MAX3212* 19-0312 Rev 0 9/94 +2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver General Description Features The MAX3212 uses Maxims new proprietary Auto- BETTER THAN BIPOLAR Shutdown mode to reduce supply current to 1A. The 1A Supply Current Using AutoShutdown MAX3212, with 3 RS-232 drivers and 5 RS-232 receivers, Operates from Single +2.7V to +3.6V Supply is intended for 2.7V to 3.6V-powered EIA/TIA-232E and 28-Pin SSOP or Wide SO Packages V.28/V.24 serial interface. True RS-232 levels are main- Meets All EIA/TIA-232E & EIA/TIA-562 Specifications tained across the operating range. A guaranteed data Mouse DriveabilityGuaranteed rate of 235kbps provides compatibility with popular soft- Low-Cost, Surface-Mount External Components ware for communicating with personal computers. 235kbps Guaranteed Data Rate Supply current is reduced to 1 A with Maxims new LapLink Compatible AutoShutdown feature. When the MAX3212 does not +5V Logic Compatible sense a valid signal level on the receiver inputs, the on- Complementary Receiver Output Always Active board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmit- Flow-Through Pinout ters of the connected peripheral are turned off. The sys- Typical Operating Circuit tem turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves 0.68F 15H 1N6050 1N6050 power without changes to the existing software. +3.0V 0.33F 0.33F 327 1 2 16 A second power-management feature is incorporated to V V+ LN LP V- CC permit automatic shutdown when the RS-232 connection 26 FORCEON is valid but inactive. In this case, a transition detector 25 facilitates shutdown when the receivers are presented +3.0V FORCEOFF 5 with stationary RS-232 levels for long periods. TRAN MAX3212 6 INVALID Three-state drivers are provided on receiver outputs so 13 T1IN T1OUT 19 that multiple receivers, generally of different interface T1 standards, can be wire-ORed at the UART. The 14 18 T2IN T2OUT MAX3212 is available in 28-pin SO and SSOP packages. T2 15 17 T3IN T3OUT T3 8 24 R1OUT R1IN R1 Applications 5k Notebook and Palmtop Computers 9 23 R2OUT R2IN R2 Peripherals 5k Instruments 10 22 R3OUT R3IN R3 Battery-Powered Equipment 5k 21 11 R4OUT R4IN R4 Ordering Information 5k 12 20 R5OUT R5IN PART TEMP. RANGE PIN-PACKAGE R5 MAX3212CWI 0C to +70C 28 Wide SO 7 R5OUTB R5 MAX3212CAI 0C to +70C 28 SSOP 5k MAX3212EWI -40C to +85C 28 Wide SO EN GND MAX3212EAI -40C to +85C 28 SSOP 4 28 +3.0V AUTOSHUTDOWN OPERATION FORCEOFF = HIGH, FORCEON = LOW RS-232 Present Status Yes On Pin Configuration appears at end of data sheet. Shut Down No * ng Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature.+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver ABSOLUTE MAXIMUM RATINGS Supply Voltages Short-Circuit Duration, T OUT....................................Continuous V .....................................................................-0.3V to +4.6V Continuous Power Dissipation (T = +70C) CC A V+............................................................(V - 0.3V) to +7.4V Wide SO (derate 11.76mW/C above +70C)...............941mW CC V- ........................................................................-7.4V to +2.0V SSOP (derate 8.00mW/C above +70C) .....................640mW LN ..............................................................-0.3V to (V+ + 1.0V) Operating Temperature Ranges LP.......................................................(V- - 1.0V) to (V+ + 0.3V) MAX3212C I .......................................................0C to +70C Input Voltages MAX3212E I ....................................................-40C to +85C T IN, EN, FORCEON, FORCEOFF .....................-0.3V to +7.0V Storage Temperature Range .............................-65C to +150C R IN ..................................................................................25V Lead Temperature (soldering, 10sec) .............................+300C Output Voltages T OUT...............................................................................15V R OUT, R5OUTB, INVALID, TRAN............-0.3V to (V+ + 0.3V) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 2.7V to 3.6V, T = T to T , unless otherwise noted.) CC A MIN MAX PARAMETER CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Operating Voltage Range Meets or exceeds EIA/TIA-232E specifications 2.7 3.6 V All R IN unconnected, FORCEON = GND 110 A A V Supply Current FORCEOFF = GND 110 CC FORCEON = FORCEOFF = V , no load 1.5 3.0 mA CC LOGIC INPUT AND RECEIVER OUTPUTS 0.3V CC Input Logic Threshold Low T IN, EN, FORCEON, FORCEOFF V - 0.1 0.67V CC Input Logic Threshold High T IN, EN, FORCEON, FORCEOFF V + 0.1 Input Current High T IN, EN, FORCEON, FORCEOFF 1 A Input Current Low T IN, EN, FORCEON, FORCEOFF 1 A Hysteresis T IN, V = 3.3V 0.3 V CC Logic Output Voltage Low I = 1.0mA 0.4 V OUT Logic Output Voltage High I = -1.0mA V - 0.5 V OUT CC Logic Output Leakage Current EN = GND, 0V < R OUT < V 10 A CC AUTOSHUTDOWN (FORCEON = GND, FORCEOFF = V ) CC Positive threshold 3.0 Receiver Input Thresholds, Figure 4 V Transmitters Enabled Negative threshold -3.0 Receiver Input Thresholds, 1A supply current, Figure 4 -0.3 0.3 V Transmitters Disabled INVALID Output Voltage Low I = 1.0mA 0.4 V OUT INVALID Output Voltage High I = -1.0mA V - 0.6 V OUT CC Receiver Threshold to Transmitters Figure 4b 250 s Enabled, t WU Receiver Positive or Negative Figure 4 1 s Threshold to Invalid High, t INVH Receiver Positive or Negative Figure 4 30 s Threshold to Invalid Low, t INVL 2 MAX3212