MAX3160_V01 [MAXIM]
3.0V to5.5V, 1μA, RS-232/ RS-485/422 Multiprotocol Transceivers;
| 型号： | MAX3160_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 3.0V to5.5V, 1μA, RS-232/ RS-485/422 Multiprotocol Transceivers |
| 文件： | 总23页 (文件大小：356K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
General Description
RS-485/422 Multiprotocol Transceivers
Benefits and Features
The MAX3160/MAX3161/MAX3162 are programmable
+3V to +5.5V RS-232/RS-485/422 multiprotocol trans-
ceivers. The MAX3160/MAX3161 are pin programmable
as a 2TX/2RX RS-232 interface or a single RS-485/422
transceiver. The MAX3162 is configured as a 2TX/2RX
RS-232 interface and a single RS-485/422 transceiver
simultaneously.
• Flexible Options for RS-232 and RS-422/485
Operation in One Package
• Simultaneous 2TX/2RX RS-232 and Half-Duplex
RS-485 Transceiver Operation (MAX3162)
• Pin-Programmable as Either 2TX/2RX RS-232 or
Half/Full RS-485 Transceiver (MAX3160,
MAX3161)
All devices incorporate a proprietary low-dropout trans-
mitter output stage and an on-board dual charge pump
to allow RS-232 and RS-485/422 compliant perfor-
mance from a +3V to +5.5V supply. These devices also
feature pin-selectable transmitter slew rates for both
RS-232 and RS-485/422 modes. Slew-rate limiting mini-
mizes EMI and reduces reflections caused by improp-
erly 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-485/422 mode and up to 1Mbps in RS-
232 mode.
• Integrated Protection Increases Robustness
• 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 Common-
Mode Voltage Range
• Thermal Protection from Excessive Power
Dissipation
• Slew Rate Limiting Minimizes EM and Reduces
Cable Reflections
The MAX3160/MAX3162 offer a flow-through pinout that
facilitates board layout. The MAX3160/MAX3161/
MAX3162 are available in tiny SSOP packages and
operate from -40°C to +85°C.
• Integrated Charge-Pump Circuitry Saves Board
Space
• Eliminates the Need for a Bipolar 12V Supply
Applications
• Enables Single-Supply Operation From +3V to
Point-of-Sales Equipment
Industrial Controls
Peripherals
Networking
+5.5V Voltage Supply
• 1µA Shutdown Supply Current Saves Power
• Allows Up to 256 Transceivers on the Bus
RS-232 to RS-485
Interface Converters
Typical Operating Circuit
Ordering Information
+3V TO +5.5V
PART
TEMP RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
PIN-PACKAGE
1
MAX3160CAP+
MAX3160EAP+
MAX3161CAG+
MAX3161EAG+
MAX3162CAI+
20 SSOP
20 SSOP
24 SSOP
24 SSOP
28 SSOP
DB9
V
CC
RS485/RS232
11
DI/T1IN
Z(B)/T1OUT
TX
13
5
16
DE/T2IN
MAX3160
Y(A)/T2OUT
RTS
RX
6
MAX3100
11
12
15
A/R2IN
RO/R2OUT
8
MAX3162EAI+
-40°C to +85°C
28 SSOP
13
B/R1IN
CTS
+Denotes a lead(Pb)-free/RoHS-compliant package.
R1OUT
7
14
10
GND FAST HDPLX SHDN
SPI
4
10
9
12
RJ45
SHDN
µP
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
19-1722; Rev 3; 5/15
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
V
CC
to GND..............................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
A
V+ to GND................................................................-0.3V to +7V
V- to GND....................................................................0.3V to -7V
V+ - V- (Note 1)....................................................................+13V
Input Voltages
20-Pin SSOP (derate 11.9W/°C above +70°C) ..........952mW
24-Pin SSOP (derate 14.9W/°C above +70°C) ........1195mW
28-Pin SSOP (derate 15W/°C above +70°C) ...........1201mW
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
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...................................... 13.2V
R2OUT, R1OUT, RO to GND................-0.3V to (V
Output Short-Circuit Duration
+ 0.3V)
CC
T1OUT, T2OUT, Y, Z ............................................Continuous
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
(V
= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V 10ꢀ; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V
CC
10ꢀ; T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
MAX3160/MAX3161, no load,
RS485/RS232 = GND
1.2
2.5
V
Standby Current
I
I
mA
µA
CC
CC
CC
MAX3160/MAX3161, no load,
2.5
3.0
1
5.5
6
RS485/RS232 = V
CC
MAX3162 No Load
SHDN = GND, receiver inputs open or
grounded
V
Shutdown Current
10
CC
RE485
, TE232,
RE232
RS232
, FAST, HDPLX, SHDN, RS485/
TRANSMITTER AND LOGIC INPUTS (DI, T1IN, T2IN, DE485,
)
Logic Input Low
V
0.8
V
IL
V
V
= +3.3V
= +5V
2.0
2.4
CC
CC
Logic Input High
V
V
IH
Logic Input Leakage Current
Transmitter Logic Hysteresis
I
0.01
0.5
1
µA
V
INL
V
HYS
RS-232 AND RS-485/422 RECEIVER OUTPUTS (R1OUT, R2OUT, RO)
Receiver Output Voltage Low
Receiver Output Voltage High
V
I
I
= 2.5mA
= -1.5mA
0.4
V
V
OL
OUT
OUT
V
V
- 0.6
CC
OH
Receiver Output Short Circuit
Current
I
I
0 < V < V
CC
20
60
1
mA
µA
OSR
OZR
O
Receiver Output Leakage
Current
Receivers disabled
0.05
www.maximintegrated.com
Maxim Integrated | 2
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Electrical Characteristics (continued)
(V
= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V 10ꢀ; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RS-232 RECEIVER INPUTS (R1IN, R2IN)
Input Voltage Range
-25
0.6
0.8
25
V
V
V
V
V
V
= +3.3V
= +5V
CC
CC
CC
CC
Input Threshold Low
Input Threshold High
=+3.3V
= +5V
2.0
2.4
V
Input Hysteresis
0.5
5
V
Input Resistance
3
7
kΩ
RS-485/422 RECEIVER INPUTS (NOTE 2)
MAX3160
48
96
Input Resistance
Input Current
R
-7V < V
< +12V
kΩ
IN
CM
MAX3161/
MAX3162
V
V
V
V
= +12V
= -7V
0.25
CM
CM
CM
CM
MAX3160
MAX3161/MAX3162
-0.15
0.125
-0.075
-50
I
mA
IN
= +12V
= -7V
Input Differential Threshold
Input Hysteresis
V
-200
mV
mV
TH
ΔV
30
TH
RS-232 TRANSMITTER OUTPUTS (T1OUT, T2OUT)
Both transmitter outputs loaded with 3kΩ
to GND
Output Voltage Swing
5
5.4
V
Output Resistance
V
= V+ = V- = 0V, V
= V = +2V
T2OUT
300
10M
30
Ω
CC
T1OUT
Output Short-Circuit Current
T_OUT = GND
60
125
25
mA
MAX3160/
MAX3161
V
= 12V
OUT
Output Leakage Current
TE232 = GND or SHDN =
GND
µA
MAX3162
RS-485/422 TRANSMITTER OUTPUTS (Y, Z)
R = 27Ω
(RS-485)
1.5
2
Differential Output Voltage
V
Figure 1
V
OD
R = 50Ω
(RS-422)
Change in Magnitude of
Differential Output Voltage for
Complementary Output States
ΔV
R = 27Ω or 50Ω, Figure 1
R = 27Ω or 50Ω, Figure 1
-0.2
0.2
3
V
V
OD
Common Mode Output Voltage
V
OC
Change in Magnitude of
Common Mode Output Voltage
for Complementary Output
States
Δ V
R = 27Ω or 50Ω, Figure 1
0.2
V
OC
www.maximintegrated.com
Maxim Integrated | 3
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Electrical Characteristics (continued)
(V
= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V 10ꢀ; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V
CC
10ꢀ; T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
V or V = +12V to –7V
MIN
TYP
MAX
UNITS
Output Short-Circuit Current
I
250
mA
SC
Y
Z
MAX3160/
MAX3161
V or V = +12V,
DE485 = GND or SHDN =
GND
Y
Z
125
25
Output Leakage Current
µA
IO
MAX3162
RS-232 TIMING CHARACTERISTICS (FAST = GND, 250kbps, ONE TRANSMITTER SWITCHING)
Maximum Data Rate
R = 3kΩ, C = 1000pF
250
kbps
µs
L
L
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
R_IN to R_OUT, C = 150pF
0.15
200
200
100
50
L
ns
ns
|t
|t
- t
|
|
ns
PHL PLH
Receiver Skew
- t
ns
PLH PHL
C = 150pF
L
to 1000pF
V
= +3.3V, T = +25°C,
A
CC
6
4
30
30
R =3kΩ to 7kΩ, measured
from +3.0V or –3.0V to
+3.0V
L
Transition-Region Slew Rate
V/µs
C = 150pF
L
to 2500pF
RS-232 TIMING CHARACTERISTICS (FAST = V , 1Mbps, ONE TRANSMITTER SWITCHING)
CC
V
= +3V to +4.5V, R = 3kΩ, C = 250pF
1
1
CC
L
L
Maximum Data Rate
Mbps
V
= +4.5V to +5.5V, R = 3kΩ,
CC
L
C = 1000pF
L
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
R_IN to R_OUT, C = 150pF
0.15
200
200
25
µs
ns
ns
ns
ns
L
|t
|t
- t
|
|
PHL PLH
Receiver Skew
- t
50
PLH PHL
V
= +3.3V, T = +25°C, R =3kΩ to 7kΩ,
A L
CC
C = 150pF to 1000pF, measured from
L
Transition-Region Slew Rate
24
150
V/μs
+3.0V or –3.0V to +3.0V
RS-485/422 TIMING CHARACTERISTICS (FAST = GND) 250kbps
t
t
,
DPHL
Driver Propagation Delay
Driver Rise and Fall Time
R
= 54Ω, C = 50pF, Figures 3, 5
200
200
400
400
800
800
ns
ns
DIFF
DIFF
L
DPLH
t
t
,
DPHL
R
= 54Ω, C = 50pF, Figures 3, 5
L
DPLH
Driver Propagation Delay Skew
Driver Output Enable Time
Driver Output Disable Time
t
R
DIFF
R
DIFF
R
DIFF
= 54Ω, C = 50pF, Figure 3, 5
200
800
400
ns
ns
ns
DSKEW
L
t
, t
= 54Ω, C = 50pF, Figures 4, 6
400
200
DZH RZL
L
t
, t
= 54Ω, C = 50pF, Figure 4, 6
L
DLZ DHZ
t
t
RPLH,
Receiver Propagation Delay
C = 15pF, Figures 7, 9
25
80
150
10
ns
ns
L
RPHL
Receiver Propagation Delay
Skew
t
C = 50pF, Figures 7, 9
L
RSKEW
www.maximintegrated.com
Maxim Integrated | 4
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Electrical Characteristics (continued)
(V
= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V 10ꢀ; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V
CC
10ꢀ; T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
C = 50pF, Figures 2, 8
MIN
TYP
MAX
UNITS
Receiver Output Enable Time
t
t
, t
100
ns
RZL RZH
L
Receiver Output Disable Time
, t
C = 50pF, Figures 2, 8
L
100
ns
RLZ RHZ
RS-485/RS-422 TIMING CHARACTERISTICS (FAST = V , 10Mbps)
CC
t
t
DPHL,
Driver Propagation Delay
R
= 54Ω, C = 50pF, Figures 3, 5
60
10
120
ns
DIFF
L
DPLH
Driver Rise And Fall Times
Driver Propagation Delay Skew
Driver Output Enable Time
Driver Output Disable Time
t
, t
R
DIFF
R
DIFF
R
DIFF
R
DIFF
= 54Ω, C = 50pF, Figures 3, 5
25
10
ns
ns
ns
ns
DR DF
L
t
= 54Ω, C = 50pF, Figures 3, 5
L
DSKEW
tDZL
= 54Ω, C = 50pF, Figures 4, 6
400
200
800
400
L
t
, t
= 54Ω, C = 50pF, Figures 4, 6
L
DLZ DHZ
t
t
,
RPLH
Receiver Propagation Delay
C = 15pF, Figures 7, 9
80
150
10
ns
ns
L
RPHL
Receiver Propagation Delay
Skew
t
C = 50pF, Figures 7, 9
L
RSKEW
Receiver Output Enable Time
t
t
, t
C = 50pF, Figures 2, 8
100
100
ns
ns
RZL RZH
L
Receiver Output Disable Time
, t
C = 15pF, Figures 2, 8
L
RLZ RHZ
Note 2: Applies to A, B for MAX3162 and MAX3160/MAX3161 with HDPLX = GND, or Y, Z for MAX3160/MAX3161 with HDPLX = V
CC.
Typical Operating Characteristics
(V
= +3.3V, 250kbps data rate, 0.1µF capacitors, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to ground, T = +25°C,
CC
A
RS-232 TRANSMITTER OUTPUT VOLTAGE vs.
LOAD CAPACITANCE (FAST = GND)
RS-232 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (FAST =
RS-232 TRANSMITTER SLEW RATE vs.
LOAD CAPACITANCE (FAST = GND)
V
)
CC
10.0
18
16
14
12
10
8
10.0
7.5
7.5
5.0
5.0
2.5
2.5
0
0
-2.5
-5.0
-7.5
-10.0
-2.5
-5.0
-7.5
-10.0
6
4
2
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
500
1000
1500
2000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
www.maximintegrated.com
Maxim Integrated | 5
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Typical Operating Characteristics (continued)
(V
= +3.3V, 250kbps data rate, 0.1µF capacitors, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to ground, T = +25°C,
A
CC
unless otherwise noted.)
MAX3160/MAX3161
NO-LOAD SUPPLY CURRENT vs.
TEMPERATURE
OPERATING SUPPLY CURRENT vs.
LOAD CAPACITANCE WHEN
TRANSMITTING DATA (RS-232 MODE)
RS-232 TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE (FAST = V
)
CC
100
90
80
70
60
50
40
30
20
10
0
60
50
40
30
20
10
0
3.0
2.5
2.0
1.5
1.0
0
1Mbps
RS-485 MODE
RS-232 MODE
250kbps
20kbps
0
500
1000
1500
2000
0
1000
2000
3000
4000
5000
-40
-7
0
-15
10
35
60
85
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
RS-485/422 OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
RS-485/422 OUTPUT CURRENT vs.
DRIVER OUTPUT VOLTAGE
SHUTDOWN CURRENT vs. TEMPERATURE
140
120
100
80
160
140
120
100
80
180
160
140
120
100
80
60
60
60
40
40
40
20
20
20
0
0
0
0
2
4
6
8
10
12
-40
-15
10
35
60
85
-5
-3
-1
1
3
5
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE (V)
RS-485/422 DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
RS-485/422 DRIVER DIFFERENTIAL OUTPUT
vs. TEMPERATURE
OUTPUT CURRENT vs. RECEIVER
OUTPUT LOW VOLTAGE
3.5
100
30
25
20
15
10
5
R = 50Ω
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
10
1
0.1
0.01
0.001
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT VOLTAGE (V)
-40
-15
10
35
60
85
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (°C)
www.maximintegrated.com
Maxim Integrated | 6
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Typical Operating Characteristics (continued)
(V
= +3.3V, 250kbps data rate, 0.1µF capacitors, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to ground, T = +25°C,
A
CC
unless otherwise noted.)
RS-485/422 RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
RS-485/422 DRIVER PROPAGATION DELAY
vs.TEMPERATURE (FAST)
OUTPUT CURRENT vs. RECEIVER
OUTPUT HIGH VOLTAGE
120
85
80
75
70
65
60
55
50
14
12
10
8
C = 50pF
L
R = 50Ω
100
80
60
40
20
0
RISING
FALLING
6
4
2
0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
RS-485/422 DRIVER PROPAGATION
(FAST, 10Mbps)
RS-485/422 DRIVER PROPAGATION
(FAST, 10Mbps)
RS-485/422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (SLOW)
MAX3160/2 TOC21
MAX3160/2 TOC20
500
480
460
440
420
400
380
360
340
320
300
R = 50Ω
DI
5V/di
DI
5V/div
V -V
Y
2V/d
V -V
Y
Z
2V/div
1.0μs/div
20ns/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
RS-485/422 RECEIVER PROPAGATION
RS-485/422 DRIVER DISABLE/ENABLE
I-V OUTPUT IMPEDANCE CURVE
IN RS-232 SHUTDOWN MODE
(FAST, 5Mbps)
TO DRIVER OUTPUT
MAX3160/2 TOC24
MAX3160/2 TOC22
400
200
DE48
2V/d
V -V
2V/div
Y
Z
0
R = 50Ω
C = 82pF
L
-200
-400
-600
-800
-1000
C = 50pF
L
RO
2V/div
V
Y
- V
2V/d
40ns/div
100ns/div
-20 -15 -10 -5
0
5
10 15 20
VOLTS (V)
www.maximintegrated.com
Maxim Integrated | 7
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Pin Description
PIN
NAME
C1+
FUNCTION
MAX3160
MAX3161
MAX3162
1
2
1
2
3
4
5
1
2
3
4
5
Positive Terminal of the Positive Flying Capacitor
Positive Supply Voltage
V
CC
3
C1-
GND
Negative Terminal of the Positive Flying Capacitor
Ground
4
—
T1OUT
RS-232 Driver Output
Inverting RS-485/422 Driver Output in Full-Duplex Mode
(and Inverting RS-485/422 Receiver Input in Half-Duplex
Mode)/RS-232 Driver Output
5
—
—
6
—
6
Z(B)/T1OUT
—
—
Z
Inverting RS-485/422 Driver Output
Inverting RS-485/422 Driver Output in Full-Duplex Mode
(and Inverting RS-485/422 Receiver Input in Half-Duplex
Mode)
—
Z(B)
Noninverting RS-485/422 Driver Output in Full-Duplex
Mode (and Noninverting RS-485/422 Receiver Input in
Half-Duplex Mode)/RS-232 Driver Output
6
—
—
7
—
7
Y(A)/T2OUT
—
—
Y
Noninverting RS-485/422 Driver Output
Noninverting RS-485/422 Driver Output in Full-Duplex
Mode (and Noninverting RS-485/422 Receiver Input in
Half-Duplex Mode)
—
Y(A)
7
—
8
9
8
9
8
R1OUT
T2OUT
RS-232 Receiver Output
RS-232 Driver Output
10
—
RO/R2OUT
RS-485/422 Receiver Output/RS-232 Receiver Output
Active-Low Shutdown-Control Input. Drive low to shut
down transmitters and charge pump.
9
11
—
12
—
13
10
14
11
SHDN
R2OUT
FAST
RO
—
10
—
RS-232 Driver Output
Select slew rate limiting for both RS-232 and RS-
485/422. Slew rate limits with a logic-level low.
RS-485/422 Receiver Output
Software-Programmable Pin Functionality. Operates as
RS-485/422 with a logic-level high; operates as RS-232
with a logic-level low.
11
—
12
13
—
14
—
12
—
RS485/RS232
RE485
RS-485/422 Receiver Enable. Logic-level low enables
RS-485/422 receivers.
Software-Programmable Pin Functionality. Operates in
full-duplex mode when low; operates in half-duplex
mode when high.
HDPLX
www.maximintegrated.com
Maxim Integrated | 8
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Pin Description (continued)
PIN
NAME
FUNCTION
MAX3160
MAX3161
MAX3162
Noninverting RS-485/422 Receiver Input/RS-232
Receiver Input
13
—
—
A/R2IN
B/R1IN
RE232
Inverting RS-485/422 Receiver Input/RS-232 Receiver
Input
14
—
—
—
—
RS-232 Receiver Enable. Logic-level low enables RS-
232 receivers.
15
—
15
—
—
16
—
17
—
18
19
20
—
—
—
—
15
19
—
16
20
17
21
18
22
23
24
—
—
—
—
17
—
16
18
—
19
25
20
26
27
28
21
22
23
24
A
DE485/T2IN
TE232
B
Noninverting RS-485/422 Receiver Input
RS-485/RS-422 Driver Enable/RS-232 Driver Input
RS-232 Transmitter Output Enable
Inverting RS-485/422 Receiver Input
RS-485/RS-422 Driver Input/RS-232 Driver Input
RS-232 Receiver Input
DI/T1IN
R2IN
V-
Negative Charge-Pump Rail
R1IN
C2-
RS-232 Receiver Input
Negative Terminal of the Negative Flying Capacitor
Positive Terminal of the Negative Flying Capacitor
Positive Charge-Pump Rail
C2+
V+
T2IN
DE485
DI
RS-232 Driver Input
RS-485/RS-422 Driver Enable
RS-485/RS-422 Driver Input
T1IN
RS-232 Driver Input
www.maximintegrated.com
Maxim Integrated | 9
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Functional Diagrams
MAX3160
RS-232 MODE
RS-485 MODE
V
V
CC
CC
C1+
V+
C2+
C2-
V-
C1+
V+
1
2
20
19
18
17
16
15
14
13
12
11
1
20
C2
C3
C1
C
C1
V
V
CC
C2+
C2-
CC
2
3
19
18
17
CHARGE
PUMP
CHARGE
PUMP
C3
C2
C1-
C1-
3
C
BYPASS
BYPASS
GND
V-
GND
4
5
6
4
C4
C4
Z
T1
16
15
5
RS-485
OUTPUTS
LOGIC
INPUTS
RS-232
OUTPUTS
LOGIC
INPUTS
D
Y
T2
R1
R2
6
DE
B
A
7
14
7
LOGIC
OUTPUTS
RS-232
INPUTS
RS-485
INPUTS
R0
LOGIC
8
8
9
R
13
12
11
OUTPUT
HALF/FULL
DUPLEX
9
SHDN
FAST
HDPLX
SHDN
FAST
10
RS485/RS232
10
RS485/RS232
www.maximintegrated.com
Maxim Integrated | 10
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Functional Diagrams (continued)
MAX3161
RS-232 MODE
RS-485 MODE
V
V
CC
CC
C1+
V+
C2+
C2-
V-
C1+
V+
1
2
24
23
22
21
20
19
18
17
16
15
14
1
24
C3
C4
C3
C1
C
C1
V
V
CC
C2+
C2-
CC
2
3
4
23
22
21
CHARGE
PUMP
CHARGE
PUMP
C2
C2
C1-
C1-
3
C
BYPASS
BYPASS
GND
V-
GND
4
C4
T1
RS-232
OUTPUT
5
6
20
19
5
LOGIC
INPUTS
LOGIC
INPUTS
Z
6
RS-485
OUTPUTS
D
Y
7
8
18
17
7
DE
RS-232
INPUTS
T2
R1
R2
RS-232
OUTPUT
8
B
A
9
16
9
LOGIC
OUTPUTS
RS-485
INPUTS
R0
LOGIC
OUTPUT
10
10
R
15
14
HALF/FULL
DUPLEX
11 SHDN
12 FAST
11 SHDN
12
HDPLX
FAST
RS485/RS232 13
RS485/RS232 13
www.maximintegrated.com
Maxim Integrated | 11
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Functional Diagrams (continued)
Test Circuits
MAX3162
Y
R
V
OD
V
CC
C1+
V+
V
OC
R
1
28
C3
C1
V
C2+
C2-
CC
Z
2
3
4
27
26
25
CHARGE
PUMP
C2
C1-
Figure 1. RS-485/422 Driver DC Test Load
C
BYPASS
GND
V-
C4
T1
RS-232
5
6
7
24
23
OUTPUT
Z
1k
TEST POINT
RECEIVER
LOGIC
INPUTS
RS-485
OUTPUTS
V
CC
D
OUTPUT
S1
S2
DE485
T2
C
Y
L
22
1k
RS-232
OUTPUT
8
9
211
20
R1
RS-232
INPUTS
Figure 2. RS-485/422 Receiver Enable/Disable Timing Test Load
R2
LOGIC
OUTPUTS
10
19
B
A
11
12
18
17
RO
RE485
RS-485
INPUTS
R
3V
13 SHDN
14 FAST
16
15
TE232
DE485
C
L
Y
Z
DI
R
V
DIFF
OD
C
L
Figure 3. RS-485/422 Driver Timing Test Circuit
www.maximintegrated.com
Maxim Integrated | 12
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Test Circuits (continued)
3V
DI
1.5V
1.5V
0
t
t
DPHL
DPLH
1/2 V
O
V
CC
S1
S2
Z
500Ω
OUTPUT
UNDER TEST
V
O
Y
C
L
1/2 V
O
V
DIFF
= V - V
y
z
V
O
0
O
V
DIFF
90%
t
90%
10%
10%
-V
T
T
DF
DR
t
- t
DSKEW = | DPLH DPHL |
Figure 4. RS-485/422 Driver Enable/Disable Timing Test Load
Figure 5. RS-485/422 Driver Propagation Delays
3V
DE485
1.5V
1.5V
0
V
OH
t
t
DLZ
DZL
RO
V
/2
V /2
CC
Y, Z
CC
t
V
OUTPUT
OL
2.3V
V
V
+0.5V
-0.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
V
t
OL
RPHL
RPLH
A
B
1V
-1V
INPUT
Y, Z
0
2.3V
OH
t
t
DHZ
DZH
Figure 7. RS-485/422 Receiver Propagation Delays
Figure 6. RS-485/422 Driver Enable and Disable Times
3V
RE485
1.5V
1.5V
V
0
B
t
t
RLZ
RZL
V
CC
RO
1.5V
+ 0.5V
- 0.5V
V
RO
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
R
ID
A
C
L
RO
V
1.5V
OH
0
t
t
RHZ
RZH
Figure 8. MAX3162 RS-485/422 Receiver Enable and Disable
Times
Figure 9. RS-485/422 Receiver Propagation Delays Test Circuit
www.maximintegrated.com
Maxim Integrated | 13
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
1/4-unit load for RS-485 operation and 5kΩ for RS-232
operation.
Detailed Description
The MAX3160/MAX3161/MAX3162 3V/5V, multiprotocol
transceivers can be pin configured in a number of RS-
232 and RS-485/422 interface combinations. These cir-
cuit configurations are ideal for the design of RS-232 to
RS-485 converters, multiprotocol buses, or any applica-
tion that requires both RS-232 and RS-485 transceivers.
The slew rate of these devices is on-the-fly pin pro-
grammable, allowing reduced EMI data rates, or up to
10Mbps RS-485 communications. Power consumption
can be reduced to 1µA 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 (avail-
able in the commercial and extended temperature
ranges) facilitate board layout.
MAX3161
The MAX3161 is a 2TX/2RX RS-232 transceiver in RS-
232 mode or a single RS-485/422 transceiver in RS-485
mode. When in RS-485 mode, the unused RS-232 trans-
mitter and receiver output pins 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.
MAX3162
The MAX3162 is a 2TX/2RX RS-232 transceiver and a
single RS-485/422 transceiver simultaneously. All dri-
vers, receivers, and transmitters can be enabled or dis-
abled by pin configuration. All outputs are high-Z when
not activated. RS-232 receiver inputs are 5kΩ when
enabled, and RS-485 receiver inputs are 1/8-unit load.
Device Selection
The MAX3160/MAX3161/MAX3162 contain RS-232
transceivers and an RS-485/422 transceiver. The prima-
ry difference between the devices is the multiplexing of
the I/O pins.
FAST Mode operation
The FAST control pin is used to select the slew-rate lim-
iting of the RS-232 transmitters and the RS-485/422 dri-
vers. With FAST unasserted, the RS-232 transmitters
and the RS-485/422 driver are slew-rate limited to
reduce EMI. RS-232 data rates up to 1Mbps and RS-
485/422 data rates up to 10Mbps are possible when
FAST is asserted. FAST can be changed during opera-
tion without interrupting data communications.
The MAX3160 has common transmitter outputs and
receiver inputs for its RS-232 and RS-485/422 trans-
ceivers, and common digital I/O pins. The MAX3160 is
optimized for multiprotocol operation on a single inter-
face bus and comes in a 20-pin SSOP.
The MAX3161 has separate transmitter outputs and
receiver inputs for its RS-232 and RS-485/422 trans-
ceivers, and common digital I/O pins. The MAX3161 is
optimized for multiplexing a single UART across two
interface buses and comes in a 24-pin SSOP.
Half-Duplex RS-485/422 Operation
Asserting HDPLX places the MAX3160/MAX3161 in
half-duplex mode. The RS-485 receiver inputs are inter-
nally connected to the driver outputs. The RS-485 driver
outputs can be disabled by pulling DE485 low. HDPLX
has no affect on RS-232 operation.
The MAX3162 has separate transmitter outputs and
receiver inputs for its RS-232 and RS-485/422 trans-
ceivers, and separate digital I/O pins. The MAX3162 is
optimized for protocol translation between two interface
buses and comes in a 28-pin SSOP.
Low-Power Shutdown
The MAX3160/MAX3161/MAX3162 have an active-low
shutdown control input, SHDN. When driven low, the
charge pump and transmitters are shut down and sup-
ply current is reduced to 1µA. The RS-232 receiver out-
puts 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-485/422 mode (Figure 10).
See Tables 1–12, Functional Diagrams, and the follow-
ing descriptions for details on each device.
MAX3160
The MAX3160 is a 2TX/2RX RS-232 transceiver in RS-
232 mode, capable of RS-232-compliant communica-
tion. Assertion of RS-485/RS232 converts the device to
a single RS-485 transceiver by multiplexing the RS-232
I/O pins 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 three-stated. The receiver input
impedance is dependent on the device mode and is
Dual Charge-Pump Voltage Converter
The MAX3160/MAX3161/MAX3162s’ 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 volt-
ages (V ) over the 3.0V to 5.5V range. The charge
CC
www.maximintegrated.com
Maxim Integrated | 14
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
pumps operate in a discontinuous mode: if the magni-
tude 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 capaci-
tor (C1, C2) and a reservoir capacitor (C3, C4) to gen-
erate the V+ and V- supplies (see Functional
Diagrams).
have pullup resistors. Connect unused inputs to ground
or V
.
CC
The receivers convert RS-232 signals to CMOS-logic out-
put levels. All receivers have inverting outputs that
remain active in shutdown. The MAX3160/MAX3161/
MAX3162 permit their receiver inputs to be driven to Dia
25V. Floating receiver input signals are pulled to
ground through internal 5kΩ resistors, forcing the outputs
to a logic high. The MAX3162 has transmitter and receiv-
er enable pins that allow its outputs to be three-stated.
RS-485/422 Transceivers
The MAX3160/MAX3161/MAX3162 RS-485/422 trans-
ceivers 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 termi-
nated transmission line with all drivers disabled (see
Fail-Safe). The MAX3160/MAX3161/MAX3162 also fea-
ture pin-selectable reduced slew-rate drivers that mini-
mize EMI and reduce reflections caused by improperly
terminated cables, allowing error-free data transmission
up to 250kbps (see RS-485/422 Reduced EMI and
Reflections). The transmitters may 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 dissi-
pation. Half-duplex communication is enabled by dri-
ving HDPLX high.
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 capac-
itors for 3.3V operation. For other supply voltages, see
Table 13 for required capacitor values. Do not use val-
ues smaller than those listed in Table 13. Increasing the
capacitor values reduces ripple on the transmitter out-
puts and slightly reduces power consumption. C2, C3,
and C4 can be changed without changing C1’s value.
However, do not increase C1 without also increas-
ing the values of C2, C3, C4, and C
tain the proper ratios to the other capacitors.
to main-
BYPASS
Fail-Safe
The MAX3160/MAX3161/MAX3162 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 volt-
age (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 GND by the termination. This results in a logic
high with a 50mV minimum noise margin. Unlike other
fail-safe devices, the -50mV to -200mV threshold com-
plies with the 200mV EIA/TIA-485 standard.
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
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 V
to ground with a capacitor of the same
CC
value as reservoir capacitors C2, C3, and C4. Connect
the bypass capacitor as close to the IC as possible.
RS-232 Transceivers
RS-232 Transmitter Outputs
The MAX3160/MAX3161/MAX3162 RS-232 transmitters
are inverting-level translators that convert CMOS-logic
levels to 5.0V EIA/TIA-232-compliant levels. The trans-
mitters 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 MAX3160/
MAX3161/MAX3162 outputs are high impedance and
can be driven to 12V. The transmitter inputs do not
when Exiting Shutdown
Figure 10 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (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 undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when V- exceeds
approximately -3V.
www.maximintegrated.com
Maxim Integrated | 15
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Truth Tables
RS-232 Transmitters
RS-232 Receivers
Table 1. MAX3160
Table 4. MAX3160
INPUTS
OUTPUTS
INPUTS
OUTPUTS
RS485
RS232
DI/T1IN,
DE485/T2IN
Z(B)/T1OUT,
Y(A)/T2OUT
RS-485/
RS-232
B/R1IN,
A/R2IN
R1OUT,
RO/R2OUT
SHDN
SHDN
0
1
1
1
X
0
0
1
X
0
1
X
1/8 Unit Load
X
X
X
0
0
0
0
1
0
1
1
1
0
Inputs Open
RS-485 Mode
R1OUT
High-Z,
X
1
X
RO/R2OUT in
RS-485 mode
Table 2. MAX3161
INPUTS
OUTPUTS
Table 5. MAX3161
RS-485/
SHDN
DI/T1IN,
DE485/T2IN
T1OUT,
T2OUT
RS-232
INPUTS
OUTPUTS
0
1
1
1
X
0
0
1
X
0
1
X
High-Z
RS-485/
SHDN
R1OUT,
RO/R2OUT
R1IN, R2IN
RS-232
1
0
X
X
X
0
0
0
0
1
0
1
1
High-Z
Inputs Open
R1OUT
High-Z,
Table 3. MAX3162
X
1
X
INPUTS
OUTPUTS
RO/R2OUT in
RS-485 mode
T1OUT,
T2OUT
High-Z
High-Z
1
SHDN
TE232
T1IN,T2IN
0
X
1
1
X
0
1
1
X
X
0
1
Table 6. MAX3162
INPUTS
OUTPUTS
R1OUT,
R2OUT
0
SHDN
RE232
R1IN, R2IN
X
X
X
X
1
0
0
0
X
High-Z
High Data Rates
0
1
0
1
The MAX3160/MAX3161/MAX3162 maintain the RS-232
5.0V required minimum transmitter output voltage even
at high data rates. Figure 11 shows a transmitter loop-
back test circuit. Figure 12 shows a loopback test result
at 250kbps, and Figure 13 shows the same test at
1000kbps. Figure 12 demonstrates a single slew-rate
limited transmitter driven at 250kbps (FAST = GND) into
an RS-232 load in parallel with 1000pF. Figure 13 shows
1
Inputs open
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 MAX3160 has a 1/4-unit load receiv-
er input impedance (48kΩ), allowing up to 128 trans-
ceivers to be connected in parallel on one
communication line. The MAX3161/MAX3162 have a
1/8-unit load receiver input impedance (96kΩ), allowing
up to 256 transceivers to be connected in parallel on
a single transmitter driven at 1Mbps (FAST asserted),
loaded with an RS-232 receiver in parallel with 1000pF.
These transceivers maintain the RS-232 5.0V minimum
transmitter output voltage at data rates up to 1Mbps.
www.maximintegrated.com
Maxim Integrated | 16
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Truth Tables (continued)
RS-485/422 Drivers
Table 7. MAX3160
INPUTS
OUTPUTS
RS232
SHDN
RS485/
DE485/T2IN
DI/T1IN
Z(B)/T1OUT
Y(A)/T2OUT
0
1
1
1
X
1
X
0
1
1
X
X
X
0
1
X
1/8 Unit Load
1/8 Unit Load
1
1
1
0
1/8 Unit Load
1/8 Unit Load
1
0
0
1
RS-232 Mode
Table 8. MAX3161
INPUTS
RS232
OUTPUTS
SHDN
RS485/
DE485/T2IN
DI/T1IN
Z(B)
1/8 Unit Load
1/8 Unit Load
1/8 Unit Load
1
Y(A)
1/8 Unit Load
1/8 Unit Load
1/8 Unit Load
0
0
X
X
1
1
X
0
X
1
1
X
X
0
1
1
X
X
X
0
1
0
1
Table 9. MAX3162
INPUTS
OUTPUTS
SHDN
DE485
DI
X
X
0
Z
High-Z
High-Z
1
Y
High-Z
High-Z
0
0
X
1
1
X
0
1
1
1
0
1
RS-485/422 Receivers
Table 10. MAX3160
INPUTS
OUTPUT
RS485/RS232
SHDN
HDPLX
A - B*
Y - Z*
RO/R2OUT
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
X
X
0
0
0
1
1
1
X
X
X
High-Z Up to V
CC
≥-50mV
X
1
0
1
1
0
1
≤-200mV
X
X
Floating
X
X
X
X
≥-50mV
≤-200mV
Floating
X
RS-232 Mode
*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
Maxim Integrated | 17
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Truth Tables (continued)
Table 11. MAX3161
INPUTS
OUTPUT
RS485/RS232
SHDN
HDPLX
A - B
Y(A) - Z(B)
RO/R2OUT
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
X
X
0
0
0
1
1
1
X
X
X
High-Z up to V
CC
ꢀ-50mV
X
1
0
1
1
0
1
ꢁ-200mV
X
X
Floating
X
X
X
X
ꢀ-50mV
ꢁ-200mV
Floating
X
RS-232 Mode
Table 13. Required Minimum
Capacitance Values
Table 12. MAX3162
INPUTS
OUTPUT
SUPPLY VOLTAGE
(V)
C2, C3, C4, C
BYPASS
SHDN
RE485
A - B
X
RO
C1 (µF)
(µF)
0
X
1
1
1
X
1
0
0
0
High-Z
+3.0 TO +3.6
+4.5 TO +5.5
+3.0 TO +5.5
0.1
0.047
0.1
0.1
X
High-Z
0.33
0.47
ꢀ-50mV
ꢁ-200mV
Inputs Open
1
0
1
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.
mal shutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature becomes
excessive.
The MAX3160/MAX3161/MAX3162 RS-485 driver out-
puts are 1/8-unit load when disabled This impedance
may be reduced if the D1 pin is toggled at a high fre-
Protection Against Wiring Faults
EIA/TIA-485 standards require a common input voltage
range of -7V to +12V to prevent damage to the device.
The MAX3160/MAX3161/MAX3162 inputs are protected
to RS-232 levels of 25V for the receiver inputs and
13.2V for the transmitter/driver outputs. This provides
additional protection for the RS-485 transceivers
against ground differential or faults due to miswiring.
quency. With no power applied (V
= GND), the RS-
CC
485 transmitter output impedances typically go to 1/2-
unit load on the MAX3161/MAX3162, and to one-unit
load on the MAX3160.
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus con-
tention. The first, a foldback current limit on the output
stage, provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
Typical Operating Characteristics). The second, a ther-
RS-485/422 Reduced EMI and Reflections
The MAX3160/MAX3161/MAX3162 can be configured
for slew-rate limiting by pulling FAST low. This minimizes
EMI and reduces reflections caused by improperly ter-
minated cables. Operation in slew-rate limited mode
reduces the amplitudes of high-frequency harmonics.
www.maximintegrated.com
Maxim Integrated | 18
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
MAX 3160-2 FIG10
SHDN
MAX 3160-2 FIG12
5V/division
T
IN
T1OUT
2V/div
T
OUT
5V/div
GND
T2OUT
2V/div
R
OUT
40μs/div
1μs/div
Figure 12. RS-232 Loopback Test Result at 250kbps, FAST =
Low
Figure 10. MAX3160 RS-232 Transmitter Outputs When Exiting
Shutdown
MAX 3160-2 FIG13
V
CC
C
BYPASS
T
IN
V
CC
C1+
T
OUT
V+
V-
C1
C2
C3
C4
C1-
C2+
5V/div
MAX3160
MAX3161
MAX3162
C2-
R
OUT
T_ OUT
R_ IN
T_ IN
200ns/div
Figure 13. RS-232 Loopback Test Result at 1000kbps, FAST =
High
R_ OUT
SHDN
1000pF
5k
tion 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 RS-485 signal on
Z and Y. RS-485 signals received on A and B are trans-
mitted as an RS-232 signal on T1OUT.
V
CC
GND
Figure 11. Loopback Test Circuit
RS-485/422 Line Length vs. Data Length
The RS-485/422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, use
the repeater application shown in Figure 14.
Multiprotocol Bus
The Typical Operating Circuit shows a standard appli-
cation for the MAX3160. The MAX3160’s output pins
are multiplexed between RS-232 and RS-485 protocols
by a microprocessor (µP). The µP also directs the shut-
down functions, enable lines, and the duplex of the
MAX3160. Data is transmitted to the MAX3100 UART
RS-232/RS-485 Protocol Translator
Figure 15 shows the MAX3162 configured as an RS-
232/RS-485 protocol translator. The direction of transla-
SPI is a trademark of Motorola, Inc.
www.maximintegrated.com
Maxim Integrated | 19
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
3.3V
MAX3160
MAX3161
MAX3162
C
BYPASS
100nF
A
B
120Ω
120Ω
RO
RE485
R
DATA IN
2
27
26
V
CC
1
3
C2+
C1+
C1-
C2
100nF
C1
100nF
DE485
MAX3162
C2-
Z
13
5
SHDN
DI
D
DATA OUT
Y
24
RCV
T1OUT
T1IN
10
23
11
9
R2OUT
DI
RO
R1OUT
12
22
RE485
DE485
19
20
TX
R2IN
R1IN
NOTE: RE485 ON MAX3162 ONLY
17
RTS
A
18
6
15
16
14
28
RE232
TE232
B
Z
Figure 14. RS-485 Line Repeater
7
Y
FAST
V+
25
V-
through an SPI™ port. The UART asynchronously
transfers data through the MAX3160 to the pin-selected
RS-232 or RS-485 protocol; see Table 14 for commonly
used cable connections.
GND
4
C3
100nF
C4
100nF
Multiprotocol Bus Multiplexer
The Typical Application Circuit shows the MAX3161 con-
figured as a multiprotocol bus multiplexer. The MAX3161
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 mul-
tidrop RS-485 interface. The MAX3100 UART asynchro-
nously transfers data through the MAX3161 to the
pin-selected RS-232 or RS-485 protocol.
Figure 15. Protocol Translator
www.maximintegrated.com
Maxim Integrated | 20
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Table 14. Cable Connections Commonly Used for EIA/TIA-232 and
V.24 Asynchronous Interfaces
MAX3160
MAX3161
MAX3162
EIA/TIA-232
STANDARD
CONNECTOR
PIN
PIN NUMBER
MAX3161
FUNCTION
(as seen by DTE)
EQUIVALENT
MAX3160
MAX3162
DCD
1
2
3
4
5
6
Data Carrier Detect
RD
R2IN
13
5
17
5
19
5
Received Data
TD
T1OUT
Transmitted Data
Data Terminal Ready
Signal Ground
DTR
SG
GND
4
4
4
DSR
Data Set Ready
Request to Send (= DTE
ready)
RTS
7
T2OUT
R1IN
6
8
8
CTS
RI
8
9
14
18
20
Clear to Send (= DCE ready)
Ring Indicator
Typical Application Circuit
+
2
14
DB9
V
HDPLX
CC
RS-232
T1OUT
5
TX
13
DI/T1IN
20
R2IN
RO/R2OUT
RX
MAX3100
10
DE/T2IN
17
T2OUT
UART
12
11
RTS
MAX3161
8
19
R1OUT
9
R1IN
18
CTS
10
1
RJ45
RS-485
Y(A)
7
SPI
Z(B)
6
GND
FAST
12
SHDN
4
μP
RS-485/RS-232
SHDN
www.maximintegrated.com
Maxim Integrated | 21
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Pin Configurations
TOP VIEW
+
+
+
C1+
1
2
3
4
5
6
7
8
9
24 V+
C1+
1
2
3
4
5
6
7
8
9
20 V+
C1+
1
2
3
4
5
6
7
8
9
28 V+
V
CC
19 C2+
V
23 C2+
CC
V
CC
27 C2+
26 C2-
25 V-
C1-
GND
22 C2-
C1-
GND
18 C2-
C1-
GND
T1OUT
Z
21 V-
17 V-
MAX3161
MAX3160
Z(B)/T1OUT
Y(A)/T2OUT
R1OUT
16 DI/T1IN
15 DE485/T2IN
T1OUT
Z(B)
20 DI/T1IN
19 DE485/T2IN
18 R1IN
17 R2IN
24 T1IN
23 DI
MAX3162
14
Y(A)
B/R1IN
Y
22 DE485
21 T2IN
20 R1IN
19 R2IN
RO/R2OUT
SHDN
13 A/R2IN
T2OUT
R1OUT
T2OUT
R1OUT
12 HDPLX
16
15
B
A
FAST 10
11 RS-485/RS-232
RO/R2OUT 10
SHDN 11
R2OUT 10
RO 11
14 HDPLX
18
17
B
A
20-PIN SSOP
FAST 12
13 RS-485/RS-232
RE485 12
SHDN 13
FAST 14
16 TE232
15 RE232
24-PIN SSOP
28-PIN SSOP
Selector Guide
Chip Information
PROCESS: BiCMOS
FLOW-
THROUGH
PIN-OUT
RS-485
INPUT UNIT
LOADS
PART
DUAL-MODE
Package Information
MAX3160
MAX3161
MAX3162
No
No
Yes
No
1/4
1/8
1/8
For the latest package outline information and land patterns (foot-
prints), 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.
Yes
Yes
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
20 SSOP
24 SSOP
28 SSOP
A20+1
A24+3
A28+3
21-0056
21-0056
21-0056
www.maximintegrated.com
Maxim Integrated | 22
+3.0V to+5.5V, 1µA, RS-232/
MAX3160/MAX3161/MAX3162
RS-485/422 Multiprotocol Transceivers
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
12/09
5/15
Corrected the “Continuous Power Dissipation” specifications under the Absolute
2
11
22
1
Maximum Ratings.
2
3
Changed pin labels in the Functional Diagrams.
Deleted “TRANSISTOR COUNT: 1580” and added “PROCESS: BiCMOS” to the Chip
Information.
Updated the General Description and Benefits and Features sections
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. | 23
相关型号：
MAX3161CAG+T
Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, PDSO24, 5.30 MM, 0.65 MM PITCH, SSOP-24
MAXIM
MAX3161E
+5kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers
MAXIM
MAX3161ECAG
+5kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers
MAXIM
MAX3161ECAG+
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, CMOS, PDSO24, 5.30 MM, MO-150, SSOP-24
MAXIM
MAX3161EEAG
+5kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers
MAXIM
©2020 ICPDF网 联系我们和版权申明