LTC1337 5V Low Power RS232 3-Driver/5-Receiver Transceiver U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Low Supply Current: 300µA ESD Protection: Over ±10kV 1µA Supply Current in Shutdown Operates from a Single 5V Supply Uses Small Capacitors: 0.1µF Operates to 120k Baud 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 LT ®1137A and LT1237 Flowthrough Architecture U APPLICATIO S ■ In Shutdown mode, the supply current is further reduced to 1µA. All RS232 outputs assume a high impedance state in Shutdown and with the power off. The LTC1337 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud 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. Notebook Computers Palmtop Computers U ■ The LTC®1337 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 and can supply up to 12mA of extra current to power external circuitry. TYPICAL APPLICATIO V+ 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 2 28 LTC1337 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 600 1.2 500 1.0 400 GND 0.6 300 0.4 200 SHUTDOWN CURRENT 100 0 RX5 OUT 0.8 QUIESCENT CURRENT –20 0 20 40 60 TEMPERATURE (°C) SHUTDOWN CURRENT (µA) C1 0.1µF 1 Supply Current QUIESCENT CURRENT OPERATING (µA) 3-Drivers/5-Receivers with Shutdown 0.2 80 0 TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC 1337 TA01 1337 TA02 1337fa 1 LTC1337 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW 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 Commercial (LTC1337C) ........................ 0°C to 70°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C 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 LTC1337CG LTC1337CNW LTC1337CSW 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 18 RX5 OUT RX5 IN 12 17 GND ON/OFF 13 16 NC NC 14 15 NC G PACKAGE NW PACKAGE 28-LEAD PLASTIC SSOP 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 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 Output Short-Circuit Current Output Leakage Current CONDITIONS RL = 3k to GND RL = 3k to GND Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = 5V VIN = 0 VOUT = 0V Shutdown, VOUT = ±20V (Note 3) Input Low Threshold Input High Threshold – 10V ≤ VIN ≤ 10V Output Low, IOUT = – 1.6mA (VCC = 5V) Output High, IOUT = 160µA (VCC = 5V) Sourcing Current, VOUT = 0 Sinking Current, VOUT = VCC Shutdown, 0 ≤ VOUT ≤ VCC (Note 3) Positive Negative MIN TYP ● ● 5.0 – 5.0 ● ● 2.0 7.0 – 6.5 1.4 1.4 ±10 10 ● ● ● 0.8 ● 0.1 3 ● 0.8 5 –5 ● ● ● ● MAX 3.5 15 – 15 1.3 1.7 0.4 5 0.2 4.8 20 – 40 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 mA µA 1337fa 2 LTC1337 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 Supply Leakage Current (VCC) On/Off Threshold Low On/Off Threshold High TYP MAX UNITS 8.0 7.5 – 8.0 – 6.5 0.2 No Load (Note 2) Shutdown (Note 3) ● ● ● 2.0 ● 0.3 1 1.4 1.4 V V V V ms 0.5 10 0.8 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 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 and driver inputs tied high. TYP 8 4 2 2 0.3 0.2 MAX 30 UNITS V/µs V/µs µs µs µs µs 3 3 0.6 0.6 Note 3: Supply current and leakage measurements in Shutdown are performed with VON = 0V. U W TYPICAL PERFOR A CE CHARACTERISTICS Driver Output Voltage Receiver Input Thresholds RL = 3k OUTPUT HIGH VCC = 5V 6 THRESHOLD VOLTAGE (V) DRIVER OUTPUT VOLTAGE (V) 8 VCC = 4.5V 4 2 0 –2 OUTPUT LOW –4 VCC = 4.5V –6 Supply Current vs Data Rate 2.0 45 1.9 40 1.8 INPUT HIGH SUPPLY CURRENT (mA) 10 1.7 1.6 1.5 INPUT LOW 1.4 1.3 1.2 VCC = 5V –8 0 10 30 20 40 50 TEMPERATURE (°C) 70 1337 G01 35 30 25 20 15 10 5 1.1 60 VCC = 5V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE 0 0 10 30 20 40 50 TEMPERATURE (°C) 60 70 1337 G02 0 25 75 100 125 50 DATA RATE (k BAUD) 150 175 1337 G03 1337fa 3 LTC1337 U W TYPICAL PERFOR A CE CHARACTERISTICS Driver Leakage in Shutdown Driver Short-Circuit Current 20 16 40 18 14 35 3 DRIVERS LOADED RL = 3k 12 10 8 1 DRIVER LOADED RL = 3k 6 4 2 30 25 VOUT = –20V 20 15 10 VOUT = 20V 5 0 SHORT-CIRCUIT CURRENT (mA) 45 LEAKAGE CURRENT (µA) SUPPLY CURRENT (mA) VCC Supply Current 20 10 30 20 40 50 TEMPERATURE (°C) 60 70 14 12 ISC– 10 ISC+ 8 6 4 0 0 16 2 0 10 30 20 40 50 TEMPERATURE (°C) 1337 G04 60 70 0 10 30 20 40 50 TEMPERATURE (°C) 1337 G05 70 1337 G06 Driver Output Waveforms Receiver Short-Circuit Current 60 Receiver Output Waveforms 55 DRIVER OUTPUT RL = 3k CL = 2500pF SHORT-CIRCUIT CURRENT (mA) 50 45 ISC– 40 DRIVER OUTPUT RL = 3k 35 RX OUTPUT CL = 50pF INPUT 30 INPUT ISC+ 25 20 15 10 0 10 30 20 40 50 TEMPERATURE (°C) 60 70 1337 G07 U U U PI FU CTIO S VCC: 5V Input Supply Pin. Supply current less than 1µA 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 which reduces input supply current to less than 1µA and places all drivers and receivers 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 5V. 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 charge pump efficiency, the capacitor’s effective series resistance should be less than 50Ω. 1337fa 4 LTC1337 U U U PI FU CTIO S 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. Outputs are in a high impedance state when in Shutdown mode to allow data line sharing. U W W SWITCHI G TI E WAVEFOR S DRIVER INPUT VCC 1.4V 1.4V 0V V+ DRIVER OUTPUT 0V 0V t LHD V– VCC 1.7V RX IN 1.3V 0V VCC RX OUTPUT 0V 0.8V t LHR t HLD t HLR 1337 F01 0V 1337 F02 Figure 1. Driver Propagation Delay Timing Figure 2. Receiver Propagation Delay Timing TEST CIRCUITS DRIVER INPUT DRIVER OUTPUT ESD Test Circuit DRIVER 51pF 3k V+ C1 0.1µF 1337 F03 VCC C2 0.1µF Figure 3. Driver Timing Test Load DRIVER 1 OUT RX1 IN RS232 LINE PINS PROTECTED TO ±10kV RX OUTPUT RX IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN RX DRIVER 3 OUT 51pF RX5 IN ON/OFF 1 2 28 LTC1337 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 1337 F04 1337 TC01 Figure 4. Receiver Timing Test Load 1337fa 5 LTC1337 U TYPICAL APPLICATIO S Operation Using 5V and 12V Power Supplies + 12V V + 0.01µF 0.01µF 1 C1+ 3 26 C1– 4 25 5 24 6 23 7 22 8 21 DRIVER OUT RX IN DRIVER OUT RX IN TO LINE RX IN RX IN DRIVER OUT RX IN ON/0FF = 5V 2 V– 28 LTC1337 27 9 20 10 19 11 18 12 17 13 16 14 15 C2 + 0.1µF C2 – DRIVER IN + 5V VCC V+ VCC 0.1µF RX OUT DRIVER IN RX OUT TO LOGIC RX OUT RX OUT DRIVER IN RX OUT GND 1337 TA03 Typical Mouse Driving Application 0.1µF MOUSE + 5V VCC 2 C1+ OPTICS DRIVER OUT 5 24 RX OUT DCD RX IN 6 23 DRIVER IN DSR DRIVER OUT 7 22 RX OUT RX RX IN 8 21 RX OUT RTS RX IN 9 20 RX OUT DTR (9) DB9 RI 0.1µF RX IN 10 DRIVER OUT 11 RX IN 12 0.1µF 0.1µF 25 DRIVER IN CTS (5) C2 + 27 4 TX V– V– 26 C1– (1) 28 LTC1337 3 V+ LOGIC 1 19 DRIVER IN C2 + V+ – LOGIC “0” LOGIC “0” MOUSE DATA LOGIC “1” 18 RX OUT 17 GND ON/OFF 13 16 14 15 1337 TA04 1337fa 6 LTC1337 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) 1.467* (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 ( 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 .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 1337fa 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 LTC1337 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) NOTE 3 .050 (1.270) BSC .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 LTC1348 3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver True RS232 on 3.3V, 5 Receivers Active in Shutdown 1337fa 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