MAX3161 General Description
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 trans mitter 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 logic high receiver output when the receiver inputs are open or shorted. These devices also feature pin-selectable transmitter slew rates for both RS-232 and RS-485/422 modes. Slew-rate limiting minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. Disabling slew-rate limiting allows these devices to transmit at data rates up to 10Mbps in RS-485/422 mode and up to 1Mbps in RS-232 mode. The MAX3160/MAX3161/MAX3162 feature a 1µA shutdown mode, and short-circuit limiting and thermal shutdown circuitry to protect against excessive power dissipation. 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.
MAX3161 Maximum Ratings
CC to GND................................................................-0.3V to +6V
+ to GND..................................................................-0.3V to +7V
- to GND.....................................................................0.3V to -7V
+ - V- (Note 1).....................................................................+13V
nput 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
utput Voltages
T1OUT, T2OUT, Y, Z to GND.............................................±13.2V
R2OUT, R1OUT, RO to GND.........................-0.3V to (VCC + 0.3V)
utput Short-Circuit Duration
T1OUT, T2OUT, Y, Z....................................................Continuous
Continuous Power Dissipation (TA = +70°C)
20-Pin SSOP (derate 9.1W/°C above +70°C)................728mW
24-Pin SSOP (derate 9.5W/°C above +70°C)................760mW
28-Pin SSOP (derate 10.8W/°C above +70°C)..............864mW
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
MAX3161 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
MAX3161 Typical Application
Point-of-Sales EquipmentPeripherals
Industrial ControlsNetworking
RS-232 to RS-485
Interface Converters
MAX3161 Connection Diagram
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