MAX3160CAP+ [MAXIM]
+3.0V to+5.5V, 1μA, RS-232/RS-485/422 Multiprotocol Transceivers; + 3.0V至+ 5.5V , 1μA , RS - 232 / RS - 485/422多协议收发型号: | MAX3160CAP+ |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | +3.0V to+5.5V, 1μA, RS-232/RS-485/422 Multiprotocol Transceivers |
文件: | 总23页 (文件大小:447K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-1722; Rev 2; 12/09
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
General Description
Features
The MAX3160/MAX3161/MAX3162 are programmable
RS-232/RS-485/422 multiprotocol transceivers. 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.
♦ Single-Supply Operation from +3V to +5.5V
♦ Pin-Programmable as 2TX/2RX RS-232 or Single
RS-485/422 (MAX3160/MAX3161)
♦ 2TX/2RX RS-232 and Single RS-485/422
(MAX3162)
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. The receivers
feature true fail-safe circuitry that guarantees a logic-
high receiver output when the receiver inputs are open
or shorted. These devices also feature pin-selectable
transmitter slew rates for both RS-232 and RS-485/422
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-485/422
mode and up to 1Mbps in RS-232 mode. The
MAX3160/MAX3161/MAX3162 feature a 1µA shutdown
mode, and short-circuit limiting and thermal shutdown
circuitry to protect against excessive power dissipation.
♦ Pin-Programmable RS-232/RS-485 Transmitter
Slew Rates Reduce EMI
♦ 10Mbps RS-485 and 1Mbps RS-232 Data Rates
♦ Pin-Programmable Half-Duplex or Full-Duplex
RS-485/422 Operation (MAX3160/MAX3161)
♦ RS-485/422 True Fail-Safe Receivers
♦ Transmitters and Receivers Protected Against
Wiring Faults
♦ 1μA Shutdown Supply Current
♦ 1/8-Unit Load Allows up to 256 Transceivers on
the Bus
The MAX3160/MAX3162 offer a flow-through pinout that
facilitates board layout. The MAX3160/MAX3161/
MAX3162 are available in tiny SSOP packages and
operate over the commercial and extended tempera-
ture ranges.
Typical Operating Circuit
________________________Applications
Point-of-Sales Equipment
Peripherals
+3V TO +5.5V
Industrial Controls
Networking
1
RS-232 to RS-485
DB9
V
CC
Interface Converters
RS485/RS232
11
DI/T1IN
Z(B)/T1OUT
TX
13
5
Ordering Information
16
Y(A)/T2OUT
DE/T2IN
RTS
RX
MAX3160
6
MAX3100
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
20 SSOP
11
12
15
A/R2IN
RO/R2OUT
8
MAX3160CAP+
MAX3160EAP+
MAX3161CAG+
MAX3161EAG+
MAX3162CAI+
13
B/R1IN
CTS
R1OUT
7
20 SSOP
14
10
24 SSOP
GND FAST HDPLX SHDN
SPI
4
10
9
12
RJ45
24 SSOP
28 SSOP
MAX3162EAI+
-40°C to +85°C
28 SSOP
SHDN
μP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
ABSOLUTE MAXIMUM RATINGS
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 10ꢀ;
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
MIN
PARAMETER
DC CHARACTERISTICS
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
0/MAX3162
MAX3160/MAX3161, no load,
RS485/RS232 = GND
1.2
2.5
V
Standby Current
I
I
mA
µA
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
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
2
_______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
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 10ꢀ;
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
MIN
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
_______________________________________________________________________________________
3
+3.0V to+5.5V, 1µA, RS-232/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 10ꢀ;
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX 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
0/MAX3162
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
R
= 54Ω, C = 50pF, Figures 3, 5
200
200
400
400
800
800
ns
ns
DIFF
DIFF
L
DPLH
t
t
,
DPHL
= 54Ω, C = 50pF, Figures 3, 5
L
DPLH
Driver Propagation Delay Skew
Driver Output Enable Time
Driver Output Disable Time
t
R
R
R
= 54Ω, C = 50pF, Figure 3, 5
200
800
400
ns
ns
ns
DSKEW
DIFF
DIFF
DIFF
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
4
_______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
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 10ꢀ;
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
MIN
PARAMETER
SYMBOL
CONDITIONS
C = 50pF, Figures 2, 8
MIN
TYP
MAX
UNITS
Receiver Output Enable Time
Receiver Output Disable Time
t
t
, t
100
ns
RZL RZH
L
, 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
R
R
R
= 54Ω, C = 50pF, Figures 3, 5
25
10
ns
ns
ns
ns
DR DF
DIFF
DIFF
DIFF
DIFF
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,
A
CC
unless otherwise noted.)
RS-232 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (FAST =
RS-232 TRANSMITTER OUTPUT VOLTAGE vs.
LOAD CAPACITANCE (FAST = GND)
RS-232 TRANSMITTER SLEW RATE vs.
LOAD CAPACITANCE (FAST = GND)
V
)
CC
10.0
7.5
10.0
7.5
18
16
14
12
10
8
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
500
1000
1500
2000
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
5
+3.0V to+5.5V, 1µA, RS-232/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,
CC
A
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
3.0
2.5
2.0
1.5
1.0
0
60
50
40
30
20
10
0
1Mbps
RS-485 MODE
RS-232 MODE
250kbps
20kbps
0
500
1000
1500
2000
-40
-15
10
35
60
85
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
LOAD CAPACITANCE (pF)
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
0/MAX3162
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
-7
-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
100
RS-485/422 DRIVER DIFFERENTIAL OUTPUT
vs. TEMPERATURE
OUTPUT CURRENT vs. RECEIVER
OUTPUT LOW VOLTAGE
3.5
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
-40
-15
10
35
60
85
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (°C)
6
_______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
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.)
OUTPUT CURRENT vs. RECEIVER
RS-485/422 RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
RS-485/422 DRIVER PROPAGATION DELAY
vs.TEMPERATURE (FAST)
OUTPUT HIGH VOLTAGE
14
12
10
8
120
85
80
75
70
65
60
55
50
C = 50pF
L
R = 50Ω
100
80
60
40
20
0
RISING
FALLING
6
4
2
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
RS-485/422 DRIVER PROPAGATION
(SLOW, 250kbps)
RS-485/422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (SLOW)
RS-485/422 DRIVER PROPAGATION
(FAST, 10Mbps)
MAX3160/2 TOC21
MAX3160/2 TOC20
500
480
460
440
420
400
380
360
340
320
300
R = 50Ω
DI
5V/div
DI
5V/div
V -V
Y
Z
2V/div
V -V
Y
Z
2V/div
1.0μs/div
-40
-15
10
35
60
85
20ns/div
TEMPERATURE (°C)
RS-485/422 DRIVER DISABLE/ENABLE
RS-485/422 RECEIVER PROPAGATION
I-V OUTPUT IMPEDANCE CURVE
IN RS-232 SHUTDOWN MODE
TO DRIVER OUTPUT
(FAST, 5Mbps)
MAX3160/2 TOC24
MAX3160/2 TOC22
400
200
DE485
2V/div
V -V
2V/div
Y
Z
0
R = 50Ω
L
C = 82pF
-200
-400
-600
-800
-1000
C = 50pF
L
RO
2V/div
V
- V
Z
Y
2V/div
100ns/div
-20 -15 -10 -5
0
5
10 15 20
40ns/div
VOLTS (V)
_______________________________________________________________________________________
7
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
Pin Description
PIN
NAME
FUNCTION
MAX3160
MAX3161
MAX3162
1
2
1
2
3
4
5
1
2
3
4
5
C1+
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)
0/MAX3162
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
8
_______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
Pin Description (continued)
PIN
NAME
A/R2IN
B/R1IN
RE232
FUNCTION
MAX3160
MAX3161
MAX3162
Noninverting RS-485/422 Receiver Input/RS-232
Receiver Input
13
—
—
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
_______________________________________________________________________________________
9
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
Functional Diagrams
MAX3160
RS-232 MODE
RS-485 MODE
V
CC
V
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
CC
V
CC
C2+
C2-
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
RS-485/RS-232
10
RS-485/RS-232
0/MAX3162
10 ______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
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
CC
V
CC
C2+
C2-
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
RS-485/RS-232 13
RS-485/RS-232 13
______________________________________________________________________________________ 11
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
Functional Diagrams (continued)
Test Circuits
MAX3162
Y
R
V
OD
V
CC
C1+
V+
1
28
V
R
OC
C3
C1
V
C2+
C2-
CC
2
3
4
27
26
25
Z
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
D
V
CC
OUTPUT
DE485
T2
Y
S1
22
C
L
1k
RS-232
OUTPUT
8
9
211
20
S2
R1
RS-232
INPUTS
R2
Figure 2. RS-485/422 Receiver Enable/Disable Timing Test Load
LOGIC
OUTPUTS
10
19
B
A
11
12
18
17
0/MAX3162
RO
RE485
RS-485
INPUTS
R
3V
13 SHDN
14 FAST
16
15
TE232
DE485
C
L
Y
Z
DI
R
DIFF
V
OD
C
L
Figure 3. RS-485/422 Driver Timing Test Circuit
12 ______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
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
OL
t
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
ID
RO
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
R
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
______________________________________________________________________________________ 13
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
MAX3161
Detailed Description
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
transmitter 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.
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.
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 pri-
mary 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.
0/MAX3162
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 dri-
ver 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/RS-232 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
1/4-unit load for RS-485 operation and 5kΩ for RS-232
operation.
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
pumps operate in a discontinuous mode: if the magni-
tude of either output voltage is less than 5.5V, the
14 ______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
charge pumps are enabled; if the magnitude of both
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 out-
puts to a logic high. The MAX3162 has transmitter and
receiver enable pins that allow its outputs to be three-
stated.
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).
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 ter-
minated 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 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 dissipation. Half-duplex com-
munication is enabled by driving 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
capacitors for 3.3V operation. For other supply volt-
ages, 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 con-
sumption. 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
usually rises at low temperatures, influences the
amount of ripple on V+ and V-.
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.
Power-Supply Decoupling
In applications that are sensitive to power-supply noise,
decouple V
to ground with a capacitor of the same
CC
RS-232 Transceivers
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
have pullup resistors. Connect unused inputs to ground
value as reservoir capacitors C2, C3, and C4. Connect
the bypass capacitor as close to the IC as possible.
RS-232 Transmitter Outputs
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.
or V
.
CC
______________________________________________________________________________________ 15
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
Truth Tables
RS-232 Receivers
RS-232 Transmitters
Table 4. MAX3160
INPUTS
OUTPUTS
R1OUT,
RO/R2OUT
Table 1. MAX3160
RS-485/
B/R1IN,
A/R2IN
INPUTS
OUTPUTS
SHDN
RS-232
RS485
RS232
DI/T1IN,
DE485/T2IN
Z(B)/T1OUT,
Y(A)/T2OUT
SHDN
X
X
X
0
0
0
0
1
0
1
1
0
1
1
1
X
0
0
1
X
0
1
X
1/8 Unit Load
Inputs Open
1
R1OUT
High-Z,
0
RS-485 Mode
X
1
X
RO/R2OUT in
RS-485 mode
Table 5. MAX3161
Table 2. MAX3161
INPUTS
OUTPUTS
INPUTS
OUTPUTS
RS-485/
SHDN
R1OUT,
RO/R2OUT
R1IN, R2IN
RS-232
RS-485/
SHDN
DI/T1IN,
DE485/T2IN
T1OUT,
T2OUT
RS-232
X
X
X
0
0
0
0
1
0
1
0
1
1
1
X
0
0
1
X
0
1
X
High-Z
1
1
0
Inputs Open
R1OUT
High-Z,
1
High-Z
X
1
X
RO/R2OUT in
RS-485 mode
Table 6. MAX3162
Table 3. MAX3162
INPUTS
OUTPUTS
INPUTS
OUTPUTS
R1OUT,
R2OUT
T1OUT,
T2OUT
High-Z
High-Z
1
SHDN
RE232
R1IN, R2IN
SHDN
TE232
T1IN,T2IN
0
X
1
1
X
0
1
1
X
X
0
1
X
X
X
X
1
0
0
0
X
High-Z
0
1
0
1
1
0
Inputs open
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.
High Data Rates
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
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-
16 ______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
Truth Tables (continued)
RS-485/422 Drivers
Table 7. MAX3160
INPUTS
RS232
OUTPUTS
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)
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
1/8 Unit Load
1/8 Unit Load
1/8 Unit Load
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.
______________________________________________________________________________________ 17
+3.0V to+5.5V, 1µA, RS-232/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
SHDN
RE485
A - B
X
RO
SUPPLY VOLTAGE
(V)
C2, C3, C4, C
(µF)
BYPASS
C1 (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
0/MAX3162
ceivers to be connected in parallel on one communica-
tion 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 one com-
munication 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.
Typical Operating Characteristics). The second, a ther-
mal shutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature becomes
excessive.
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.
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-
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.
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.
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
18 ______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
MAX 3160-2 FIG10
MAX 3160-2 FIG12
SHDN
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
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
V
CC
GND
received on R
is transmitted as an RS-485 signal on
Figure 11. Loopback Test Circuit
2IN
Z and Y. RS-485 signals received on A and B are trans-
mitted as an RS-232 signal on T
.
1OUT
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
through an SPI™ port. The UART asynchronously
RS-232/RS-485 Protocol Translator
Figure 15 shows the MAX3162 configured as an RS-
232/RS-485 protocol translator. The direction of transla-
tion is controlled through the RTS signal (R1IN). The
______________________________________________________________________________________ 19
+3.0V to+5.5V, 1µA, RS-232/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
C2-
MAX3162
13
5
Z
SHDN
DI
D
DATA OUT
24
Y
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-
transfers data through the MAX3160 to the pin-selected
RS-232 or RS-485 protocal; see Table 14 for commonly
used cable connections.
GND
4
C3
100nF
C4
100nF
0/MAX3162
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
SPI is a trademark of Motorola, Inc.
20 ______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
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
TX
DI/T1IN
13
5
20
R2IN
17
T2OUT
RO/R2OUT
RX
MAX3100
UART
10
DE/T2IN
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
______________________________________________________________________________________ 21
+3.0V to+5.5V, 1µA, RS-232/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
19 C2+
V
23 C2+
CC
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
0/MAX3162
Selector Guide
Chip Information
PROCESS: BiCMOS
FLOW-
THROUGH
PIN-OUT
RS-485
INPUT UNIT
LOADS
PART
DUAL-MODE
Package Information
For the latest package outline information and land patterns,
go to www.maxim-ic.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.
MAX3160
MAX3161
MAX3162
No
No
Yes
No
1/4
1/8
1/8
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
22 ______________________________________________________________________________________
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
0/MAX3162
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
Corrected the “Continuous Power Dissipation” specifications under the Absolute
Maximum Ratings.
2
2
12/09
Changed pin labels in the Functional Diagrams.
11
22
Deleted “TRANSISTOR COUNT: 1580” and added “PROCESS: BiCMOS” to the Chip
Information.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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