LTC1384IN

LTC1384 5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown FEATURES ■ ■ DESCRIPTIO ■ ■ ■ ■ ■ ■ Operates from a Single 5V Supply Low Supply Current: ICC = 220µA ICC = 35µA in Shutdown Mode with Both Receivers Kept Alive ESD Protection Over ±10kV Uses Small Capacitors: 0.1µF Operates to 120kBaud Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to ± 25V Without Damage Pin Compatible with LT1180A The LTC®1384 is an ultra-low power 2-driver/2-receiver RS232 transceiver that operates from a single 5V supply. The charge pump requires only four spacesaving 0.1µF capacitors. The transceiver operates in one of two modes, Normal and Shutdown. In the Normal mode, ICC is only 220µA with the driver outputs unloaded. In the Shutdown mode, the charge pump is turned off, the driver outputs are forced into three-state, both receivers are kept active and ICC drops to 35µA. The receiver outputs may be forced into three-state at any time using the receiver enable (RX EN) pin. The LTC1384 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120kbaud 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. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S ■ ■ Notebook Computers Palmtop Computers TYPICAL APPLICATIO 2 0.1µF 4 5 0.1µF 6 12 VCC 300k LOGIC INPUT LOGIC OUTPUT 11 13 5k 10 18 5k LTC1384 VCC 300k 2-Drivers/2-Receivers with Shutdown and Receiver Enable 17 3 7 0.1µF 15 QUIESCENT CURRENT (µA) Quiescent and Shutdown Supply Current vs Temperature 1200 60 TEST CONDITION: VCC = 5V 1000 0.1µF VCC = 5V 800 600 400 200 0 –20 LOGIC INPUT 232 OUTPUT 8 14 232 OUTPUT 232 INPUT 0 LOGIC OUTPUT ON/OFF 9 16 232 INPUT 1 RX EN LTC1384 • TA01 U 50 SHUTDOWN CURRENT (µA) U U SHUTDOWN CURRENT 40 30 QUIESCENT CURRENT 20 10 0 20 40 TEMPERATURE (°C) 60 80 LTC1384 • TA02 1384fa 1 LTC1384 ABSOLUTE AXI U RATI GS Short-Circuit Duration V + ................................................................... 30 sec V – ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1384C ............................................... 0°C to 70°C LTC1384I ............................................ – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C Supply Voltage (VCC) ................................................ 6V Input Voltage Driver ....................................... – 0.3V to V CC + 0.3V Receiver ............................................... – 25V to 25V Digital Input ............................... – 0.3V to VCC + 0.3V Output Voltage Driver .................................................... – 25V to 25V Receiver .................................... – 0.3V to VCC + 0.3V PACKAGE/ORDER I FOR ATIO TOP VIEW RX EN C1 + V+ C1 – C2 + C2 – V – 1 2 3 4 5 6 7 8 9 20 ON/OFF 19 VCC 18 GND 17 TR1 OUT 16 RX1 IN 15 RX1 OUT 14 TR1 IN 13 TR2 IN 12 RX2 OUT 11 NC G PACKAGE 20-LEAD SSOP ORDER PART NUMBER LTC1384CG LTC1384IG TR2 OUT RX2 IN NC 10 TJMAX = 125°C, θJA = 135°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. 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 CONDITIONS 3k to GND The ● denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, RX EN = 0V, unless otherwise noted. MIN Positive Negative ● ● ● ● ● ● Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Shutdown or VCC = 0V (Note 3), VOUT = ± 10V Input Low Threshold Input High Threshold – 10V ≤ VIN ≤ 10V Output Low, IOUT = – 1.6mA (VCC = 5V) Output High, IOUT = 160µA (VCC = 5V) 2 U U W WW U W TOP VIEW RX EN 1 C1+ 2 V+ 3 C1– 4 C2+ 5 C2– 6 V– 7 TR2 OUT 8 RX2 IN 9 N PACKAGE 18-LEAD PDIP 18 ON/OFF 17 VCC 16 GND 15 TR1 OUT 14 RX1 IN 13 RX1 OUT 12 TR1 IN 11 TR2 IN 10 RX2 OUT SW PACKAGE 18-LEAD PLASTIC SO ORDER PART NUMBER LTC1384CN LTC1384CSW LTC1384IN LTC1384ISW TJMAX = 125°C, θJA = 65°C/W TJMAX = 125°C, θJA = 85°C/W TYP 7.0 – 6.5 1.4 1.4 – 20 ±12 ± 10 1.3 1.7 0.4 5 0.2 3.2 MAX UNITS V V V V µA µA mA µA V V V kΩ V V 1384fa 5.0 – 5.0 2.0 0.8 5 – 40 ± 500 ±9 ● ● ● ● ● ● 0.8 0.1 3 3.0 2.4 1 7 0.4 LTC1384 DC ELECTRICAL CHARACTERISTICS PARAMETER Output Short-Circuit Current Output Leakage Current Power Supply Generator V + Output Voltage V – Output Voltage Supply Rise Time Power Supply VCC Supply Current Supply Leakage Current (VCC) Digital Input Threshold Low Digital Input Threshold High The ● denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, RX EN = 0V, unless otherwise noted. CONDITIONS Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V EN = VCC, 0V ≤ VOUT ≤ VCC IOUT = 0mA IOUT = 8mA IOUT = 0mA IOUT = – 8mA Shutdown to Turn-On No Load (Note 2), 0°C to 70°C No Load (Note 2), –40°C to 85°C Shutdown (Note 3) ● ● ● ● ● MIN – 15 10 ● TYP – 40 20 1 8.0 7.5 – 8.0 – 7.0 0.2 0.22 0.35 35 1.4 1.4 MAX 10 UNITS mA mA µA V V V V ms 0.5 1.0 50 0.8 2.0 mA mA µA V V AC CHARACTERISTICS PARAMETER Slew Rate Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL) The ● denotes specifications which apply over the full operating temperature range. 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) MIN 3 ● ● ● ● 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 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: Measurements made in the Shutdown mode are performed with VON/OFF = 0V. TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage vs Temperature 10 8 DRIVER OUTPUT VOLTAGE (V) RL = 3k OUTPUT HIGH VCC = 5V VCC = 4.5V SUPPLY CURRENT (mA) 6 4 2 0 –2 –4 –6 –8 0 10 THRESHOLD VOLTAGE (V) OUTPUT LOW VCC = 4.5V VCC = 5V 20 30 40 50 TEMPERATURE (°C) 60 70 UW Receiver Input Thresholds vs Temperature 2.2 2.0 VTH 1.8 1.6 1.4 1.2 5 1.0 0 10 40 30 50 20 TEMPERATURE (˚C) 60 70 0 VTL 35 30 25 20 15 10 45 40 Supply Current vs Data Rate VCC = 5V RL = 3k CL = 2500pF 2 DRIVERS ACTIVE 0 25 50 75 100 125 DATA RATE (kBAUD) 150 175 1384fa 3 LTC1384 TYPICAL PERFOR A CE CHARACTERISTICS VCC Supply Current vs Temperature 18 16 SHORT-CIRCUIT CURRENT (mA) SUPPLY CURRENT (mA) 14 12 10 8 6 4 2 0 0 10 20 30 40 50 TEMPERATURE (°C) 60 70 1 DRIVER LOADED RL = 3k 2 DRIVERS LOADED RL = 3k 14 12 10 8 6 4 2 0 0 ISC– ISC+ SHORT-CIRCUIT CURRENT (mA) LTC1384 • TPC04 Driver Leakage in Shutdown vs Temperature 45 40 LEAKAGE CURRENT (µA) 35 30 25 20 15 10 5 0 0 10 30 20 40 50 TEMPERATURE (°C) 60 70 VOUT = 20V VOUT = – 20V LTC1384 • TPC07 4 UW Driver Short-Circuit Current vs Temperature 18 16 Receiver Short-Circuit Current vs Temperature 50 40 ISC– 30 20 ISC+ 10 10 20 30 40 50 TEMPERATURE (°C) 60 70 0 10 30 20 50 40 TEMPERATURE (°C) 60 70 LTC1384 • TPC05 LTC1384 • TPC06 Driver Output Waveforms DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k INPUT Receiver Output Waveforms RECEIVER OUTPUT CL = 51pF INPUT LTC1384 • TPC08 LTC1384 • TPC09 5µs/DIV 5µs/DIV 1384fa LTC1384 PI FU CTIO S VCC: 5V Input Supply Pin. 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 independent of the RX EN pin. The supply current of the device drops to 35µA (two receivers alive) and both driver outputs are forced into three-state. RX EN: TTL/CMOS Compatible Receiver Enable Pin. A logic high forces the receiver outputs into three-state. A logic low enables the receiver outputs. V +: Positive Supply Output (RS232 Drivers). V + ≅ 2VCC – 2V. 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 share a common capacitor. 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 – 2V). 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 2Ω. TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. The inputs of unused drivers can be left unconnected since 300k input pull-up resistors to VCC are included on chip. To minimize power consumption, the internal driver pull-up resistors are disconnected from VCC in the Shutdown mode. TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in the Shutdown 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. A logic high at RX EN puts the outputs into three-state. SWITCHI G TI E WAVEFOR S DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD LTC1384 • 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 LTC1384 • F02 0V V – Figure 2. Receiver Propagation Delay Timing 1384fa 5 LTC1384 TEST CIRCUITS Driver Timing Test Load DRIVER OUTPUT DRIVER 51pF 3k Receiver Timing Test Load RX OUTPUT RX INPUT RX 51pF DRIVER INPUT LTC1384 • TA04 LTC1384 • TA03 ESD Test Circuit 2 0.1µF 4 5 0.1µF 6 12 VCC 300k LOGIC INPUT LOGIC OUTPUT 11 13 5k 8 14 232 OUTPUT 232 INPUT RS232 LINE PINS PROTECTED TO ±10kV LTC1384 VCC 300k 15 17 3 7 0.1µF 0.1µF VCC LOGIC INPUT 232 OUTPUT LOGIC OUTPUT ON/OFF 10 18 5k 9 16 232 INPUT LTC1384 • TA04 1384fa 6 LTC1384 PACKAGE DESCRIPTIO 7.8 – 8.2 0.42 ± 0.03 RECOMMENDED SOLDER PAD LAYOUT 5.00 – 5.60** (.197 – .221) 0.09 – 0.25 (.0035 – .010) 0.55 – 0.95 (.022 – .037) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED .152mm (.006") PER SIDE **DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( 8.255 +0.889 –0.381 ) INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) NOTE: 1. DIMENSIONS ARE 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. U G Package 20-Lead Plastic SSOP (5.3mm) (Reference LTC DWG # 05-08-1640) 6.90 – 7.50* (.272 – .295 ) 1.25 ± 0.12 20 19 18 17 16 15 14 13 12 11 5.3 – 5.7 7.40 – 8.20 (.291 – .323) 0.65 BSC 1 2 3 4 5 6 7 8 9 10 2.0 (.079) 0° – 8° 0.65 (.0256) BSC 0.22 – 0.38 (.009 – .015) 0.05 (.002) G20 SSOP 0802 N Package 18-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .900* (22.860) MAX 18 17 16 15 14 13 12 11 10 .255 ± .015* (6.477 ± 0.381) 1 .130 ± .005 (3.302 ± 0.127) .020 (0.508) MIN 2 3 4 5 6 7 8 9 .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .120 (3.048) MIN .005 (0.127) MIN .018 ± .003 (0.457 ± 0.076) .100 (2.54) BSC N18 1002 1384fa 7 LTC1384 PACKAGE DESCRIPTIO .030 ±.005 TYP N .420 MIN 1 2 3 RECOMMENDED SOLDER PAD LAYOUT .291 – .299 (7.391 – 7.595) NOTE 4 .010 – .029 × 45° (0.254 – 0.737) 0° – 8° TYP .005 (0.127) RAD MIN .009 – .013 (0.229 – 0.330) NOTE: 1. DIMENSIONS IN NOTE 3 .016 – .050 (0.406 – 1.270) INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. 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 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) RELATED PARTS PART NUMBER LT1780/LT1781 LTC1382 LTC1383 LTC1385 LTC1386 DESCRIPTION 5V, 2 Driver, 2 Receiver RS232 Transeivers 5V, 2 Driver, 2 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver COMMENTS ± 15kV ESD per IEC 1000-4 220µA Supply Current, 0.2µA in Shutdown 220µA Supply Current, Narrow 16-pin SO 220µA Supply Current, 2 Receivers Active in Shutdown 220µA Supply Current, Narrow 16-pin SO 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● WWW.linear.com U SW Package 18-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) .050 BSC .045 ±.005 .447 – .463 (11.354 – 11.760) NOTE 4 18 17 16 15 14 13 12 11 10 N .325 ±.005 NOTE 3 .394 – .419 (10.007 – 10.643) N/2 N/2 1 .093 – .104 (2.362 – 2.642) 2 3 4 5 6 7 8 9 .037 – .045 (0.940 – 1.143) .050 (1.270) BSC .004 – .012 (0.102 – 0.305) .014 – .019 (0.356 – 0.482) TYP S18 (WIDE) 0502 1384fa LW/TP 1002 1K REV A • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 1994