LTC1337 5V Low Power RS232 3-Driver/5-Receiver Transceiver U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Low Supply Current: 300µA 1µA Supply Current in SHUTDOWN ESD Protection: Over ±10kV Operates from a Single 5V Supply Uses Small Capacitors: 0.1µF Operates to 120k Baud Three-State Outputs Are High Impedance When Off Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to ±25V without Damage Pin Compatible with LT1137A and LT1237 Flowthrough Architecture UO APPLICATI ■ In SHUTDOWN mode, the supply current is further reduced to 1µA. All RS232 outputs assume a high impedance state in SHUTDOWN and with the power off. The LTC1337 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud with a 1000pF// 3kΩ load. Both driver outputs and receiver inputs can be forced to ±25V without damage, and can survive multiple ±10kV ESD strikes. Notebook Computers Palmtop Computers UO ■ S The LTC1337 is a 3-driver/5-receiver RS232 transceiver with very low supply current. In the no load condition, the supply current is only 300µA. The charge pump only requires four 0.1µF capacitors and can supply up to 12mA of extra current to power external circuitry. TYPICAL APPLICATI V+ VCC C2 0.1µF DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF 2 LTC1337 V– 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 C3 0.1µF C4 0.1µF DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN 600 1.2 500 1.0 400 GND 0.6 300 0.4 200 SHUTDOWN CURRENT 100 0 RX5 OUT 0.8 QUIESCENT CURRENT –20 0 20 40 60 TEMPERATURE (°C) SHUTDOWN CURRENT (µA) C1 0.1µF 28 1 Supply Current QUIESCENT CURRENT OPERATING (µA) 3-Drivers/5-Receivers with SHUTDOWN 0.2 80 0 TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC 1337 TA01 1337 TA02 1 LTC1337 U U RATI GS W W W W AXI U U ABSOLUTE PACKAGE/ORDER I FOR ATIO (Note 1) Supply Voltage (VCC) ................................................ 6V Input Voltage Driver ....................................... – 0.3V to V CC + 0.3V Receiver ............................................... – 25V to 25V On/Off Pin.................................. – 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 Commercial (LTC1337C) ........................ 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 V+ 1 28 V – VCC 2 27 C2 + C1+ 3 26 C2 – C1– 4 25 DR1 IN DR1 OUT 5 24 RX1 OUT RX1 IN 6 23 DR2 IN DR2 OUT 7 22 RX2 OUT RX2 IN 8 21 RX3 OUT RX3 IN 9 20 RX4 OUT RX4 IN 10 19 DR3 IN DR3 OUT 11 LTC1337CG LTC1337CN LTC1337CS 18 RX5 OUT RX5 IN 12 17 GND ON/OFF 13 16 NC NC 14 15 NC G PACKAGE N PACKAGE 28-LEAD SSOP 28-LEAD PLASTIC DIP S PACKAGE 28-LEAD PLASTIC SOL TJMAX = 125°C, θJA = 96°C/W (G) TJMAX = 125°C, θJA = 56°C/W (N) TJMAX = 125°C, θJA = 85°C/W (S) Consult factory for Industrial and Military grade parts. DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. PARAMETER Any Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current 2 CONDITIONS RL = 3k to GND RL = 3k to GND Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = 5V VIN = 0 VOUT = 0V SHUTDOWN, VOUT = ±20V (Note 3) Input Low Threshold Input High Threshold Output Low, IOUT = – 1.6mA (VCC = 5V) Output High, IOUT = 160µA (VCC = 5V) Sourcing Current, VOUT = 0 Sinking Current, VOUT = VCC SHUTDOWN, 0 ≤ VOUT ≤ VCC (Note 3) Positive Negative MIN TYP ● ● 5.0 – 5.0 ● ● 2.0 7.0 – 6.5 1.4 1.4 ±10 10 ● ● ● 0.8 ● 0.1 3 ● 0.8 5 –5 ● ● ● ● MAX 3.5 15 – 15 1.3 1.7 0.4 5 0.2 4.8 20 – 40 1 200 2.4 1 7 0.4 10 UNITS V V V V µA µA mA µA V V V kΩ V V mA mA µA LTC1337 DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. PARAMETER Power Supply Generator V + Output Voltage CONDITIONS MIN IOUT = 0mA IOUT = 12mA IOUT = 0mA IOUT = 12mA SHUTDOWN to Turn-On V – Output Voltage Supply Rise Time Power Supply VCC Supply Current Supply Leakage Current (VCC) On/Off Threshold Low On/Off Threshold High TYP MAX UNITS 8.0 7.5 – 8.0 – 6.5 0.2 No Load (Note 2) SHUTDOWN (Note 3) ● ● ● 2.0 ● V V V V ms 0.3 1 1.4 1.4 0.5 10 0.8 TYP 8 4 2 2 0.3 0.2 MAX 30 mA µA V V AC CHARACTERISTICS PARAMETER Slew Rate 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) MIN 2 ● ● ● ● The ● denotes specifications which apply over the operating temperature range (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 3 0.6 0.6 Note 2: Supply current is measured with driver and receiver outputs unloaded and driver inputs tied high. Note 3: Supply current and leakage measurements in SHUTDOWN are performed with VON = 0V. U W TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage Receiver Input Thresholds RL = 3k OUTPUT HIGH VCC = 5V 6 THRESHOLD VOLTAGE (V) DRIVER OUTPUT VOLTAGE (V) 8 VCC = 4.5V 4 2 0 –2 OUTPUT LOW –4 VCC = 4.5V –6 Supply Current vs Data Rate 2.0 45 1.9 40 1.8 INPUT HIGH SUPPLY CURRENT (mA) 10 1.7 1.6 1.5 INPUT LOW 1.4 1.3 –8 0 10 30 20 40 50 TEMPERATURE (°C) 70 1337 G01 30 25 20 15 10 0 1.1 60 35 5 1.2 VCC = 5V VCC = 5V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE 0 10 30 20 40 50 TEMPERATURE (°C) 60 70 1337 G02 0 25 75 100 125 50 DATA RATE (k BAUD) 150 175 1337 G03 3 LTC1337 U W TYPICAL PERFOR A CE CHARACTERISTICS Driver Leakage in SHUTDOWN Driver Short-Circuit Current 20 16 40 18 14 3 DRIVERS LOADED RL = 3k 12 10 8 1 DRIVER LOADED RL = 3k 6 4 35 30 25 15 10 2 0 0 30 20 40 50 TEMPERATURE (°C) 10 60 VOUT = –20V 20 5 0 SHORT-CIRCUIT CURRENT (mA) 45 LEAKAGE CURRENT (µA) SUPPLY CURRENT (mA) VCC Supply Current 20 VOUT = 20V 14 12 ISC– 10 ISC+ 8 6 4 2 0 70 16 10 30 20 40 50 TEMPERATURE (°C) 60 70 0 10 30 20 40 50 TEMPERATURE (°C) 1337 G05 1337 G04 70 1337 G06 Driver Output Waveforms Receiver Short-Circuit Current 60 Receiver Output Waveforms 55 DRIVER OUTPUT RL = 3k CL = 2500pF SHORT-CIRCUIT CURRENT (mA) 50 45 ISC– 40 RX OUTPUT CL = 50pF DRIVER OUTPUT RL = 3k 35 INPUT 30 + ISC 25 INPUT 20 15 10 0 10 30 20 40 50 TEMPERATURE (°C) 60 70 1337 G07 U U U PI FU CTIO S VCC: 5V Input Supply Pin. Supply current less than 1µA in the SHUTDOWN mode. This pin should be decoupled with a 0.1µF ceramic capacitor. leled into common capacitors. For large numbers of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. GND: Ground Pin. V –: Negative Supply Output (RS232 Drivers). V – ≅ (2VCC –1.5V). This pin requires an external capacitor C = 0.1µF for charge storage. ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic low puts the device in the SHUTDOWN mode which reduces input supply current to less than 1µA and places all drivers and receivers in high impedance state. V +: Positive Supply Output (RS232 Drivers). V + ≅ 2VCC – 1V. This pin requires an external capacitor C = 0.1µF for charge storage. The capacitor may be tied to ground or 5V. With multiple devices, the V + and V – pins may be paral- 4 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 charge pump efficiency, the capacitor’s effective series resistance should be less than 50Ω. LTC1337 U U U PI FU CTIO S DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/ CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. DRIVER OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in SHUTDOWN mode or VCC = 0V. 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. Outputs are in a high impedance state when in SHUTDOWN mode to allow data line sharing. W U W SWITCHI G TI E WAVEFOR S DRIVER INPUT VCC 1.4V 0V 0V t LHD 1.3V 0V V+ DRIVER OUTPUT VCC 1.7V RX IN 1.4V V– VCC RX OUTPUT 0V 0.8V t LHR t HLD 0V 0V t HLR 1337 F02 1337 F01 Figure 1. Driver Propagation Delay Timing Figure 2. Receiver Propagation Delay Timing TEST CIRCUITS DRIVER INPUT ESD Test Circuit DRIVER OUTPUT DRIVER 51pF V+ 3k C1 0.1µF VCC C2 0.1µF 1337 F03 Figure 3. Driver Timing Test Load DRIVER 1 OUT RX1 IN RS232 LINE PINS PROTECTED TO ±10kV RX OUTPUT RX IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN RX 51pF DRIVER 3 OUT RX5 IN ON/OFF 1337 F04 28 1 2 LTC1337 V– 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 C3 0.1µF C4 0.1µF DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND 1337 TC01 Figure 4. Receiver Timing Test Load 5 LTC1337 UO TYPICAL APPLICATI S Operation Using 5V and 12V Power Supplies + 12V V + 0.01µF 0.01µF 1 C1+ 3 26 C1– 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 DRIVER OUT RX IN DRIVER OUT RX IN TO LINE RX IN RX IN DRIVER OUT RX IN ON/0FF = 5V 2 28 LTC1337 27 V– C2 + 0.1µF C2 – DRIVER IN + 5V VCC V+ VCC 0.1µF RX OUT DRIVER IN RX OUT TO LOGIC RX OUT RX OUT DRIVER IN RX OUT GND 1337 TA03 Typical Mouse Driving Application 0.1µF MOUSE 5V VCC LOGIC (1) OPTICS DB9 3 26 24 RX OUT DCD RX IN 6 23 DRIVER IN DSR DRIVER OUT 7 22 RX OUT RX RX IN 8 21 RX OUT RTS RX IN 9 20 RX OUT RI RX IN 10 DRIVER OUT 11 RX IN 12 0.1µF 0.1µF 25 DRIVER IN DTR (9) C2 + 27 5 CTS (5) V– 4 TX V– 0.1µF LTC1337 DRIVER OUT C1– V+ 6 2 C1+ 28 1 19 DRIVER IN + V+ + C2 – LOGIC “0” LOGIC “0” MOUSE DATA LOGIC “1” 18 RX OUT 17 GND ON/OFF 13 16 14 15 1137 TA04 LTC1337 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise notes. G Package 28-Lead SSOP 0.397 – 0.407 (10.07 – 10.33) 0.205 – 0.212 (5.20 – 5.38) 0.066 – 0.070 (1.68 – 1.78) PARTING LINE 0.068 – 0.078 (1.73 – 1.99) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0° – 8° 0.005 – 0.009 (0.13 – 0.22) 0.301 – 0.311 (7.65 – 7.90) 0.045 (1.14) 0.0256 (0.65) BSC 0.010 – 0.015 (0.25 – 0.38) 0.022 – 0.037 (0.55 – 0.95) 0.002 – 0.008 (0.05 – 0.21) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0.045 (1.14) N Package 28-Lead Plastic DIP 0.600 – 0.625 (15.240 – 15.875) 95° ± 5° 0.009 – 0.015 (0.229 – 0.381) +0.025 0.625 –0.015 +0.635 15.87 –0.381 ( 0.020 (0.508) TYP 0.130 ± 0.005 (3.302 ± 0.127) 0.070 (1.778) TYP 0.045 – 0.055 (1.143 – 1.651) 0.020 (0.508) MIN 27 26 25 24 23 1 2 3 4 5 6 20 19 18 17 16 15 9 10 11 12 13 14 0.505 – 0.560 (12.827 – 14.224) 0.125 (3.175) MIN ) 28 1.455 (36.957) MAX 22 21 0.035 – 0.080 (0.889 – 2.032) 0.100 ± 0.010 (2.540 ± 0.254) 0.018 ± 0.003 (0.457 ± 0.076) 7 8 S Package 28-Lead SOL 0.291 – 0.299 (7.391 – 7.595) 0.005 (0.127) RAD MIN 0.093 – 0.104 (2.362 – 2.642) 0.010 – 0.029 × 45° (0.254 – 0.737) 0.697 – 0.712 (17.70 – 18.08) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.037 – 0.045 (0.940 – 1.143) 0° – 8° TYP 0.050 0.014 – 0.019 0.009 – 0.013 (1.270) (0.356 – 0.482) (0.229 – 0.330) SEE NOTE TYP 0.016 – 0.050 (0.406 – 1.270) NOTE: PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS. 0.004 – 0.012 (0.102 – 0.305) SEE NOTE 0.394 – 0.419 (10.007 – 10.643) 1 2 3 4 5 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. 6 7 8 9 10 11 12 13 14 7 LTC1337 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 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 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 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. 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 8 Linear Technology Corporation LT/GP 0893 10K REV 0 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977 LINEAR TECHNOLOGY CORPORATION 1993