LTC1347 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 5 Receivers Active in Shutdown U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LTC®1347 is a 3-driver/5-receiver RS232 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. Low Supply Current: 300µA Five Receivers Kept Alive in Shutdown ESD Protection Over ±10kV Operates from a Single 5V 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 RS232 I/O Lines Can Be Forced to ±25V Without Damage Pin Compatible with LT1137A and LT1237 Flowthrough Architecture In Shutdown mode, all five receivers are kept alive and the supply current is 80µA. All RS232 outputs assume a high impedance state in Shutdown and with the power off. The LTC1347 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. U APPLICATIO S ■ ■ Notebook Computers Palmtop Computers , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATIO Quiescent and Shutdown Supply Current vs Temperature 3-Drivers/5-Receivers with Shutdown VCC C2 0.1µF DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF NC 2 28 LTC1347 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 120 1200 V– C3 0.1µF C4 0.1µF DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT 100 1000 SHUTDOWN CURRENT 800 80 60 600 QUIESCENT CURRENT 400 40 SHUTDOWN CURRENT (µA) C1 0.1µF 1 QUIESCENT CURRENT (µA) V+ 20 200 DRIVER 3 IN 0 0 80 100 20 60 40 TEMPERATURE (°C) TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC. 0 –40 RX5 OUT GND NC NC –20 1347 TA02 1347 TA01 1347fa 1 LTC1347 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO Supply Voltage (VCC) ................................................ 6V 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 .................... 0°C to 70°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+ 3 26 C2– 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 LTC1347CG LTC1347CNW LTC1347CSW 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 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 = 5V, 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 Output Leakage Current Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current MIN TYP ● ● 5.0 – 5.0 Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = 5V VIN = 0V VOUT = 0V Shutdown, VOUT = ±20V (Note 3) ● ● 2.0 7.0 – 6.5 1.4 1.4 Input Low Threshold Input High Threshold VIN = ±10V Output Low, IOUT = – 1.6mA (VCC = 5V) Output High, IOUT = 160µA (VCC = 5V) Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V Positive Negative 0.8 5 –5 ● ● ±9 ±10 ±12 ±500 ● ● 0.8 ● 0.1 3 1.3 1.7 0.4 5 0.2 4.8 – 40 20 ● ● MAX 3.5 – 15 10 UNITS V V V V µA µA mA µA 2.4 1.0 7 0.4 V V V kΩ V V mA mA 1347fa 2 LTC1347 DC ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted. PARAMETER Power Supply Generator V + Output Voltage CONDITIONS MIN IOUT = 0mA IOUT = 12mA IOUT = 0mA IOUT = – 12mA Shutdown to Turn-On V – Output Voltage Supply Rise Time Power Supply VCC Supply Current TYP MAX UNITS 8.0 7.5 – 8.0 – 7.0 0.2 No Load (All Drivers VIN = 5V)(Note 2) No Load (All Drivers VIN = 0V) (Note 2) Shutdown (Note 3) 0.6 0.8 80.0 1.4 1.4 ● ● ● On/Off Threshold Low On/Off Threshold High ● 2.0 ● V V V V ms 1.1 1.3 120.0 0.8 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 otherwise noted. PARAMETER Slew Rate 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) Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 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 0.2 MAX 30 3.5 3.5 0.8 0.8 UNITS V/µs V/µs µs µs µs µs Note 3: Supply current and leakage current measurements in Shutdown are performed with VON/OFF = 0V. U W TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage Receiver Input Thresholds 10 6 OUTPUT HIGH VCC = 5V VCC = 4.5V 4 2 0 –2 OUTPUT LOW VCC = 4.5V –4 1.8 VTH 1.6 VTL 1.4 1.2 –6 –20 20 0 40 60 TEMPERATURE (°C) 80 100 1347 G01 1.0 –40 –20 35 30 25 20 15 10 5 VCC = 5V –8 –40 VCC = 5V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE 40 2.0 SUPPLY CURRENT (mA) RL = 3k THRESHOLD VOLTAGE (V) DRIVER OUTPUT VOLTAGE (V) 8 Supply Current vs Data Rate 45 2.2 0 40 20 60 0 TEMPERATURE (˚C) 80 100 1347 G02 0 25 75 100 125 50 DATA RATE (kBAUD) 150 175 1347 G03 1347fa 3 LTC1347 U W TYPICAL PERFOR A CE CHARACTERISTICS Driver Leakage in Shutdown 16 40 14 35 3 DRIVERS LOADED RL = 3k 12 10 8 1 DRIVER LOADED RL = 3k 6 4 2 18 30 25 VOUT = –20V 20 15 10 VOUT = 20V 5 0 Driver Short-Circuit Current 20 SHORT-CIRCUIT CURRENT (mA) 45 LEAKAGE CURRENT (µA) SUPPLY CURRENT (mA) VCC Supply Current 20 10 30 20 40 50 TEMPERATURE (°C) 70 60 0 10 30 20 40 50 TEMPERATURE (°C) 1347 G04 ISC– 14 ISC+ 12 10 8 6 4 0 0 16 60 70 0 –40 –20 20 0 40 60 TEMPERATURE (°C) 1347 G05 Receiver Short-Circuit Current 80 100 1347 G06 Driver Output Waveforms Receiver Output Waveforms SHORT-CIRCUIT CURRENT (mA) 60 DRIVER OUTPUT RL = 3k CL = 2500pF 50 40 RECEIVER OUTPUT CL = 51pF DRIVER OUTPUT RL = 3k ISC– INPUT 30 INPUT ISC+ 20 1347 G08 10 –40 –20 40 20 0 60 TEMPERATURE (°C) 80 1347 G09 100 1347 G07 U U U PI FU CTIO S VCC: 5V Input Supply Pin. Supply current is typically 80µA 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 all receivers kept alive, and the supply current is 80µA. All driver outputs are in high impedance state. This pin cannot float. V + : Positive Supply Output (RS232 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 be paralleled into common capacitors. 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 – 1.5V). 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 1347fa 4 LTC1347 U U U PI FU CTIO S charge pump efficiency, the capacitor’s effective series resistance should be less than 2Ω. DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/ CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. DRIVER OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in 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. All receivers are kept alive in Shutdown. 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 1347 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 1347 F02 Figure 2. Receiver Propagation Delay Timing 1347fa 5 LTC1347 TEST CIRCUITS DRIVER INPUT DRIVER OUTPUT RX OUTPUT DRIVER RX INPUT 51pF RX 3k 51pF 1347 F04 1347 F03 Figure 3. Driver Timing Test Load Figure 4. Receiver Timing Test Load V+ C1 0.1µF VCC C2 0.1µF DRIVER 1 OUT RX1 IN RS232 LINE PINS PROTECTED TO ±10kV DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF NC 1 2 28 LTC1347 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 DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND NC NC 1347 TC01 Figure 5. ESD Test Circuit 1347fa 6 LTC1347 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) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 0.05 (.002) 0.22 – 0.38 (.009 – .015) 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) 1.455* (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) .009 – .015 (0.229 – 0.381) +.035 .625 –.015 ( 15.87 +0.889 –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 .125 (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) .018 ± .003 (0.457 ± 0.076) .100 (2.54) BSC NW28 0502 1347fa 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 LTC1347 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 .291 – .299 (7.391 – 7.595) NOTE 4 .010 – .029 × 45° (0.254 – 0.737) .005 (0.127) RAD MIN 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 .009 – .013 (0.229 – 0.330) .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 LT1137A 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 1347fa 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 ● WWW.linear.com LINEAR TECHNOLOGY CORPORATION 1994