MAX221 19-1520 Rev 0 8/99 +5V, 1A, Single RS-232 Transceiver with AutoShutdown General Description Features The MAX221 is a +5V-powered, single transmit/receive Single RS-232 Transceiver in a Small 16-Pin RS-232 and V.28 communications interface with auto- TSSOP Package matic shutdown/wake-up features and high data rate 1A Supply Current capabilities. The MAX221 achieves a low 1A supply current with AutoShutdown Saves Power Without Maxims revolutionary AutoShutdown feature. Changes to BIOS AutoShutdown saves power without changes to the Guaranteed 250kbps Data Rate existing BIOS or operating system by entering low- power shutdown mode when the RS-232 cable is dis- connected, or when the transmitter of the connected peripheral is off. The MAX221 wakes up and drives the INVALID pin high when an active RS-232 cable is con- nected, signaling the host that a peripheral is connect- ed to the communications port. Ordering Information The MAX221 is available in a 16-pin SSOP package as PART TEMP. RANGE PIN-PACKAGE well as a 16-pin TSSOP that uses 50% less board space MAX221CUE 0C to +70C 16 TSSOP than a 16-pin SO. For an equivalent RS-232 transceiver MAX221CAE 0C to +70C 16 SSOP with enhanced 15kV ESD protection, refer to the MAX221EUE -40C to +85C 16 TSSOP MAX221E data sheet. MAX221EAE -40C to +85C 16 SSOP Applications Maintenance/Diagnostic Ports Industrial Systems Telecommunications Typical Operating Circuit Set-Top Boxes +5V 15 C3 0.1F C BYPASS 0.1F V CC Pin Configuration 2 3 C1+ V+ C1 0.1F 4 C1- TOP VIEW MAX221 7 5 C2+ V- C4 EN 1 16 FORCEOFF C2 0.1F 6 0.1F C2- C1+ 2 15 V CC 11 TIN TOUT 13 V+ 3 14 GND C1- 4 MAX221 13 TOUT 9 ROUT RIN 8 C2+ 5 12 FORCEON C2- 6 11 TIN 5k V- 7 10 INVALID TO POWER- RIN 8 9 ROUT 1 10 EN INVALID MANAGEMENT UNIT TSSOP/SSOP 12 16 FORCEOFF V FORCEON CC GND 14 CAPACITORS MAY BE POLARIZED OR UNPOLARIZED. AutoShutdown is a trademark of Maxim Integrated Products. Maxim Integrated Products 1 For free samples & the latest literature: +5V, 1A, Single RS-232 Transceiver with AutoShutdown ABSOLUTE MAXIMUM RATINGS V ..........................................................................-0.3V to +6V Short-Circuit Duration, TOUT .....................................Continuous CC V+ ...............................................................(V - 0.3V) to +14V Continuous Power Dissipation (T = +70C) CC A V- ...........................................................................-14V to +0.3V TSSOP (derated 6.7mW/C above +70C) ................533mW Input Voltages SSOP (derated 7.1mW/C above +70C) ..................571mW TIN..........................................................-0.3V to (V+ + 0.3V) Operating Temperature Range RIN.................................................................................30V MAX221C .....................................................0C to +70C FORCEON, FORCEOFF, EN.................-0.3V to (V + 0.3V) MAX221E ..................................................-40C to +85C CC Output Voltages Maximum Junction Temperature ................................... +150C TOUT ..............................................(V- - 0.3V) to (V+ + 0.3V) Storage Temperature Range ........................... -65C to +150C Lead Temperature (soldering, 10sec) ............................ +300C ROUT, INVALID....................................-0.3V to (V + 0.3V) CC 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 = +5V 10%, C1C4 = 0.1F, T = T to T , unless otherwise noted. Typical values are at T = +25C.) CC A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS V Supply Current I No load, T = +25C 510 mA CC CC A Shutdown Supply Current I T = +25C, Figure 1 110 A SHDN A AutoShutdown Supply Current I 110 A AS LOGIC INPUTS Input Leakage Current I TIN = 0 to V 1 A IN CC Input Threshold Low V TIN EN, FORCEOFF, FORCEON 0.8 V IL Input Threshold High V 2.4 V TIN, EN, FORCEOFF IH Output Voltage Low V ROUT I = 3.2mA 0.4 V OL SINK Output Voltage High V ROUT I = 1.0mA 3.5 V OH SOURCE Output Leakage Current EN = V , 0 ROUT V 0.05 10 A CC CC AUTOSHUTDOWN Positive threshold 2.7 Receiver Input Threshold, Figure 3 V Transmitter Enabled Negative threshold -2.7 Receiver Input Threshold, I = 1A, Figure 3 -0.3 0.3 V CC Transmitter Disabled INVALID Output Voltage Low I = 1.6mA 0.4 V SINK INVALID Output Voltage High I = 1.0mA V - 0.6 V SOURCE CC Receiver Threshold to t Figure 3 250 s WU Transmitter Enabled Receiver Positive or Negative t Figure 3 1 s INVH Threshold to INVALID High Receiver Positive or Negative t Figure 3 30 s INVL Threshold to INVALID Low 2 MAX221