MAX3185 19-1076 Rev 0 9/96 15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs General Description Features The MAX3185 is a complete DTE RS-232 serial port Enhanced ESD Protection: designed to meet the stringent ESD requirements of the 15kVHuman Body Model European community. All transmitter outputs and receiv- 8kVIEC1000-4-2, Contact Discharge er inputs are protected to 15kV using IEC 1000-4-2 15kVIEC1000-4-2, Air-Gap Discharge Air-Gap Discharge, 8kV using IEC 1000-4-2 Contact Latchup Free During an ESD Event Discharge, and 15kV using the Human Body Model. The MAX3185 has three RS-232 transmitters, five RS- 20-Pin SSOP and SO Packages 232 receivers, and no charge pump, optimizing it for Guaranteed 230kbps Data Rate operation in desktop PC and motherboard applications. It is guaranteed to run at data rates up to 230kbps, pro- Flow-Through Pinout viding compatibility with popular software for communi- Pin Compatible with SN75C185 cating with personal computers. Power-supply current is less than 300A for I and I , and less than 1mA DD SS Complete DTE Serial Port for I . CC The MAX3185 is pin and functionally compatible with the industry-standard 75185, so existing designs can instantly become EMC compliant. The MAX3185 is Ordering Information available in an SO package and in the tiny SSOP that further reduces board space. PART TEMP. RANGE PIN-PACKAGE MAX3185CWP 0C to +70C 20 SO Applications MAX3185CAP 0C to +70C 20 SSOP Desktop PC MAX3185EWP -40C to +85C 20 SO MAX3185EAP -40C to +85C 20 SSOP Motherboards Instruments Equipment Meeting IEC1000-4-2 Typical Operating Circuit Pin Configuration MAX3186 MAX3185 TOP VIEW V 1 20 V R1 DD CC T1 R1IN 2 19 R1OUT T2 R2 R2IN R2OUT 3 18 RS-232 TTL/CMOS TTL/CMOS R3IN R3OUT 4 17 T3 R3 LOGIC LOGIC INTERCONNECTING T1IN T1OUT 5 16 I/O I/O T4 R4 T2OUT 6 15 T2IN CABLE R4IN 7 14 R4OUT T5 R5 T3OUT 8 13 T3IN R1 T1 R5IN 9 12 R5OUT R2 T2 V 10 11 GND SS MAX3185 R3 T3 SO/SSOP Maxim Integrated Products 1 For free samples & the latest literature: 15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs ABSOLUTE MAXIMUM RATINGS V ...........................................................................-0.3V to +7V Continuous Power Dissipation (T = +70C) CC A V .........................................................................-0.3V to +14V Wide SO (derate 10.00mW/C above +70C)..............800mW DD V ......................................................................... +0.3V to -14V SSOP (derate 8.00mW/C above +70C) ....................640mW SS Input Voltages Operating Temperature Ranges T ........................................................................-0.3V to +6V MAX3185C P.....................................................0C to +70C IN R ...................................................................................30V MAX3185E P ..................................................-40C to +85C IN Output Voltages Storage Temperature Range ............................-65C to +160C T .................................................................................15V Lead Temperature (soldering, 10sec) ............................+300C OUT R .......................................................-0.3V to (V + 0.3V) OUT CC Short-Circuit Duration T (one at a time)...............................................Continuous OUT R (one at a time) ..............................................Continuous OUT 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 = +4.5V to +5.5V, V = +10.8V to +13.2V, V = -10.8V to -13.2V, T = T to T , unless otherwise noted. Typical values CC DD SS A MIN MAX are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS V 4.5 5.5 CC Operating Voltage Range V 10.8 13.2 V DD V -13.2 -10.8 SS I No load 380 1500 CC Supply Current IDD No load 185 500 A I No load 185 500 SS LOGIC Input Logic Threshold Low V T 0.8 V ILT IN Input Logic Threshold High V T 2.0 V IHT IN Input Leakage Current 0.01 1 A Output Voltage Low V R I = 3.2mA 0.4 V OLR OUT SINK Output Voltage High VOHR ROUT ISOURCE = 1mA VCC - 0.6 V TRANSMITTER OUTPUTS V = 7.0V, V = -7.0V, R = 3k 5.0 DD SS L Output Voltage Swing V V = 12V, V = -12V, R = 3k 9.5 DD SS L Transmitter Output Resistance V = V = V = 0V, V = 2V 300 CC DD SS T OUT RS-232 Output Short-Circuit 35 60 mA Current RECEIVER INPUTS Receiver Input Voltage -25 25 V Operating Range RS-232 Input Threshold Low 0.75 V RS-232 Input Threshold High 2.4 V RS-232 Input Hysteresis 0.65 V RS-232 Input Resistance 35 7 k Receiver Output Short-Circuit 10 mA Current 2 MAX3185