LTC1338 5V Low Power RS232 5-Driver/3-Receiver Transceiver U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Low Supply Current: 500µA 0.2µA Supply Current in SHUTDOWN 50µA Supply Current in RECEIVER ALIVE Mode 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 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 500µA. The charge pump only requires four 0.1µF capacitors. In SHUTDOWN mode, the supply current is further reduced to 0.2µA. In RECEIVER ALIVE mode, all three receivers are kept alive and the supply current is 50µA. 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, 3kΩ load. Both driver outputs and receiver inputs can be forced to ±25V without damage, and can survive multiple ±10kV ESD strikes. UO APPLICATI ■ ■ ■ ■ S Battery-Powered Modems Battery-Powered DCE Notebook Computers Palmtop Computers UO TYPICAL APPLICATI Supply Current 5-Drivers/3-Receivers with SHUTDOWN C1 0.1µF C2 0.1µF DRIVER 1 OUT DRIVER 2 OUT RX1 IN DRIVER 3 OUT RX2 IN DRIVER 4 OUT RX3 IN DRIVER 5 OUT RX ENABLE NC 2 LTC1338 V– C4 0.1µF 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 1200 1.2 1000 1.0 DRIVER 1 IN DRIVER 2 IN RX1 OUT DRIVER 3 IN RX2 OUT DRIVER 4 IN 0.8 800 QUIESCENT CURRENT 600 0.6 0.4 400 SHUTDOWN CURRENT 200 SHUTDOWN CURRENT (µA) VCC 28 1 QUIESCENT CURRENT (µA) V+ 0.2 RX3 OUT DRIVER 5 IN 0 –40 GND DRIVER ENABLE NC –20 0 20 40 60 TEMPERATURE (°C) TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC. 80 0 100 LTC1338 • TA02 LTC1338 • TA01 1 LTC1338 W U U W W W AXI U U ABSOLUTE PACKAGE/ORDER I FOR ATIO RATI GS (Note 1) 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) ........................ 0°C to 70°C Industrial (LTC1338I) ........................ – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C DC ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS Any Driver Output Voltage Swing 3k to GND 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 2 TOP VIEW V+ ORDER PART NUMBER 28 V – 1 VCC 2 27 C2 + C1+ 3 26 C2 – C1– 4 25 DR1 IN DR1 OUT 5 24 DR2 IN DR2 OUT 6 23 RX1 OUT RX1 IN 7 22 DR3 IN DR3 OUT 8 21 RX2 OUT RX2 IN 9 20 DR4 IN DR4 OUT 10 19 RX3 OUT RX3 IN 11 18 DR5 IN DR5 OUT 12 17 GND RX ENABLE 13 16 DR ENABLE NC 14 15 NC N PACKAGE G PACKAGE 28-LEAD PLASTIC DIP 28-LEAD SSOP 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) 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) 0 ≤ VIN ≤ VCC VOUT = 0V SHUTDOWN, VOUT = ±20V (Note 3) ● ● 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 SHUTDOWN, 0 ≤ VOUT ≤ VCC (Note 3) IOUT = 0mA IOUT = 12mA IOUT = 0mA IOUT = – 12mA SHUTDOWN to Turn-On LTC1338CG LTC1338CN LTC1338CS LTC1338IG LTC1338IN LTC1338IS Positive Negative ±12 ±10 ● ● 0.8 ±5 ● ● ● MAX 3.5 – 15 1.3 1.7 0.4 5 0.2 4.8 – 40 1 8.0 7.5 – 8.0 – 7.0 0.2 ±500 2.4 1 7 0.4 10 UNITS V V V V µA mA µA V V V kΩ V V mA µA V V V V ms LTC1338 DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. PARAMETER Power Supply VCC Supply Current CONDITIONS No Load (All Driver VIN = VCC)(Note 2) 0°C ≤ TA ≤ 70°C No Load (All Driver VIN = 0V)(Note 2) 0°C ≤ TA ≤ 70°C No Load (All Driver VIN = VCC)(Note 2) – 40°C ≤ TA ≤ 85°C No Load (All Driver VIN = 0V)(Note 2) – 40°C ≤ TA ≤ 85°C RECEIVER ALIVE Mode (Note 4) SHUTDOWN (Note 3) Supply Leakage Current (VCC) Driver/Receiver Enable Threshold Low Driver/Receiver Enable Threshold High MIN TYP MAX 1.0 1.5 1.5 2.0 80 10 0.8 2.0 0.5 1.0 0.5 1.0 50 0.2 1.4 1.4 TYP 8 5 2 2 0.3 0.2 MAX 30 ● ● ● ● AC CHARACTERISTICS PARAMETER Slew Rate mA mA mA mA µA µA 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 to 70°C or – 40°C to 85°C. 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. UNITS V/µs V/µs µs µs µs µs 3.5 3.5 0.8 0.8 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. W U TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage Receiver Input Thresholds 10 6 OUTPUT HIGH VCC = 5V 4 2 0 –2 OUTPUT LOW VCC = 4.5V –4 –6 –8 –40 1.8 VTH 1.6 1.4 VCC = 5V RL = 3k CL = 2500pF 5 DRIVERS ACTIVE 50 2.0 VCC = 4.5V SUPPLY CURRENT (mA) RL = 3k THRESHOLD VOLTAGE (V) DRIVER OUTPUT VOLTAGE (V) 8 Supply Current vs Data Rate 60 2.2 VTL 40 30 20 10 1.2 VCC = 5V –20 20 0 60 40 TEMPERATURE (°C) 80 100 LTC1338 • TPC01 1.0 –40 –20 0 40 20 60 0 TEMPERATURE (˚C) 80 100 LTC1338 • TPC02 0 20 80 60 100 40 DATA RATE (k BAUD) 120 140 LTC1338 • TPC03 3 LTC1338 W U TYPICAL PERFOR A CE CHARACTERISTICS VCC Supply Current Driver Leakage in Shutdown 30 20 5 DRIVERS LOADED RL = 3k 18 SHORT-CIRCUIT CURRENT (mA) 25 40 LEAKAGE CURRENT (µA) SUPPLY CURRENT (mA) Driver Short-Circuit Current 50 20 15 10 1 DRIVER LOADED RL = 3k 5 VOUT = –20V 30 20 VOUT = 20V 10 16 ISC– 14 ISC+ 12 10 8 6 4 0 –40 –20 40 20 60 0 TEMPERATURE (°C) 80 100 0 –40 –20 40 20 0 60 TEMPERATURE (°C) 80 100 0 –40 LTC1338 • TPC05 LTC1338 • TPC04 Receiver Short-Circuit Current –20 20 0 60 40 TEMPERATURE (°C) 80 100 LTC1338 • TPC06 Driver Output Waveforms Receiver Output Waveforms SHORT-CIRCUIT CURRENT (mA) 60 DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k 50 40 ISC– RECEIVER OUTPUT CL = 50pF INPUT 30 INPUT ISC+ 20 LTC1338 • TPC08 10 –40 –20 40 20 0 60 TEMPERATURE (°C) 80 LTC1338 • TPC09 100 LTC1338 • TPC07 U U U PI FU CTIO S VCC: 5V Input Supply Pin. Supply current less than 0.2µA in the SHUTDOWN mode. This pin should be decoupled with a 0.1µF 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 = 0.1µF for 4 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 = 0.1µF 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 charge pump efficiency, the capacitor’s effective series resistance should be less than 20Ω. LTC1338 U U U PI FU CTIO S 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. 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. 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. Table 1. Functional Description RX ENABLE 0 DR ENABLE 0 Receiver Disable 0 1 RECEIVER ALIVE 1 0 Normal 1 1 DRIVERS All driver outputs are high impedance. All drivers alive. RECEIVERS All receiver outputs are high impedance. All receiver outputs are high impedance. ICC (µA)(TYP) 0.2 All driver outputs are high impedance. All drivers alive. All receivers alive. 50 All receivers alive. 500 500 W MODE SHUTDOWN U W SWITCHI G TI E WAVEFOR S DRIVER INPUT VCC 1.4V 1.4V 0V V+ DRIVER OUTPUT 0V 0V t LHD V– t HLD VCC 1.7V RX INPUT RX OUTPUT 1.3V 0V 2.4V 0.8V t LHR t HLR LTC1338 • F01 Figure 1. Driver Propagation Delay Timing VCC 0V LTC1338 • F02 Figure 2. Receiver Propagation Delay Timing 5 LTC1338 TEST CIRCUITS Receiver Timing Test Load Driver Timing Test Load DRIVER INPUT RX OUTPUT DRIVER OUTPUT RX INPUT DRIVER 51pF RX 51pF 3k LTC1338 • F04 LTC1338 • F03 ESD Test Circuit V+ C1 0.1µF VCC C2 0.1µF 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 28 1 2 LTC1338 V– C4 0.1µF 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 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 6 LTC1338 U PACKAGE DESCRIPTIO 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) 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 0.022 – 0.037 (0.55 – 0.95) 0.002 – 0.008 (0.05 – 0.21) 0.010 – 0.015 (0.25 – 0.38) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0.045 (1.14) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). N Package 28-Lead Plastic DIP 0.600 – 0.625 (15.240 – 15.875) 0.009 – 0.015 (0.229 – 0.381) ( 0.130 ± 0.005 (3.302 ± 0.127) 15.87 +0.635 –0.381 0.045 – 0.065 (1.143 – 1.651) 0.015 (0.381) MIN +0.025 0.625 –0.015 ) 1.455 (36.957) MAX 0.070 (1.778) TYP 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0.505 – 0.560 (12.827 – 14.224) 0.125 (3.175) MIN 0.035 – 0.080 (0.889 – 2.032) 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) S Package 28-Lead SOL 0.005 (0.127) RAD MIN 0.291 – 0.299 (7.391 – 7.595) (NOTE 2) 0.037 – 0.045 (0.940 – 1.143) 0.093 – 0.104 0.010 – 0.029 × 45° (2.362 – 2.642) (0.254 – 0.737) 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° – 8° TYP 0.009 – 0.013 (0.229 – 0.330) NOTE 1 0.016 – 0.050 (0.406 – 1.270) 0.050 (1.270) TYP 0.014 – 0.019 (0.356 – 0.482) 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. 0.004 – 0.012 (0.102 – 0.305) 0.394 – 0.419 (10.007 – 10.643) NOTE 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 2. 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 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 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 08/16/93 8 Linear Technology Corporation LT/GP 1093 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