LTC1383 5V Low Power RS232 Transceiver U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 LTC1383 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. UO APPLICATI ■ Notebook Computers Palmtop Computers UO ■ S TYPICAL APPLICATI 1 LOGIC INPUT 5 LTC1383 600 0.1µF VCC 300k 14 11 LOGIC OUTPUT LOGIC OUTPUT 10 7 12 13 5k 9 8 5k 15 TEST CONDITION: VCC = 5V 0.1µF 6 232 OUTPUT VCC 300k LOGIC INPUT Quiescent Supply Current vs Temperature VCC = 5V 2 3 4 0.1µF 16 232 OUTPUT 232 INPUT 232 INPUT 500 QUIESCENT CURRENT (µA) 0.1µF 400 QUIESCENT CURRENT 300 200 100 0 –20 0 20 40 TEMPERATURE (°C) 60 80 LTC1383 • TA02 LTC1383 • TA01 1 LTC1383 U U RATI GS W W W W AXI U U ABSOLUTE PACKAGE/ORDER I FOR ATIO 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 .................... 0°C to 70°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C ORDER PART NUMBER TOP VIEW C1+ 1 16 VCC V+ 2 15 GND C1– 3 14 TR1 OUT C2+ 4 13 RX1 IN C2 – 5 12 RX1 OUT V– 6 11 TR1 IN TR2 OUT 7 10 TR2 IN RX2 IN 8 9 N PACKAGE 16-LEAD PLASTIC DIP LTC1383CN LTC1383CS RX2 OUT S PACKAGE 16-LEAD NARROW PLASTIC SOIC TJMAX = 125°C, θJA = 65°C/W (N) TJMAX = 125°C, θJA = 95°C/W (S) Consult factory for Industrial and Military grade products. DC ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS Any Driver Output Voltage Swing 3k to GND 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 2 VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. MIN TYP ● ● 5.0 – 5.0 Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V ● ● 2.0 7.0 – 6.5 1.4 1.4 Input Low Threshold Input High Threshold ● ● 0.8 ● 0.1 3 – 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 Positive Negative ● ● ● ● – 20 ±12 3.0 – 15 10 1.3 1.7 0.4 5 0.2 3.2 – 40 20 8.0 7.5 – 8.0 – 7.0 MAX 0.8 5 – 40 2.4 1 7 0.4 UNITS V V V V µA µA mA V V V kΩ V V mA mA V V V V LTC1383 DC ELECTRICAL CHARACTERISTICS PARAMETER Power Supply VCC Supply Current Digital Input Threshold Low Digital Input Threshold High VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. CONDITIONS No Load (Note 2) MIN TYP MAX 0.5 0.8 2.0 0.22 1.4 1.4 TYP 8 5 2 2 0.3 0.3 MAX 30 ● ● ● AC CHARACTERISTICS PARAMETER Slew Rate mA V V VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise 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) Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL) UNITS MIN 3 ● ● ● ● The ● denotes specifications which apply over the operating temperature range of 0°C ≤ TA ≤ 70°C. Note 1: Absolute maximum ratings are those values beyond which the life of the device may be impaired. UNITS V/µs V/µs µs µs µs µs 3.5 3.5 0.8 0.8 Note 2: Supply current is measured with driver and receiver outputs unloaded. U W TYPICAL PERFORMANCE CHARACTERISTICS Receiver Input Thresholds vs Temperature Driver Output Voltage vs Temperature DRIVER OUTPUT VOLTAGE (V) 6 OUTPUT HIGH VCC = 5V 2.0 4 2 0 –2 OUTPUT LOW VCC = 4.5V –6 20 30 50 40 TEMPERATURE (°C) 1.6 VTL 1.4 35 30 25 20 15 10 5 1.0 –8 10 VTH 1.8 1.2 VCC = 5V 0 VCC = 5V RL = 3k CL = 2500pF 2 DRIVERS ACTIVE 40 VCC = 4.5V –4 45 SUPPLY CURRENT (mA) RL = 3k 8 Supply Current vs Data Rate 2.2 THRESHOLD VOLTAGE (V) 10 60 70 LTC1383 • TPC01 0 10 40 30 50 20 TEMPERATURE (˚C) 60 70 LTC1383 • TPC02 0 0 25 50 75 100 125 DATA RATE (kBAUD) 150 175 LTC1383 • TPC03 3 LTC1383 U W TYPICAL PERFORMANCE CHARACTERISTICS VCC Supply Current vs Temperature Driver Output Waveforms Receiver Output Waveforms 18 DRIVER OUTPUT RL = 3k CL = 2500pF SUPPLY CURRENT (mA) 16 14 12 DRIVER OUTPUT RL = 3k 2 DRIVERS LOADED RL = 3k 10 RECEIVER OUTPUT CL = 51pF INPUT 8 1 DRIVER LOADED RL = 3k 6 INPUT 4 LTC1383 • TPC05 LTC1383 • TPC06 2 0 0 10 20 30 50 40 TEMPERATURE (°C) 60 70 LTC1383 • TPC04 U U U PI FU CTIO S VCC: 5V Input Supply Pin. This pin should be decoupled with a 0.1µF ceramic capacitor. charge pump efficiency, the capacitor’s effective series resistance should be less than 2Ω. GND: Ground Pin. 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. 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 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. LTC1383 U W W SWITCHI G TI E WAVEFOR S DRIVER INPUT VCC 1.4V 1.4V 0V V+ DRIVER OUTPUT 0V 0V V t LHD RX OUTPUT – VCC 1.7V RX INPUT 1.3V 2.4V 0.8V t LHR t HLD 0V t HLR VCC 0V LTC1383 • F02 LTC1383 • F01 Figure 1. Driver Propagation Delay Timing Figure 2. Receiver Propagation Delay Timing TEST CIRCUITS Receiver Timing Test Load Driver Timing Test Load DRIVER INPUT RX OUTPUT DRIVER OUTPUT RX INPUT DRIVER 51pF RX 51pF 3k LTC1383 • TA04 LTC1383 • TA03 ESD Test Circuit 0.1µF 1 16 3 2 4 0.1µF LOGIC INPUT 5 LTC1383 VCC 0.1µF 6 0.1µF VCC 300k 11 14 232 OUTPUT VCC 300k LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 10 7 12 13 5k 9 8 5k 232 OUTPUT 232 INPUT RS232 LINE PINS PROTECTED TO ±10kV 232 INPUT 15 LTC1383 • TA05 5 LTC1383 U TYPICAL APPLICATIONS N Paralleling Power Supply Generator with Common Storage Capacitors 0.1µF 1 16 3 2 LTC1383 4 0.1µF LOGIC INPUT 5 VCC = 5V 0.1µF 0.1µF 6 14 11 16 3 2 LTC1383 4 0.1µF 0.1µF VCC 300k 1 5 VCC 300k 14 VCC 300k LOGIC INPUT LOGIC OUTPUT 232 OUTPUT VCC 300k 10 7 12 13 5k 9 LOGIC OUTPUT 6 11 LOGIC INPUT 232 OUTPUT VCC = 5V 8 5k LOGIC INPUT 232 OUTPUT 232 INPUT LOGIC OUTPUT 232 INPUT LOGIC OUTPUT 10 7 12 13 232 OUTPUT 5k 9 8 5k 15 232 INPUT 232 INPUT 15 LTC1383 • TA06 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. N Package 16-Lead Plastic DIP 0.770 (19.558) MAX 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 0.260 ± 0.010 (6.604 ± 0.254) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( 6 +0.025 0.325 –0.015 8.255 +0.635 –0.381 ) 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) 0.015 (0.381) MIN 0.065 (1.651) TYP 0.125 (3.175) MIN 0.045 ± 0.015 (1.143 ± 0.381) 0.100 ± 0.010 (2.540 ± 0.254) 0.018 ± 0.003 (0.457 ± 0.076) N16 0492 LTC1383 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. S Package 16-Lead Plastic SOIC 0.386 – 0.394* (9.804 – 10.008) 16 15 14 13 12 11 10 9 0.150 – 0.157* (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 2 3 4 5 6 8 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0° – 8° TYP 0.016 – 0.050 0.406 – 1.270 7 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.270) TYP SO16 0893 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). 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. 7 LTC1383 U.S. Area Sales Offices NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 NORTHWEST REGION Linear Technology Corporation 782 Sycamore Dr. Milpitas, CA 95035 Phone: (408) 428-2050 FAX: (408) 432-6331 International Sales Offices FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" 58 Chemin de la Justice 92290 Chatenay Malabry France Phone: 33-1-41079555 FAX: 33-1-46314613 KOREA Linear Technology Korea Branch Namsong Building, #505 Itaewon-Dong 260-199 Yongsan-Ku, Seoul Korea Phone: 82-2-792-1617 FAX: 82-2-792-1619 TAIWAN Linear Technology Corporation Rm. 801, No. 46, Sec. 2 Chung Shan N. Rd. Taipei, Taiwan, R.O.C. Phone: 886-2-521-7575 FAX: 886-2-562-2285 GERMANY Linear Techonolgy GmbH Untere Hauptstr. 9 D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 SINGAPORE Linear Technology Pte. Ltd. 101 Boon Keng Road #02-15 Kallang Ind. Estates Singapore 1233 Phone: 65-293-5322 FAX: 65-292-0398 UNITED KINGDOM Linear Technology (UK) Ltd. The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851 JAPAN Linear Technology KK 5F YZ Bldg. 4-4-12 Iidabashi, Chiyoda-Ku Tokyo, 102 Japan Phone: 81-3-3237-7891 FAX: 81-3-3237-8010 World Headquarters Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507 0294 8 Linear Technology Corporation LT/GP 0594 10K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977 LINEAR TECHNOLOGY CORPORATION 1994