description.DREN: TTL/CMOS Compatible Enable Pin. Refer to Table1 for its functional description.V+: Positive Supply Output (RS232 Drivers). This pinrequires an external capacitor C = 0.1mF for charge stor-age. The capacitor may be tied to ground or VCC. Withmultiple devices, the V+ and V pins may be paralleled intocommon capacitors. For large numbers of devices, in-creasing the size of the shared common storage capaci-tors is recommended to reduce ripple.V : Negative Supply Output (RS232 Drivers). This pinrequires an external capacitor C = 0.1mF for chargestorage.C1+, C1 , C2+, C2 , C3+, C3 : Commutating CapacitorInputs. These pins require three external capacitors C =0.1mF: one from C1+ to C1 , another from C2+ to C2 andanother from C3+ to C3 . To maintain charge pumpefficiency, the capacitor s effective series resistance shouldbe less than 1W. Ceramic capacitors are recommended.DR IN: RS232 Driver Input Pins. Inputs are TTL/CMOScompatible. The inputs of unused drivers can be leftunc specifications which apply over the full operatingtemperature range (0 C TA 70 C for Commercial grade and 40 C TA 85 C for Industrial grade).Note 1: Absolute Maximum Ratings are those values beyond which the lifeof the device may be impaired.Note 2: Supply current is measured with driver and receiver outputsunloaded. The VDREN and VRXEN = VCC.TYPICAL PERFORMANCE CHARACTERISTICS UWDriver Output Voltage High/Lowvs Load Capacitance (CL)Supply Currentvs Driver Data RateDriver Output Voltage High/Lowvs Load Capacitance (CL)Driver Output Voltage High/Lowvs Temperature ( C)TEMPERATURE ( C)00LEAKAGE CURRENT (mA)51520255045LTC1348 G0610201030406070303540OUT = 20VOUT = 20VCC = 3.3VLOAD CAPACITANCE (pF)0 7DRIVER OUTPUT VOLTAGE HIGH/LOW 5 3 176420 2 4 631000200050005130004000CC = 3.3V 0.1mF FLYING CAPACITORS ALL DRIVERS LOADED 3kW + CL 1 DRIVER DRIVENLTC1348 G01LOAD CAPACITANCE (pF)0 7DRIVER OUTPUT VOLTAGE HIGH/LOW 5 3 176420 2 4 631000200050005130004000CC = 3.3V 0.1mF FLYING CAPACITORS ALL DRIVER AUGWAWUWARBSO LUTEXITIS WUUPACKAGE/ORDERIFORAT