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| LTC1338 5V Low Power RS232 5-Driver/3-Receiver Transceiver FEATURES s s s s s s s s s DESCRIPTIO s s Low Supply Current: 500A 0.2A Supply Current in SHUTDOWN 50A Supply Current in RECEIVER ALIVE Mode 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 Flowthrough Architecture The LTC1338 is a 5-driver/ 3-receiver RS232 transceiver with very low supply current. In the no load condition, the supply current is only 500A. The charge pump only requires four 0.1F capacitors. In SHUTDOWN mode, the supply current is further reduced to 0.2A. In RECEIVER ALIVE mode, all three receivers are kept alive and the supply current is 50A. All RS232 outputs assume a high impedance state in SHUTDOWN and with the power off. The LTC1338 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud with a 2500pF, 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 s S Battery-Powered Modems Battery-Powered DCE Notebook Computers Palmtop Computers TYPICAL APPLICATI V+ C1 0.1F C2 0.1F DRIVER 1 OUT DRIVER 2 OUT RX1 IN DRIVER 3 OUT RX2 IN DRIVER 4 OUT RX3 IN DRIVER 5 OUT RX ENABLE NC VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 5-Drivers/3-Receivers with SHUTDOWN 28 LTC1338 27 26 25 24 23 22 21 20 19 18 17 16 15 C3 0.1F DRIVER 1 IN DRIVER 2 IN RX1 OUT DRIVER 3 IN RX2 OUT DRIVER 4 IN RX3 OUT DRIVER 5 IN GND DRIVER ENABLE NC LTC1338 * TA01 V- C4 0.1F 1200 1000 QUIESCENT CURRENT (A) 800 600 400 200 0 -40 SHUTDOWN CURRENT QUIESCENT CURRENT -20 TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC. U Supply Current 1.2 1.0 SHUTDOWN CURRENT (A) UO UO 0.8 0.6 0.4 0.2 0 100 0 20 40 60 TEMPERATURE (C) 80 LTC1338 * TA02 1 LTC1338 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW V+ C1+ C1- 1 3 4 28 V - 27 C2 + 26 C2 - 25 DR1 IN 24 DR2 IN 23 RX1 OUT 22 DR3 IN 21 RX2 OUT 20 DR4 IN 19 RX3 OUT 18 DR5 IN 17 GND 16 DR ENABLE 15 NC VCC 2 Supply Voltage (VCC) ................................................ 6V Input Voltage Driver ....................................... - 0.3V to V CC + 0.3V Receiver ............................................... - 25V to 25V Driver/Receiver Enable 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 (LTC1338C) ........................ 0C to 70C Industrial (LTC1338I) ........................ - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C ORDER PART NUMBER LTC1338CG LTC1338CN LTC1338CS LTC1338IG LTC1338IN LTC1338IS DR1 OUT 5 DR2 OUT 6 RX1 IN 7 DR3 OUT 8 RX2 IN 9 DR4 OUT 10 RX3 IN 11 DR5 OUT 12 RX ENABLE 13 NC 14 N PACKAGE G PACKAGE 28-LEAD PLASTIC DIP 28-LEAD SSOP S PACKAGE 28-LEAD PLASTIC SOL TJMAX = 125C, JA = 96C/W (G) TJMAX = 125C, JA = 56C/W (N) TJMAX = 125C, JA = 85C/W (S) DC ELECTRICAL CHARACTERISTICS 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 Power Supply Generator V + Output Voltage V - Output Voltage Supply Rise Time CONDITIONS 3k to GND VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted. MIN Positive Negative q q q q q q q q q TYP 7.0 - 6.5 1.4 1.4 12 10 MAX UNITS V V V V A mA A V V V k V V mA A V V V V ms 5.0 - 5.0 2.0 Input Low Level (VOUT = High) Input High Level (VOUT = Low) 0 VIN VCC VOUT = 0V SHUTDOWN, VOUT = 20V (Note 3) Input Low Threshold Input High Threshold - 10V VIN 10V Output Low, IOUT = - 1.6mA (VCC = 5V) Output High, IOUT = 160A (VCC = 5V) Sinking Current, VOUT = VCC SHUTDOWN, 0 VOUT VCC (Note 3) IOUT = 0mA IOUT = 12mA IOUT = 0mA IOUT = - 12mA SHUTDOWN to Turn-On 0.8 5 500 0.8 0.1 3 3.5 - 15 q q q 1.3 1.7 0.4 5 0.2 4.8 - 40 1 8.0 7.5 - 8.0 - 7.0 0.2 2.4 1 7 0.4 10 2 U W U U WW W LTC1338 DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted. PARAMETER Power Supply VCC Supply Current CONDITIONS No Load (All Driver VIN = VCC)(Note 2) 0C TA 70C No Load (All Driver VIN = 0V)(Note 2) 0C TA 70C No Load (All Driver VIN = VCC)(Note 2) - 40C TA 85C No Load (All Driver VIN = 0V)(Note 2) - 40C TA 85C RECEIVER ALIVE Mode (Note 4) SHUTDOWN (Note 3) MIN TYP 0.5 1.0 0.5 1.0 50 0.2 1.4 1.4 MAX 1.0 1.5 1.5 2.0 80 10 0.8 UNITS mA mA mA mA A A V V q q q q Supply Leakage Current (VCC) Driver/Receiver Enable Threshold Low Driver/Receiver Enable Threshold High 2.0 AC CHARACTERISTICS PARAMETER Slew Rate Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL) VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, 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) MIN 3 q q q q TYP 8 5 2 2 0.3 0.2 MAX 30 3.5 3.5 0.8 0.8 UNITS V/s V/s s s s s The q denotes specifications which apply over the operating temperature range of 0C to 70C or - 40C to 85C. 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. The VDRIVER ENABLE and VRECEIVER ENABLE = VCC. Note 3: Supply current and leakage current measurements in SHUTDOWN are performed with VDRIVER ENABLE and VRECEIVER ENABLE = 0V. Note 4: Supply current measurement in RECEIVER ALIVE mode is performed with VDRIVER ENABLE = 0V and VRECEIVER ENABLE = VCC. TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage 10 8 RL = 3k OUTPUT HIGH VCC = 5V VCC = 4.5V DRIVER OUTPUT VOLTAGE (V) THRESHOLD VOLTAGE (V) 4 2 0 -2 -4 -6 -8 -40 -20 OUTPUT LOW VCC = 4.5V VCC = 5V 20 0 60 40 TEMPERATURE (C) 80 100 SUPPLY CURRENT (mA) 6 LTC1338 * TPC01 UW Receiver Input Thresholds 2.2 2.0 1.8 VTH 1.6 1.4 1.2 1.0 -40 -20 60 50 40 30 20 10 0 Supply Current vs Data Rate VCC = 5V RL = 3k CL = 2500pF 5 DRIVERS ACTIVE VTL 40 20 60 0 TEMPERATURE (C) 80 100 0 20 80 60 100 40 DATA RATE (k BAUD) 120 140 LTC1338 * TPC02 LTC1338 * TPC03 3 LTC1338 TYPICAL PERFOR A CE CHARACTERISTICS VCC Supply Current 30 25 5 DRIVERS LOADED RL = 3k 40 LEAKAGE CURRENT (A) SHORT-CIRCUIT CURRENT (mA) SUPPLY CURRENT (mA) 20 15 10 5 0 -40 -20 1 DRIVER LOADED RL = 3k 40 20 60 0 TEMPERATURE (C) LTC1338 * TPC04 Receiver Short-Circuit Current 60 SHORT-CIRCUIT CURRENT (mA) 50 40 ISC- 30 ISC+ 20 LTC1338 * TPC08 LTC1338 * TPC09 10 -40 -20 40 20 0 60 TEMPERATURE (C) PI FU CTIO S VCC: 5V Input Supply Pin. Supply current less than 0.2A in the SHUTDOWN mode. This pin should be decoupled with a 0.1F ceramic capacitor. GND: Ground Pin. RECEIVER ENABLE: TTL/CMOS Compatible Enable Pin. Refer to Table 1 for its functional description. This pin can not float. DRIVER ENABLE: TTL/CMOS Compatible Enable Pin. Refer to Table 1 for its functional description. This pin can not float. 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 20. 4 UW 80 100 Driver Leakage in Shutdown 50 20 18 16 14 12 10 8 6 4 0 -40 -20 40 20 0 60 TEMPERATURE (C) 80 100 Driver Short-Circuit Current VOUT = -20V 30 ISC- ISC+ 20 VOUT = 20V 10 0 -40 -20 20 0 60 40 TEMPERATURE (C) 80 100 LTC1338 * TPC05 LTC1338 * TPC06 Driver Output Waveforms DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k Receiver Output Waveforms RECEIVER OUTPUT CL = 50pF INPUT INPUT 80 100 LTC1338 * TPC07 U U U LTC1338 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, RECEIVER ALIVE mode or VCC = 0V. The driver outputs are protected against ESD to 10kV for human body model discharges. Table 1. Functional Description MODE SHUTDOWN Receiver Disable RECEIVER ALIVE Normal RX ENABLE 0 0 1 1 DR ENABLE 0 1 0 1 DRIVERS All driver outputs are high impedance. All drivers alive. All driver outputs are high impedance. All drivers alive. RECEIVERS All receiver outputs are high impedance. All receiver outputs are high impedance. All receivers alive. All receivers alive. ICC (A)(TYP) 0.2 500 50 500 SWITCHI G TI E WAVEFOR S DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD LTC1338 * F01 Figure 1. Driver Propagation Delay Timing W W U U U U 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 or RECEIVER DISABLE mode to allow data line sharing. RX INPUT RX OUTPUT t LHR 1.7V VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V LTC1338 * F02 0V V- Figure 2. Receiver Propagation Delay Timing 5 LTC1338 TEST CIRCUITS Driver Timing Test Load Receiver Timing Test Load DRIVER INPUT DRIVER OUTPUT DRIVER 51pF 3k RX OUTPUT RX INPUT RX 51pF LTC1338 * F04 LTC1338 * F03 ESD Test Circuit V+ C1 0.1F C2 0.1F DRIVER 1 OUT DRIVER 2 OUT RS232 LINE PINS PROTECTED TO 10kV RX1 IN DRIVER 3 OUT RX2 IN DRIVER 4 OUT RX3 IN DRIVER 5 OUT RX ENABLE NC VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1338 28 27 26 25 24 23 22 21 20 19 18 17 16 15 C3 0.1F DRIVER 1 IN DRIVER 2 IN RX1 OUT DRIVER 3 IN RX2 OUT DRIVER 4 IN RX3 OUT DRIVER 5 IN GND DRIVER ENABLE NC LTC1338 * TC01 V- C4 0.1F 6 LTC1338 PACKAGE DESCRIPTIO U 0.0256 (0.65) BSC 0.010 - 0.015 (0.25 - 0.38) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). Dimensions in inches (millimeters) unless otherwise noted. G Package 28-Lead SSOP 0.397 - 0.407* (10.07 - 10.33) 0.205 - 0.212* (5.20 - 5.38) 0.068 - 0.078 (1.73 - 1.99) 0 - 8 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.005 - 0.009 (0.13 - 0.22) 0.022 - 0.037 (0.55 - 0.95) 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 0.301 - 0.311 (7.65 - 7.90) 0.045 (1.14) N Package 28-Lead Plastic DIP 0.070 (1.778) TYP 28 27 26 25 24 23 1.455 (36.957) MAX 22 21 20 19 18 17 16 15 0.600 - 0.625 (15.240 - 15.875) 0.130 0.005 (3.302 0.127) 0.015 (0.381) MIN 0.045 - 0.065 (1.143 - 1.651) 0.009 - 0.015 (0.229 - 0.381) 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) ( +0.025 0.625 -0.015 +0.635 -0.381 15.87 ) 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) (NOTE 2) 0.697 - 0.712 (17.70 - 18.08) (NOTE 2) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.005 (0.127) RAD MIN 0.093 - 0.104 0.010 - 0.029 x 45 (2.362 - 2.642) (0.254 - 0.737) 0 - 8 TYP 0.050 (1.270) TYP 0.037 - 0.045 (0.940 - 1.143) 0.009 - 0.013 (0.229 - 0.330) NOTE 1 0.016 - 0.050 (0.406 - 1.270) 0.014 - 0.019 (0.356 - 0.482) 0.004 - 0.012 (0.102 - 0.305) NOTE 1 0.394 - 0.419 (10.007 - 10.643) NOTE: 1. 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. 2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). 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 LTC1338 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. 4-4-12 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 08/16/93 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 1093 10K REV 0 * PRINTED IN USA (c) LINEAR TECHNOLOGY CORPORATION 1993 |
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