LTC1386 3.3V Low Power EIA/TIA562 Transceiver U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LTC®1386 is an ultra-low power 2-driver/2-receiver EIA/TIA562 transceiver that operates from a single 3.3V supply. The charge pump requires only four space-saving 0.1µF capacitors. The supply current (ICC) of the transceiver is only 200µA with driver outputs unloaded. Operates from a Single 3.3V Supply Low Supply Current: ICC = 200µA ESD Protection Over ±10kV Available in 16-Pin SOIC Narrow Package Uses Small Capacitors: 0.1µF Operates to 120kBaud Output Overvoltage Does Not Force Current Back into Supplies EIA/TIA562 I/O Lines Can Be Forced to ±25V Without Damage Pin Compatible with LT1181A The LTC1386 is fully compliant with all data rate and overvoltage EIA/TIA562 specifications. The transceiver can operate up to 120kbaud with a 1000pF, 3kΩ load. Both driver outputs and receiver inputs can be forced to ±25V without damage and can survive multiple ±10kV ESD strikes. U APPLICATIO S ■ Notebook Computers Palmtop Computers , LTC and LT are registered trademarks of Linear Technology Corporation. U ■ TYPICAL APPLICATIO Quiescent Supply Current vs Temperature 16 3 2 4 0.1µF LOGIC INPUT 5 LTC1386 600 500 0.1µF 6 0.1µF VCC 300k 11 14 562 OUTPUT VCC 300k LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 10 7 12 13 5k 5k 562 OUTPUT 400 QUIESCENT CURRENT 300 200 100 562 INPUT 0 –20 8 9 TEST CONDITION: VCC = 3.3V VCC = 3.3V QUIESCENT CURRENT (µA) 0.1µF 1 562 INPUT 0 20 40 TEMPERATURE (°C) 60 80 LTC1386 • TA02 15 LTC1386 • TA01 1386fa 1 LTC1386 W W W AXI U U ABSOLUTE RATI GS Supply Voltage (VCC) ................................................ 5V 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 Short-Circuit Duration V + ................................................................... 30 sec V – ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1386C ............................................... 0°C to 70°C LTC1386I ............................................ – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C U U W PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW C1+ 1 16 VCC + 2 15 GND C1– 3 14 TR1 OUT C2+ 4 13 RX1 IN C2 – 5 12 RX1 OUT – 6 11 TR1 IN TR2 OUT 7 10 TR2 IN RX2 IN 8 9 V V LTC1386CS LTC1386IS RX2 OUT S PACKAGE 16-LEAD PLASTIC SO TJMAX = 125°C, θJA = 95°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. DC ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. PARAMETER CONDITIONS Any Driver Output Voltage Swing 3k to GND Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Power Supply Generator V + Output Voltage V – Output Voltage Power Supply VCC Supply Current MIN TYP ● ● 3.7 – 3.7 Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V ● ● 2.0 4.5 – 4.5 1.4 1.4 Input Low Threshold Input High Threshold ● ● 0.8 ● 0.1 3 – 10V ≤ VIN ≤ 10V Output Low, IOUT = – 1.6mA (VCC = 3.3V) Output High, IOUT = 160µA (VCC = 3.3V) Sinking Current, VOUT = VCC Sourcing Current, VOUT = GND Positive Negative ● ● ±9 ● ● IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = – 5mA No Load (Note 2), 0°C to 70°C No Load (Note 2), – 40°C to 85°C 3.0 –5 2 – 20 ±10 1.3 1.7 0.4 5 0.2 3.2 – 20 7 MAX 0.8 5 – 40 2.4 1 7 0.4 5.7 5.5 – 5.3 – 5.0 ● ● 0.2 0.35 UNITS V V V V µA µA mA V V V kΩ V V mA mA V V V V 0.5 1.0 mA mA 1386fa 2 LTC1386 AC CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. PARAMETER Slew Rate 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) Driver Propagation Delay (TTL to EIA/TIA562) Receiver Propagation Delay (EIA/TIA562 to TTL ) MIN 3 ● ● ● ● 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. TYP 8 5 2 2 0.3 0.3 MAX 30 UNITS V/µs V/µs µs µs µs µs 3.5 3.5 0.8 0.8 Note 3: Measurements made in the shutdown mode are performed with VON/OFF=OV. U W TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage vs Temperature Receiver Input Thresholds vs Temperature 5 OUTPUT HIGH VCC = 3.3V 2 1 ALL DRIVERS WITH LOAD RL = 3k 0 –1 –2 OUTPUT LOW VCC = 3.3V –3 –4 10 40 30 20 50 TEMPERATURE (°C) 1.8 VTH+ 1.6 1.4 VTH– 60 70 0 10 40 50 30 20 TEMPERATURE (˚C) 60 70 2 DRIVERS LOADED RL = 3k 40 80 100 60 DATA RATE (kBAUD) 120 140 LTC1386 • TPC03 RECEIVER OUTPUT CL = 51pF DRIVER OUTPUT RL = 3k 2.5 20 Receiver Output Waveforms DRIVER OUTPUT RL = 3k CL = 1000pF 4.0 1 DRIVER LOADED RL = 3k 1.5 0 Driver Output Waveforms 4.5 2.0 5 LTC1386 • TPC02 VCC Supply Current vs Temperature 3.0 10 0 1.0 LTC1386 • TPC01 3.5 15 1.2 –5 0 VCC = 3.3V RL = 3k CL = 2500pF ALL DRIVERS ACTIVE 2.0 SUPPLY CURRENT (mA) 3 THRESHOLD VOLTAGE (V) DRIVER OUTPUT VOLTAGE (V) 4 SUPPLY CURRENT (mA) Supply Current vs Data Rate 20 2.2 INPUT INPUT 1.0 LTC1386 • TPC05 0.5 5µs/DIV LTC1386 • TPC06 5µs/DIV 0 0 10 20 30 40 50 TEMPERATURE (°C) 60 70 LTC1386 • TPC04 1386fa 3 LTC1386 U U U PI FU CTIO S VCC: 3.3V Input Supply Pin. This pin should be decoupled with a 0.1µF ceramic capacitor. charge pump efficiency, the capacitor’s effective series resistance should be less than 2Ω. GND: Ground Pin. TR IN: EIA/TIA562 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. V +: V+ Positive Supply Output (EIA/TIA562 Drivers). ≅ 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 share a common capacitor. For large numbers of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. TR OUT: Driver Outputs at EIA/TIA562 Voltage Levels. The driver outputs are protected against ESD to ±10kV for human body model discharges. V –: Negative Supply Output (RS232 Drivers). V – ≅ – (2VCC – 1.3V). This pin requires an external capacitor C = 0.1µF for charge storage. 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. 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 RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels. U W W SWITCHI G TI E WAVEFOR S VCC DRIVER INPUT 1.4V 1.4V 0V V+ DRIVER OUTPUT 0V 0V t LHD V– t HLD LTC1386 • F01 Figure 1. Driver Propagation Delay Timing VCC 1.7V RX INPUT RX OUTPUT 1.3V 0V 2.4V 0.8V t LHR t HLR VCC 0V LTC1386 • F02 Figure 2. Receiver Propagation Delay Timing 1386fa 4 LTC1386 TEST CIRCUITS Receiver Timing Test Load Driver Timing Test Load DRIVER INPUT RX OUTPUT DRIVER OUTPUT RX INPUT DRIVER 51pF RX 51pF 3k LTC1386 • TA04 LTC1386 • TA03 ESD Test Circuit 16 1 0.1µF LTC1386 3 LOGIC INPUT 5 VCC LOGIC OUTPUT LOGIC OUTPUT 0.1µF 300k 14 11 VCC LOGIC INPUT 0.1µF 562 OUTPUT 300k 10 7 12 13 9 VCC 6 4 0.1µF 2 5k 5k 8 562 OUTPUT 562 INPUT RS562 LINE PINS PROTECTED TO ±10kV 562 INPUT 15 1386 TA05 1386fa 5 LTC1386 U TYPICAL APPLICATIO S Paralleling Power Supply Generator with Common Storage Capacitors 0.1µF 1 16 3 2 4 0.1µF LOGIC INPUT 5 LTC1386 VCC = 3.3V 0.1µF 6 0.1µF VCC 300k 14 11 0.1µF 562 OUTPUT 1 16 3 2 4 0.1µF LOGIC INPUT 5 LOGIC OUTPUT LOGIC OUTPUT 6 VCC 300k 11 VCC 300k LOGIC INPUT LTC1386 VCC = 3.3V 562 OUTPUT VCC 300k 10 7 12 13 5k 8 9 5k 15 562 OUTPUT LOGIC INPUT 562 INPUT LOGIC OUTPUT 562 INPUT LOGIC OUTPUT 10 7 12 13 5k 9 5k 562 OUTPUT 562 INPUT 562 INPUT 15 LTC1386 • TA06 1386fa 6 LTC1386 U PACKAGE DESCRIPTIO S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 15 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) 2 3 4 5 6 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.483) TYP 8 .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) 7 .050 (1.270) BSC S16 0502 INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 1386fa 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 LTC1386 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1780/LT1781 5V, 2 Driver, 2 Receiver RS232 Transeivers ±15kV ESD per IEC 1000-4 LTC1327 3.3V, 3 Driver, 5 Receiver RS562 Transceiver 300µA Supply Current, 0.2µA in Shutdown LTC1348 3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver True RS232 on 3.3V, 5 Receivers Active in Shutdown LTC1382 5V, 2 Driver, 2 Receiver RS232 Transceiver 220µA Supply Current, 0.2µA in Shutdown LTC1383 5V, 2 Driver, 2 Receiver RS232 Transceiver 220µA Supply Current, Narrow 16-pin SO LTC1384 5V, 2 Driver, 2 Receiver RS232 Transceiver 220µA Supply Current, 2 Receivers Active in Shutdown LTC1385 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 220µA Supply Current, 2 Receivers Active in Shutdown 1386fa 8 Linear Technology Corporation LW/TP 1002 1K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● linear.com LINEAR TECHNOLOGY CORPORATION 1994