LTC1385CN

LTC1385 3.3V Low Power EIA/TIA-562 Transceiver FEATURES s s s s s s s s DESCRIPTIO s s Operates from a Single 3.3V Supply Low Supply Current: ICC = 200µA ICC = 35µA in Driver Disable Mode ICC = 0.2µA in Shutdown Mode ESD Protection Over ±10kV Uses Small Capacitors: 0.1µF Operates to 120kBaud Output Overvoltage Does Not Force Current Back into Supplies EIA/TIA-562 I/O Lines Can Be Forced to ± 25V Without Damage Pin Compatible with LT1180A The LTC®1385 is an ultra-low power, 2-driver/2-receiver EIA / TIA-562 transceiver which operates from a single 3.3V supply. The charge pump requires only four spacesaving 0.1µF capacitors. The transceiver operates in one of three modes: Normal, Driver Disable or Shutdown. In the Normal mode, ICC is only 200µA in the unloaded condition. In the Driver Disable 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. In the Shutdown mode, everything is turned off and ICC drops to 0.2µA. The LTC1385 is fully compliant with all data rate and overvoltage EIA / TIA-562 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. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S s s Notebook Computers Palmtop Computers TYPICAL APPLICATIO 2-Drivers/2-Receivers with Shutdown and Driver Disable 2 0.1µF 0.1µF LOGIC INPUT 4 5 6 VCC 12 VCC LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 11 13 10 5k 5k ON/OFF 18 1 DRIVER DISABLE LTC1385 • TA01 Quiescent and Shutdown Supply Current vs Temperature 600 1.2 1.0 SHUTDOWN CURRENT (µA) 17 LTC1385 3 7 300k 15 300k 8 14 9 VCC = 3.3V 500 QUIESCENT CURRENT (µA) 0.1µF 562 OUTPUT 0.1µF 400 300 200 100 0 –20 SHUTDOWN CURRENT 0 20 40 TEMPERATURE (°C) 60 QUIESCENT CURRENT 562 OUTPUT 562 INPUT 562 INPUT 16 TEST CONDITION: VCC = 3.3V LTC1385 • TA02 U 0.8 0.6 0.4 0.2 0 80 sn1385 1385fas U U 1 LTC1385 ABSOLUTE AXI U RATI GS Short-Circuit Duration V + ................................................................... 30 sec V – ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1385C ............................................. 0°C to 70°C LTC1385I ........................................... – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C 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 PACKAGE/ORDER I FOR ATIO TOP VIEW DRIVER DISABLE C1 + V+ C1 – 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 LTC1385CG LTC1385IG C2 + C2 – V– 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 CONDITIONS 3k to GND The q denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, Driver Disable = VCC, unless noted. MIN Positive Negative q q q q q q q Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Shutdown or Driver Disable or VCC = 0V (Note 3,4), VOUT = ± 20V 2 U U W WW U W TOP VIEW DRIVER DISABLE 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 LTC1385CN LTC1385CSW LTC1385IN LTC1385ISW TJMAX = 125°C, θJA = 85°C/W TYP 4.5 – 4.5 1.4 1.4 – 20 ±10 ± 10 MAX UNITS V V V V µA µA mA µA 3.7 – 3.7 2.0 0.8 5 – 40 ± 500 sn1385 1385fas LTC1385 DC ELECTRICAL CHARACTERISTICS PARAMETER 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 Power Supply VCC Supply Current Supply Leakage Current (VCC) Digital Input Threshold Low Digital Input Threshold High CONDITIONS Input Low Threshold Input High Threshold The q denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, Driver Disable = VCC, unless noted. MIN q q q TYP 1.3 1.7 0.4 5 0.2 3.2 – 20 7 1 5.7 5.5 – 5.3 – 5.0 0.2 MAX UNITS V V V kΩ V V mA mA µA V V V V ms 0.8 0.1 3 3.0 –5 2 – 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 = 0V Shutdown (Note 4), 0V ≤ VOUT ≤ VCC IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = – 5mA Shutdown or Driver Disable to Turn-On No Load (Note 2), 0°C to 70°C No Load (Note 2), – 40°C to 85°C Shutdown (Note 4) Driver Disable (Note 3) q q 2.4 1.0 7 0.4 q 10 q q q q q q 2.0 0.2 3.5 0.2 35 1.4 1.4 0.5 1.0 10 50 0.8 mA mA µA µA V V AC CHARACTERISTICS PARAMETER Slew Rate Driver Propagation Delay (TTL to EIA / TIA-562) Receiver Propagation Delay (EIA / TIA-562 to TTL) The q denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless 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 0.2 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 Driver Disable mode are performed with VDRIVER DISABLE = GND and VON/OFF = VCC. Note 4: Measurements made in the Shutdown mode are performed with VON/OFF = 0V. sn1385 1385fas 3 LTC1385 TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage vs Temperature 5 4 DRIVER OUTPUT VOLTAGE (V) THRESHOLD VOLTAGE (V) 3 2 1 0 –1 –2 –3 –4 –5 0 10 OUTPUT HIGH VCC = 3.3V 1.8 1.6 1.4 VTH+ ALL DRIVERS WITH LOAD RL = 3k SUPPLY CURRENT (mA) OUTPUT LOW VCC = 3.3V 40 30 20 50 TEMPERATURE (°C) VCC Supply Current vs Temperature 4.5 4.0 LEAKAGE CURRENT (µA) SUPPLY CURRENT (mA) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 10 2 DRIVERS LOADED RL = 3k SHORT-CIRCUIT CURRENT (mA) 1 DRIVER LOADED RL = 3k 20 30 50 40 TEMPERATURE (°C) LTC1385 • TPC04 Receiver Short-Circuit Current vs Temperature 45 40 SHORT-CIRCUIT CURRENT (mA) DRIVER OUTPUT RL = 3k CL = 1000pF DRIVER OUTPUT RL = 3k 35 30 25 20 15 10 5 0 0 10 30 50 40 20 TEMPERATURE (°C) 60 70 ISC+ ISC– LTC1385 • TPC06 4 UW 60 70 LTC1385 • TPC01 Receiver Input Thresholds vs Temperature 2.2 2.0 15 20 Supply Current vs Data Rate VCC = 3.3V RL = 3k CL = 2500pF ALL DRIVERS ACTIVE 10 VTH– 1.2 1.0 0 10 40 30 50 20 TEMPERATURE (˚C) 60 70 5 0 0 20 40 80 100 60 DATA RATE (kBAUD) 120 140 LTC1385 • TPC02 LTC1385 • TPC03 Driver Leakage in Shutdown vs Temperature 45 40 35 30 25 20 15 10 5 0 60 70 18 16 14 12 10 8 6 4 2 0 Driver Short-Circuit Current vs Temperature ISC– VOUT = – 20V ISC+ VOUT = 20V 0 10 30 20 40 50 TEMPERATURE (°C) 60 70 0 10 30 50 40 20 TEMPERATURE (°C) 60 70 LTC1385 • TPC05 LTC1385 • TPC06 Driver Output Waveforms Receiver Output Waveform RECEIVER OUTPUT CL = 51pF INPUT INPUT LTC1385 • TPC08 LTC1385 • TPC09 sn1385 1385fas LTC1385 PI FU CTIO S VCC: 3.3V 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 Driver Disable pin. The supply current drops to 0.2µA and all driver and receiver outputs are forced into three-state. DRIVER DISABLE: TTL/CMOS Compatible Input Pin. With the ON/OFF pin held high, a logic low forces the part into the Driver Disable mode with the charge pump turned off and the driver outputs forced into three-state. Both receivers remain active and the supply current drops to 35µA. A logic high forces the part into the Normal mode. V +: Positive Supply Output (EIA/TIA-562 Drivers). 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 share a common capacitor. For a large number of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V –: Negative Supply Output (EIA/TIA-562 Drivers). 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 2Ω. TR IN: EIA/TIA-562 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 EIA/TIA-562 Voltage Levels. Outputs are in a high impedance state when in the Shutdown or Driver Disable 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. Outputs are in a high impedance state when in the Shutdown mode. SWITCHI G TI E WAVEFOR S DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD 1385 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 1385 F02 0V V – Figure 2. Receiver Propagation Delay Timing sn1385 1385fas 5 LTC1385 TEST CIRCUITS Driver Timing Test Load Receiver Timing Test Load DRIVER INPUT DRIVER OUTPUT DRIVER 51pF 3k RX OUTPUT RX INPUT RX 51pF 1385 F04 1385 F03 ESD Test Circuit 2 0.1µF 0.1µF LOGIC INPUT 4 5 6 VCC 12 S 17 LTC1385 3 7 300k 15 VCC 300k S VCC 0.1µF 562 OUTPUT 0.1µF LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 11 13 10 8 14 5k 9 562 OUTPUT 562 INPUT 562 INPUT S RS562 LINE PINS PROTECTED TO ± 10kV S 5k ON/OFF 18 1 DRIVER DISABLE 16 1385 F05 sn1385 1385fas 6 LTC1385 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) 1.25 ± 0.12 6.90 – 7.50* (.272 – .295 ) 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 .100 (2.54) BSC .018 ± .003 (0.457 ± 0.076) N18 1002 sn1385 1385fas 7 LTC1385 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 1 .093 – .104 (2.362 – 2.642) 2 3 4 5 6 7 8 9 .037 – .045 (0.940 – 1.143) .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 LTC1327 LTC1348 LTC1382 LTC1383 LTC1384 LTC1386 DESCRIPTION 5V, 2 Driver, 2 Receiver RS232 Transceivers 3.3V, 3 Driver, 5 Receiver RS562 Transceiver 3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver COMMENTS ± 15kV ESD per IEC 1000-4 300µA Supply Current, 0.2µA in Shutdown True RS232 on 3.3V, 5 Receivers Active in Shutdown 200µA Supply Current, 0.2µA in Shutdown 200µA Supply Current, Narrow 16-Pin SO 200µA Supply Current, 2 Receivers Active in Shutdown 200µA Supply Current, Narrow 16-Pin SO 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q 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 .050 (1.270) BSC .004 – .012 (0.102 – 0.305) .014 – .019 (0.356 – 0.482) TYP S18 (WIDE) 0502 sn1385 1385fas LW/TP 1002 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994