LTC1350 3.3V Low Power EIA/TIA-562 3-Driver/ 5-Receiver Transceiver U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 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 120kBaud 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 U APPLICATIO S ■ 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 120kbaud 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. , LTC and LT are registered trademarks of Linear Technology Corporation. Notebook Computers Palmtop Computers U ■ The LTC®1350 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. TYPICAL APPLICATIO Quiescent and Shutdown Supply Current vs Temperature 3-Drivers/5-Receivers with Shutdown V– 27 C2 + 3 26 C2 – 4 C1– 5 DR1 OUT 6 RX1 IN 7 DR2 OUT 8 RX2 IN 9 RX3 IN 10 RX4 IN 11 DR3 OUT 12 RX5 IN 13 ON/OFF 14 NC 25 VCC C1 + LTC1350 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 600 500 QUIESCENT CURRENT (µA) 28 2 85 TEST CONDITION: VCC = 3.3V ALL DRIVER INPUTS TIED TO VCC 400 75 65 QUIESCENT CURRENT 300 55 200 45 100 0 –40 –20 SHUTDOWN CURRENT 40 20 60 0 TEMPERATURE (˚C) SHUTDOWN CURRENT (µA) 1 V+ 35 80 0 100 LTC1350 • TA02 LTC1350 • TA01 1350fa 1 LTC1350 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO 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 TOP VIEW V+ 1 ORDER PART NUMBER 28 V– VCC 2 27 C2+ C1+ 26 C2– 3 C1– 4 25 DR1 IN DR1 OUT 5 24 RX1 OUT RX1 IN 6 23 DR2 IN DR2 OUT 7 22 RX2 OUT RX2 IN 8 21 RX3 OUT RX3 IN 9 20 RX4 OUT RX4 IN 10 19 DR3 IN DR3 OUT 11 LTC1350CG LTC1350CNW LTC1350CSW LTC1350IG LTC1350INW LTC1350ISW 18 RX5 OUT RX5 IN 12 17 GND ON/OFF 13 16 NC NC 14 15 NC G PACKAGE 28-LEAD SSOP NW PACKAGE 28-LEAD PDIP SW PACKAGE 28-LEAD PLASTIC SO WIDE TJMAX = 125°C, θJA = 96°C/W (G) TJMAX = 125°C, θJA = 56°C/W (NW) TJMAX = 125°C, θJA = 85°C/W (SW) 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 noted. PARAMETER Any Driver Output Voltage Swing CONDITIONS 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 MIN TYP ● ● 3.7 – 3.7 Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Shutdown (Note 3), VOUT = ±20V ● ● 2.0 4.5 – 4.5 1.4 1.4 Input Low Threshold Input High Threshold ● ● 0.8 ● 0.1 3 3k to GND 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 Positive Negative ±9 ● 0.8 5 –5 ● ● ● ● MAX 3.0 –3 ±10 10 1.3 1.7 0.4 5 0.2 3.2 – 20 1 500 2.4 1 7 0.4 10 UNITS V V V V µA µA mA µA V V V kΩ V V mA µA 1350fa 2 LTC1350 DC ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless noted. PARAMETER Power Supply Generator V + Output Voltage V – Output Voltage Supply Rise Time Power Supply VCC Supply Current CONDITIONS MIN IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = – 5mA Shutdown to Turn-On MAX UNITS 5.7 5.5 – 5.3 – 5.0 0.2 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) 0°C ≤ TA ≤ 85°C No Load (All Drivers VIN = VCC)(Note 2) – 40°C ≤ TA ≤ 0°C No Load (All Drivers VIN = 0)(Note 2) – 40°C ≤ TA ≤ 85°C Shutdown (Note 3) ON/OFF Threshold Low ON/OFF Threshold High TYP ● ● ● ● ● ● ● ● 2.0 0.3 0.5 0.3 0.3 0.5 35 1.4 1.4 V V V V ms 0.6 1.0 1.0 1.5 1.5 50 0.8 mA mA mA mA mA µA V V AC CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted. PARAMETER Slew Rate Driver Propagation Delay (TTL to EIA/TIA-562) Receiver Propagation Delay (EIA/TIA-562 to TTL) 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) 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. 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 3: Supply current measurement in Shutdown mode is performed with VON/OFF = 0V. 1350fa 3 LTC1350 U W TYPICAL PERFOR A CE CHARACTERISTICS Receiver Input Thresholds vs Temperature Driver Output Voltage vs Temperature 5 VCC = 3.3V OUTPUT HIGH 1 ALL DRIVERS WITH LOAD, RL = 3k –1 –2 VCC = 3.3V OUTPUT LOW –4 –5 –40 –20 40 20 0 60 TEMPERATURE (°C) 1.8 VTH+ 1.6 VTH– 1.4 1.2 80 80 45 4.5 40 SUPPLY CURRENT (mA) LEAKAGE CURRENT (µA) RL = 3k 3 DRIVERS LOADED 3.5 3.0 2.5 RL = 3k 1 DRIVER LOADED 25 15 5 100 VOUT = –20V 20 0.5 80 VOUT = 20V 0 10 30 20 40 50 TEMPERATURE (°C) SHORT-CIRCUIT CURRENT (mA) 60 70 12 8 ISC+ 6 4 0 –40 –20 0 40 60 20 TEMPERATURE (˚C) 80 100 LTC1350 • TPC06 RECEIVER OUTPUT CL = 50pF 30 DRIVER OUTPUT RL = 3k ISC– ISC– 10 Receiver Output Waveform DRIVER OUTPUT RL = 3k CL = 1000pF 20 140 14 Driver Output Waveforms 25 120 LTC1350 • TPC03 LTC1350 • TPC05 Receiver Short-Circuit Current vs Temperature 35 80 100 60 40 DATA RATE (k Baud) 2 0 LTC1350 • TPC04 40 20 16 30 10 40 20 0 60 TEMPERATURE (°C) 0 Driver Short-Circuit Current vs Temperature 35 1.0 0 –40 –20 100 Driver Leakage in Shutdown vs Temperature 5.0 1.5 10 LT1350 • TPC02 VCC Supply Current vs Temperature 2.0 15 0 40 20 60 0 TEMPERATURE (˚C) LTC1350 • TPC01 4.0 20 5 1.0 –40 –20 100 VCC = 3.3V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE 25 SUPPLY CURRENT (mA) 2.0 2 –3 30 SHORT-CIRCUIT CURRENT (mA) 3 THRESHOLD VOLTAGE (V) DRIVER OUTPUT VOLTAGE (V) 4 0 Supply Current vs Data Rate 2.2 INPUT 15 INPUT 10 ISC+ 5 0 –40 –20 0 40 60 20 TEMPERATURE (˚C) LTC1350 • TPC08 80 LTC1350 • TPC09 100 LTC1350 • TPC07 1350fa 4 LTC1350 U U U 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 +: V+ Positive Supply Output. ≅ 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. U W W SWITCHI G TI E WAVEFOR S VCC DR INPUT 1.4V 1.4V 0V V+ DR OUTPUT 0V 0V t LHD V– t HLD LTC1350 • 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 LTC1350 • F02 Figure 2. Receiver Propagation Delay Timing 1350fa 5 LTC1350 TEST CIRCUITS Driver Timing Test Load DRIVER INPUT Receiver Timing Test Load DRIVER OUTPUT RX OUTPUT RX INPUT DRIVER 51pF RX 51pF 3k LTC1350 • TA04 LTC1350 • TA03 ESD Test Circuit V+ C1 0.1µF VCC 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 1 2 28 LTC1350 V– 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 C4 0.1µF DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT GND NC NC LTC1350 • TC01 1350fa 6 LTC1350 U PACKAGE DESCRIPTIO G Package 28-Lead Plastic SSOP (5.3mm) (Reference LTC DWG # 05-08-1640) 9.90 – 10.50* (.390 – .413) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1.25 ±0.12 7.8 – 8.2 5.3 – 5.7 0.42 ±0.03 7.40 – 8.20 (.291 – .323) 0.65 BSC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 RECOMMENDED SOLDER PAD LAYOUT 5.00 – 5.60** (.197 – .221) 2.0 (.079) 0° – 8° 0.09 – 0.25 (.0035 – .010) 0.65 (.0256) BSC 0.55 – 0.95 (.022 – .037) 0.05 (.002) 0.22 – 0.38 (.009 – .015) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) G28 SSOP 0802 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 NW Package 28-Lead PDIP (Wide .600 Inch) (Reference LTC DWG # 05-08-1520) 1.467* (36.957) MAX 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 .505 – .560* (12.827 – 14.224) .600 – .625 (15.240 – 15.875) .008 – .015 (0.203 – 0.381) +.035 .625 –.015 ( +0.889 15.87 –0.381 NOTE: 1. DIMENSIONS ARE ) .045 – .065 (1.143 – 1.651) .150 ± .005 (3.810 ± 0.127) .015 (0.381) MIN .070 (1.778) TYP .120 (3.175) MIN INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) .035 – .080 (0.889 – 2.032) .100 (2.54) BSC .018 ± .003 (0.457 ± 0.076) NW28 1002 1350fa 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 PACKAGE DESCRIPTIO SW Package 28-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) .050 BSC .045 ±.005 .030 ±.005 TYP .697 – .712 (17.70 – 18.08) NOTE 4 N 28 27 26 25 24 23 22 21 20 19 18 17 16 15 N .325 ±.005 .420 MIN .394 – .419 (10.007 – 10.643) NOTE 3 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .005 (0.127) RAD MIN .009 – .013 (0.229 – 0.330) .291 – .299 (7.391 – 7.595) NOTE 4 .010 – .029 × 45° (0.254 – 0.737) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 .037 – .045 (0.940 – 1.143) .093 – .104 (2.362 – 2.642) 0° – 8° TYP .050 (1.270) BSC NOTE 3 .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .004 – .012 (0.102 – 0.305) .014 – .019 (0.356 – 0.482) TYP 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) S28 (WIDE) 0502 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT 1137A 5V, 3 Driver, 5 Receiver RS232 Transceiver ±15kV ESD per IEC 1000-4 LTC1327 3.3V, 3 Driver, 5 Receiver RS562 Transceiver 300µA Supply Current, 0.2µA in Shutdown LTC1337 5V, 3 Driver, 5 Receiver RS232 Transceiver 300µA Supply Current, 1µA in Shutdown LTC1348 3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver True RS232 on 3.3V, 5 Receivers Active in Shutdown LTC1385 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 200µA Supply Current, 2 Receivers Active in Shutdown LTC1386 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 200µA Supply Current, Narrow 16-Pin SO LTC2844 3.3V, Software-Selectable Multiprotocol Transceiver 4 Drivers, 4 Receivers for Control Signals Including LL LTC2845 3.3V, Software-Selectable Multiprotocol Transceiver 5 Drivers, 5 Receivers for Control Signals Including LL, RL and TM LTC2846 3.3V, Software-Selectable Multiprotocol Transceiver 4 Drivers, 4 Receivers with Termination for Data/Clock ® 1350fa 8 Linear Technology Corporation LW/TP 0103 1K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● WWW.linear.com LINEAR TECHNOLOGY CORPORATION 1993