19-3580; Rev 0; 2/05 ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers Features The MAX3160E/MAX3161E/MAX3162E are programmable RS-232/RS-485/RS-422 multiprotocol transceivers. The MAX3160E/MAX3161E are pin programmable as a 2Tx/2Rx RS-232 interface or a single RS-485/RS-422 transceiver. The MAX3162E is configured as a 2Tx/2Rx RS-232 interface, and a single RS-485/RS-422 transceiver simultaneously. ♦ Single Supply Operation from +3V to +5.5V ♦ ESD Protection ±15kV Human Body Model ♦ Pin-Selectable as 2Tx/2Rx RS-232 or Single RS-485/RS-422 (MAX3160E/MAX3161E) ♦ 2Tx/2Rx RS-232 and Single RS-485/RS-422 (MAX3162E) ♦ Pin-Selectable RS-232/RS-485 Transmitter Slew Rates Reduce EMI ♦ 10Mbps RS-485 and 1Mbps RS-232 Data Rates ♦ Pin-Selectable Half-Duplex or Full-Duplex RS-485/RS-422 Operation (MAX3160E/MAX3161E) ♦ RS-485/RS-422 True Fail-Safe Receivers ♦ 10nA Shutdown Supply Current ♦ 1/8-Unit Load Allows up to 256 Transceivers on the Bus The MAX3160E/MAX3161E/MAX3162E feature enhanced electrostatic discharge (ESD) protection. All of the transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model. All devices incorporate a proprietary low-dropout transmitter output stage, and an on-board dual charge pump to allow RS-232- and RS-485-/RS-422-compliant performance from a +3V to +5.5V supply. 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 RS-232 and RS-485/RS-422 modes. Slewrate limiting minimizes EMI and reduces reflections caused by improperly terminated cables, allowing errorfree data transmission up to 250kbps. Disabling slew-rate limiting allows these devices to transmit at data rates up to 10Mbps in RS-485/RS-422 mode and up to 1Mbps in RS-232 mode. The MAX3160E/MAX3161E/MAX3162E feature a 10nA shutdown mode, short-circuit limiting, and thermal shutdown circuitry to protect against excessive power dissipation. The MAX3160E/MAX3162E offer a flow-through pinout that facilitates board layout. The MAX3160E/ MAX3161E/MAX3162E are available in tiny SSOP packages and operate over the commercial and extended temperature ranges. Ordering Information PART MAX3160ECAP TEMP RANGE 0°C to +70°C PINPACKAGE 20 SSOP MAX3160EEAP -40°C to +85°C 20 SSOP A20-2 MAX3161ECAG 0°C to +70°C 24 SSOP A24-3 MAX3161EEAG -40°C to +85°C 24 SSOP A24-3 MAX3162ECAI 0°C to +70°C 28 SSOP A28-1 MAX3162EEAI -40°C to +85°C 28 SSOP A28-1 Typical Operating Circuit +3V TO +5.5V 2 ________________________Applications Point-of-Sales Equipment VCC RS-485/RS232 Peripherals Industrial Controls Networking RS-232 to RS-485 Interface Converters Security Systems PACKAGE CODE A20-2 11 MAX3160E TX 13 RTS MAX3100 11 RX DI/T1IN 15 12 8 10 7 CTS Z(B)/T1OUT 16 DE485/T2IN Y(A)/T2OUT RO/R2OUT A/R2IN R1OUT B/R1IN 5 6 DB9 13 14 GND FAST HDPLX SHDN SPI µP 4 10 12 9 RJ45 SHDN 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. MAX3160E/MAX3161E/MAX3162E General Description MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers ABSOLUTE MAXIMUM RATINGS Output Short-Circuit Duration T1OUT, T2OUT, Y, Z ..............................................Continuous Continuous Power Dissipation (TA = +70°C) 20-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW 24-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW 28-Pin SSOP (derate 9.1mW/°C above +70°C) ...........727mW Operating Temperature Ranges MAX316_CA_ ......................................................0°C to +70°C MAX316_EA_ ...................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C VCC to GND. .............................................................-0.3V to +6V V+ to GND ................................................................-0.3V to +7V V- to GND. ................................................................-7V to +0.3V V+ - V- (Note 1)....................................................................+13V Input Voltages T1IN, T2IN, DI, DE485, RE485, TE232, RE232, SHDN, FAST, HDPLX, RS485/RS232 to GND. .................-0.3V to +6V A, B, R1IN, R2IN to GND .................................................±25V Output Voltages T1OUT, T2OUT, Y, Z to GND (VCC = 0 or SHDN = GND) ..............................................................±13.2V T1OUT, T2OUT to GND (VCC = 5.5V and SHDN = VCC) .....................................................-13.2V to +9V R2OUT, R1OUT, RO to GND..................-0.3V to (VCC + 0.3V) Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2) PARAMETER DC CHARACTERISTICS VCC Standby Current SYMBOL ICC CONDITIONS MIN TYP MAX MAX3160E/MAX3161E, no load, RS-485/ RS-232 = GND 1.2 2.8 MAX3160E/MAX3161E, no load, RS-485/ RS-232 = VCC 2.5 5.5 3 6 0.01 1 MAX3162E, no load VCC Shutdown Current ISHDN SHDN = GND, receiver inputs open or grounded UNITS mA µA TRANSMITTER AND LOGIC INPUTS (DI, T1IN, T2IN, DE485, RE 4 85 , TE232, R E 2 3 2 , FAST, HDPLX, SHDN, RS-485/ R S - 232 ) Logic-Input Low Logic-Input High VIL VIH 0.8 VCC = +3.3V 2.0 VCC = +5V 2.4 V V Logic-Input Leakage Current IINL ±0.01 Transmitter Logic Hysteresis VHYS 0.5 ±1 µA V RS-232 AND RS-485/RS-422 RECEIVER OUTPUTS (R1OUT, R2OUT, RO) Receiver Output-Voltage Low VOL IOUT = 2.5mA Receiver Output-Voltage High VOH IOUT = -1.5mA Receiver Output Short-Circuit Current IOSR 0 ≤ VO ≤ VCC Receiver Output Leakage Current IOZR Receivers disabled 2 0.4 VCC - 0.6 V V ±20 ±85 mA ±0.05 ±1 µA _______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers (VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2) PARAMETER SYMBOL RS-232 RECEIVER INPUTS (R1IN, R2IN) CONDITIONS MIN Input Voltage Range TYP -25 Logic-Input Low MAX UNITS +25 V 0.8 Logic-input High VCC = +3.3V 2.0 VCC = +5V 2.4 Input Hysteresis V 0.5 Input Resistance V VCC = +3.0V to 5.5V 3 5 7 VCC = 0 6 11 16 kΩ RS-485/RS-422 RECEIVER INPUTS (Note 3) Input Resistance RIN -7V < VCM < +12V MAX3160E Input Current IIN MAX3161E/MAX3162E Input Differential Threshold VTH MAX3160E 48 MAX3161E/ MAX3162E 96 VCM = +12V 0.25 VCM = -7V -0.15 VCM = +12V 0.125 VCM = -7V -7V ≤ VCM ≤ +12V -0.075 -50 -200 ∆VTH Input Hysteresis kΩ mA mV 30 mV RS-232 TRANSMITTER OUTPUTS (T1OUT, T2OUT) Output Voltage Swing Both transmitter outputs loaded with 3kΩ to GND ±5 ±5.4 V Output Resistance VCC = V+ = V- = 0, T_OUT = ±2V 300 10M Ω Output Short-Circuit Current Output Leakage Current ISC IO ±30 T_OUT = GND VOUT = ±9V TE232 = GND or SHDN = GND ±60 mA ±125 MAX3160E MAX3161E ±25 MAX3162E ±25 µA RS-485/RS-422 TRANSMITTER OUTPUTS (Y, Z) Differential Output Voltage VOD R = 27Ω (RS-485) 1.5 R = 50Ω (RS-422) 2 V Figure 1 Change in Magnitude of Differential Output Voltage for Complementary Output States |∆VOD| R = 27Ω or 50Ω, Figure 1 0.2 V Common-Mode Output Voltage VOC R = 27Ω or 50Ω, Figure 1 3 V Change in Magnitude of Common-Mode Output Voltage for Complementary Output States |∆VOC| R = 27Ω or 50Ω, Figure 1 0.2 V _______________________________________________________________________________________ 3 MAX3160E/MAX3161E/MAX3162E ELECTRICAL CHARACTERISTICS (continued) MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers ELECTRICAL CHARACTERISTICS (continued) (VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2) PARAMETER Output Short-Circuit Current Output Leakage Current SYMBOL ISC IO CONDITIONS VY or VZ = -7V to +12V VY or VZ = -7V or +12V, DE485 = GND or SHDN = GND MIN TYP MAX ±250 MAX3160E ±125 MAX3161E ±25 MAX3162E ±25 UNITS mA µA RS-232 TRANSMITTER TIMING CHARACTERISTICS (SLOW MODE, FAST = GND, 250kbps, one transmitter switching) Maximum Data Rate Transmitter Skew RL = 3kΩ, CL = 1000pF tTSKEW RL = 3kΩ, CL = 150pF, Figure 6 VCC = +3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, measured from +3.0V to -3.0V or -3.0V to +3.0V Transition-Region Slew Rate 250 kbps 25 ns CL = 150pF to 1000pF 6 30 CL = 150pF to 2500pF 4 30 V/µs RS-232 TRANSMITTER TIMING CHARACTERISTICS (FAST MODE, FAST = VCC, 1Mbps, one transmitter switching) Maximum Data Rate Transmitter Skew tTSKEW VCC = +3V to +4.5V, RL = 3kΩ, CL = 250pF 1 VCC = +4.5V to +5.5V, RL = 3kΩ, CL = 1000pF 1 RL = 3kΩ, CL = 150pF, Figure 6 VCC = +3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, measured from +3.0V to -3.0V or -3.0V to +3.0V Transition-Region Slew Rate Mbps 10 ns MAX3160E 13 150 MAX3161E MAX3162E 24 150 V/µs RS-232 RECEIVER TIMING CHARACTERISTICS Receiver Propagation Delay tPHL,tPLH R_IN to R_OUT, CL = 15pF, Figure 5 0.15 µs Receiver Output Enable Time tRZL,tRZH CL = 50pF, Figures 2, 10, MAX3162E 200 ns Receiver Output Disable Time tRLZ,tRHZ CL = 15pF, Figures 2, 10, MAX3162E 200 ns CL = 50pF, Figure 5 100 ns Receiver Skew tRSKEW RS-485/RS-422 DRIVER TIMING CHARACTERISTICS (SLOW MODE, FAST = GND, 250kbps) 4 Differential Driver Propagation Delay tDPHL, tDPLH RDIFF = 54Ω, CL = 50pF, Figures 3, 7 200 400 800 ns Differential Driver Rise and Fall Time tDR, tDF RDIFF = 54Ω, CL = 50pF, Figures 3, 7 200 400 800 ns Differential Driver Propagation Delay Skew tDSKEW RDIFF = 54Ω, CL = 50pF, Figures 3, 7 200 ns Driver Output Enable Time tDZH, tDZL CL = 50pF, Figures 4, 8 400 900 ns Driver Output Disable Time tDLZ, tDHZ CL = 50pF, Figures 4, 8 200 400 ns _______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers (VCC = +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS RS-485/RS-422 DRIVER TIMING CHARACTERISTICS FAST MODE, FAST = VCC, 10Mbps) MIN TYP MAX UNITS Differential Driver Propagation Delay tDPHL, tDPLH RDIFF = 54Ω, CL = 50pF, Figures 3, 7 60 120 ns Differential Driver Rise and Fall Times tDR, tDF RDIFF = 54Ω, CL = 50pF, Figures 3, 7 10 25 ns Differential Driver Propagation Delay Skew tDSKEW RDIFF = 54Ω, CL = 50pF, Figures 3, 7 10 ns Driver Output Enable Time tDZH,tDZL CL = 50pF, Figures 4, 8 400 900 ns Driver Output Disable Time tDHZ,tDLZ CL = 50pF, Figures 4, 8 200 400 ns RS-485/RS-422 RECEIVER TIMING CHARACTERISTICS Receiver Propagation Delay Receiver Propagation Delay Skew Receiver Output Enable Time Receiver Output Disable Time tRPLH, tRPHL CL = 15pF, Figures 9, 11 80 150 ns tRSKEW CL = 15pF, Figures 9, 11 1 10 ns tRZL, tRZH tRLZ, tRHZ MAX3162E, CL = 50pF, Figures 2, 10 MAX3162E, CL = 15pF, Figures 2, 10 100 100 ns ns ESD PROTECTION R_IN, T_OUT, A, B, Y, Z Human Body Model ±15 kV Note 2: All currents into the device are positive. All currents out of the device are negative. Note 3: Applies to A, B for MAX3162E and MAX3160E/MAX3161E with HDPLX = GND, or Y, Z for MAX3160E/MAX3161E with HDPLX = VCC. Typical Operating Characteristics (VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to ground, TA = +25°C, unless otherwise noted.) 2.50 0 -2.50 -5.00 -7.50 7.50 0 -2.50 0 1000 2000 3000 4000 LOAD CAPACITANCE (pF) 5000 RISING 14 12 FALLING 10 8 6 -5.00 4 -7.50 2 0 -10.00 -10.00 16 5.00 2.50 MAX3160E toc03 DATA RATE = 1Mbps SLEW RATE (V/µs) 5.00 18 MAX3160E toc02 7.50 10.00 TRANSMITTER OUTPUT VOLTAGE (V) MAX3160E toc01 TRANSMITTER OUTPUT VOLTAGE (V) 10.00 RS-232 TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE (FAST = GND) RS-232 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (FAST = VCC) RS-232 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (FAST = GND) 0 500 1000 1500 2000 LOAD CAPACITANCE (pF) 2500 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) _______________________________________________________________________________________ 5 MAX3160E/MAX3161E/MAX3162E ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to ground, TA = +25°C, unless otherwise noted.) MAX3160E/MAX3161E OPERATING SUPPLY CURRENT RS-232 TRANSMITTER SLEW RATE NO-LOAD SUPPLY CURRENT vs. LOAD CAPACITANCE WHEN vs. LOAD CAPACITANCE (FAST = VCC) vs. TEMPERATURE TRANSMITTING DATA (RS-232 MODE) 60 50 FALLING 40 30 40 DATA RATE = 250kbps 30 20 MAX3160E toc06 2.5 SUPPLY CURRENT (mA) 70 DATA RATE = 1Mbps 50 SUPPLY CURRENT (mA) SLEW RATE (V/µs) RISING 80 3.0 MAX3160E to05 100 90 60 MAX3160E toc04 110 RS-485 MODE 2.0 1.5 RS-232 MODE 1.0 DATA RATE = 20kbps 20 0.5 10 10 0 400 800 1200 1600 0 2000 1000 2000 3000 4000 -40 5000 -15 10 35 60 85 LOAD CAPACITANCE (pF) LOAD CAPACITANCE (pF) TEMPERATURE (°C) SHUTDOWN CURRENT vs. TEMPERATURE RS-485/RS-422 OUTPUT CURRENT vs. DRIVER-OUTPUT LOW VOLTAGE RS-485/RS-422 OUTPUT CURRENT vs. DRIVER-OUTPUT LOW VOLTAGE 150 100 100 80 60 40 MAX3160E toc09 120 OUTPUT CURRENT (mA) 120 OUTPUT CURRENT (mA) 200 140 MAX3160E toc08 140 MAX3160E toc07 250 SHUTDOWN CURRENT (nA) 0 0 0 100 80 60 40 50 20 20 0 -15 10 35 60 85 0 2 4 6 8 10 -7 12 -5 -3 -1 1 3 5 TEMPERATURE (°C) OUTPUT LOW VOLTAGE (V) OUTPUT LOW VOLTAGE (V) RS-485/RS-422 DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE RS-485/RS-422 DRIVER DIFFERENTIAL OUTPUT vs. TEMPERATURE RECEIVER OUTPUT CURRENT vs. RECEIVEROUTPUT LOW VOLTAGE 70 60 50 40 30 2.7 2.6 2.5 2.4 2.3 20 2.2 10 2.1 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT LOW VOLTAGE (V) 3.5 4.0 25 20 15 10 5 0 2.0 0 30 MAX3160E toc12 2.8 OUTPUT VOLTAGE (V) 80 RDIFF = 100Ω FIGURE 1 2.9 OUTPUT CURRENT (mA) 90 MAX3160E toc11 3.0 MAX3160E toc10 100 6 0 0 -40 OUTPUT CURRENT (mA) MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers -40 -15 10 35 TEMPERATURE (°C) 60 85 0 0.5 1.0 1.5 2.0 2.5 OUTPUT LOW VOLTAGE (V) _______________________________________________________________________________________ 3.0 3.5 ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers 10 8 6 4 80 FALLING 50 40 30 20 2 RISING 40 FALLING 35 30 25 10 20 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 -40 -15 10 35 60 -40 85 -15 10 35 60 85 OUTPUT-HIGH VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) RS-485/RS-422 DRIVER PROPAGATION DELAY vs. TEMPERATURE (FAST = GND) RS-485/RS-422 DRIVER PROPAGATION (FAST = VCC, 10Mbps) RS-485/RS-422 DRIVER PROPAGATION (FAST = GND, 250kbps) 350 MAX3160E toc16 400 PROPAGATION DELAY (ns) CL = 50pF RDIFF = 54Ω DATA RATE = 10Mbps 45 60 MAX3160E toc15 RISING 70 50 MAX3160E toc14 90 PROPAGATION DELAY (ns) OUTPUT CURRENT (mA) 12 100 PROPAGATION DELAY (ns) MAX3160E toc13 14 RS-485/RS-422 DRIVER PROPAGATION DELAY vs. TEMPERATURE (FAST = VCC) RS-485/RS-422 RECEIVER PROPAGATION DELAY vs. TEMPERATURE RECEIVER OUTPUT CURRENT vs. RECEIVER-OUTPUT HIGH VOLTAGE RISING MAX3160E toc18 MAX3160E toc17 CL = 50pF RDIFF = 54Ω DI 2V/div CL = 50pF RDIFF = 54Ω DI 2V/div 300 FALLING VY - V Z 2V/div VY - V Z 2V/div 250 200 CL = 50pF RDIFF = 54Ω DATA RATE = 250kbps 150 100 -40 -15 10 35 60 1.0µs/div 20ns/div 85 MAX3160E/MAX3161E/MAX3162E Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to ground, TA = +25°C, unless otherwise noted.) TEMPERATURE (°C) RS-485/RS-422 RECEIVER PROPAGATION (FAST = VCC, 5Mbps) I-V OUTPUT IMPEDANCE CURVE IN RS-232 SHUTDOWN MODE 200 OUTPUT CURRENT (µA) MAX3160E toc20 MAX3160E toc19 400 RS-485/RS-422 RECEIVER PROPAGATION (FAST = VCC, 5Mbps) MAX3160E toc21 CL = 15pF VY - V Z 2V/div CL = 50pF RDIFF = 54Ω DE485 2V/div 0 -200 -400 VY - V Z 2V/div RO 2V/div -600 -800 -1000 -20 -15 -10 -5 0 5 10 15 20 4ns/div 100ns/div OUTPUT VOLTAGE (V) _______________________________________________________________________________________ 7 Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩ to ground, TA = +25°C, unless otherwise noted.) MAX3160E RS-232 TRANSMITTER PROPAGATION (FAST = GND, 250kbps) MAX3160E RS-232 TRANSMITTER PROPAGATION (FAST = VCC, 250kbps) MAX3160E toc22 MAX3160E toc23 CL = 1000pF RL = 7kΩ CL = 150pF RL = 7kΩ DI 2V/div DI 2V/div T_OUT 5V/div T_OUT 5V/div 1.0µs/div 1.0µs/div MAX3161E/MAX3162E RS-232 TRANSMITTER PROPAGATION (FAST = GND, 250kbps) MAX3161E/MAX3162E RS-232 TRANSMITTER PROPAGATION (FAST = VCC, 250kbps) MAX3160E toc25 MAX3160E toc24 CL = 150pF RL = 7kΩ CL = 1000pF RL = 7kΩ DI 2V/div T_OUT 5V/div T_OUT 5V/div 1.0µs/div TRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (FAST = GND) SUPPLY CURRENT vs. SUPPLY VOLTAGE WITH RS-232 RUNNING (FAST = GND) 2.50 0 -2.50 -5.00 MAX3160E toc27 10 SUPPLY CURRENT (mA) 5.00 8 6 4 CL = 50pF RL = 3kΩ 1 TRANSMITTER AT 250kbps 2 -7.50 0 -10.00 2.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 8 12 MAX3160E toc26 INPUTS AT VCC AND GND 2 TRANSMITTERS LOADED WITH 3kΩ 7.50 DI 2V/div 1.0µs/div 10.00 TRANSMITTER OUTPUT VOLTAGE (V) MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers 5.5 6.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers PIN NAME FUNCTION MAX3160E MAX3161E MAX3162E 1 1 1 C1+ Positive Terminal of the Positive Flying Capacitor 2 2 2 VCC Positive Supply Voltage 3 3 3 C1- Negative Terminal of the Positive Flying Capacitor 4 4 4 GND Ground — 5 5 T1OUT 5 — — Z(B)/T1OUT — — 6 Z — 6 — Z(B) 6 — — Y(A)/T2OUT — — 7 Y — 7 — Y(A) RS-232 Driver Output Inverting RS-485/RS-422 Driver Output in Full-Duplex Mode (and Inverting RS-485/RS-422 Receiver Input in Half-Duplex Mode)/RS-232 Driver Output Inverting RS-485/RS-422 Driver Output Inverting RS-485/RS-422 Driver Output in Full-Duplex Mode (and Inverting RS-485/RS-422 Receiver Input in Half-Duplex Mode) Noninverting RS-485/RS-422 Driver Output in Full-Duplex Mode (and Noninverting RS-485/RS-422 Receiver Input in Half-Duplex Mode)/RS-232 Driver Output Noninverting RS-485/RS-422 Driver Output Noninverting RS-485/RS-422 Driver Output in Full-Duplex Mode (and Noninverting RS-485/RS-422 Receiver Input in Half-Duplex Mode) 7 9 9 R1OUT RS-232 Receiver Output — 8 8 T2OUT RS-232 Driver Output 8 10 — RO/R2OUT 9 11 13 SHDN Active-Low Shutdown-Control Input. Drive SHDN low to shut down transmitters and charge pump. — — 10 R2OUT RS-232 Driver Output 10 12 14 FAST — — 11 RO 11 13 — RS-485/RS-232 — — 12 RE485 RS-485/RS-422 Receiver Enable Input. Logic-level low enables RS-485/RS-422 receivers. 12 14 — HDPLX Pin-Selectable Mode Functionality Input. Operates in fullduplex mode when low; operates in half-duplex mode when high. RS-485/RS-422 Receiver Output/RS-232 Receiver Output Transmitter Speed-Select Input. Select slew-rate limiting for RS-232 and RS-485/RS-422. Slew-rate limits with a logic-level low. RS-485/RS-422 Receiver Output Pin-Selectable Mode Functionality Input. Operates as RS-485/RS-422 with a logic-level high; operates as RS-232 with a logic-level low. _______________________________________________________________________________________ 9 MAX3160E/MAX3161E/MAX3162E Pin Description MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers Pin Description (continued) PIN NAME FUNCTION MAX3160E MAX3161E MAX3162E 13 — — A/R2IN Noninverting RS-485/RS-422 Receiver Input/RS-232 Receiver Input 14 — — B/R1IN Inverting RS-485/RS-422 Receiver Input/RS-232 Receiver Input — — 15 RE232 RS-232 Receiver Enable. Logic-level low enables RS-232 receivers. — 15 17 A 15 19 — DE485/T2IN — — 16 TE232 — 16 18 B 16 20 — DI/T1IN — 17 19 R2IN 17 21 25 V- 10 Noninverting RS-485/RS-422 Receiver Input RS-485/RS-422 Driver Enable/RS-232 Driver Input RS-232 Transmitter Output Enable Inverting RS-485/RS-422 Receiver Input RS-485/RS-422 Driver Input/RS-232 Driver Input RS-232 Receiver Input Negative Charge-Pump Rail — 18 20 R1IN RS-232 Receiver Input 18 22 26 C2- Negative Terminal of the Negative Flying Capacitor 19 23 27 C2+ Positive Terminal of the Negative Flying Capacitor 20 24 28 V+ — — 21 T2IN — — 22 DE485 — — 23 DI — — 24 T1IN Positive Charge-Pump Rail RS-232 Driver Input RS-485/RS-422 Driver Enable Input RS-485/RS-422 Driver Input RS-232 Driver Input ______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers RS-485 MODE RS-232 MODE VCC C1+ V+ 1 20 C3 C1 2 3 VCC C2+ CHARGE PUMP C1- 2 19 C2 C2- 3 18 CBYPASS CBYPASS 4 C1 GND V- 4 17 C1+ V+ VCC C2+ LOGIC OUTPUTS T1 T2 R1 7 R2 8 9 SHDN 5 16 15 ESD PROTECTION 6 ESD PROTECTION 5 LOGIC INPUTS 13 HDPLX 12 RS-485 OUTPUTS 6 VZ Y 7 14 RS-232 INPUTS R0 LOGIC OUTPUT 8 R 20 C3 18 17 10 FAST LOGIC INPUTS 15 DE485 B A 14 RS-485 INPUTS 13 12 MAX3160E C4 16 HDPLX RS-485/RS-232 11 C2 19 D 9 SHDN MAX3160E 10 FAST C2- GND C4 RS-232 OUTPUTS CHARGE PUMP C1- ESD PROTECTION 1 ESD PROTECTION VCC LOGIC INPUT RS-485/RS-232 11 ______________________________________________________________________________________ 11 MAX3160E/MAX3161E/MAX3162E MAX3160E Functional Diagram ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers MAX3160E/MAX3161E/MAX3162E MAX3161E Functional Diagram RS-232 MODE RS-485 MODE VCC VCC 1 C1+ V+ 1 24 C3 C1 2 3 VCC C2+ CHARGE PUMP C1- 23 2 3 22 CBYPASS CBYPASS 4 GND V- 4 21 V+ VCC C2+ 24 C3 C1 C2 C2- C1+ CHARGE PUMP C1- C2- GND V- 23 C2 22 21 C4 9 LOGIC OUTPUTS 10 11 SHDN 12 FAST 12 T2 R1 16 R2 15 MAX3161E 7 18 17 HDPLX 14 RS-485/RS-232 13 6 RS-485 OUTPUTS RS-232 INPUTS 20 Z Y LOGIC INPUTS 19 D 18 DE485 8 17 ESD PROTECTION 8 19 LOGIC INPUTS ESD PROTECTION 7 5 20 ESD PROTECTION 6 RS-232 OUTPUT T1 5 ESD PROTECTION RS-232 OUTPUT C4 9 R0 LOGIC OUTPUT 10 R 11 SHDN 12 FAST B A HDPLX MAX3161E 16 RS-485 INPUTS 15 14 RS-485/RS-232 13 ______________________________________________________________________________________ LOGIC INPUT ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers Test Circuits Y R VCC 1 C1+ V+ VCC C2+ VOD 28 C3 C1 2 3 CHARGE PUMP C1- C2- GND V- C2 RS-485 OUTPUTS 7 Figure 1. RS-485/RS-422 Driver DC Test Load C4 24 Z Y ESD PROTECTION 6 D 22 S2 211 Figure 2. RS-485/RS-422 and RS-232 Receiver Enable/Disable Timing Test Load R1 20 RO R ESD PROTECTION RS-232 INPUTS R2 11 LOGIC INPUT 12 1k T2 9 10 VCC S1 CL LOGIC INPUTS DE485 1kΩ TEST POINT RECEIVER OUTPUT 23 RS-232 8 OUTPUT LOGIC OUTPUTS Z 25 T1 RS-232 5 OUTPUT VOC 26 CBYPASS 4 R 27 19 B A RE485 3V 18 RS-485 INPUTS DE485 17 Y DI 13 SHDN TE232 MAX3162E 14 FAST RE-232 16 15 VOD RDIFF LOGIC INPUTS CL Z Figure 3. RS-485/RS-422 Driver Timing Test Circuit OUTPUT UNDER TEST 500Ω S1 VCC CL S2 Figure 4. RS-485/RS-422 Driver Enable/Disable Timing Test Load ______________________________________________________________________________________ 13 MAX3160E/MAX3161E/MAX3162E MAX3162E Functional Diagram MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers Test Circuits (continued) +3V +3V 0V 1.5V 1.5V INPUT INPUT 1.5V 0V VCC OUTPUT V+ 50% 50% tPHL 0V V- OUTPUT GND tPLH tPLH tPHL tSKEW = | tPLH - tPHL | tRSKEW = | tPLH - tPHL | Figure 6. RS-232 Transmitter Propagation-delay Timing Figure 5. RS-232 Receiver Propagation-Delay Timing 3V DI 1.5V 0 1.5V tDPHL tDPLH 1/2 VO 1/2 VO 10% tDR 0 tDF tDSKEW = | tDPLH - tDPHL | tDZH A -1V B VCC/2 OUTPUT tRPHL tDHZ Figure 8. RS-485/RS-422 Driver Enable and Disable Times 3V RE232 OR RE485 0 VCC/2 VOH - 0.5V 2.3V 10% VOL + 0.5V OUTPUT NORMALLY HIGH Y, Z 90% VOH 1V tDLZ 2.3V OUTPUT NORMALLY LOW VDIFF = Vy - Vz 90% Figure 7. RS-485/RS-422 Driver Propagation Delays VOL 1.5V VOL Y RO 1.5V Y, Z VO VO 0 -VO 3V DE485 0 tDZL Z VDIFF 1.5V 1.5V 1.5V tRZL tRPLH tRLZ VCC RO 1.5V OUTPUT NORMALLY LOW RO 1.5V INPUT VOL + 0.5V OUTPUT NORMALLY HIGH tRSKEW = | tRPLH - tRPHL | VOH - 0.5V 0 tRZH tRHZ Figure 10. MAX3162 RS-485/RS-422 and RS-232 Receiver Enable and Disable Times Figure 9. RS-485/RS-422 Receiver Propagation Delays B VID R A RO CL Figure 11. RS-485/RS-422 Receiver Propagation Delays Test Circuit 14 ______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers The MAX3160E/MAX3161E/MAX3162E +3V to +5.5V, multiprotocol transceivers can be pin-configured in a number of RS-232 and RS-485/RE-422 interface combinations. These circuit configurations are ideal for the design of RS-232 to RS-485 converters, multiprotocol buses, or any application that requires both RS-232 and RS-485 transceivers. The slew rate of these devices is on-the-fly pin selectable, allowing reduced EMI data rates, or up to 10Mbps RS-485 communications. Power consumption can be reduced to 10nA by using the shutdown function, but the RS-232 receivers remain active allowing other devices to query the interface controller. A flow-through pinout and the space-saving SSOP packages (available in commercial and extended temperature ranges) facilitate board layout. Device Selection The MAX3160E/MAX3161E/MAX3162E contain RS-232 transceivers and an RS-485/RS-422 transceiver. The primary difference between the devices is the multiplexing of the I/O ports. The MAX3160E has common transmitter outputs and receiver inputs for its RS-232 and RS-485/RS-422 transceivers, and common digital I/O ports. The MAX3160E is optimized for multiprotocol operation on a single interface bus and comes in a 20-pin SSOP package. The MAX3161E has separate transmitter outputs and receiver inputs for its RS-232 and RS-485/RS-422 transceivers, and common digital I/O ports. The MAX3161E is optimized for multiplexing a single UART across two interface buses and is available in a 24-pin SSOP package. The MAX3162E has separate transmitter outputs and receiver inputs for its RS-232 and RS-485/RS-422 transceivers, and separate digital I/O ports. The MAX3162E is optimized for protocol translation between two interface buses and comes in a 28-pin SSOP package. See Tables 1–12, the Functional Diagrams, and the following descriptions for details on each device. MAX3160E The MAX3160E is a 2T X /2R X RS-232 transceiver in RS-232 mode, capable of RS-232-compliant communication. Assertion of RS-485/RS-232 converts the device to a single RS-485 transceiver by multiplexing the RS232 I/O ports to an RS-485 driver and receiver pair. The logic inputs now control the driver input and the driver enable. One logic output carries the RS-485 receiver output, and the other is tri-stated. The receiver input impedance is dependent on the device mode and is 1/4-unit load for RS-485 operation and 5kΩ for RS-232 operation. MAX3161E The MAX3161E is a 2T X /2R X RS-232 transceiver in RS-232 mode or a single RS-485/RS-422 transceiver in RS-485 mode. When in RS-485 mode, the unused RS232 transmitter and receiver outputs are disabled. When in RS-232 mode, the RS-485 transmitter outputs are disabled and the RS-232 receiver inputs are 5kΩ to GND. The RS-485 receiver inputs are always 1/8-unit load. Logic lines are shared between the two protocols and are used for signal inputs and as an RS-485 driver enable. MAX3162E The MAX3162E is a 2Tx/2Rx RS-232 transceiver and a single RS-485/RS-422 transceiver simultaneously. All drivers, receivers, and transmitters can be enabled or disabled by pin selection. All outputs are high-impedance when not activated. RS-232 receiver inputs are 5kΩ when enabled, and RS-485 receiver inputs are 1/8-unit load. Fast-Mode Operation The FAST control input is used to select the slew-rate limiting of the RS-232 transmitters and the RS-485/ RS-422 drivers. With FAST unasserted, the RS-232 transmitters and the RS-485/RS-422 driver are slew-rate limited to reduce EMI. RS-232 data rates up to 1Mbps and RS-485/RS-422 data rates up to 10Mbps are possible when FAST is asserted. FAST can be changed during operation without interrupting data communications. Half-Duplex RS-485/RS-422 Operation Asserting HDPLX places the MAX3160E/MAX3161E in half-duplex mode. The RS-485 receiver inputs are internally connected to the driver outputs. To receive RS-485 data, disable the RS-485 outputs by driving DE485 low. HDPLX has no affect on RS-232 operation. Low-Power Shutdown The MAX3160E/MAX3161E/MAX3162E have an activelow shutdown control input, SHDN. When SHDN is driven low, the charge pump and transmitters are shut down and supply current is reduced to 10nA. The RS-232 receiver outputs remain active if in RS-232 mode. The charge-pump capacitors must be recharged when coming out of shutdown before resuming operation in either RS-232 or RS-485/RS-422 mode (Figure 12). Dual Charge-Pump Voltage Converter The MAX3160E/MAX3161E/MAX3162E’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump), and -5.5V (inverting charge pump), for input voltages (V CC) over the +3.0V to +5.5V range. The charge pumps operate in a discontinuous mode. If the ______________________________________________________________________________________ 15 MAX3160E/MAX3161E/MAX3162E Detailed Description MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers magnitude of either output voltage is less than +5.5V, the charge pumps are enabled. If the magnitude of both output voltages exceeds +5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (see the Functional Diagrams). RS-485/RS-422 Transceivers The MAX3160E/MAX3161E/MAX3162E RS-485/RS-422 transceivers feature fail-safe circuitry that guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see the Fail-Safe Section). The MAX3160E/MAX3161E/ MAX3162E also feature pin-selectable reduced slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps The transmitters can operate at speeds up to 10Mbps with the slew-rate limiting disabled. Drivers are short-circuit current limited and thermally limited to protect them against excessive power dissipation. Half-duplex communication is enabled by driving HDPLX high (MAX3160E/MAX3161E.) Fail-Safe The MAX3160E/MAX3161E/MAX3162E guarantee a logic-high RS-485 receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. This is done by having the receiver threshold between -50mV and -200mV. If the differential receiver input voltage (A-B) is greater than or equal to -50mV, RO is logic-high. If A-B is less than or equal to -200mV, RO is logic-low. In the case of a terminated bus with all transmitters disabled, the receiver’s differential input voltage is pulled to 0 by the termination. This results in a logic-high with a 50mV minimum noise margin. The receivers convert RS-232 signals to CMOS-logic output levels. All receivers have inverting outputs that remain active in shutdown. The MAX3160E/MAX3161E/ MAX3162E permit their receiver inputs to be driven to ±25V. Floating receiver input signals are pulled to ground through internal 5kΩ resistors, forcing the outputs to a logic-high. The MAX3162E has transmitter and receiver enable pins that allow its outputs to be tri-stated. ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The MAX3160E/ MAX3161E/MAX3162E receiver inputs and transmitter outputs have extra protection against static electricity found in normal operation. Maxim’s engineers developed state-of-the-art structures to protect these pins against ±15kV ESD, without damage. After an ESD event, the MAX3160E/MAX3161E/MAX3162E continue working without latchup. The receiver inputs and transmitter outputs are characterized for ±15kV ESD protection using the Human Body Model ESD Test Conditions ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results. Human Body Model Figure 13a shows the Human Body Model, and Figure 13b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a 1.5kΩ resistor. RS-232 Transceivers The MAX3160E/MAX3161E/MAX3162E RS-232 transmitters are inverting-level translators that convert CMOS-logic levels to ±5V EIA/TIA-232-compliant levels. The transmitters are guaranteed at a 250kbps data rate in slew-rate limited mode (FAST = GND) with worst-case loads of 3kΩ in parallel with 1000pF. Data rates up to 1Mbps can be achieved by asserting FAST. When powered down or in shutdown, the MAX3160E/ MAX3161E/MAX3162E outputs are high impedance and can be driven to ±13.2V. The transmitter inputs do not have pullup resistors. Connect unused inputs to ground or VCC. 16 ______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers T1OUT 2V/div GND T2OUT 2V/div CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF MAX3160E/MAX3161E/MAX3162E RC 1MΩ SHDN 5V/div RD 1.5kΩ DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR 40µs/div Figure 12. RS-232 Transmitter Outputs when Exiting Shutdown Machine Model The Machine Model for ESD testing uses a 200pF storage capacitor and zero-discharge resistance. It mimics the stress caused by handling during manufacturing and assembly. Of course, all pins (not just RS-485 inputs) require this protection during manufacturing. Therefore, the Machine Model is less relevant to the I/O ports than are the Human Body Model and IEC 1000-4-2. Applications Information Figure 13a. Human Body ESD Test Model IP 100% 90% Ir AMPERES 36.8% 10% 0 0 Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. Ceramic chip capacitors with an X7R dielectric provide the best combination of performance, cost, and size. The charge pump requires 0.1µF capacitors for 3.3V operation. For other supply voltages, see Table 13 for required capacitor values. Do not use values smaller than those listed in Table 13. Increasing the capacitor values reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be changed without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, C4, and CBYPASS to maintain the proper ratios to the other capacitors. When using the minimum required capacitor values, make sure the capacitance value does not degrade excessively with temperature or voltage. This is typical of Y5V and Z5U dielectric ceramic capacitors. If in doubt, use capacitors with a larger nominal value. The capacitor’s equivalent series resistance (ESR), which PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) tRL TIME tDL CURRENT WAVEFORM Figure 13b. Human Body Model Current Waveform usually rises at low temperatures, influences the amount of ripple on V+ and V-. Power-Supply Decoupling In applications that are sensitive to power-supply noise, decouple VCC to ground with a capacitor of the same value as reservoir capacitors C2, C3, and C4. Connect the bypass capacitor as close to the IC as possible. ______________________________________________________________________________________ 17 MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers RS-232 Transmitter Outputs when Exiting Shutdown Figure 12 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). Each transmitter is loaded with 3kΩ in parallel with 1000pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when V- exceeds approximately -3V. VCC CBYPASS C1+ 256 Transceivers on the Bus The standard RS-485 receiver input impedance is 12kΩ (one-unit load), and the standard driver can drive up to 32-unit loads. The MAX3160E has a 1/4-unit load receiver input impedance (48kΩ), allowing up to 128 transceivers to be connected in parallel on one communication line. The MAX3161E/MAX3162E have a 1/8unit load receiver input impedance (96kΩ), allowing up to 256 transceivers to be connected in parallel on one communication line. Any combination of these devices and/or other RS-485 transceivers with a total of 32-unit loads or fewer can be connected to the line. RS-485/RS-422 Driver Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range (see the Typical Operating Characteristics). The second, a thermal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive, typically over +150°C. Protection Against Wiring Faults EIA/TIA-485 standards require a common input voltage range of -7V to +12V to prevent damage to the device. 18 V+ C1 C3 C1C2+ C2 C2- MAX3160E MAX3161E MAX3162E VC4 T_ OUT T_ IN High Data Rates The MAX3160E/MAX3161E/MAX3162E maintain the RS-232 ±5V required minimum transmitter output voltage even at high data rates. Figure 14 shows a transmitter loopback test circuit. Figure 15 shows a loopback test result at 250kbps, and Figure 16 shows the same test at 1Mbps. Figure 15 demonstrates a single slew-rate limited transmitter driven at 250kbps (FAST = GND) into an RS-232 load in parallel with 1000pF. Figure 17 shows a single transmitter driven at 1Mbps (FAST asserted), loaded with an RS-232 receiver in parallel with 1000pF. These transceivers maintain the RS-232 ±5V minimum transmitter output voltage at data rates up to 1Mbps. VCC R_ IN R_ OUT 1000pF 5k VCC SHDN GND Figure 14. Loopback Test Circuit The MAX3160E/MAX3161E/MAX3162E inputs are protected to RS-232 levels of ±25V for the receiver inputs and ±13V for the transmitter/driver outputs. This provides additional protection for the RS-485 transceivers against ground differential or faults due to miswiring. RS-485/RS-422 Reduced EMI and Reflections The MAX3160E/MAX3161E/MAX3162E can be configured for slew-rate limiting by pulling FAST low. This minimizes EMI and reduces reflections caused by improperly terminated cables. Operation in slew-rate limited mode reduces the amplitudes of high-frequency harmonics. RS-485/RS-422 Line Length vs. Data Length The RS-485/RS-422 standard covers line lengths up to 4000ft. For line lengths greater than 4000ft, use the repeater application shown in Figure 17. RS-232/RS-485 Protocol Translator Figure 18 shows the MAX3162E configured as an RS-232/RS-485 protocol translator. The direction of translation is controlled through the RTS signal (R1IN). The single-ended RS-232 receiver input signal is translated to a differential RS-485 transmitter output. Similarly, a differential RS-485 receiver input signal is translated to a single-ended RS-232 transmitter output. RS-232 data received on R2IN is transmitted as an RS485 signal on Z and Y. RS-485 signals received on A and B are transmitted as an RS-232 signal on T1OUT. ______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers TIN TOUT 5V/div TOUT 5V/div ROUT ROUT 1µs/div 1µs/div Figure 15. MAX3161E/MAX3162E RS-232 Loopback Test Result at 250kbps, FAST = Low Multiprotocol Bus The Typical Operating Circuit shows a standard application for the MAX3160E. The MAX3160E’s outputs are multiplexed between RS-232 and RS-485 protocols by a microprocessor (µP). The µP also directs the shutdown functions, enable lines, and the duplex of the MAX3160E. Data is transmitted to the MAX3100 UART through an SPI™ port. The UART asynchronously transfers data through the MAX3160E to the pin-selected RS-232 or RS-485 protocal. See Table 14 for commonly used cable connections. 200ns/div Figure 16. MAX3161E/MAX3162E RS-232 Loopback Test Result at 1Mbps, FAST = High Multiprotocol Bus Multiplexer The Typical Application Circuit shows the MAX3161E configured as a multiprotocol bus multiplexer. The MAX3161E separates the RS-232 and RS-485 lines, but shares the logic pins between modes. This application allows the µP to monitor a point-to-point RS-232 bus, and a multidrop RS-485 interface. The MAX3100 UART asynchronously transfers data through the MAX3161E to the pin-selected RS-232 or RS-485 protocol. SPI is a registered trademark of Motorola, Inc. ______________________________________________________________________________________ 19 MAX3160E/MAX3161E/MAX3162E ROUT TIN MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers 3.3V MAX3160E MAX3161E MAX3162E A CBYPASS 100nF 120Ω RO R RE485 DATA IN B 2 27 C2 100nF DE485 Z DI D Y 26 120Ω 13 DATA OUT 5 RCV 10 23 NOTE: RE485 ON MAX3162E ONLY 19 TX 20 RTS 15 Figure 17. RS-485 Line Repeater 16 14 28 C2+ VCC C1+ C2- MAX3162E C1- 3 C1 100nF SHDN T1OUT T1IN 24 R2IN 11 RO 9 R1OUT 12 RE485 22 DE485 R1IN A RE232 B TE232 Z FAST Y R2OUT DI V+ GND V- C3 100nF Figure 18. Protocol Translator 20 1 ______________________________________________________________________________________ 17 18 6 7 25 C4 100nF ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers RS-232 Receivers Truth Tables Table 4. MAX3160E Table 1. MAX3160E INPUTS OUTPUTS INPUTS SHDN RS-485/ RS-232 DI/T1IN, DE485/T2IN Z(B)/T1OUT, Y(A)/T2OUT SHDN 0 X X 1/8-unit load 1 0 0 1 1 0 1 0 1 1 X RS-485 mode OUTPUTS RS-485/ RS-232 B/R1IN, A/R2IN R1OUT, RO/R2OUT X 0 0 1 X 0 1 0 X 0 Inputs open 1 R1OUT X 1 X RO/R2OUT in RS-485 mode Table 2. MAX3161E INPUTS OUTPUTS SHDN RS-485/ RS-232 DI/T1IN, DE485/T2IN T1OUT, T2OUT 0 X X High-impedance 1 0 0 1 1 0 1 0 1 1 X High-impedance Table 5. MAX3161E INPUTS OUTPUTS SHDN RS-485/ RS-232 R1IN, R2IN R1OUT, RO/R2OUT X 0 0 1 X 0 1 0 X 0 Inputs open Table 3. MAX3162E SHDN 0 X 1 1 INPUTS TE232 X 0 1 1 High-impedance, T1IN,T2IN X X 0 OUTPUTS T1OUT, T2OUT High-impedance High-impedance 1 1 0 X 1 X 1 R1OUT High-impedance, RO/R2OUT in RS-485 mode Table 6. MAX3162E INPUTS OUTPUTS SHDN RE232 R1IN, R2IN R1OUT, R2OUT X 1 X High-impedance X 0 0 1 X 0 1 0 X 0 Inputs open 1 ______________________________________________________________________________________ 21 MAX3160E/MAX3161E/MAX3162E RS-232 Transmitters Truth Tables MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers RS-485/RS-422 Drivers Truth Tables Table 7. MAX3160E INPUTS OUTPUTS SHDN RS-232 RS-485/R DE485/T2IN DI/T1IN Z(B)/T1OUT Y(A)/T2OUT 0 X X X 1/8-unit load 1/8-unit load 1 1 0 X 1/8-unit load 1/8-unit load 1 1 1 0 1 0 1 1 1 1 0 1 X 0 X X RS-232 mode Table 8. MAX3161E INPUTS OUTPUTS SHDN RS-232 RS-485/R DE485/T2IN DI/T1IN Z(B) Y(A) 0 X X X 1/8-unit load 1/8-unit load X 0 X X 1/8-unit load 1/8-unit load X X 0 X 1/8-unit load 1/8-unit load 1 1 1 0 1 0 1 1 1 1 0 1 Table 9. MAX3162E INPUTS OUTPUTS SHDN DE485 DI Z Y 0 X X High-impedance High-impedance X 0 X High-impedance High-impedance 1 1 0 1 0 1 1 1 0 1 RS-485/RS-422 Receivers Truth Tables Table 10. MAX3160E INPUTS OUTPUT RS-232 RS-485/R SHDN HDPLX (A - B)* (Y - Z)* RO/R2OUT 1 0 X X X High-impedance up to VCC 1 1 0 ≥-50mV X 1 1 1 0 ≤-200mV X 0 1 1 0 Floating X 1 1 1 1 X ≥-50mV 1 1 1 1 X ≤-200mV 0 1 1 1 X Floating 1 0 X X X X 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. 22 ______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers Table 11. MAX3161E INPUTS RS-485/RS-232 SHDN HDPLX 1 0 1 1 1 1 OUTPUT A-B Y(A) - Z(B) RO/R2OUT X X X High-impedance up to VCC 0 ≥-50mV X 1 1 0 ≤-200mV X 0 1 0 Floating X 1 1 1 1 X ≥-50mV 1 1 1 1 X ≤-200mV 0 1 1 1 X Floating 1 0 X X X X RS-232 mode Table 12. MAX3162E INPUTS OUTPUT Table 13. Required Minimum Capacitance Values SHDN RE485 A-B RO 0 X X High-impedance SUPPLY VOLTAGE (V) C1 (µF) C2, C3, C4, CBYPASS (µF) X 1 X High-impedance +3.0 to +3.6 0.1 0.1 1 0 ≥-50mV 1 +4.5 to +5.5 0.047 0.33 1 0 ≤-200mV 0 +3.0 to +5.5 0.1 0.47 1 0 Inputs 1 ______________________________________________________________________________________ 23 MAX3160E/MAX3161E/MAX3162E RS-485/RS-422 Receivers Truth Tables (continued) MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers Table 14. Cable Connections Commonly Used for EIA/TIA-232 and V.24 Asynchronous Interfaces EIA/TIA-232 STANDARD CONNECTOR PIN MAX3160E MAX3161E MAX3162E EQUIVALENT MAX3160E MAX3161E DCD 1 — — — — Data carrier detect RD 2 R2IN 13 17 19 Received data TD 3 T1OUT 5 5 5 Transmitted data PIN NUMBER FUNCTION (AS SEEN BY DTE) MAX3162E DTR 4 — — — — Data terminal ready SG 5 GND 4 4 4 Signal ground DSR 6 — — — — Data set ready RTS 7 T2OUT 6 8 8 Request to send (= DTE ready) CTS 8 R1IN 14 18 20 Clear to send (= DCE ready) RI 9 — — — — Ring indicator Typical Application Circuit +3.3V 2 VCC TX MAX3100 UART 20 12 10 RTS 11 19 10 9 CTS DB9 T1OUT DI/T1IN 13 RX 14 HDPLX RO/R2OUT R2IN DE485/T2IN T2OUT R1OUT MAX3161E R1IN RS-232 5 17 8 18 1 RS-485 Y(A) SPI GND 4 µP FAST 12 RJ45 7 Z(B) RS-485/ 6 RS-232 SHDN 13 11 RS-485/RS-232 SHDN MULTIPROTOCOL BUS MULTIPLEXER 24 ______________________________________________________________________________________ ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers TOP VIEW C1+ 1 20 V+ C1+ 1 24 V+ C1+ 1 28 V+ VCC 2 19 C2+ VCC 2 23 C2+ VCC 2 27 C2+ C1- 3 18 C2- C1- 3 22 C2- C1- 3 26 C2- GND 4 17 V- GND 4 21 V- GND 4 25 V- Z(B)/T1OUT 5 MAX3160E Y(A)/T2OUT 6 16 DI/T1IN T1OUT 5 MAX3161E 20 DI/T1IN T1OUT 5 24 T1IN MAX3162E 15 DE485/T2IN Z(B) 6 19 DE485/T2IN Z 6 R1OUT 7 14 B/R1IN Y(A) 7 18 R1IN Y 7 RO/R2OUT 8 13 A/R2IN T2OUT 8 17 R2IN T2OUT 8 21 T2IN SHDN 9 12 HDPLX R1OUT 9 16 B R1OUT 9 20 R1IN FAST 10 11 RS-485/RS-232 RO/R2OUT 10 15 A R2OUT 10 19 R2IN SSOP SHDN 11 14 HDPLX FAST 12 13 RS-485/RS-232 SSOP 23 DI 22 DE485 RO 11 18 B RE485 12 17 A SHDN 13 16 TE232 FAST 14 15 RE232 SSOP Selector Guide PART DUAL MODE FLOWTHROUGH PINOUT RS-485 INPUT UNIT LOADS MAX3160E No Yes 1/4 MAX3161E No No 1/8 MAX3162E Yes Yes 1/8 Chip Information TRANSISTOR COUNT: 1805 PROCESS: CMOS ______________________________________________________________________________________ 25 MAX3160E/MAX3161E/MAX3162E Pin Configurations Package Information 2 SSOP.EPS MAX3160E/MAX3161E/MAX3162E ±15kV ESD-Protected, +3.0V to +5.5V, 10nA, RS-232/RS-485/RS-422 Multiprotocol Transceivers 1 INCHES E H MILLIMETERS DIM MIN MAX MIN MAX A 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C 0.20 0.09 0.004 0.008 SEE VARIATIONS D E e 0.205 0.212 0.0256 BSC 5.20 MILLIMETERS INCHES D D D D D 5.38 MIN MAX MIN MAX 0.239 0.239 0.278 0.249 0.249 0.289 6.07 6.07 7.07 6.33 6.33 7.33 0.317 0.397 0.328 0.407 8.07 10.07 8.33 10.33 N 14L 16L 20L 24L 28L 0.65 BSC H 0.301 0.311 7.65 7.90 L 0.025 0∞ 0.037 8∞ 0.63 0∞ 0.95 8∞ N A C B e A1 L D NOTES: 1. D&E DO NOT INCLUDE MOLD FLASH. 2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED .15 MM (.006"). 3. CONTROLLING DIMENSION: MILLIMETERS. 4. MEETS JEDEC MO150. 5. LEADS TO BE COPLANAR WITHIN 0.10 MM. PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, SSOP, 5.3 MM APPROVAL DOCUMENT CONTROL NO. 21-0056 REV. C 1 1 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. 26 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.