LTC1350I

LTC1350 3.3V Low Power EIA/TIA-562 3-Driver/ 5-Receiver Transceiver FEATURES s s DESCRIPTIO s s s s s s s s Low Supply Current 300µA Receivers 4 and 5 Kept Alive in SHUTDOWN 35µA ESD Protection ±10kV Operates from a Single 3.3V 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 EIA/TIA-562 I/O Lines Can Be Forced to ± 25V Without Damage Flowthrough Architecture The LTC1350 is a 3-driver/5-receiver EIA/TIA-562 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. In SHUTDOWN mode, two receivers are kept alive and the supply current is only 35µA. All RS232 outputs assume a high impedance state in SHUTDOWN or with the power off. The LTC1350 is fully compliant with all data rate and overvoltage EIA/TIA-562 specifications. The transceiver can operate up to 120k baud with a 1000pF and 3kΩ 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 V+ VCC C1+ C1– DR1 OUT RX1 IN DR2 OUT RX2 IN RX3 IN RX4 IN DR3 OUT RX5 IN ON/OFF NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1350 3-Drivers/5-Receivers with Shutdown 28 27 26 25 24 23 22 21 20 19 18 17 16 15 LTC1350 • TA01 Quiescent and Shutdown Supply Current vs Temperature 600 500 QUIESCENT CURRENT (µA) V– C2 + C2 – DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT GND NC NC TEST CONDITION: VCC = 3.3V ALL DRIVER INPUTS TIED TO VCC 400 300 200 100 0 –40 –20 U 85 75 65 55 45 SHUTDOWN CURRENT 35 0 100 SHUTDOWN CURRENT (µA) UO UO QUIESCENT CURRENT 40 20 60 0 TEMPERATURE (˚C) 80 LTC1350 • TA02 1 LTC1350 ABSOLUTE 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 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) ................................................ 5V 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 (LTC1350C) ........................ 0°C to 70°C Industrial (LTC1350I) ........................ – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C ORDER PART NUMBER LTC1350CG LTC1350CN LTC1350CS LTC1350IG LTC1350IN LTC1350IS VCC 2 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 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) Consult factory for Military grade parts 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 CONDITIONS 3k to GND VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. MIN Positive Negative q q q q q q TYP 4.5 – 4.5 1.4 1.4 MAX UNITS V V V V µA µA mA µA V V V kΩ V V mA µA 3.7 – 3.7 2.0 Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V SHUTDOWN (Note 3), VOUT = ± 20V Input Low Threshold Input High Threshold VIN = ± 10V Output Low, IOUT = – 1.6mA (VCC = 3.3V) Output High, IOUT = 160µA (VCC = 3.3V) Sinking Current, VOUT = VCC SHUTDOWN (Note 3), 0V ≤ VOUT ≤ VCC 0.8 5 –5 ±10 10 q q q q q q 500 0.8 0.1 3 3.0 –3 1.3 1.7 0.4 5 0.2 3.2 – 20 1 2.4 1 7 0.4 10 2 U W U U WW W LTC1350 DC ELECTRICAL CHARACTERISTICS VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. PARAMETER Power Supply Generator V + Output Voltage V – Output Voltage Supply Rise Time Power Supply VCC Supply Current CONDITIONS IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = – 5mA SHUTDOWN to Turn-On No Load (All Drivers VIN = VCC)(Note 2) 0°C ≤ TA ≤ 70°C No Load (All Drivers VIN = 0)(Note 2) 0°C ≤ TA ≤ 70°C No Load (All Drivers VIN = VCC)(Note 2) – 40°C ≤ TA ≤ 85°C No Load (All Drivers VIN = 0)(Note 2) – 40°C ≤ TA ≤ 85°C SHUTDOWN (Note 3) q q q q q q q MIN TYP 5.7 5.5 – 5.3 – 5.0 0.2 0.3 0.5 0.3 0.5 35 1.4 1.4 MAX UNITS V V V V ms ON/OFF Threshold Low ON/OFF Threshold High 0.6 1.0 1.0 1.5 50 0.8 2.0 mA mA mA mA µA V V AC CHARACTERISTICS PARAMETER Slew Rate Driver Propagation Delay (TTL to EIA/TIA-562) Receiver Propagation Delay (EIA/TIA-562 to TTL) VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. CONDITIONS RL = 3k, CL = 51pF RL = 3k, CL = 1000pF 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 0.3 MAX 30 3.5 3.5 0.8 0.8 UNITS V/µs V/µs µs µs µs µs The q denotes specifications which apply over the operating temperature range of 0°C ≤ TA ≤ 70°C for commercial grade, – 40°C ≤ TA ≤ 85°C for Industrial grade. 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. Note 3: Supply current measurement in SHUTDOWN mode is performed with VON/OFF = 0V. 3 LTC1350 TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage vs Temperature 5 4 VCC = 3.3V OUTPUT HIGH DRIVER OUTPUT VOLTAGE (V) THRESHOLD VOLTAGE (V) 3 2 1 0 –1 –2 –3 –4 –5 –40 –20 SUPPLY CURRENT (mA) ALL DRIVERS WITH LOAD, RL = 3k VCC = 3.3V OUTPUT LOW 40 20 0 60 TEMPERATURE (°C) LTC1350 • TPC01 VCC Supply Current vs Temperature 5.0 4.5 4.0 RL = 3k 3 DRIVERS LOADED LEAKAGE CURRENT (µA) 45 40 35 30 25 20 15 10 5 SHORT-CIRCUIT CURRENT (mA) SUPPLY CURRENT (mA) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 –40 –20 40 20 0 60 TEMPERATURE (°C) 80 100 RL = 3k 1 DRIVER LOADED LTC1350 • TPC04 Receiver Short-Circuit Current vs Temperature 40 SHORT-CIRCUIT CURRENT (mA) 35 30 25 20 15 ISC– 10 5 0 –40 –20 0 ISC+ LTC1350 • TPC08 LTC1350 • TPC09 40 60 20 TEMPERATURE (˚C) LTC1350 • TPC07 4 UW 80 100 Receiver Input Thresholds vs Temperature 2.2 2.0 1.8 1.6 1.4 1.2 1.0 –40 –20 30 25 20 15 10 5 0 40 20 60 0 TEMPERATURE (˚C) 80 100 Supply Current vs Data Rate VCC = 3.3V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE VTH+ VTH– 0 20 80 100 60 40 DATA RATE (k Baud) 120 140 LT1350 • TPC02 LTC1350 • TPC03 Driver Leakage in Shutdown vs Temperature 16 14 12 10 8 6 4 2 Driver Short-Circuit Current vs Temperature ISC– VOUT = – 20V ISC+ VOUT = 20V 0 0 10 30 20 40 50 TEMPERATURE (°C) 60 70 0 –40 –20 0 40 60 20 TEMPERATURE (˚C) 80 100 LTC1350 • TPC05 LTC1350 • TPC06 Driver Output Waveforms DRIVER OUTPUT RL = 3k CL = 1000pF DRIVER OUTPUT RL = 3k Receiver Output Waveform RECEIVER OUTPUT CL = 50pF INPUT INPUT 80 100 LTC1350 PI FU CTIO S VCC: 3.3V Input Supply Pin. Supply current is typically 35µA in the SHUTDOWN mode. This pin should be decoupled with a 0.1µF ceramic capacitor. GND: Ground Pin. ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic low puts the device in the SHUTDOWN mode with receivers 4 and 5 kept alive and the supply current equal to 35µA. All driver and other receiver outputs are in high impedance state. This pin cannot float. V +: Positive Supply Output. V + ≅ 2VCC – 1V. 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 be paralleled into common capacitors. For a large number of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V –: Negative Supply Output. V – ≅ – (2VCC – 1.3V). 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. DR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/ CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. DR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels. Outputs are in a high impedance state when in the 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. Receiver 1, 2 and 3 outputs are in a high impedance state when in SHUTDOWN mode to allow data line sharing. Receivers 4 and 5 are kept alive in SHUTDOWN. SWITCHI G TI E WAVEFOR S DR INPUT DR OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD LTC1350 • F01 Figure 1. Driver Propagation Delay Timing W W U U U U RX INPUT RX OUTPUT t LHR 1.7V VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V LTC1350 • F02 0V V– Figure 2. Receiver Propagation Delay Timing 5 LTC1350 TEST CIRCUITS Driver Timing Test Load DRIVER OUTPUT DRIVER 51pF 3k Receiver Timing Test Load RX OUTPUT RX INPUT RX 51pF DRIVER INPUT LTC1350 • TA04 LTC1350 • TA03 ESD Test Circuit V+ C1 0.1µF C2 0.1µF DR1 OUT RX1 IN RS232 LINE PINS PROTECTED TO ±10kV DR2 OUT RX2 IN RX3 IN RX4 IN DR3 OUT RX5 IN ON/OFF NC VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1350 28 27 26 25 24 23 22 21 20 19 18 17 16 15 DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT GND NC NC LTC1350 • TC V– C3 0.1µF C4 0.1µF 6 LTC1350 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 15.87 –0.381 ) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 S Package 28-Lead Plastic 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 × 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 LTC1350 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 1293 10K REV 0 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1993