LTC1382 5V Low Power RS232 Transceiver with Shutdown FEATURES DESCRIPTIOU ■ Operates from a Single 5V Supply The LTC®1382 is an ultra-low power 2-driver/2-receiver ■ Low Supply Current: I = 220µA RS232 transceiver that operates from a single 5V CC ■ I = 0.2µA in Shutdown Mode supply. The charge pump requires only four space- CC ■ ESD Protection Over ±10kV saving 0.1µF capacitors. ■ Uses Small Capacitors: 0.1µF The transceiver operates in one of two modes, Normal ■ Operates to 120kBaud and Shutdown. In the Normal mode, I is only 220µA CC ■ Output Overvoltage Does Not Force Current with the driver outputs unloaded. In the Shutdown Back into Supplies mode, the charge pump is turned off, the driver outputs ■ RS232 I/O Lines Can Be Forced to ±25V are forced into three-state, both receivers are off and Without Damage I drops to 0.2µA. CC ■ Pin Compatible with LT1180A The LTC1382 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can APPLICATIOU S operate up to 120kbaud with a 2500pF, 3kΩ load. Both driver outputs and receiver inputs can be forced to ■ Notebook Computers ■ Palmtop Computers ±25V without damage and can survive multiple ±10kV ESD strikes. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIOU 2-Drivers/2-Receivers with Shutdown Quiescent and Shutdown Supply Current vs Temperature 2 17 0.1µF 4 3 VCC = 5V 600 1.2 TEST CONDITION: VCC = 5V 5 LTC1382 7 0.1µF 500 1.0 0.1µF 6 VCC300k 0.1µF T (A)µ400 0.8 SHUTD N O LOGIC INPUT 12 VCC300k 15 232 OUTPUT NT CURRE 300 QUCIUERSRCEENNTT 0.6 WN CURR E E 11 8 SC 200 0.4 NT LOGIC INPUT 13 14 232 OUTPUT QUIE SHCUUTRDROEWNNT µ (A) LOGIC OUTPUT 232 INPUT 100 0.2 5k 0 0 10 9 –20 0 20 40 60 80 LOGIC OUTPUT 232 INPUT 5k TEMPERATURE (°C) 18 16 ON/OFF LTC1382 • TA02 LTC1382 • TA01 1382fa 1

LTC1382 ABSOLUTE W AXIW UW RATIU GS PACKAGE/ORDER IU FORW ATIOU Supply Voltage (V )................................................ 6V CC ORDER PART Input Voltage TOP VIEW NUMBER Driver ....................................... –0.3V to V + 0.3V CC NC 1 18 ON/OFF Receiver ............................................... –25V to 25V C1+ 2 17 VCC LTC1382CN Digital Input............................... –0.3V to VCC + 0.3V V+ 3 16 GND LTC1382CSW Output Voltage C1– 4 15 TR1 OUT LTC1382IN Driver .................................................... –25V to 25V C2+ 5 14 RX1 IN LTC1382ISW Receiver .................................... –0.3V to V + 0.3V C2– 6 13 RX1 OUT CC Short-Circuit Duration V– 7 12 TR1 IN V+................................................................... 30 sec TR2 OUT 8 11 TR2 IN V–................................................................... 30 sec RX2 IN 9 10 RX2 OUT Driver Output.............................................. Indefinite N PACKAGE SW PACKAGE 18-LEAD PDIP 18-LEAD PLASTIC SO Receiver Output.......................................... Indefinite Operating Temperature Range TJMAX = 125°C, θJA = 65°C/W (N) LTC1382C ...............................................0°C to 70°C TJMAX = 125°C, θJA = 85°C/W (S) LTC1382I............................................–40°C to 85°C Storage Temperature Range................ –65°C to 150°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Lead Temperature (Soldering, 10 sec)................. 300°C DC ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Any Driver Output Voltage Swing 3k to GND Positive ● 5.0 7.0 V Negative ● –5.0 –6.5 V Logic Input Voltage Level Input Low Level (V = High) ● 1.4 0.8 V OUT Input High Level (V = Low) ● 2.0 1.4 V OUT Logic Input Current VIN = VCC ● 5 µA VIN = 0V ● –20 –40 µA Output Short-Circuit Current VOUT = 0V ±9 ±12 mA Output Leakage Current Shutdown or VCC = 0V (Note 3), VOUT = ±10V ● ±10 ±500 µA Any Receiver Input Voltage Thresholds Input Low Threshold ● 0.8 1.3 V Input High Threshold ● 1.7 2.4 V Hysteresis ● 0.1 0.4 1 V Input Resistance –10V ≤ VIN ≤ 10V 3 5 7 kΩ Output Voltage Output Low, I = –1.6mA (V = 5V) ● 0.2 0.4 V OUT CC Output High, IOUT = 160µA (VCC = 5V) ● 3.0 3.2 V Output Short-Circuit Current Sinking Current, V = V –15 –40 mA OUT CC Sourcing Current V = 0V 10 20 mA OUT Output Leakage Current Shutdown (Note 3), 0V ≤ VOUT ≤ VCC ● 1 10 µA 1382fa 2

LTC1382 DC ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply Generator V+ Output Voltage I = 0mA 8.0 V OUT I = 8mA 7.5 V OUT V– Output Voltage I = 0mA –8.0 V OUT I = –8mA –7.0 V OUT Supply Rise Time Shutdown to Turn-On 0.2 ms Power Supply VCC Supply Current No Load (Note 2), 0°C to 70°C ● 0.22 0.5 mA No Load (Note 2), –40°C to 85°C ● 0.35 1.0 mA Supply Leakage Current (VCC) Shutdown (Note 3) ● 0.2 10 µA Digital Input Threshold Low ● 1.4 0.8 V Digital Input Threshold High ● 2.0 1.4 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 CONDITIONS MIN TYP MAX UNITS Slew Rate RL = 3k, CL = 51pF 8 30 V/µs RL = 3k, CL = 2500pF 3 5 V/µs Driver Propagation Delay tHLD (Figure 1) ● 2 3.5 µs (TTL to RS232) tLHD (Figure 1) ● 2 3.5 µs Receiver Propagation Delay tHLR (Figure 2) ● 0.3 0.8 µs (RS232 to TTL) tLHR (Figure 2) ● 0.3 0.8 µs Note 1: Absolute Maximum Ratings are those values beyond which the life Note 3: Measurements made in the Shutdown mode are performed of the device may be impaired. with V = 0V. ON/OFF Note 2: Supply current is measured with driver and receiver outputs unloaded. TYPICAL PERFORW AU CE CHARACTERISTICS Driver Output Voltage Receiver Input Thresholds vs Temperature vs Temperature Supply Current vs Data Rate 10 2.2 45 RL = 3k OUTPUT HIGH VCC = 5V 8 VCC = 5V 40 RL = 3k DRIVER OUTPUT VOLTAGE (V) ––402462 OUVVTCCPCCU T== L44O..55WVV THRESHOLD VOLTAGE (V) 21111.....04628 VVTTHL SUPPLY CURRENT (mA) 122133505005 C2 LD =R I2V5E0R0Sp FACTIVE –6 5 VCC = 5V –8 1.0 0 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 0 25 50 75 100 125 150 175 TEMPERATURE (°C) TEMPERATURE (˚C) DATA RATE (kBAUD) LTC1382 • TPC01 LTC1382 • TPC02 LTC1382 • TPC03 1382fa 3

LTC1382 TYPICAL PERFORW AU CE CHARACTERISTICS V Supply Current Driver Short-Circuit Current Receiver Short-Circuit Current CC vs Temperature vs Temperature vs Temperature 18 18 16 16 50 SUPPLY CURRENT (mA) 111680424 21 D DRRIVIVRREELLRR ==S L 33LOkkOAADDEEDD SHORT-CIRCUIT CURRENT (mA) 111680424 IISSCC–+ SHORT-CIRCUIT CURRENT (mA) 324000 ISC+ ISC– 2 2 0 0 10 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) LTC1382 • TPC04 LTC1382 • TPC05 LTC1382 • TPC06 Driver Leakage in Shutdown vs Temperature Driver Output Waveforms Receiver Output Waveforms 45 DRIVER 40 OUTPUT 35 RL = 3k RECEIVER A) CL = 2500pF OUTPUT T (µ 30 DRIVER CL = 51pF URREN 25 VOUT = –20V ORULT =P U3Tk C 20 INPUT E G KA 15 INPUT A E L 10 5 VOUT = 20V LTC1382 • TPC08 LTC1382 • TPC09 0 0 10 20 30 40 50 60 70 TEMPERATURE (°C) LTC1349 • TPC05 1382fa 4

LTC1382 PIU FUU CTIOU S V : 5V Input Supply Pin. This pin should be decoupled charge pump efficiency, the capacitor’s effective series CC with a 0.1µF ceramic capacitor. resistance should be less than 2Ω. GND: Ground Pin. TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. The inputs of unused drivers can be left ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic unconnected since 300k input pull-up resistors to V are low puts the device in the Shutdown mode. Both driver CC included on chip. To minimize power consumption, the outputs are forced into three-state and the supply current internal driver pull-up resistors are disconnected from V is 0.2µA. CC in the Shutdown mode. V+: Positive Supply Output (RS232 Drivers). V+ ≅ 2V – CC TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs 2V. This pin requires an external capacitor C = 0.1µF for are in a high impedance state when in the Shutdown or charge storage. The capacitor may be tied to ground or V . With multiple devices, the V+ and V– pins may share VCC = 0V. The driver outputs are protected against ESD to CC ±10kV for human body model discharges. a common capacitor. For large numbers of devices, in- creasing the size of the shared common storage capaci- RX IN: Receiver Inputs. These pins can be forced to ±25V tors is recommended to reduce ripple. without damage. The receiver inputs are protected against V–: Negative Supply Output (RS232 Drivers). V– ≅ –(2V ESD to ±10kV for human body model discharges. Each CC receiver provides 0.4V of hysteresis for noise immunity. – 2V). This pin requires an external capacitor C = 0.1µF for charge storage. RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev- C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These els. Outputs are in a high impedance state when in the Shutdown mode. pins require two external capacitors C = 0.1µF: one from C1+ to C1– and another from C2+ to C2–. To maintain SWITCHIU G TIW E WAVEFORW S DRIVER VCC RX 1.7V VCC INPUT 1.4V 1.4V 0V INPUT 1.3V 0V DRIVER 0V 0V V+ RX 2.4V VCC OUTPUT V– OUTPUT 0.8V 0V tLHD tHLD tLHR tHLR LTC1382 • F01 LTC1382 • F02 Figure 1. Driver Propagation Delay Timing Figure 2. Receiver Propagation Delay Timing 1382fa 5

LTC1382 TEST CIRCUITS Driver Timing Test Load Receiver Timing Test Load DRIVER RX OUTPUT OUTPUT DRIVER DRIVER RX INPUT RX INPUT 51pF 3k 51pF LTC1382 • TA04 LTC1382 • TA03 ESD Test Circuit 2 17 VCC = 5V 0.1µF 4 3 5 LTC1382 7 0.1µF 0.1µF 6 VCC 0.1µF 300k 12 15 LOGIC INPUT 232 OUTPUT VCC 300k LOGIC INPUT 11 8 232 OUTPUT RS232 LINE PINS 13 14 LOGIC OUTPUT 232 INPUT PROTECTED 5k TO ±10kV 10 9 LOGIC OUTPUT 232 INPUT 5k 18 16 ON/OFF LTC1382 • TA05 1382fa 6

LTC1382 PACKAGE DESCRIPTIOU 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 2 3 4 5 6 7 8 9 .300 – .325 .130 ± .005 .045 – .065 (7.620 – 8.255) (3.302 ± 0.127) (1.143 – 1.651) .020 (0.508) MIN .065 .009 – .015 (1.651) (0.229 – 0.381) TYP +.035 .325–.015 .125 .005 .100 .018 ± .003 (8.255–+00..838891) (3M.1I7N5) (0M.1I2N7) (2B.S5C4) (0.457 ± 0.076) NOTE: INCHES 1. DIMENSIONS AREMILLIMETERS N18 0502 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) SW Package 18-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) .030 ±.005 .050 BSC .045 ±.005 TYP .447 – .463 (11.354 – 11.760) N NOTE 4 18 17 16 15 14 13 12 11 10 N .420 .325 ±.005 MIN NOTE 3 .394 – .419 (10.007 – 10.643) 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .291 – .299 1 2 3 4 5 6 7 8 9 (7.391 – 7.595) NOTE 4 .093 – .104 .037 – .045 .010 – .029 × 45°(cid:31) (2.362 – 2.642) (0.940 – 1.143) (0.254 – 0.737) .005 (0.127) RAD MIN 0° – 8° TYP .050 .009 – .013 (1.270) .004 – .012 (0.229 – 0.330) NOTE 3 .016 – .050 BSC .014 – .019 (0.102 – 0.305) (0.406 – 1.270) (0.356 – 0.482) NOTE: TYP 1. DIMENSIONS IN (MILILNICMHEETSERS) S18 (WIDE) 0502 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) 1382fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 7 However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LTC1382 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1780/LT1781 5V, 2 Driver, 2 Receiver RS232 Transeivers ±15kV ESD per IEC 1000-4 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 LTC1386 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 220µA Supply Current, Narrow 16-pin SO 1382fa 8 Linear Technology Corporation LW/TP 1002 1K REV A •PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● F AX: (408) 434-0507 ● linear.com  LINEAR TECHNOLOGY CORPORATION 1994

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LTC1382CSW#TR LTC1382IN#PBF LTC1382ISW#TR LTC1382CN LTC1382ISW LTC1382CN#PBF LTC1382ISW#TRPBF LTC1382ISW#PBF LTC1382CSW#TRPBF LTC1382CSW LTC1382CSW#PBF LTC1382IN