LTC1383CN

LTC1383 5V Low Power RS232 Transceiver FEATURES ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO ■ ■ Operates from a Single 5V Supply Low Supply Current: ICC = 220µA ESD Protection Over ±10kV Available in 16-Pin SOIC Narrow Package Uses Small Capacitors: 0.1µF Operates to 120kBaud Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to ± 25V Without Damage Pin Compatible with LT1181A and MAX232A The LTC®1383 is an ultra-low power 2-driver/2-receiver RS232 transceiver that operates from a single 5V supply. The charge pump requires only four spacesaving 0.1µF capacitors. The supply current (ICC) of the transceiver is only 220µA with driver outputs unloaded. The LTC1383 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120kbaud with a 2500pF, 3kΩ load. Both driver outputs and receiver inputs can be forced to ± 25V without damage and can survive multiple ±10kV ESD strikes. APPLICATIO S ■ ■ Notebook Computers Palmtop Computers , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Quiescent Supply Current vs Temperature 1 0.1µF 3 4 0.1µF 5 11 VCC 300k LOGIC INPUT LOGIC OUTPUT 10 12 5k 9 5k 8 15 7 13 232 OUTPUT 232 INPUT LTC1383 VCC 300k 14 16 2 6 0.1µF 0.1µF 600 VCC = 5V TEST CONDITION: VCC = 5V 500 QUIESCENT CURRENT (µA) 400 300 200 100 0 –20 QUIESCENT CURRENT LOGIC INPUT 232 OUTPUT 0 LOGIC OUTPUT 232 INPUT LTC1383 • TA01 U 20 40 TEMPERATURE (°C) 60 80 LTC1383 • TA02 U U 1383fa 1 LTC1383 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW C1+ V+ C1– C2+ C2 – V– TR2 OUT RX2 IN 1 2 3 4 5 6 7 8 16 VCC 15 GND 14 TR1 OUT 13 RX1 IN 12 RX1 OUT 11 TR1 IN 10 TR2 IN 9 RX2 OUT Supply Voltage (VCC) ................................................ 6V Input Voltage Driver ....................................... – 0.3V to V CC + 0.3V Receiver ............................................... – 25V to 25V Digital Input ............................... – 0.3V to VCC + 0.3V Output Voltage Driver .................................................... – 25V to 25V Receiver .................................... – 0.3V to VCC + 0.3V Short-Circuit Duration V + ................................................................... 30 sec V – ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1383C ............................................... 0°C to 70°C LTC1383I ............................................ – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C ORDER PART NUMBER LTC1383CN LTC1383CS LTC1383IN LTC1383IS N PACKAGE 16-LEAD PDIP S PACKAGE 16-LEAD PLASTIC SO TJMAX = 125°C, θJA = 70°C/W (N) TJMAX = 125°C, θJA = 90°C/W (S) Consult LTC Marketing for parts specified with wider operating temperature ranges. DC ELECTRICAL CHARACTERISTICS PARAMETER Any Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Power Supply Generator V + Output Voltage V – Output Voltage CONDITIONS 3k to GND The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted. MIN Positive Negative ● ● ● ● ● ● TYP 7.0 – 6.5 1.4 1.4 – 20 ±12 1.3 1.7 0.4 5 0.2 3.2 – 40 20 8.0 7.5 – 8.0 – 7.0 MAX UNITS V V V V µA µA mA V V V kΩ V V mA mA V V V V 5.0 – 5.0 2.0 Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Input Low Threshold Input High Threshold – 10V ≤ VIN ≤ 10V Output Low, IOUT = – 1.6mA (VCC = 5V) Output High, IOUT = 160µA (VCC = 5V) Sinking Current, VOUT = VCC Sourcing Current VOUT = 0V IOUT = 0mA IOUT = 8mA IOUT = 0mA IOUT = – 8mA 0.8 5 – 40 ±9 ● ● ● ● ● 0.8 0.1 3 3.0 – 15 10 2.4 1 7 0.4 1383fa 2 U W U U WW W LTC1383 DC ELECTRICAL CHARACTERISTICS PARAMETER Power Supply VCC Supply Current Digital Input Threshold Low Digital Input Threshold High CONDITIONS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted. MIN ● ● ● ● TYP 0.22 0.35 1.4 1.4 MAX 0.5 1.0 0.8 UNITS mA mA V V No Load (Note 2), 0°C to 70°C No Load (Note 2), – 40°C to 85°C 2.0 AC CHARACTERISTICS PARAMETER Slew Rate Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL) The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted. CONDITIONS RL = 3k, CL = 51pF RL = 3k, CL = 2500pF t HLD (Figure 1) t LHD (Figure 1) t HLR (Figure 2) t LHR (Figure 2) MIN 3 ● ● ● ● TYP 8 5 2 2 0.3 0.3 MAX 30 3.5 3.5 0.8 0.8 UNITS V/µs V/µs µs µs µs µs Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: Supply current is measured with driver and receiver outputs unloaded. TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage vs Temperature 10 8 RL = 3k OUTPUT HIGH VCC = 5V DRIVER OUTPUT VOLTAGE (V) THRESHOLD VOLTAGE (V) 4 2 0 –2 –4 –6 –8 0 10 20 30 40 50 TEMPERATURE (°C) 60 70 OUTPUT LOW VCC = 4.5V VCC = 5V SUPPLY CURRENT (mA) 6 VCC = 4.5V LTC1383 • TPC01 UW Receiver Input Thresholds vs Temperature 2.2 2.0 VTH 1.8 1.6 1.4 1.2 5 35 30 25 20 15 10 45 40 Supply Current vs Data Rate VCC = 5V RL = 3k CL = 2500pF 2 DRIVERS ACTIVE VTL 1.0 0 10 40 30 50 20 TEMPERATURE (˚C) 60 70 0 0 25 50 75 100 125 DATA RATE (kBAUD) 150 175 LTC1383 • TPC02 LTC1383 • TPC03 1383fa 3 LTC1383 TYPICAL PERFOR A CE CHARACTERISTICS VCC Supply Current vs Temperature 18 16 SUPPLY CURRENT (mA) 14 12 10 8 6 4 1 DRIVER LOADED RL = 3k 2 DRIVERS LOADED RL = 3k 2 0 0 10 20 30 40 50 TEMPERATURE (°C) 60 70 LTC1383 • TPC04 PI FU CTIO S VCC: 5V Input Supply Pin. This pin should be decoupled with a 0.1µF ceramic capacitor. GND: Ground Pin. V +: Positive Supply Output (RS232 Drivers). V + ≅ 2V CC – 2V. This pin requires an external capacitor C = 0.1µF for charge storage. The capacitor may be tied to ground or VCC. With multiple devices, the V + and V – pins may share a common capacitor. For large numbers of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V –: Negative Supply Output (RS232 Drivers). V – ≅ – (2VCC – 2V). This pin requires an external capacitor C = 0.1µF for charge storage. C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These pins require two external capacitors C = 0.1µF: one from C1+ to C1– and another from C2+ to C2 –. To maintain 4 UW Driver Output Waveforms DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k INPUT Receiver Output Waveforms RECEIVER OUTPUT CL = 51pF INPUT LTC1383 • TPC05 LTC1383 • TPC06 5µs/DIV 5µs/DIV U U U charge pump efficiency, the capacitor’s effective series resistance should be less than 2Ω. TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. The inputs of unused drivers can be left unconnected since 300k input pull-up resistors to VCC are included on chip. TR OUT: Driver Outputs at RS232 Voltage Levels. The driver outputs are protected against ESD to ±10kV for human body model discharges. RX IN: Receiver Inputs. These pins can be forced to ± 25V without damage. The receiver inputs are protected against ESD to ±10kV for human body model discharges. Each receiver provides 0.4V of hysteresis for noise immunity. RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels. 1383fa LTC1383 SWITCHI G TI E WAVEFOR S DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD LTC1383 • F01 Figure 1. Driver Propagation Delay Timing TEST CIRCUITS Driver Timing Test Load DRIVER OUTPUT DRIVER 51pF 3k DRIVER INPUT LTC1383 • TA03 0.1µF 0.1µF LOGIC INPUT LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT W W U RX INPUT RX OUTPUT t LHR 1.7V VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V LTC1383 • F02 0V V– Figure 2. Receiver Propagation Delay Timing Receiver Timing Test Load RX OUTPUT RX INPUT RX 51pF LTC1383 • TA04 ESD Test Circuit 1 3 4 5 11 VCC 300k 10 12 5k 9 5k 8 15 7 13 232 OUTPUT 232 INPUT RS232 LINE PINS PROTECTED TO ± 10kV LTC1383 VCC 300k 14 16 2 6 0.1µF 0.1µF VCC 232 OUTPUT 232 INPUT LTC1383 • TA05 1383fa 5 LTC1383 TYPICAL APPLICATIO S Paralleling Power Supply Generator with Common Storage Capacitors 1 0.1µF 3 4 0.1µF 5 11 VCC 300k LOGIC INPUT LOGIC OUTPUT 10 12 5k 9 5k LTC1383 VCC 300k LOGIC INPUT LOGIC OUTPUT 6 U 16 2 6 VCC = 5V 0.1µF 0.1µF 1 0.1µF 3 4 0.1µF 5 11 VCC 300k LTC1383 VCC 300k 16 2 6 VCC = 5V 14 232 OUTPUT LOGIC INPUT 14 232 OUTPUT 7 13 232 OUTPUT 232 INPUT LOGIC INPUT LOGIC OUTPUT 10 12 5k 9 5k 7 13 232 OUTPUT 232 INPUT 8 15 232 INPUT LOGIC OUTPUT 8 15 232 INPUT LTC1383 • TA06 1383fa LTC1383 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 +0.889 8.255 –0.381 ( ) INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) NOTE: 1. DIMENSIONS ARE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .770* (19.558) MAX 16 15 14 13 12 11 10 9 .255 ± .015* (6.477 ± 0.381) 1 2 3 4 5 6 7 8 .130 ± .005 (3.302 ± 0.127) .020 (0.508) MIN .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .120 (3.048) MIN .100 (2.54) BSC .018 ± .003 (0.457 ± 0.076) N16 1002 1383fa 7 LTC1383 PACKAGE DESCRIPTIO .045 ±.005 .050 BSC N 16 15 14 .245 MIN 1 .030 ±.005 TYP 2 3 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) RELATED PARTS PART NUMBER LT1780/LT1781 LTC1382 LTC1384 LTC1385 LTC1386 DESCRIPTION 5V, 2 Driver, 2 Receiver RS232 Transeivers 5V, 2 Driver, 2 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver COMMENTS ± 15kV ESD per IEC 1000-4 220µA Supply Current, 0.2µA in Shutdown 220µA Supply Current, 2 Receivers Active in Shutdown 220µA Supply Current, 2 Receivers Active in Shutdown 220µA Supply Current, Narrow 16-pin SO 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● linear.com U S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 13 12 11 10 9 N .160 ±.005 .228 – .244 (5.791 – 6.197) N/2 .150 – .157 (3.810 – 3.988) NOTE 3 2 3 4 5 6 7 8 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) .014 – .019 (0.355 – 0.483) TYP .050 (1.270) BSC S16 0502 1383fa LW/TP 1002 1K REV A • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 1994