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| LTC1337 5V Low Power RS232 3-Driver/5-Receiver Transceiver FEATURES s s s s s s s s DESCRIPTIO s s s Low Supply Current: 300A 1A Supply Current in SHUTDOWN ESD Protection: Over 10kV Operates from a Single 5V Supply Uses Small Capacitors: 0.1F 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 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 300A. The charge pump only requires four 0.1F capacitors and can supply up to 12mA of extra current to power external circuitry. In SHUTDOWN mode, the supply current is further reduced to 1A. 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// 3k load. Both driver outputs and receiver inputs can be forced to 25V without damage, and can survive multiple 10kV ESD strikes. APPLICATI s s S Notebook Computers Palmtop Computers TYPICAL APPLICATI 3-Drivers/5-Receivers with SHUTDOWN V+ C1 0.1F C2 0.1F DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1337 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1337 TA01 C3 0.1F DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND C4 0.1F QUIESCENT CURRENT OPERATING (A) V- 600 500 400 300 200 100 0 SHUTDOWN CURRENT -20 TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC 1337 TA02 U Supply Current 1.2 1.0 SHUTDOWN CURRENT (A) UO UO QUIESCENT CURRENT 0.8 0.6 0.4 0.2 0 0 20 40 60 TEMPERATURE (C) 80 1 LTC1337 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW V+ 1 VCC 2 C1+ C1- 3 4 28 V - 27 C2 + 26 C2 - 25 DR1 IN 24 RX1 OUT 23 DR2 IN 22 RX2 OUT 21 RX3 OUT 20 RX4 OUT 19 DR3 IN 18 RX5 OUT 17 GND 16 NC 15 NC 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) ........................ 0C to 70C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C ORDER PART NUMBER LTC1337CG LTC1337CN LTC1337CS DR1 OUT 5 RX1 IN 6 DR2 OUT 7 RX2 IN 8 RX3 IN 9 RX4 IN 10 DR3 OUT 11 RX5 IN 12 ON/OFF 13 NC 14 G PACKAGE N PACKAGE 28-LEAD SSOP 28-LEAD PLASTIC DIP S PACKAGE 28-LEAD PLASTIC SOL TJMAX = 125C, JA = 96C/W (G) TJMAX = 125C, JA = 56C/W (N) TJMAX = 125C, JA = 85C/W (S) Consult factory for Industrial and Military grade parts. DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, 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 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 Positive Negative q q q q q q q q q q MIN 5.0 - 5.0 2.0 TYP 7.0 - 6.5 1.4 1.4 MAX UNITS V V V V A A mA A V V V k V V mA mA A 0.8 5 -5 10 10 0.8 0.1 3 3.5 15 - 15 1.3 1.7 0.4 5 0.2 4.8 20 - 40 1 200 Output Low, IOUT = - 1.6mA (VCC = 5V) Output High, IOUT = 160A (VCC = 5V) Sourcing Current, VOUT = 0 Sinking Current, VOUT = VCC SHUTDOWN, 0 VOUT VCC (Note 3) q q 2.4 1 7 0.4 q 10 2 U W U U WW W LTC1337 DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted. PARAMETER Power Supply Generator V + Output Voltage V - Output Voltage Supply Rise Time Power Supply VCC Supply Current Supply Leakage Current (VCC) On/Off Threshold Low On/Off Threshold High CONDITIONS IOUT = 0mA IOUT = 12mA IOUT = 0mA IOUT = 12mA SHUTDOWN to Turn-On No Load (Note 2) SHUTDOWN (Note 3) q q q q MIN TYP 8.0 7.5 - 8.0 - 6.5 0.2 0.3 1 1.4 1.4 MAX UNITS V V V V ms 0.5 10 0.8 2.0 mA A V V AC CHARACTERISTICS PARAMETER Slew Rate Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL) 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 2 q q q q TYP 8 4 2 2 0.3 0.2 MAX 30 3 3 0.6 0.6 UNITS V/s V/s s s s s The q denotes specifications which apply over the operating temperature range (0C TA 70C). 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 and driver inputs tied high. Note 3: Supply current and leakage measurements in SHUTDOWN are performed with VON = 0V. TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage 10 8 DRIVER OUTPUT VOLTAGE (V) 2.0 RL = 3k OUTPUT HIGH VCC = 5V THRESHOLD VOLTAGE (V) 4 2 0 -2 -4 -6 -8 0 10 VCC = 4.5V SUPPLY CURRENT (mA) 6 OUTPUT LOW VCC = 4.5V VCC = 5V 30 20 40 50 TEMPERATURE (C) 60 70 UW 1337 G01 Receiver Input Thresholds 45 40 INPUT HIGH 35 30 25 20 15 10 5 0 0 10 30 20 40 50 TEMPERATURE (C) 60 70 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 INPUT LOW Supply Current vs Data Rate VCC = 5V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE 0 25 75 100 125 50 DATA RATE (k BAUD) 150 175 1337 G02 1337 G03 3 LTC1337 TYPICAL PERFOR A CE CHARACTERISTICS VCC Supply Current 20 16 3 DRIVERS LOADED RL = 3k 45 40 LEAKAGE CURRENT (A) SUPPLY CURRENT (mA) 14 12 10 8 6 4 2 0 0 10 35 30 25 20 15 10 5 0 VOUT = 20V VOUT = -20V SHORT-CIRCUIT CURRENT (mA) 1 DRIVER LOADED RL = 3k 30 20 40 50 TEMPERATURE (C) Receiver Short-Circuit Current 55 50 SHORT-CIRCUIT CURRENT (mA) 45 40 35 30 25 20 15 10 0 10 30 20 40 50 TEMPERATURE (C) 60 70 ISC + ISC- PI FU CTIO S VCC: 5V Input Supply Pin. Supply current less than 1A in the SHUTDOWN mode. This pin should be decoupled with a 0.1F ceramic capacitor. GND: Ground Pin. 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 1A 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 = 0.1F for charge storage. The capacitor may be tied to ground or 5V. With multiple devices, the V + and V - pins may be paralleled into common capacitors. 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 -1.5V). This pin requires an external capacitor C = 0.1F for charge storage. C1+, C1-, C2+, C2-: Commutating Capacitor Inputs. These pins require two external capacitors C = 0.1F. 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 50. 4 UW 60 70 1337 G04 1337 G07 Driver Leakage in SHUTDOWN 20 18 16 14 12 10 8 6 4 2 0 10 30 20 40 50 TEMPERATURE (C) 60 70 Driver Short-Circuit Current ISC- ISC+ 0 10 30 20 40 50 TEMPERATURE (C) 60 70 1337 G05 1337 G06 Driver Output Waveforms DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k INPUT INPUT Receiver Output Waveforms RX OUTPUT CL = 50pF U U U LTC1337 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. SWITCHI G TI E WAVEFOR S DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V RX IN 0V V+ 0V t HLD 1337 F01 Figure 1. Driver Propagation Delay Timing TEST CIRCUITS DRIVER INPUT DRIVER OUTPUT DRIVER 51pF 3k C1 0.1F 1337 F03 Figure 3. Driver Timing Test Load RS232 LINE PINS PROTECTED TO 10kV RX OUTPUT RX IN RX 51pF 1337 F04 Figure 4. Receiver Timing Test Load W W U U U U 1.7V VCC 1.3V 0V VCC 0.8V 0V t HLR 0V 1337 F02 0V V- RX OUTPUT t LHR Figure 2. Receiver Propagation Delay Timing ESD Test Circuit V+ VCC C2 0.1F DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1337 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1337 TC01 V- C3 0.1F DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND C4 0.1F 5 LTC1337 TYPICAL APPLICATI UO (1) (5) S Operation Using 5V and 12V Power Supplies V+ VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1337 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1337 TA03 V- C2 + 0.1F C2 - DRIVER IN RX OUT DRIVER IN RX OUT RX OUT RX OUT DRIVER IN RX OUT GND TO LOGIC 5V VCC + 12V V + 0.01F 0.01F C1+ C1- 0.1F DRIVER OUT RX IN DRIVER OUT RX IN TO LINE RX IN RX IN DRIVER OUT RX IN ON/0FF = 5V Typical Mouse Driving Application V+ 5V VCC C1+ C1- DCD DSR RX RTS OPTICS V- TX CTS DTR (9) RI 0.1F DRIVER OUT RX IN DRIVER OUT RX IN RX IN 1 2 3 4 5 6 7 8 9 LTC1337 28 27 26 0.1F C2 - LOGIC "0" LOGIC "0" 25 DRIVER IN 24 RX OUT 23 DRIVER IN 22 RX OUT 21 RX OUT 20 RX OUT 19 DRIVER IN 18 RX OUT 17 GND 16 15 1137 TA04 + MOUSE V+ LOGIC 0.1F MOUSE DATA RX IN 10 DRIVER OUT 11 RX IN 12 ON/OFF 13 14 LOGIC "1" DB9 6 + + V- C2 + 0.1F LTC1337 PACKAGE DESCRIPTIO U 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) PARTING LINE 0.005 - 0.009 (0.13 - 0.22) 0.022 - 0.037 (0.55 - 0.95) 0.066 - 0.070 (1.68 - 1.78) 0 - 8 0.0256 (0.65) BSC 0.010 - 0.015 (0.25 - 0.38) 0.045 (1.14) 0.002 - 0.008 (0.05 - 0.21) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0.068 - 0.078 (1.73 - 1.99) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.301 - 0.311 (7.65 - 7.90) 0.045 (1.14) N Package 28-Lead Plastic DIP 0.020 (0.508) TYP 0.070 (1.778) TYP 28 27 26 25 24 23 1.455 (36.957) MAX 22 21 0.600 - 0.625 (15.240 - 15.875) 0.130 0.005 (3.302 0.127) 0.045 - 0.055 (1.143 - 1.651) 20 19 18 17 16 15 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) MIN 0.505 - 0.560 (12.827 - 14.224) 0.125 (3.175) MIN 0.035 - 0.080 (0.889 - 2.032) 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076) ( ) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 S Package 28-Lead SOL 0.291 - 0.299 (7.391 - 7.595) 0.005 (0.127) RAD MIN 0.010 - 0.029 x 45 (0.254 - 0.737) 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. SEE NOTE 0.394 - 0.419 (10.007 - 10.643) 0.093 - 0.104 (2.362 - 2.642) 0.037 - 0.045 (0.940 - 1.143) 0.697 - 0.712 (17.70 - 18.08) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.004 - 0.012 (0.102 - 0.305) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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 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 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 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 GERMANY Linear Techonolgy GMBH Untere Hauptstr. 9 D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 JAPAN Linear Technology KK 5F YZ Bldg. Iidabashi, Chiyoda-Ku Tokyo, 102 Japan Phone: 81-3-3237-7891 FAX: 81-3-3237-8010 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 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 World Headquarters Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 LT/GP 0893 10K REV 0 * PRINTED IN USA (c) LINEAR TECHNOLOGY CORPORATION 1993 |
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