3160E/MAX3161E, no load,
RS-485/ RS-232 = GND
1.2
2.8
MAX3160E/MAX3161E, no load,
RS-485/ RS-232 = VCC
2.5
5.5
3
6
0.01
1
MAX3162E, no load
VCC Shutdown Current
ISHDN
SHDN = GND, receiver inputs open or
grounded
UNITS
mA
µA
TRANSMITTER AND LOGIC INPUTS (DI, T1IN, T2IN, DE485, R E 4 8 5 , TE232, R E 2 32 , FAST, HDPLX, SHDN, RS-485/ R S- 232 )
Logic-Input Low
Logic-Input High
VIL
VIH
0.8
VCC = +3.3V
2.0
VCC = +5V
2.4
V
V
Logic-Input Leakage Current
IINL
±0.01
Transmitter Logic Hysteresis
VHYS
0.5
±1
µA
V
RS-232 AND RS-485/RS-422 RECEIVER OUTPUTS (R1OUT, R2OUT, RO)
Receiver Output-Voltage Low
VOL
IOUT = 2.5mA
Receiver Output-Voltage High
VOH
IOUT = -1.5mA
Receiver Output Short-Circuit
Current
IOSR
0 ≤ VO ≤ VCC
Receiver Output Leakage
Current
IOZR
Receivers disabled
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0.4
VCC - 0.6
V
V
±20
±85
mA
±0.05
±1
µA
Maxim Integrated | 2
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
Electrical Characteristics (continued)
(VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;
TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
RS-232 RECEIVER INPUTS (R1IN, R2IN)
CONDITIONS
MIN
Input Voltage Range
TYP
-25
Logic-Input Low
MAX
UNITS
+25
V
0.8
Logic-input High
VCC = +3.3V
2.0
VCC = +5V
2.4
Input Hysteresis
V
0.5
Input Resistance
V
VCC = +3.0V to 5.5V
3
5
7
VCC = 0
6
11
16
kΩ
RS-485/RS-422 RECEIVER INPUTS (Note 3)
Input Resistance
RIN
-7V < VCM < +12V
MAX3160E
Input Current
IIN
MAX3161E/MAX3162E
Input Differential Threshold
Input Hysteresis
VTH
MAX3160E
48
MAX3161E/
MAX3162E
96
kΩ
VCM = +12V
0.25
VCM = -7V
-0.15
VCM = +12V
0.125
VCM = -7V
-7V ≤ VCM ≤ +12V
-0.075
-50
-200
ΔVTH
mA
mV
30
mV
V
RS-232 TRANSMITTER OUTPUTS (T1OUT, T2OUT)
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
Both transmitter outputs loaded with 3kΩ
to GND
±5
±5.4
VCC = V+ = V- = 0, T_OUT = ±2V
300
10M
ISC
T_OUT = GND
IO
VOUT = ±9V
TE232 = GND or SHDN =
GND
±30
Ω
±60
MAX3160E
±125
MAX3161E
±25
MAX3162E
±25
mA
µA
RS-485/RS-422 TRANSMITTER OUTPUTS (Y, Z)
Differential Output Voltage
VOD
R = 27Ω
(RS-485)
1.5
R = 50Ω
(RS-422)
2
Figure 1
V
Change in Magnitude of
Differential Output Voltage for
Complementary Output States
|ΔVOD|
R = 27Ω or 50Ω, Figure 1
0.2
V
Common-Mode Output Voltage
VOC
R = 27Ω or 50Ω, Figure 1
3
V
Change in Magnitude of
Common-Mode Output Voltage
for Complementary Output
States
|ΔVOC|
R = 27Ω or 50Ω, Figure 1
0.2
V
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Maxim Integrated | 3
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
Electrical Characteristics (continued)
(VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;
TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2)
PARAMETER
Output Short-Circuit Current
Output Leakage Current
SYMBOL
ISC
IO
CONDITIONS
VY or VZ = -7V to +12V
VY or VZ = -7V or +12V,
DE485 = GND or SHDN =
GND
MIN
TYP
MAX
±250
MAX3160E
±125
MAX3161E
±25
MAX3162E
±25
UNITS
mA
µA
RS-232 TRANSMITTER TIMING CHARACTERISTICS (SLOW MODE, FAST = GND, 250kbps, one transmitter switching)
Maximum Data Rate
Transmitter Skew
RL = 3kΩ, CL = 1000pF
tTSKEW
VCC = +3.3V, TA = +25°C,
RL = 3kΩ to 7kΩ,
measured from +3.0V to
-3.0V or -3.0V to +3.0V
Transition-Region Slew Rate
250
RL = 3kΩ, CL = 150pF, Figure 6
kbps
25
ns
CL = 150pF
to 1000pF
6
30
CL = 150pF
to 2500pF
4
30
V/µs
RS-232 TRANSMITTER TIMING CHARACTERISTICS (FAST MODE, FAST = VCC, 1Mbps, one transmitter switching)
Maximum Data Rate
Transmitter Skew
tTSKEW
VCC = +3V to +4.5V, RL = 3kΩ, CL = 250pF
1
VCC = +4.5V to +5.5V, RL = 3kΩ,
CL = 1000pF
1
RL = 3kΩ, CL = 150pF, Figure 6
VCC = +3.3V, TA = +25°C, RL
= 3kΩ to 7kΩ, CL = 150pF to
1000pF, measured from +3.0V
to -3.0V or -3.0V to +3.0V
Transition-Region Slew Rate
Mbps
10
ns
MAX3160E
13
150
MAX3161E
MAX3162E
24
150
V/µs
RS-232 RECEIVER TIMING CHARACTERISTICS
Receiver Propagation Delay
tPHL,tPLH
R_IN to R_OUT, CL = 15pF, Figure 5
0.15
µs
Receiver Output Enable Time
tRZL,tRZH
CL = 50pF, Figures 2, 10, MAX3162E
200
ns
Receiver Output Disable Time
tRLZ,tRHZ
CL = 15pF, Figures 2, 10, MAX3162E
200
ns
CL = 50pF, Figure 5
100
ns
Receiver Skew
tRSKEW
RS-485/RS-422 DRIVER TIMING CHARACTERISTICS (SLOW MODE, FAST = GND, 250kbps)
Differential Driver Propagation
Delay
tDPHL,
tDPLH
RDIFF = 54Ω, CL = 50pF, Figures 3, 7
200
400
800
ns
Differential Driver Rise and Fall
Time
tDR,
tDF
RDIFF = 54Ω, CL = 50pF, Figures 3, 7
200
400
800
ns
Differential Driver Propagation
Delay Skew
tDSKEW
RDIFF = 54Ω, CL = 50pF, Figures 3, 7
200
ns
Driver Output Enable Time
tDZH, tDZL
CL = 50pF, Figures 4, 8
400
900
ns
Driver Output Disable Time
tDLZ, tDHZ
CL = 50pF, Figures 4, 8
200
400
ns
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Maxim Integrated | 4
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
Electrical Characteristics (continued)
(VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;
TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
RS-485/RS-422 DRIVER TIMING CHARACTERISTICS FAST MODE, FAST = VCC, 10Mbps)
MIN
TYP
MAX
UNITS
Differential Driver Propagation
Delay
tDPHL,
tDPLH
RDIFF = 54Ω, CL = 50pF, Figures 3, 7
60
120
ns
Differential Driver Rise and Fall
Times
tDR, tDF
RDIFF = 54Ω, CL = 50pF, Figures 3, 7
10
25
ns
Differential Driver Propagation
Delay Skew
tDSKEW
RDIFF = 54Ω, CL = 50pF, Figures 3, 7
10
ns
Driver Output Enable Time
tDZH,tDZL
CL = 50pF, Figures 4, 8
400
900
ns
Driver Output Disable Time
tDHZ,tDLZ
CL = 50pF, Figures 4, 8
200
400
ns
RS-485/RS-422 RECEIVER TIMING CHARACTERISTICS
Receiver Propagation Delay
Receiver Propagation Delay
Skew
Receiver Output Enable Time
Receiver Output Disable Time
tRPLH,
tRPHL
CL = 15pF, Figures 9, 11
80
150
ns
tRSKEW
CL = 15pF, Figures 9, 11
1
10
ns
tRZL, tRZH
tRLZ, tRHZ
MAX3162E, CL = 50pF, Figures 2, 10
MAX3162E, CL = 15pF, Figures 2, 10
100
100
ns
ns
ESD PROTECTION
R_IN, T_OUT, A, B, Y, Z
Human Body Model
±15
kV
Note 2: All currents into the device are positive. All currents out of the device are negative.
Note 3: Applies to A, B for MAX3162E and MAX3160E/MAX3161E with HDPLX = GND, or Y, Z for MAX3160E/MAX3161E with
HDPLX = VCC.
Typical Operating Characteristics
(VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to
ground, TA = +25°C, unless otherwise noted.)
2.50
0
-2.50
-5.00
-7.50
7.50
0
-2.50
0
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
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5000
RISING
14
12
FALLING
10
8
6
-5.00
4
-7.50
2
0
-10.00
-10.00
16
5.00
2.50
MAX3160E toc03
DATA RATE = 1Mbps
SLEW RATE (V/μs)
5.00
18
MAX3160E toc02
7.50
10.00
TRANSMITTER OUTPUT VOLTAGE (V)
MAX3160E toc01
TRANSMITTER OUTPUT VOLTAGE (V)
10.00
RS-232 TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE (FAST = GND)
RS-232 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (FAST = VCC)
RS-232 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (FAST = GND)
0
500
1000
1500
2000
LOAD CAPACITANCE (pF)
2500
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
Maxim Integrated | 5
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to
ground, TA = +25°C, unless otherwise noted.)
MAX3160E/MAX3161E
OPERATING SUPPLY CURRENT
RS-232 TRANSMITTER SLEW RATE
NO-LOAD SUPPLY CURRENT
vs. LOAD CAPACITANCE WHEN
vs. LOAD CAPACITANCE (FAST = VCC)
vs. TEMPERATURE
TRANSMITTING DATA (RS-232 MODE)
60
50
FALLING
40
30
40
DATA RATE = 250kbps
30
20
MAX3160E toc06
2.5
SUPPLY CURRENT (mA)
70
DATA RATE =
1Mbps
50
SUPPLY CURRENT (mA)
SLEW RATE (V/μs)
RISING
80
3.0
MAX3160E to05
100
90
60
MAX3160E toc04
110
RS-485 MODE
2.0
1.5
RS-232 MODE
1.0
DATA RATE = 20kbps
20
0.5
10
10
0
400
800
1200
1600
0
2000
1000
2000
3000
4000
-40
5000
-15
10
35
60
85
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
SHUTDOWN CURRENT
vs. TEMPERATURE
RS-485/RS-422 OUTPUT CURRENT
vs. DRIVER-OUTPUT LOW VOLTAGE
RS-485/RS-422 OUTPUT CURRENT
vs. DRIVER-OUTPUT LOW VOLTAGE
150
100
100
80
60
40
MAX3160E toc09
120
OUTPUT CURRENT (mA)
120
OUTPUT CURRENT (mA)
200
140
MAX3160E toc08
140
MAX3160E toc07
250
SHUTDOWN CURRENT (nA)
0
0
0
100
80
60
40
50
20
20
0
-15
10
35
60
85
0
2
4
6
8
10
-7
12
-5
-3
-1
1
3
5
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
RS-485/RS-422 DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
RS-485/RS-422 DRIVER DIFFERENTIAL
OUTPUT vs. TEMPERATURE
RECEIVER OUTPUT CURRENT vs. RECEIVEROUTPUT LOW VOLTAGE
70
60
50
40
30
2.7
2.6
2.5
2.4
2.3
20
2.2
10
2.1
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOW VOLTAGE (V)
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3.5
4.0
25
20
15
10
5
0
2.0
0
30
MAX3160E toc12
2.8
OUTPUT VOLTAGE (V)
80
RDIFF = 100Ω
FIGURE 1
2.9
OUTPUT CURRENT (mA)
90
MAX3160E toc11
3.0
MAX3160E toc10
100
OUTPUT CURRENT (mA)
0
0
-40
-40
-15
10
35
TEMPERATURE (°C)
60
85
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT LOW VOLTAGE (V)
Maxim Integrated | 6
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to
ground, TA = +25°C, unless otherwise noted.)
10
8
6
4
80
FALLING
50
40
30
20
2
RISING
40
FALLING
35
30
25
10
20
0
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-40
-15
10
35
60
-40
85
-15
10
35
60
85
OUTPUT-HIGH VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
RS-485/RS-422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (FAST = GND)
RS-485/RS-422 DRIVER PROPAGATION
(FAST = VCC, 10Mbps)
RS-485/RS-422 DRIVER PROPAGATION
(FAST = GND, 250kbps)
350
MAX3160E toc16
400
PROPAGATION DELAY (ns)
CL = 50pF
RDIFF = 54Ω
DATA RATE = 10Mbps
45
60
MAX3160E toc15
RISING
70
50
MAX3160E toc14
90
PROPAGATION DELAY (ns)
OUTPUT CURRENT (mA)
12
100
PROPAGATION DELAY (ns)
MAX3160E toc13
14
RS-485/RS-422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (FAST = VCC)
RS-485/RS-422 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
RECEIVER OUTPUT CURRENT
vs. RECEIVER-OUTPUT HIGH VOLTAGE
RISING
MAX3160E toc18
MAX3160E toc17
CL = 50pF
RDIFF = 54Ω
DI
2V/div
CL = 50pF
RDIFF = 54Ω
DI
2V/div
300
FALLING
VY - V Z
2V/div
VY - V Z
2V/div
250
200
CL = 50pF
RDIFF = 54Ω
DATA RATE = 250kbps
150
100
-40
-15
10
35
60
1.0μs/div
20ns/div
85
TEMPERATURE (°C)
RS-485/RS-422 RECEIVER PROPAGATION
(FAST = VCC, 5Mbps)
I-V OUTPUT IMPEDANCE CURVE
IN RS-232 SHUTDOWN MODE
200
OUTPUT CURRENT (μA)
MAX3160E toc20
MAX3160E toc19
400
RS-485/RS-422 RECEIVER PROPAGATION
(FAST = VCC, 5Mbps)
MAX3160E toc21
CL = 15pF
VY - V Z
2V/div
CL = 50pF
RDIFF = 54Ω
DE485
2V/div
0
-200
-400
VY - V Z
2V/div
RO
2V/div
-600
-800
-1000
-20
-15
-10
-5
0
5
10
15
20
4ns/div
100ns/div
OUTPUT VOLTAGE (V)
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Maxim Integrated | 7
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to
ground, TA = +25°C, unless otherwise noted.)
MAX3160E
RS-232 TRANSMITTER PROPAGATION
(FAST = GND, 250kbps)
MAX3160E
RS-232 TRANSMITTER PROPAGATION
(FAST = VCC, 250kbps)
MAX3160E toc22
MAX3160E toc23
CL = 1000pF
RL = 7kΩ
CL = 150pF
RL = 7kΩ
DI
2V/div
DI
2V/div
T_OUT
5V/div
T_OUT
5V/div
1.0μs/div
1.0μs/div
MAX3161E/MAX3162E
RS-232 TRANSMITTER PROPAGATION
(FAST = GND, 250kbps)
MAX3161E/MAX3162E
RS-232 TRANSMITTER PROPAGATION
(FAST = VCC, 250kbps)
MAX3160E toc25
MAX3160E toc24
CL = 150pF
RL = 7kΩ
CL = 1000pF
RL = 7kΩ
T_OUT
5V/div
T_OUT
5V/div
1.0μs/div
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (FAST = GND)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
WITH RS-232 RUNNING (FAST = GND)
INPUTS AT VCC AND GND
2 TRANSMITTERS LOADED WITH 3kΩ
10
SUPPLY CURRENT (mA)
5.00
2.50
0
-2.50
-5.00
MAX3160E toc27
12
MAX3160E toc26
TRANSMITTER OUTPUT VOLTAGE (V)
DI
2V/div
1.0μs/div
10.00
7.50
DI
2V/div
8
6
4
CL = 50pF
RL = 3kΩ
1 TRANSMITTER AT 250kbps
2
-7.50
0
-10.00
2.0
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
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5.5
6.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE (V)
Maxim Integrated | 8
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
Pin Description
PIN
MAX3160E
NAME
FUNCTION
MAX3161E
MAX3162E
1
1
1
C1+
Positive Terminal of the Positive Flying Capacitor
2
2
2
VCC
Positive Supply Voltage
3
3
3
C1-
Negative Terminal of the Positive Flying Capacitor
4
4
4
GND
—
5
5
T1OUT
Ground
5
—
—
Z(B)/T1OUT
—
—
6
Z
—
6
—
Z(B)
6
—
—
Y(A)/T2OUT
—
—
7
Y
—
7
—
Y(A)
7
9
9
R1OUT
RS-232 Receiver Output
RS-232 Driver Output
RS-232 Driver Output
Inverting RS-485/RS-422 Driver Output in Full-Duplex Mode
(and Inverting RS-485/RS-422 Receiver Input in Half-Duplex
Mode)/RS-232 Driver Output
Inverting RS-485/RS-422 Driver Output
Inverting RS-485/RS-422 Driver Output in Full-Duplex Mode
(and Inverting RS-485/RS-422 Receiver Input in Half-Duplex
Mode)
Noninverting RS-485/RS-422 Driver Output in Full-Duplex
Mode (and Noninverting RS-485/RS-422 Receiver Input in
Half-Duplex Mode)/RS-232 Driver Output
Noninverting RS-485/RS-422 Driver Output
Noninverting RS-485/RS-422 Driver Output in Full-Duplex
Mode (and Noninverting RS-485/RS-422 Receiver Input in
Half-Duplex Mode)
—
8
8
T2OUT
8
10
—
RO/R2OUT
9
11
13
SHDN
Active-Low Shutdown-Control Input. Drive SHDN low to shut
down transmitters and charge pump.
—
—
10
R2OUT
RS-232 Driver Output
10
12
14
FAST
—
—
11
RO
11
13
—
RS-485/RS-232
—
—
12
RE485
RS-485/RS-422 Receiver Enable Input. Logic-level low enables
RS-485/RS-422 receivers.
12
14
—
HDPLX
Pin-Selectable Mode Functionality Input. Operates in fullduplex mode when low; operates in half-duplex mode when
high.
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RS-485/RS-422 Receiver Output/RS-232 Receiver Output
Transmitter Speed-Select Input. Select slew-rate limiting for
RS-232 and RS-485/RS-422. Slew-rate limits with a logic-level
low.
RS-485/RS-422 Receiver Output
Pin-Selectable Mode Functionality Input. Operates as
RS-485/RS-422 with a logic-level high; operates as RS-232
with a logic-level low.
Maxim Integrated | 9
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
Pin Description (continued)
PIN
NAME
FUNCTION
MAX3160E
MAX3161E
MAX3162E
13
—
—
A/R2IN
Noninverting RS-485/RS-422 Receiver Input/RS-232 Receiver
Input
14
—
—
B/R1IN
Inverting RS-485/RS-422 Receiver Input/RS-232 Receiver Input
—
—
15
RE232
RS-232 Receiver Enable. Logic-level low enables
RS-232 receivers.
—
15
17
A
15
19
—
DE485/T2IN
—
—
16
TE232
—
16
18
B
16
20
—
DI/T1IN
—
17
19
R2IN
17
21
25
V-
Noninverting RS-485/RS-422 Receiver Input
RS-485/RS-422 Driver Enable/RS-232 Driver Input
RS-232 Transmitter Output Enable
Inverting RS-485/RS-422 Receiver Input
RS-485/RS-422 Driver Input/RS-232 Driver Input
RS-232 Receiver Input
Negative Charge-Pump Rail
—
18
20
R1IN
RS-232 Receiver Input
18
22
26
C2-
Negative Terminal of the Negative Flying Capacitor
19
23
27
C2+
Positive Terminal of the Negative Flying Capacitor
20
24
28
V+
—
—
21
T2IN
—
—
22
DE485
—
—
23
DI
—
—
24
T1IN
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Positive Charge-Pump Rail
RS-232 Driver Input
RS-485/RS-422 Driver Enable Input
RS-485/RS-422 Driver Input
RS-232 Driver Input
Maxim Integrated | 10
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E Functional Diagram
RS-232 MODE
RS-485 MODE
VCC
C1+
V+
1
20
C3
C1
2
3
VCC
C2+
CHARGE
PUMP
C1-
C1
2
19
C2
C2-
3
18
CBYPASS
CBYPASS
4
GND
V-
4
17
C1+
V+
VCC
C2+
LOGIC
OUTPUTS
7
8
T1
T2
R1
R2
9 SHDN
15
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LOGIC
INPUTS
13
HDPLX 12
RS-485
OUTPUTS
6
VZ
Y
7
14
MAX3160E
10 FAST
5
16
ESD
PROTECTION
6
ESD
PROTECTION
5
RS-232
INPUTS
C2-
GND
C4
RS-232
OUTPUTS
CHARGE
PUMP
C1-
R0
LOGIC
OUTPUT 8
R
20
C3
18
17
C4
16
LOGIC
INPUTS
15
DE485
B
A
9 SHDN
14
RS-485
INPUTS
13
12
HDPLX
RS-485/RS-232 11
C2
19
D
ESD
PROTECTION
1
ESD
PROTECTION
VCC
LOGIC
INPUT
MAX3160E
10 FAST
RS-485/RS-232 11
Maxim Integrated | 11
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3161E Functional Diagram
RS-232 MODE
RS-485 MODE
VCC
VCC
1
C1+
V+
1
24
C3
C1
2
3
VCC
C2+
CHARGE
PUMP
C1-
23
2
3
22
CBYPASS
CBYPASS
4
GND
V-
4
21
V+
VCC
C2+
24
C3
C1
C2
C2-
C1+
CHARGE
PUMP
C1-
C2-
GND
V-
23
C2
22
21
C4
9
LOGIC
OUTPUTS
10
11 SHDN
12 FAST
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T2
R1
16
R2
15
MAX3161E
7
18
17
HDPLX 14
RS-485/RS-232 13
6
RS-485
OUTPUTS
RS-232
INPUTS
20
Z
Y
LOGIC
INPUTS
19
D
18
DE485
8
17
ESD
PROTECTION
8
19
LOGIC
INPUTS
ESD
PROTECTION
7
5
20
ESD
PROTECTION
6
RS-232
OUTPUT
T1
5
ESD
PROTECTION
RS-232
OUTPUT
C4
9
R0
LOGIC
OUTPUT 10
R
11 SHDN
12 FAST
B
A
HDPLX
MAX3161E
16
RS-485
INPUTS
15
14
LOGIC
INPUT
RS-485/RS-232 13
Maxim Integrated | 12
MAX3160E/MAX3161E/MAX3162E
MAX3162E Functional Diagram
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
Test Circuits
Y
R
VCC
1
C1+
V+
VOD
28
C3
C1
2
3
VCC
C2+
CHARGE
PUMP
C1-
C2-
R
27
VOC
C2
Z
26
CBYPASS
4
GND
V-
RS-485
OUTPUTS
7
24
Z
Y
ESD
PROTECTION
6
C4
T1
RS-232
5
OUTPUT
Figure 1. RS-485/RS-422 Driver DC Test Load
25
23
D
LOGIC
INPUTS
DE485
S2
211
R1
20
RS-232
INPUTS
R2
11
RO
LOGIC
INPUT 12
R
ESD
PROTECTION
10
1k
22
9
13 SHDN
14 FAST
MAX3162E
Figure 2. RS-485/RS-422 and RS-232 Receiver Enable/Disable
Timing Test Load
19
B
A
RE485
VCC
S1
CL
T2
RS-232
8
OUTPUT
LOGIC
OUTPUTS
1kΩ
TEST POINT
RECEIVER
OUTPUT
TE232
RE-232
18
RS-485
INPUTS
3V
DE485
17
16
15
Y
DI
VOD RDIFF
LOGIC
INPUTS
CL
Z
Figure 3. RS-485/RS-422 Driver Timing Test Circuit
OUTPUT
UNDER TEST
500Ω
S1
VCC
CL
S2
Figure 4. RS-485/RS-422 Driver Enable/Disable Timing Test Load
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Maxim Integrated | 13
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
+3V
+3V
0V
1.5V
1.5V
INPUT
INPUT
1.5V
0V
VCC
OUTPUT
V+
50%
50%
tPHL
0V
V-
OUTPUT
GND
tPLH
tPLH
tPHL
tSKEW = | tPLH - tPHL |
tRSKEW = | tPLH - tPHL |
Figure 6. RS-232 Transmitter Propagation-delay Timing
Figure 5. RS-232 Receiver Propagation-Delay Timing
3V
DE485
0
3V
DI
1.5V
0
1.5V
tDPHL
tDPLH
1/2 VO
10%
VDIFF = Vy - Vz
10%
0
tDF
tDSKEW = | tDPLH - tDPHL |
tDZH
A
B
VCC/2
OUTPUT
tRPHL
tDHZ
Figure 8. RS-485/RS-422 Driver Enable and Disable Times
3V
RE232 OR RE485
0
VCC/2
VOH - 0.5V
2.3V
VOH
VOL
VOL + 0.5V
OUTPUT NORMALLY HIGH
Y, Z
90%
90%
Figure 7. RS-485/RS-422 Driver Propagation Delays
1V
2.3V OUTPUT NORMALLY LOW
VOL
tDR
-1V
tDLZ
tDZL
VO
RO
1.5V
Y, Z
Y
VO
0
-VO
1.5V
1/2 VO
Z
VDIFF
1.5V
1.5V
1.5V
tRZL
tRPLH
tRLZ
VCC
RO
1.5V OUTPUT NORMALLY LOW
RO
1.5V
INPUT
VOL + 0.5V
OUTPUT NORMALLY HIGH
tRSKEW = | tRPLH - tRPHL |
VOH - 0.5V
0
tRZH
Figure 9. RS-485/RS-422 Receiver Propagation Delays
tRHZ
Figure 10. MAX3162 RS-485/RS-422 and RS-232 Receiver
Enable and Disable Times
B
VID
R
A
RO
CL
Figure 11. RS-485/RS-422 Receiver Propagation Delays Test
Circuit
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Maxim Integrated | 14
MAX3160E/MAX3161E/MAX3162E
Detailed Description
The MAX3160E/MAX3161E/MAX3162E +3V to +5.5V,
multiprotocol transceivers can be pin-configured in a
number of RS-232 and RS-485/RE-422 interface combinations. These circuit configurations are ideal for the
design of RS-232 to RS-485 converters, multiprotocol
buses, or any application that requires both RS-232 and
RS-485 transceivers. The slew rate of these devices is
on-the-fly pin selectable, allowing reduced EMI data
rates, or up to 10Mbps RS-485 communications. Power
consumption can be reduced to 10nA by using the
shutdown function, but the RS-232 receivers remain
active allowing other devices to query the interface controller. A flow-through pinout and the space-saving
SSOP packages (available in commercial and extended
temperature ranges) facilitate board layout.
Device Selection
The MAX3160E/MAX3161E/MAX3162E contain RS-232
transceivers and an RS-485/RS-422 transceiver. The
primary difference between the devices is the multiplexing of the I/O ports.
The MAX3160E has common transmitter outputs and
receiver inputs for its RS-232 and RS-485/RS-422 transceivers, and common digital I/O ports. The MAX3160E
is optimized for multiprotocol operation on a single
interface bus and comes in a 20-pin SSOP package.
The MAX3161E has separate transmitter outputs and
receiver inputs for its RS-232 and RS-485/RS-422 transceivers, and common digital I/O ports. The MAX3161E is
optimized for multiplexing a single UART across two interface buses and is available in a 24-pin SSOP package.
The MAX3162E has separate transmitter outputs and
receiver inputs for its RS-232 and RS-485/RS-422 transceivers, and separate digital I/O ports. The MAX3162E
is optimized for protocol translation between two interface buses and comes in a 28-pin SSOP package.
See Tables 1–12, the Functional Diagrams, and the following descriptions for details on each device.
MAX3160E
The MAX3160E is a 2T X /2R X RS-232 transceiver in
RS-232 mode, capable of RS-232-compliant communication. Assertion of RS-485/RS-232 converts the device
to a single RS-485 transceiver by multiplexing the RS232 I/O ports to an RS-485 driver and receiver pair. The
logic inputs now control the driver input and the driver
enable. One logic output carries the RS-485 receiver output, and the other is tri-stated. The receiver input impedance is dependent on the device mode and is 1/4-unit
load for RS-485 operation and 5kΩ for RS-232 operation.
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±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3161E
The MAX3161E is a 2T X /2R X RS-232 transceiver in
RS-232 mode or a single RS-485/RS-422 transceiver in
RS-485 mode. When in RS-485 mode, the unused RS232 transmitter and receiver outputs are disabled. When
in RS-232 mode, the RS-485 transmitter outputs are disabled and the RS-232 receiver inputs are 5kΩ to GND.
The RS-485 receiver inputs are always 1/8-unit load.
Logic lines are shared between the two protocols and are
used for signal inputs and as an RS-485 driver enable.
MAX3162E
The MAX3162E is a 2Tx/2Rx RS-232 transceiver and a
single RS-485/RS-422 transceiver simultaneously. All
drivers, receivers, and transmitters can be enabled or
disabled by pin selection. All outputs are high-impedance when not activated. RS-232 receiver inputs are
5kΩ when enabled, and RS-485 receiver inputs are
1/8-unit load.
Fast-Mode Operation
The FAST control input is used to select the slew-rate
limiting of the RS-232 transmitters and the RS-485/
RS-422 drivers. With FAST unasserted, the RS-232
transmitters and the RS-485/RS-422 driver are slew-rate
limited to reduce EMI. RS-232 data rates up to 1Mbps
and RS-485/RS-422 data rates up to 10Mbps are possible when FAST is asserted. FAST can be changed during operation without interrupting data communications.
Half-Duplex RS-485/RS-422 Operation
Asserting HDPLX places the MAX3160E/MAX3161E in
half-duplex mode. The RS-485 receiver inputs are internally connected to the driver outputs. To receive
RS-485 data, disable the RS-485 outputs by driving
DE485 low. HDPLX has no affect on RS-232 operation.
Low-Power Shutdown
The MAX3160E/MAX3161E/MAX3162E have an activelow shutdown control input, SHDN. When SHDN is driven low, the charge pump and transmitters are shut
down and supply current is reduced to 10nA. The
RS-232 receiver outputs remain active if in RS-232
mode. The charge-pump capacitors must be
recharged when coming out of shutdown before resuming operation in either RS-232 or RS-485/RS-422 mode
(Figure 12).
Dual Charge-Pump Voltage Converter
The MAX3160E/MAX3161E/MAX3162E’s internal power
supply consists of a regulated dual charge pump that
provides output voltages of +5.5V (doubling charge
pump), and -5.5V (inverting charge pump), for input
voltages (V CC) over the +3.0V to +5.5V range. The
charge pumps operate in a discontinuous mode. If the
Maxim Integrated | 15
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
magnitude of either output voltage is less than +5.5V,
the charge pumps are enabled. If the magnitude of
both output voltages exceeds +5.5V, the charge
pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3,
C4) to generate the V+ and V- supplies (see the
Functional Diagrams).
The receivers convert RS-232 signals to CMOS-logic output levels. All receivers have inverting outputs that
remain active in shutdown. The MAX3160E/MAX3161E/
MAX3162E permit their receiver inputs to be driven to
±25V. Floating receiver input signals are pulled to
ground through internal 5kΩ resistors, forcing the outputs to a logic-high. The MAX3162E has transmitter and
receiver enable pins that allow its outputs to be tri-stated.
RS-485/RS-422 Transceivers
The MAX3160E/MAX3161E/MAX3162E RS-485/RS-422
transceivers feature fail-safe circuitry that guarantees a
logic-high receiver output when the receiver inputs are
open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see
the Fail-Safe Section). The MAX3160E/MAX3161E/
MAX3162E also feature pin-selectable reduced slewrate drivers that minimize EMI and reduce reflections
caused by improperly terminated cables, allowing
error-free data transmission up to 250kbps The transmitters can operate at speeds up to 10Mbps with the
slew-rate limiting disabled. Drivers are short-circuit current limited and thermally limited to protect them
against excessive power dissipation. Half-duplex communication is enabled by driving HDPLX high
(MAX3160E/MAX3161E.)
Fail-Safe
The MAX3160E/MAX3161E/MAX3162E guarantee a
logic-high RS-485 receiver output when the receiver
inputs are shorted or open, or when they are connected
to a terminated transmission line with all drivers disabled. This is done by having the receiver threshold
between -50mV and -200mV. If the differential receiver
input voltage (A-B) is greater than or equal to -50mV,
RO is logic-high. If A-B is less than or equal to -200mV,
RO is logic-low. In the case of a terminated bus with all
transmitters disabled, the receiver’s differential input
voltage is pulled to 0 by the termination. This results in
a logic-high with a 50mV minimum noise margin.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against ESD encountered during handling and assembly. The MAX3160E
/MAX3161E/MAX3162E receiver inputs and transmitter
outputs have extra protection against static electricity
found in normal operation. Maxim’s engineers developed
state-of-the-art structures to protect these pins against
±15kV ESD, without damage. After an ESD event, the
MAX3160E/MAX3161E/MAX3162E continue working
without latchup.
The receiver inputs and transmitter outputs are characterized for ±15kV ESD protection using the Human
Body Model
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 13a shows the Human Body Model, and Figure
13b shows the current waveform it generates when discharged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a
1.5kΩ resistor.
RS-232 Transceivers
The MAX3160E/MAX3161E/MAX3162E RS-232 transmitters are inverting-level translators that convert
CMOS-logic levels to ±5V EIA/TIA-232-compliant levels. The transmitters are guaranteed at a 250kbps data
rate in slew-rate limited mode (FAST = GND) with
worst-case loads of 3kΩ in parallel with 1000pF. Data
rates up to 1Mbps can be achieved by asserting FAST.
When powered down or in shutdown, the MAX3160E/
MAX3161E/MAX3162E outputs are high impedance
and can be driven to ±13.2V. The transmitter inputs do
not have pullup resistors. Connect unused inputs to
ground or VCC.
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Maxim Integrated | 16
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
RC
1MΩ
SHDN
5V/div
T1OUT
2V/div
GND
T2OUT
2V/div
CHARGE-CURRENT
LIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
RD
1.5kΩ
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
40μs/div
Figure 12. RS-232 Transmitter Outputs when Exiting Shutdown
Figure 13a. Human Body ESD Test Model
Machine Model
The Machine Model for ESD testing uses a 200pF storage capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing and
assembly. Of course, all pins (not just RS-485 inputs)
require this protection during manufacturing. Therefore,
the Machine Model is less relevant to the I/O ports than
are the Human Body Model and IEC 1000-4-2.
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
can be used. Ceramic chip capacitors with an X7R
dielectric provide the best combination of performance,
cost, and size. The charge pump requires 0.1µF
capacitors for 3.3V operation. For other supply voltages, see Table 13 for required capacitor values. Do
not use values smaller than those listed in Table 13.
Increasing the capacitor values reduces ripple on the
transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be changed without
changing C1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4,
and CBYPASS to maintain the proper ratios to the
other capacitors.
When using the minimum required capacitor values,
make sure the capacitance value does not degrade
excessively with temperature or voltage. This is typical
of Y5V and Z5U dielectric ceramic capacitors. If in
doubt, use capacitors with a larger nominal value. The
capacitor’s equivalent series resistance (ESR), which
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IP 100%
90%
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPERES
36.8%
10%
0
0
tRL
TIME
tDL
CURRENT WAVEFORM
Figure 13b. Human Body Model Current Waveform
usually rises at low temperatures, influences the
amount of ripple on V+ and V-.
Power-Supply Decoupling
In applications that are sensitive to power-supply noise,
decouple VCC to ground with a capacitor of the same
value as reservoir capacitors C2, C3, and C4. Connect
the bypass capacitor as close to the IC as possible.
Maxim Integrated | 17
MAX3160E/MAX3161E/MAX3162E
RS-232 Transmitter Outputs
when Exiting Shutdown
Figure 12 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). Each
transmitter is loaded with 3kΩ in parallel with 1000pF.
The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that
the transmitters are enabled only when V- exceeds
approximately -3V.
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
VCC
CBYPASS
C1+
VCC
V+
C1
C3
C1C2+
C2
C2-
MAX3160E
MAX3161E
MAX3162E
VC4
T_ OUT
T_ IN
High Data Rates
The MAX3160E/MAX3161E/MAX3162E maintain the
RS-232 ±5V required minimum transmitter output voltage
even at high data rates. Figure 14 shows a transmitter
loopback test circuit. Figure 15 shows a loopback test
result at 250kbps, and Figure 16 shows the same test at
1Mbps. Figure 15 demonstrates a single slew-rate limited transmitter driven at 250kbps (FAST = GND) into an
RS-232 load in parallel with 1000pF. Figure 17 shows a
single transmitter driven at 1Mbps (FAST asserted),
loaded with an RS-232 receiver in parallel with 1000pF.
These transceivers maintain the RS-232 ±5V minimum
transmitter output voltage at data rates up to 1Mbps.
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ
(one-unit load), and the standard driver can drive up to
32-unit loads. The MAX3160E has a 1/4-unit load
receiver input impedance (48kΩ), allowing up to 128
transceivers to be connected in parallel on one communication line. The MAX3161E/MAX3162E have a 1/8unit load receiver input impedance (96kΩ), allowing up
to 256 transceivers to be connected in parallel on one
communication line. Any combination of these devices
and/or other RS-485 transceivers with a total of 32-unit
loads or fewer can be connected to the line.
RS-485/RS-422
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output
stage, provides immediate protection against short circuits over the whole common-mode voltage range (see
the Typical Operating Characteristics). The second, a
thermal shutdown circuit, forces the driver outputs into
a high-impedance state if the die temperature becomes
excessive, typically over +150°C.
Protection Against Wiring Faults
EIA/TIA-485 standards require a common input voltage
range of -7V to +12V to prevent damage to the device.
www.maximintegrated.com
R_ IN
R_ OUT
1000pF
5k
VCC
SHDN
GND
Figure 14. Loopback Test Circuit
The MAX3160E/MAX3161E/MAX3162E inputs are protected to RS-232 levels of ±25V for the receiver inputs
and ±13V for the transmitter/driver outputs. This provides additional protection for the RS-485 transceivers
against ground differential or faults due to miswiring.
RS-485/RS-422 Reduced
EMI and Reflections
The MAX3160E/MAX3161E/MAX3162E can be configured for slew-rate limiting by pulling FAST low. This minimizes EMI and reduces reflections caused by improperly
terminated cables. Operation in slew-rate limited mode
reduces the amplitudes of high-frequency harmonics.
RS-485/RS-422 Line Length vs. Data Length
The RS-485/RS-422 standard covers line lengths up to
4000ft. For line lengths greater than 4000ft, use the
repeater application shown in Figure 17.
RS-232/RS-485 Protocol Translator
Figure 18 shows the MAX3162E configured as an
RS-232/RS-485 protocol translator. The direction of
translation is controlled through the RTS signal (R1IN).
The single-ended RS-232 receiver input signal is translated to a differential RS-485 transmitter output.
Similarly, a differential RS-485 receiver input signal is
translated to a single-ended RS-232 transmitter output.
RS-232 data received on R2IN is transmitted as an RS485 signal on Z and Y. RS-485 signals received on A
and B are transmitted as an RS-232 signal on T1OUT.
Maxim Integrated | 18
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
TIN
TIN
TOUT
5V/div
TOUT
5V/div
ROUT
ROUT
1μs/div
200ns/div
Figure 15. MAX3161E/MAX3162E RS-232 Loopback Test Result
at 250kbps, FAST = Low
Figure 16. MAX3161E/MAX3162E RS-232 Loopback Test Result
at 1Mbps, FAST = High
Multiprotocol Bus
Multiprotocol Bus Multiplexer
The Typical Operating Circuit shows a standard application for the MAX3160E. The MAX3160E’s outputs are
multiplexed between RS-232 and RS-485 protocols by
a microprocessor (µP). The µP also directs the shutdown functions, enable lines, and the duplex of the
MAX3160E. Data is transmitted to the MAX3100 UART
through an SPI™ port. The UART asynchronously
transfers data through the MAX3160E to the pin-selected RS-232 or RS-485 protocal. See Table 14 for commonly used cable connections.
The Typical Application Circuit shows the MAX3161E
configured as a multiprotocol bus multiplexer. The
MAX3161E separates the RS-232 and RS-485 lines, but
shares the logic pins between modes. This application
allows the µP to monitor a point-to-point RS-232 bus, and
a multidrop RS-485 interface. The MAX3100 UART asynchronously transfers data through the MAX3161E to the
pin-selected RS-232 or RS-485 protocol.
SPI is a registered trademark of Motorola, Inc.
www.maximintegrated.com
Maxim Integrated | 19
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
3.3V
MAX3160E
MAX3161E
MAX3162E
A
CBYPASS
100nF
120Ω
RO
R
RE485
DATA IN
B
2
27
C2
100nF
DE485
Z
DI
D
Y
26
120Ω
13
DATA OUT
5
RCV
10
23
NOTE: RE485 ON MAX3162E ONLY
19
TX
20
RTS
Figure 17. RS-485 Line Repeater
15
16
14
28
C2+
VCC
C1+
1
MAX3162E C1- 3
C2-
C1
100nF
SHDN
T1OUT
T1IN
24
R2IN
11
RO
9
R1OUT
12
RE485
22
DE485
R1IN
A
RE232
B
TE232
Z
FAST
Y
R2OUT
DI
V+
C3
100nF
GND
V-
17
18
6
7
25
C4
100nF
Figure 18. Protocol Translator
www.maximintegrated.com
Maxim Integrated | 20
MAX3160E/MAX3161E/MAX3162E
RS-232 Transmitters Truth Tables
Table 1. MAX3160E
INPUTS
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
RS-232 Receivers Truth Tables
Table 4. MAX3160E
OUTPUTS
INPUTS
SHDN
RS-485/
RS-232
DI/T1IN,
DE485/T2IN
Z(B)/T1OUT,
Y(A)/T2OUT
SHDN
0
X
X
1/8-unit load
1
0
0
1
1
0
1
0
1
1
X
RS-485 mode
OUTPUTS
RS-485/
RS-232
B/R1IN,
A/R2IN
R1OUT,
RO/R2OUT
X
0
0
1
X
0
1
0
X
0
Inputs open
1
R1OUT
X
1
X
RO/R2OUT in
RS-485 mode
Table 2. MAX3161E
INPUTS
OUTPUTS
SHDN
RS-485/
RS-232
DI/T1IN,
DE485/T2IN
0
X
X
High-impedance
1
0
0
1
1
0
1
0
1
1
X
High-impedance
T1OUT, T2OUT
Table 5. MAX3161E
INPUTS
OUTPUTS
SHDN
RS-485/
RS-232
R1IN, R2IN
R1OUT,
RO/R2OUT
X
0
0
1
X
0
1
0
X
0
Inputs open
Table 3. MAX3162E
SHDN
0
X
1
1
INPUTS
TE232
X
0
1
1
T1IN,T2IN
X
X
0
OUTPUTS
T1OUT, T2OUT
High-impedance
High-impedance
1
1
0
X
1
X
1
R1OUT
High-impedance,
RO/R2OUT in
RS-485 mode
Table 6. MAX3162E
INPUTS
SHDN
www.maximintegrated.com
High-impedance,
OUTPUTS
RE232
R1IN, R2IN
R1OUT, R2OUT
X
1
X
High-impedance
X
0
0
1
X
0
1
0
X
0
Inputs open
1
Maxim Integrated | 21
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
RS-485/RS-422 Drivers Truth Tables
Table 7. MAX3160E
INPUTS
OUTPUTS
SHDN
RS-232
RS-485/R
DE485/T2IN
DI/T1IN
Z(B)/T1OUT
Y(A)/T2OUT
0
X
X
X
1/8-unit load
1/8-unit load
1
1
0
X
1/8-unit load
1/8-unit load
1
1
1
0
1
0
0
1
1
1
1
X
0
X
X
1
RS-232 mode
Table 8. MAX3161E
INPUTS
OUTPUTS
SHDN
RS-232
RS-485/R
DE485/T2IN
DI/T1IN
Z(B)
Y(A)
0
X
X
X
1/8-unit load
1/8-unit load
X
0
X
X
1/8-unit load
1/8-unit load
X
X
0
X
1/8-unit load
1/8-unit load
1
1
1
0
1
0
1
1
1
1
0
1
Table 9. MAX3162E
INPUTS
OUTPUTS
SHDN
DE485
DI
Z
Y
0
X
X
High-impedance
High-impedance
X
0
X
High-impedance
High-impedance
1
1
0
1
0
1
1
1
0
1
RS-485/RS-422 Receivers Truth Tables
Table 10. MAX3160E
INPUTS
OUTPUT
RS-232
RS-485/R
SHDN
HDPLX
(A - B)*
(Y - Z)*
RO/R2OUT
1
0
X
X
X
High-impedance up to VCC
1
1
0
≥-50mV
X
1
1
1
0
≤-200mV
X
0
1
1
0
Floating
X
1
1
1
1
X
≥-50mV
1
1
1
1
X
≤-200mV
0
1
1
1
X
Floating
1
0
X
X
X
X
*Y and Z correspond to pins Y(A)/T2OUT and Z(B)/T1OUT. A and B correspond to pins A/R2IN and B/R1IN.
www.maximintegrated.com
RS-232 mode
Maxim Integrated | 22
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
RS-485/RS-422 Receivers Truth Tables (continued)
Table 11. MAX3161E
INPUTS
OUTPUT
RS-485/RS-232
SHDN
HDPLX
A-B
Y(A) - Z(B)
RO/R2OUT
1
0
X
X
X
High-impedance up to VCC
1
1
0
≥-50mV
X
1
1
1
0
≤-200mV
X
0
1
1
0
Floating
X
1
1
1
1
X
≥-50mV
1
1
1
1
X
≤-200mV
0
1
1
1
X
Floating
1
0
X
X
X
X
RS-232 mode
Table 12. MAX3162E
INPUTS
OUTPUT
Table 13. Required Minimum
Capacitance Values
SHDN
RE485
A-B
RO
0
X
X
High-impedance
SUPPLY
VOLTAGE (V)
C1 (µF)
C2, C3, C4,
CBYPASS (µF)
X
1
X
High-impedance
+3.0 to +3.6
0.1
0.1
1
0
≥-50mV
1
+4.5 to +5.5
0.047
0.33
1
0
≤-200mV
0
+3.0 to +5.5
0.1
0.47
1
0
Inputs
1
www.maximintegrated.com
Maxim Integrated | 23
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
MAX3160E/MAX3161E/MAX3162E
Table 14. Cable Connections Commonly Used for EIA/TIA-232 and V.24
Asynchronous Interfaces
EIA/TIA-232
STANDARD
CONNECTOR
PIN
MAX3160E
MAX3161E
MAX3162E
EQUIVALENT
MAX3160E
MAX3161E
MAX3162E
DCD
1
—
—
—
—
Data carrier detect
PIN NUMBER
FUNCTION
(AS SEEN BY DTE)
RD
2
R2IN
13
17
19
Received data
TD
3
T1OUT
5
5
5
Transmitted data
DTR
4
—
—
—
—
Data terminal ready
SG
5
GND
4
4
4
Signal ground
DSR
6
—
—
—
—
Data set ready
RTS
7
T2OUT
6
8
8
Request to send (= DTE ready)
CTS
8
R1IN
14
18
20
Clear to send (= DCE ready)
RI
9
—
—
—
—
Ring indicator
Typical Application Circuit
+3.3V
2
VCC
TX
MAX3100
UART
20
12
10
RTS
19
10
9
CTS
RO/R2OUT
DE485/T2IN
11
DB9
T1OUT
DI/T1IN
13
RX
14
HDPLX
R2IN
MAX3161E
T2OUT
R1OUT
R1IN
RS-232
5
17
8
18
1
RS-485
Y(A)
SPI
GND
4
µP
FAST
12
RS-485/
RS-232 SHDN
13
11
Z(B)
RJ45
7
6
RS-485/RS-232
SHDN
MULTIPROTOCOL BUS MULTIPLEXER
www.maximintegrated.com
Maxim Integrated | 24
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
Pin Configurations
TOP VIEW
C1+ 1
20 V+
C1+ 1
24 V+
C1+ 1
28 V+
VCC 2
19 C2+
VCC 2
23 C2+
VCC 2
27 C2+
C1- 3
18 C2-
C1- 3
22 C2-
C1- 3
26 C2-
GND 4
17 V-
GND 4
21 V-
GND 4
25 V-
Z(B)/T1OUT 5
MAX3160E
Y(A)/T2OUT 6
16 DI/T1IN
T1OUT 5
MAX3161E
20 DI/T1IN
T1OUT 5
15 DE485/T2IN
Z(B) 6
19 DE485/T2IN
R1OUT 7
14 B/R1IN
Y(A) 7
RO/R2OUT 8
13 A/R2IN
SHDN 9
12 HDPLX
FAST 10
11 RS-485/RS-232
SSOP
MAX3162E
24 T1IN
Z 6
23 DI
18 R1IN
Y 7
22 DE485
T2OUT 8
17 R2IN
T2OUT 8
21 T2IN
R1OUT 9
16 B
R1OUT 9
20 R1IN
RO/R2OUT 10
15 A
R2OUT 10
19 R2IN
SHDN 11
14 HDPLX
FAST 12
13 RS-485/RS-232
SSOP
RO 11
18 B
RE485 12
17 A
SHDN 13
16 TE232
FAST 14
15 RE232
SSOP
Ordering Information
Chip Information
PART
MAX3160ECAP
TEMP RANGE
0°C to +70°C
PINPACKAGE
20 SSOP
MAX3160EEAP
PACKAGE
CODE
A20-2
TRANSISTOR COUNT: 1805
PROCESS: CMOS
-40°C to +85°C
20 SSOP
A20-2
MAX3161ECAG
0°C to +70°C
24 SSOP
A24-3
MAX3161EEAG
-40°C to +85°C
24 SSOP
A24-3
MAX3162ECAI
0°C to +70°C
28 SSOP
A28-1
MAX3162EEAI
-40°C to +85°C
28 SSOP
A28-1
PART
DUAL
MODE
FLOWTHROUGH
PINOUT
RS-485
INPUT
UNIT
LOADS
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
20 SSOP
A20-2
21-0056
90-0094
MAX3160E
No
Yes
1/4
24 SSOP
A24-3
21-0056
90-0010
MAX3161E
No
No
1/8
28 SSOP
A28-1
21-0056
90-0095
MAX3162E
Yes
Yes
1/8
Selector Guide
www.maximintegrated.com
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.
Maxim Integrated | 25
MAX3160E/MAX3161E/MAX3162E
±15kV ESD-Protected, +3.0V to
+5.5V, 10nA, RS-232/RS-485/
RS-422 Multiprotocol Transceivers
Revision History
PAGES
CHANGED
REVISION
NUMBER
REVISION
DATE
0
2/05
Initial release
—
1
5/15
Updated Benefits and Features section
1
DESCRIPTION
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. | 26
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