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19-1722; Rev 2; 12/09
KIT ATION EVALU ABLE AVAIL
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
General Description Features
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) 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 1A Shutdown Supply Current 1/8-Unit Load Allows up to 256 Transceivers on the Bus
MAX3160/MAX3161/MAX3162
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. All devices incorporate a proprietary low-dropout transmitter output stage and an on-board dual charge pump to allow RS-232 and RS-485/422 compliant performance from a +3V to +5.5V supply. The receivers feature true fail-safe circuitry that guarantees a logichigh 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 1A shutdown mode, and short-circuit limiting and thermal shutdown circuitry to protect against excessive power dissipation. 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 temperature ranges.
Typical Operating Circuit
+3V TO +5.5V
________________________Applications
Point-of-Sales Equipment Industrial Controls RS-232 to RS-485 Interface Converters Peripherals Networking
1 VCC RS485/RS232 11 TX 13 MAX3100 11 DI/T1IN MAX3160 Z(B)/T1OUT 5 Y(A)/T2OUT 6 A/R2IN 13 B/R1IN 14 GND FAST HDPLX SHDN SPI 4 10 12 9 RJ45 DB9
Ordering Information
PART MAX3160CAP+ MAX3160EAP+ MAX3161CAG+ MAX3161EAG+ MAX3162CAI+ MAX3162EAI+ TEMP RANGE 0C to +70C -40C to +85C 0C to +70C -40C to +85C 0C to +70C -40C to +85C PIN-PACKAGE 20 SSOP 20 SSOP 24 SSOP 24 SSOP 28 SSOP 28 SSOP
P
16 RTS DE/T2IN
15 RX RO/R2OUT 8 12 CTS R1OUT 10 7
SHDN
+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, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
ABSOLUTE MAXIMUM RATINGS
VCC to GND. .............................................................-0.3V to +6V V+ to GND ................................................................-0.3V to +7V V- to GND....................................................................0.3V to -7V 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......................................13.2V R2OUT, R1OUT, RO to GND................-0.3V to (VCC + 0.3V) Output Short-Circuit Duration T1OUT, T2OUT, Y, Z ............................................Continuous Continuous Power Dissipation (TA = +70C) 20-Pin SSOP (derate 11.9W/C above +70C) ..........952mW 24-Pin SSOP (derate 14.9W/C above +70C) ........1195mW 28-Pin SSOP (derate 15W/C above +70C) ...........1201mW Operating Temperature Ranges MAX316_CA_ ....................................................0C to +70C MAX316_EA_ .................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
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
(VCC = +3V to +5.5V, C1-C4 = 0.1F when tested at +3.3V 10%; C1 = 0.047F and C2, C3, C4 = 0.33F when tested at +5V10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER DC CHARACTERISTICS SYMBOL CONDITIONS MAX3160/MAX3161, no load, RS485/ RS232 = GND VCC Standby Current ICC MAX3160/MAX3161, no load, RS485/ RS232 = VCC MAX3162 No Load VCC Shutdown Current ICC SHDN = GND, receiver inputs open or grounded MIN TYP MAX UNITS
1.2 2.5 3.0 1
2.5 5.5 6 10 A mA
R TRANSMITTER AND LOGIC INPUTS (DI, T1IN, T2IN, DE485, R E4 8 5, TE232, R E 2 3 2 , FAST, HDPLX, SHDN, RS485/R S 232) Logic Input Low Logic Input High Logic Input Leakage Current Transmitter Logic Hysteresis Receiver Output Voltage Low Receiver Output Voltage High Receiver Output Short Circuit Current Receiver Output Leakage Current VIL VIH IINL VHYS VOL VOH IOSR IOZR IOUT = 2.5mA IOUT = -1.5mA 0 < VO < VCC Receivers disabled VCC - 0.6 20 0.05 60 1 VCC = +3.3V VCC = +5V 2.0 2.4 0.01 0.5 0.4 1 0.8 V V A V V V mA A
RS-232 AND RS-485/422 RECEIVER OUTPUTS (R1OUT, R2OUT, RO)
2
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, C1-C4 = 0.1F when tested at +3.3V 10%; C1 = 0.047F and C2, C3, C4 = 0.33F when tested at +5V10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER SYMBOL RS-232 RECEIVER INPUTS (R1IN, R2IN) Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance RS-485/422 RECEIVER INPUTS (NOTE 2) MAX3160 Input Resistance RIN -7V < VCM < +12V MAX3161/ MAX3162 VCM = +12V VCM = -7V VCM = +12V VCM = -7V -200 30 Both transmitter outputs loaded with 3k to GND VCC = V+ = V- = 0V, VT1OUT = VT2OUT = +2V T_OUT = GND VOUT = 12V TE232 = GND or SHDN = GND MAX3160/ MAX3161 MAX3162 R = 27 (RS-485) Differential Output Voltage VOD Figure 1 R = 50 (RS-422) R = 27 or 50, Figure 1 R = 27 or 50, Figure 1 2 48 96 0.25 -0.15 0.125 -0.075 -50 mV mV mA k 3 VCC = +3.3V VCC = +5V VCC =+3.3V VCC = +5V 0.5 5 7 CONDITIONS MIN -25 0.6 0.8 2.0 2.4 TYP MAX 25 UNITS V V V V k
MAX3160/MAX3161/MAX3162
MAX3160 Input Current IIN MAX3161/MAX3162 Input Differential Threshold Input Hysteresis VTH VTH
RS-232 TRANSMITTER OUTPUTS (T1OUT, T2OUT) Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current RS-485/422 TRANSMITTER OUTPUTS (Y, Z) 1.5 V 5 300 5.4 10M 30 60 125 25 V mA A
Change in Magnitude of Differential Output Voltage for Complementary Output States Common Mode Output Voltage Change in Magnitude of Common Mode Output Voltage for Complementary Output States
VOD VOC
-0.2
0.2 3
V V
VOC
R = 27 or 50, Figure 1
0.2
V
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3
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, C1-C4 = 0.1F when tested at +3.3V 10%; C1 = 0.047F and C2, C3, C4 = 0.33F when tested at +5V10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Output Short-Circuit Current Output Leakage Current SYMBOL ISC IO CONDITIONS VY or VZ = +12V to -7V VY or VZ = +12V, DE485 = GND or SHDN = GND MAX3160/ MAX3161 MAX3162 250 0.15 200 200 |tPHL - tPLH| |tPLH - tPHL| VCC = +3.3V, TA = +25C, RL =3k to 7k, measured from +3.0V or -3.0V to +3.0V CL = 150pF to 1000pF CL = 150pF to 2500pF 6 4 100 50 30 V/s 30 MIN TYP MAX 250 125 25 kbps s ns ns ns ns UNITS mA A
RS-232 TIMING CHARACTERISTICS (FAST = GND, 250kbps, ONE TRANSMITTER SWITCHING) Maximum Data Rate Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew RL = 3k, CL = 1000pF R_IN to R_OUT, CL = 150pF
Transition-Region Slew Rate
RS-232 TIMING CHARACTERISTICS (FAST = VCC, 1Mbps, ONE TRANSMITTER SWITCHING) VCC = +3V to +4.5V, RL = 3k, CL = 250pF Maximum Data Rate Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew Transition-Region Slew Rate |tPHL - tPLH| |tPLH - tPHL| VCC = +3.3V, TA = +25C, RL =3k to 7k, CL = 150pF to 1000pF, measured from +3.0V or -3.0V to +3.0V 24 VCC = +4.5V to +5.5V, RL = 3k, CL = 1000pF R_IN to R_OUT, CL = 150pF 1 1 0.15 200 200 25 50 150 Mbps s ns ns ns ns V/s
RS-485/422 TIMING CHARACTERISTICS (FAST = GND) 250kbps Driver Propagation Delay Driver Rise and Fall Time Driver Propagation Delay Skew Driver Output Enable Time Driver Output Disable Time Receiver Propagation Delay Receiver Propagation Delay Skew tDPHL, tDPLH tDPHL, tDPLH tDSKEW tDZH, tRZL tDLZ, tDHZ tRPLH, tRPHL tRSKEW RDIFF = 54, CL = 50pF, Figures 3, 5 RDIFF = 54, CL = 50pF, Figures 3, 5 RDIFF = 54, CL = 50pF, Figure 3, 5 RDIFF = 54, CL = 50pF, Figures 4, 6 RDIFF = 54, CL = 50pF, Figure 4, 6 CL = 15pF, Figures 7, 9 CL = 50pF, Figures 7, 9 25 400 200 80 200 200 400 400 800 800 200 800 400 150 10 ns ns ns ns ns ns ns
4
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, C1-C4 = 0.1F when tested at +3.3V 10%; C1 = 0.047F and C2, C3, C4 = 0.33F when tested at +5V10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Receiver Output Enable Time Receiver Output Disable Time SYMBOL tRZL, tRZH tRLZ, tRHZ tDPHL, tDPLH tDR, tDF tDSKEW tDZL tDLZ, tDHZ tRPLH, tRPHL tRSKEW tRZL, tRZH tRLZ, tRHZ CONDITIONS CL = 50pF, Figures 2, 8 CL = 50pF, Figures 2, 8 MIN TYP 100 100 MAX UNITS ns ns
MAX3160/MAX3161/MAX3162
RS-485/RS-422 TIMING CHARACTERISTICS (FAST = VCC, 10Mbps) Driver Propagation Delay Driver Rise And Fall Times Driver Propagation Delay Skew Driver Output Enable Time Driver Output Disable Time Receiver Propagation Delay Receiver Propagation Delay Skew Receiver Output Enable Time Receiver Output Disable Time RDIFF = 54, CL = 50pF, Figures 3, 5 RDIFF = 54, CL = 50pF, Figures 3, 5 RDIFF = 54, CL = 50pF, Figures 3, 5 RDIFF = 54, CL = 50pF, Figures 4, 6 RDIFF = 54, CL = 50pF, Figures 4, 6 CL = 15pF, Figures 7, 9 CL = 50pF, Figures 7, 9 CL = 50pF, Figures 2, 8 CL = 15pF, Figures 2, 8 100 100 400 200 80 60 10 120 25 10 800 400 150 10 ns ns ns ns ns ns ns ns ns
Note 2: Applies to A, B for MAX3162 and MAX3160/MAX3161 with HDPLX = GND, or Y, Z for MAX3160/MAX3161 with HDPLX = VCC.
Typical Operating Characteristics
(VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all RS-232 transmitters (RS-232 mode) loaded with 3k to ground, TA = +25C, unless otherwise noted.)
RS-232 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (FAST = GND)
MAX3160/2 TOC1
RS-232 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (FAST = VCC)
MAX3160/2 TOC2
RS-232 TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE (FAST = GND)
16 14 SLEW RATE (V/s) 12 10 8 6 4 2 0
MAX3160/2 TOC3
10.0 TRANSMITTER OUTPUT VOLTAGE (V) 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 0 1000 2000 3000 4000
10.0 TRANSMITTER OUTPUT VOLTAGE (V) 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 0 500 1000 1500
18
-10.0 5000 LOAD CAPACITANCE (pF)
-10.0 2000 LOAD CAPACITANCE (pF)
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
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5
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all RS-232 transmitters (RS-232 mode) loaded with 3k to ground, TA = +25C, unless otherwise noted.) MAX3160/MAX3161 OPERATING SUPPLY CURRENT vs. RS-232 TRANSMITTER SLEW RATE NO-LOAD SUPPLY CURRENT vs. LOAD CAPACITANCE WHEN vs. LOAD CAPACITANCE (FAST = VCC) TEMPERATURE TRANSMITTING DATA (RS-232 MODE)
MAX3160/2 TOC4
90 80 SLEW RATE (V/s) 70 60 50 40 30 20 10 0 0 500 1000 1500
50 SUPPLY CURRENT (mA) 1Mbps 40 250kbps 30 20 20kbps 10 0
MAX3160/2 TOC5
2.5 SUPPLY CURRENT (mA) RS-485 MODE 2.0
1.5 RS-232 MODE 1.0
0 0 1000 2000 3000 4000 5000 -40 -15 10 35 60 85 LOAD CAPACITANCE (pF) TEMPERATURE (C)
2000
LOAD CAPACITANCE (pF)
SHUTDOWN CURRENT vs. TEMPERATURE
MAX3160/2 TOC7
RS-485/422 OUTPUT CURRENT vs. DRIVER OUTPUT VOLTAGE
MAX3160/2 TOC8
RS-485/422 OUTPUT CURRENT vs. DRIVER OUTPUT HIGH VOLTAGE
160 OUTPUT CURRENT (mA) 140 120 100 80 60 40
MAX3160/2 TOC9
160 140 SHUTDOWN CURRENT (nA) 120 100 80 60 40 20 0 -40 -15 10 35 60
140 120 OUTPUT CURRENT (mA) 100 80 60 40 20 0
180
20 0 0 2 4 6 8 10 12 -7 -5 -3 -1 1 3 5 OUTPUT LOW VOLTAGE (V) OUTPUT HIGH VOLTAGE (V)
85
TEMPERATURE (C)
RS-485/422 DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX3160/2 TOC10
RS-485/422 DRIVER DIFFERENTIAL OUTPUT vs. TEMPERATURE
MAX3160/2 TOC11
OUTPUT CURRENT vs. RECEIVER OUTPUT LOW VOLTAGE
MAX3160/2 TOC12
100
3.5 3.4 3.3 OUTPUT VOLTAGE (V) 3.2 3.1 3.0 2.9 2.8 2.7 2.6 R = 50
30 25 OUTPUT CURRENT (mA) 20 15 10 5 0
10 OUTPUT CURRENT (mA)
1
0.1
0.01
0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 OUTPUT VOLTAGE (V)
2.5 -40 -15 10 35 60 85 TEMPERATURE (C)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT LOW VOLTAGE (V)
6
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MAX3160/2 TOC6
100
60
3.0
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all RS-232 transmitters (RS-232 mode) loaded with 3k to ground, TA = +25C, unless otherwise noted.)
OUTPUT CURRENT vs. RECEIVER OUTPUT HIGH VOLTAGE
MAX3160/2 TOC13
RS-485/422 RECEIVER PROPAGATION DELAY vs. TEMPERATURE
MAX3160/2 TOC16
RS-485/422 DRIVER PROPAGATION DELAY vs.TEMPERATURE (FAST)
R = 50
MAX3160/2 TOC18
14 12 OUTPUT CURRENT (mA) 10 8 6 4 2 0 0 0.5 1.0 1.5 2.0 2.5 3.0
120 100 PROPAGATION DELAY (ns) 80 60 40 20 0
CL = 50pF RISING FALLING
85 80 SUPPLY CURRENT (mA) 75 70 65 60 55 50
3.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
OUTPUT HIGH VOLTAGE (V)
TEMPERATURE (C)
TEMPERATURE (C)
RS-485/422 DRIVER PROPAGATION DELAY vs. TEMPERATURE (SLOW)
480 460 440 TIME (ns) 420 400 380 360 340 320 300 -40 -15 10 35 60 85 R = 50
MAX3160/2 TOC19
RS-485/422 DRIVER PROPAGATION (FAST, 10Mbps)
MAX3160/2 TOC20
RS-485/422 DRIVER PROPAGATION (SLOW, 250kbps)
MAX3160/2 TOC21
500
DI 5V/div
DI 5V/div
VY-VZ 2V/div
VY-VZ 2V/div
20ns/div
1.0s/div
TEMPERATURE (C)
I-V OUTPUT IMPEDANCE CURVE IN RS-232 SHUTDOWN MODE
MAX3160-A
RS-485/422 RECEIVER PROPAGATION (FAST, 5Mbps)
MAX3160/2 TOC22
RS-485/422 DRIVER DISABLE/ENABLE TO DRIVER OUTPUT
MAX3160/2 TOC24
400 200 0 CURRENT (A) -200 -400 -600 -800 -1000 -20 -15 -10 -5 0 VOLTS (V) 5 10 15
VY-VZ 2V/div R = 50 CL = 82pF
DE485 2V/div
CL = 50pF
RO 2V/div
VY - VZ 2V/div
20
40ns/div
100ns/div
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Pin Description
PIN MAX3160 1 2 3 4 -- 5 -- -- MAX3161 1 2 3 4 5 -- -- 6 MAX3162 1 2 3 4 5 -- 6 -- NAME C1+ VCC C1GND T1OUT Z(B)/T1OUT Z Z(B) FUNCTION Positive Terminal of the Positive Flying Capacitor Positive Supply Voltage Negative Terminal of the Positive Flying Capacitor Ground 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 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) 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 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) RS-232 Receiver Output RS-232 Driver Output RS-485/422 Receiver Output/RS-232 Receiver Output Active-Low Shutdown-Control Input. Drive low to shut down transmitters and charge pump. RS-232 Driver Output Select slew rate limiting for both RS-232 and RS485/422. 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. 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.
6 -- -- 7 -- 8 9 -- 10 -- 11
-- -- 7 9 8 10 11 -- 12 -- 13
-- 7 -- 9 8 -- 13 10 14 11 --
Y(A)/T2OUT Y Y(A) R1OUT T2OUT RO/R2OUT SHDN R2OUT FAST RO RS485/RS232
--
--
12
RE485
12
14
--
HDPLX
8
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
Pin Description (continued)
PIN MAX3160 13 14 -- -- 15 -- -- 16 -- 17 -- 18 19 20 -- -- -- -- MAX3161 -- -- -- 15 19 -- 16 20 17 21 18 22 23 24 -- -- -- -- MAX3162 -- -- 15 17 -- 16 18 -- 19 25 20 26 27 28 21 22 23 24 NAME A/R2IN B/R1IN RE232 A DE485/T2IN TE232 B DI/T1IN R2IN VR1IN C2C2+ V+ T2IN DE485 DI T1IN FUNCTION Noninverting RS-485/422 Receiver Input/RS-232 Receiver Input Inverting RS-485/422 Receiver Input/RS-232 Receiver Input RS-232 Receiver Enable. Logic-level low enables RS232 receivers. 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 Negative Charge-Pump Rail RS-232 Receiver Input Negative Terminal of the Negative Flying Capacitor Positive Terminal of the Negative Flying Capacitor Positive Charge-Pump Rail RS-232 Driver Input RS-485/RS-422 Driver Enable RS-485/RS-422 Driver Input RS-232 Driver Input
MAX3160/MAX3161/MAX3162
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Functional Diagrams
MAX3160
RS-232 MODE VCC 1 C1 2 3 CBYPASS 4 5 6 7 8 9 SHDN 10 FAST GND T1 T2 R1 R2 V17 C4 RS-232 OUTPUTS 16 15 14 13 HDPLX 12 RS-485/RS-232 11 RS-232 INPUTS LOGIC INPUTS 5 RS-485 OUTPUTS 6 7 R0 LOGIC OUTPUT 8 9 SHDN 10 FAST R C1+ VCC C1CHARGE PUMP V+ C2+ C220 C3 19 C2 18 3 CBYPASS 4 C1 2 VCC 1 C1+ VCC C1GND Z
RS-485 MODE V+ C2+ CHARGE PUMP C2V20 19 C3 18 17 16 D Y DE B A 15 14 RS-485 INPUTS 13 12 RS-485/RS-232 11 HALF/FULL DUPLEX LOGIC INPUTS
C2
C4
LOGIC OUTPUTS
10
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
Functional Diagrams (continued)
MAX3161
MAX3160/MAX3161/MAX3162
RS-232 MODE VCC 1 C1 2 3 CBYPASS 4 RS-232 OUTPUT 5 6 7 RS-232 OUTPUT 8 9 LOGIC OUTPUTS 10 11 SHDN 12 FAST T2 R1 R2 GND T1 V21 C4 20 19 18 17 16 15 HDPLX 14 RS-485/RS-232 13 RS-232 INPUTS LOGIC INPUTS RS-485 OUTPUTS 7 8 9 R0 LOGIC OUTPUT 10 11 SHDN 12 FAST R 5 6 Z C1+ VCC C1CHARGE PUMP V+ C2+ C224 C3 23 C2 22 CBYPASS 4 3 C1 2 VCC 1 C1+ VCC C1GND
RS-485 MODE V+ C2+ CHARGE PUMP C2V24 C3 23 C2 22 21 20 LOGIC INPUTS 19 D Y DE 18 17 B A 16 RS-485 INPUTS 15 14 RS-485/RS-232 13 HALF/FULL DUPLEX
C4
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11
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Functional Diagrams (continued)
MAX3162
Y R
Test Circuits
VCC 1 C1 2 3 CBYPASS 4 RS-232 5 OUTPUT 6 RS-485 OUTPUTS 7 RS-232 8 OUTPUT
VOD
C1+ VCC C1GND T1 CHARGE PUMP
V+ C2+ C2V-
28 C3 27 C2 26 25 C4 24
Z
R
VOC
Figure 1. RS-485/422 Driver DC Test Load
Z Y D DE485 T2
23 LOGIC INPUTS 22 211
RECEIVER OUTPUT
TEST POINT CL 1k S1
1k VCC
R1 9 LOGIC OUTPUTS 10 11 RO 12 RE485 R A 17 16 DE485 14 FAST 15 DI Y VOD RDIFF Z 3V R2 B 20 RS-232 INPUTS 19 18 RS-485 INPUTS
S2
Figure 2. RS-485/422 Receiver Enable/Disable Timing Test Load
13 SHDN
TE232
CL
CL
Figure 3. RS-485/422 Driver Timing Test Circuit
12
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
Test Circuits (continued)
3V DI 0 S1 VCC Z VO Y CL S2 VDIFF VO 0 -VO 1/2 VO 10% TDR 90% VDIFF = Vy - Vz 90% TDF tDSKEW = | tDPLH - tDPHL | 10% 1.5V tDPLH tDPHL 1.5V 1/2 VO
MAX3160/MAX3161/MAX3162
OUTPUT UNDER TEST
500
Figure 4. RS-485/422 Driver Enable/Disable Timing Test Load
Figure 5. RS-485/422 Driver Propagation Delays
3V DE485 0
1.5V
1.5V VOH VOL A B VCC/2 tRPHL INPUT OUTPUT tRPLH VCC/2
tDZL Y, Z VOL Y, Z 2.3V 0 tDZH
tDLZ VOL +0.5V
RO
2.3V OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH
1V -1V VOH -0.5V tDHZ
Figure 6. RS-485/422 Driver Enable and Disable Times
Figure 7. RS-485/422 Receiver Propagation Delays
3V RE485 0
1.5V
1.5V B VOL + 0.5V VID A VOH - 0.5V tRHZ R RO
tRZL VCC RO
tRLZ
1.5V OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH
CL
RO 0
1.5V tRZH
Figure 8. MAX3162 RS-485/422 Receiver Enable and Disable Times
Figure 9. RS-485/422 Receiver Propagation Delays Test Circuit
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13
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Detailed Description
The MAX3160/MAX3161/MAX3162 3V/5V, multiprotocol transceivers can be pin configured in a number of RS232 and RS-485/422 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 programmable, allowing reduced EMI data rates, or up to 10Mbps RS-485 communications. Power consumption can be reduced to 1A 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 the commercial and extended temperature ranges) facilitate board layout.
MAX3161 The MAX3161 is a 2TX/2RX RS-232 transceiver in RS232 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 5k 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 drivers, receivers, and transmitters can be enabled or disabled by pin configuration. All outputs are high-Z when not activated. RS-232 receiver inputs are 5k 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 primary difference between the devices is the multiplexing of the I/O pins. The MAX3160 has common transmitter outputs and receiver inputs for its RS-232 and RS-485/422 transceivers, and common digital I/O pins. The MAX3160 is optimized for multiprotocol operation on a single interface 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 transceivers, 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. The MAX3162 has separate transmitter outputs and receiver inputs for its RS-232 and RS-485/422 transceivers, and separate digital I/O pins. The MAX3162 is optimized for protocol translation between two interface buses and comes in a 28-pin SSOP. See Tables 1-12, Functional Diagrams, and the following descriptions for details on each device.
FAST Mode operation
The FAST control pin is used to select the slew-rate limiting of the RS-232 transmitters and the RS-485/422 drivers. 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 RS485/422 data rates up to 10Mbps are possible when FAST is asserted. FAST can be changed during operation without interrupting data communications.
Half-Duplex RS-485/422 Operation
Asserting HDPLX places the MAX3160/MAX3161 in half-duplex mode. The RS-485 receiver inputs are internally 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.
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 supply current is reduced to 1A. The RS-232 receiver outputs remain active if in RS-232 mode. The chargepump capacitors must be recharged when coming out of shutdown before resuming operation in either RS-232 or RS-485/422 mode (Figure 10).
MAX3160 The MAX3160 is a 2TX/2RX RS-232 transceiver in RS232 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 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 5k for RS-232 operation.
14
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 voltages (VCC) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode: if the magnitude of either output voltage is less than 5.5V, the
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
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 Functional Diagrams). The receivers convert RS-232 signals to CMOS-logic output 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 5k resistors, forcing the outputs to a logic high. The MAX3162 has transmitter and receiver enable pins that allow its outputs to be threestated.
MAX3160/MAX3161/MAX3162
RS-485/422 Transceivers
The MAX3160/MAX3161/MAX3162 RS-485/422 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 Fail-Safe). The MAX3160/MAX3161/MAX3162 also feature pin-selectable reduced slew-rate drivers that minimize 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 communication 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 0.1F 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 usually rises at low temperatures, influences the amount of ripple on V+ and V-.
Fail-Safe
The MAX3160/MAX3161/MAX3162 guarantee a logichigh 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 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 complies with the 200mV EIA/TIA-485 standard.
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.
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 transmitters are guaranteed at a 250kbps data rate in slewrate limited mode (FAST = GND) with worst-case loads of 3k 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 or VCC.
RS-232 Transmitter Outputs when Exiting Shutdown
Figure 10 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 3k 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.
15
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Truth Tables
RS-232 Transmitters RS-232 Receivers
Table 4. MAX3160 Table 1. MAX3160
INPUTS SHDN 0 1 1 1 RS485 RS232 X 0 0 1 DI/T1IN, DE485/T2IN X 0 1 X OUTPUTS Z(B)/T1OUT, Y(A)/T2OUT 1/8 Unit Load 1 0 RS-485 Mode X 1 X SHDN X X X INPUTS RS-485/ RS-232 0 0 0 B/R1IN, A/R2IN 0 1 Inputs Open OUTPUTS R1OUT, RO/R2OUT 1 0 1 R1OUT High-Z, RO/R2OUT in RS-485 mode
Table 5. MAX3161 Table 2. MAX3161
INPUTS SHDN 0 1 1 1 RS-485/ RS-232 X 0 0 1 DI/T1IN, DE485/T2IN X 0 1 X OUTPUTS T1OUT, T2OUT High-Z 1 0 High-Z X 1 X SHDN X X X INPUTS RS-485/ RS-232 0 0 0 R1IN, R2IN 0 1 Inputs Open OUTPUTS R1OUT, RO/R2OUT 1 0 1 R1OUT High-Z, RO/R2OUT in RS-485 mode
Table 3. MAX3162
INPUTS SHDN 0 X 1 1 TE232 X 0 1 1 T1IN,T2IN X X 0 1 OUTPUTS T1OUT, T2OUT High-Z High-Z 1 0
Table 6. MAX3162
INPUTS SHDN X X X X RE232 1 0 0 0 R1IN, R2IN X 0 1 Inputs open OUTPUTS R1OUT, R2OUT High-Z 1 0 1
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 loopback 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
16
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.
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12k (one-unit load), and the standard driver can drive up to 32-unit loads. The MAX3160 has a 1/4-unit load receiver input impedance (48k), allowing up to 128 trans-
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
Truth Tables (continued)
RS-485/422 Drivers
MAX3160/MAX3161/MAX3162
Table 7. MAX3160
INPUTS SHDN 0 1 1 1 X R RS485/R S 2 3 2 1 1 1 1 0 DE485/T2IN X 0 1 1 X DI/T1IN X X 0 1 X Z(B)/T1OUT 1/8 Unit Load 1/8 Unit Load 1 0 RS-232 Mode OUTPUTS Y(A)/T2OUT 1/8 Unit Load 1/8 Unit Load 0 1
Table 8. MAX3161
INPUTS SHDN 0 X X 1 1 R RS485/R S 2 3 2 X 0 X 1 1 DE485/T2IN X X 0 1 1 DI/T1IN X X X 0 1 Z(B) 1/8 Unit Load 1/8 Unit Load 1/8 Unit Load 1 0 OUTPUTS Y(A) 1/8 Unit Load 1/8 Unit Load 1/8 Unit Load 0 1
Table 9. MAX3162
INPUTS SHDN 0 X 1 1 DE485 X 0 1 1 DI X X 0 1 Z High-Z High-Z 1 0 OUTPUTS Y High-Z High-Z 0 1
RS-485/422 Receivers
Table 10. MAX3160
INPUTS RS485/RS232 1 1 1 1 1 1 1 0 SHDN 0 1 1 1 1 1 1 X HDPLX X 0 0 0 1 1 1 X A - B* X -50mV -200mV Floating X X X X Y - Z* X X X X -50mV -200mV Floating X OUTPUT RO/R2OUT High-Z Up to VCC 1 0 1 1 0 1 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, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Truth Tables (continued)
Table 11. MAX3161
INPUTS RS485/RS232 1 1 1 1 1 1 1 0 SHDN 0 1 1 1 1 1 1 X HDPLX X 0 0 0 1 1 1 X A-B X -50mV -200mV Floating X X X X Y(A) - Z(B) X X X X -50mV -200mV Floating X OUTPUT RO/R2OUT High-Z up to VCC 1 0 1 1 0 1 RS-232 Mode
Table 12. MAX3162
INPUTS SHDN 0 X 1 1 1 RE485 X 1 0 0 0 A-B X X -50mV -200mV Inputs Open OUTPUT RO High-Z High-Z 1 0 1
Table 13. Required Minimum Capacitance Values
SUPPLY VOLTAGE (V) +3.0 TO +3.6 +4.5 TO +5.5 +3.0 TO +5.5 C1 (F) 0.1 0.047 0.1 C2, C3, C4, CBYPASS (F) 0.1 0.33 0.47
ceivers to be connected in parallel on one communication line. The MAX3161/MAX3162 have a 1/8-unit load receiver input impedance (96k), 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. The MAX3160/MAX3161/MAX3162 RS-485 driver outputs are 1/8-unit load when disabled This impedance may be reduced if the D1 pin is toggled at a high frequency. With no power applied (VCC = GND), the RS485 transmitter output impedances typically go to 1/2unit load on the MAX3161/MAX3162, and to one-unit load on the MAX3160.
Typical Operating Characteristics). The second, a thermal 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.
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 terminated 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 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
18
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
MAX 3160-2 FIG10 MAX 3160-2 FIG12
SHDN 5V/division TIN T1OUT 2V/div GND
TOUT 5V/div
T2OUT 2V/div ROUT 40s/div
1s/div
Figure 10. MAX3160 RS-232 Transmitter Outputs When Exiting Shutdown
VCC CBYPASS
Figure 12. RS-232 Loopback Test Result at 250kbps, FAST = Low
MAX 3160-2 FIG13
TIN VCC C1+ C1 C1C2+ C2 C2V+ C3 5V/div VC4 ROUT T_ OUT TOUT
MAX3160 MAX3161 MAX3162
T_ IN
200ns/div
R_ OUT
R_ IN
Figure 13. RS-232 Loopback Test Result at 1000kbps, FAST = High
1000pF
5k VCC SHDN 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.
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 transmitted as an RS-232 signal on T1OUT.
Multiprotocol Bus
The Typical Operating Circuit shows a standard application for the MAX3160. The MAX3160's output pins are multiplexed between RS-232 and RS-485 protocols by a microprocessor (P). The P also directs the shutdown functions, enable lines, and the duplex of the MAX3160. Data is transmitted to the MAX3100 UART through an SPITM port. The UART asynchronously
RS-232/RS-485 Protocol Translator
Figure 15 shows the MAX3162 configured as an RS232/RS-485 protocol translator. The direction of translation is controlled through the RTS signal (R1IN). The
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19
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
3.3V MAX3160 MAX3161 MAX3162 A RO R RE485 B DATA IN 27 C2 100nF 120 DATA OUT RCV C2+ 2 VCC C1+ C11 3 C1 100nF 120
CBYPASS 100nF
DE485 Z D Y
26 13 5 10 23
C2- MAX3162 SHDN T1OUT R2OUT DI R2IN R1IN RE232 TE232 FAST V+ GND 4
DI
T1IN
24
NOTE: RE485 ON MAX3162 ONLY
TX RTS
19 20 15 16 14
11 RO 9 R1OUT 12 RE485 22 DE485 A B Z Y V17 18 6 7 25 C4 100nF
Figure 14. RS-485 Line Repeater
transfers data through the MAX3160 to the pin-selected RS-232 or RS-485 protocal; see Table 14 for commonly used cable connections.
28 C3 100nF
Multiprotocol Bus Multiplexer
The Typical Application Circuit shows the MAX3161 configured 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 P to monitor a point-to-point RS-232 bus, and a multidrop RS-485 interface. The MAX3100 UART asynchronously 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.
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Table 14. Cable Connections Commonly Used for EIA/TIA-232 and V.24 Asynchronous Interfaces
EIA/TIA-232 STANDARD CONNECTOR PIN MAX3160 MAX3161 MAX3162 EQUIVALENT R2IN T1OUT GND PIN NUMBER MAX3160 13 5 4 MAX3161 17 5 4 MAX3162 Data Carrier Detect 19 5 4 Received Data Transmitted Data Data Terminal Ready Signal Ground Data Set Ready T2OUT R1IN 6 14 8 18 8 20 Request to Send (= DTE ready) Clear to Send (= DCE ready) Ring Indicator FUNCTION (as seen by DTE)
DCD RD TD DTR SG DSR RTS CTS RI
1 2 3 4 5 6 7 8 9
Typical Application Circuit
+
2 VCC TX 13 MAX3100 UART RX 12 RTS 11 CTS 10 R1OUT 9 DI/T1IN 20 RO/R2OUT 10 DE/T2IN 19 MAX3161 14 HDPLX T1OUT 5 R2IN 17 T2OUT 8 R1IN 18 RS-232
DB9
1
Y(A) 7 Z(B) 6 RS-485 RJ45
SPI GND 4 FAST 12 SHDN
P
RS-485/RS-232
SHDN
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21
+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162
Pin Configurations
TOP VIEW +
C1+ 1 VCC 2 C1- 3 GND 4 Z(B)/T1OUT 5 Y(A)/T2OUT 6 R1OUT 7 RO/R2OUT 8 SHDN 9 FAST 10 20 V+ 19 C2+ 18 C217 VC1+ 1 VCC 2 C1- 3 GND 4 T1OUT 5 Z(B) 6 Y(A) 7 T2OUT 8 R1OUT 9 RO/R2OUT 10 SHDN 11
+
24 V+ 23 C2+ 22 C221 VC1+ 1 VCC 2 C1- 3 GND 4 T1OUT 5 Z6 Y7 T2OUT 8 R1OUT 9 R2OUT 10 RO 11 RE485 12 SHDN 13 FAST 14
+
28 V+ 27 C2+ 26 C225 V24 T1IN
MAX3160
16 DI/T1IN 15 DE485/T2IN 14 B/R1IN 13 A/R2IN 12 HDPLX 11 RS-485/RS-232
MAX3161
20 DI/T1IN 19 DE485/T2IN 18 R1IN 17 R2IN 16 B 15 A 14 HDPLX 13 RS-485/RS-232
MAX3162
23 DI 22 DE485 21 T2IN 20 R1IN 19 R2IN 18 B 17 A 16 TE232 15 RE232
20-PIN SSOP
FAST 12
24-PIN SSOP
28-PIN SSOP
Selector Guide
PART MAX3160 MAX3161 MAX3162 DUAL-MODE No No Yes FLOWTHROUGH PIN-OUT Yes No Yes RS-485 INPUT UNIT LOADS 1/4 1/8 1/8
Chip Information
PROCESS: BiCMOS
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. PACKAGE TYPE 20 SSOP 24 SSOP 28 SSOP PACKAGE CODE A20+1 A24+3 A28+3 DOCUMENT NO. 21-0056 21-0056 21-0056
22
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+3.0V to+5.5V, 1A, RS-232/RS-485/422 Multiprotocol Transceivers
Revision History
REVISION NUMBER REVISION DATE DESCRIPTION Corrected the "Continuous Power Dissipation" specifications under the Absolute Maximum Ratings. 2 12/09 Changed pin labels in the Functional Diagrams. Deleted "TRANSISTOR COUNT: 1580" and added "PROCESS: BiCMOS" to the Chip Information. PAGES CHANGED 2 11 22
MAX3160/MAX3161/MAX3162
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
(c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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