LT1780/LT1781 Low Power 5V RS232 Dual Driver/Receiver with – 15kV ESD Protection FEATURES DESCRIPTIOU n 10mA Max Supply Current The LT®1780/LT1781 are dual RS232 driver/receiver pairs n ESD Protection to IEC 1000-4-2 Level 4 with integral charge pump to generate RS232 voltage – 15kV Air Gap, – 8kV Contact levels from a single 5V supply. Using only 0.1m F external n Uses Small Capacitors: 0.1m F capacitors, these circuits consume only 40mW of power, n 120kBaud Operation for R = 3k, C = 2500pF and can operate to 120kbaud even while driving heavy L L n 250kBaud Operation for R = 3k, C = 1000pF capacitive loads. New ESD structures on the chip allow the L L n Outputs Withstand – 30V Without Damage LT1780/LT1781 to survive – 15kV air gap and – 8kV con- n CMOS Comparable Low Power: 40mW tact ESD tests per IEC 1000-4-2, eliminating the need for n Operates from a Single 5V Supply costly TransZorbs® on the RS232 line pins. The LT1780/ n Rugged Bipolar Design LT1781 are fully compliant with EIA RS232 standards. n Outputs Assume a High Impedance State When Off Driver outputs are protected from overload, and can be or Powered Down shorted to ground or up to – 30V without damage. During n Meets All RS232 Specifications SHUTDOWN or power-off conditions, driver and receiver n Available With or Without Shutdown outputs are in a high impedance state, allowing line n Absolutely No Latch-up sharing. The LT1780/LT1781 are direct upgrades to the LT1180A/ APPLICATIOUS LT1181A, LT1280A/LT1281A and LT1381 for applications which require the utmost ESD protection. n Portable Computers n Battery-Powered Systems The LT1781 is available in 16-pin DIP,SO and SW pack- n Power Supply Generator ages. The LT1780 is supplied in 18-pin DIP and SW n Terminals packages for applications which require SHUTDOWN. n Modems , LTC and LT are registered trademarks of Linear Technology Corporation. TransZorb is a registered trademark of General Instruments, GSI. TYPICAL APPLICATIOU 2 17 Output Waveforms 5V INPUT 0.1m F 4 3 V+ OUT LT1780 0.1m F DRIVER OUTPUT 5 7 V– OUT RL = 3k 0.1m F 6 0.1m F CL = 2500pF 12 15 RS232 OUTPUT RECEIVER LOGIC(cid:13) ROUTPUT INPUTS 11 8 CL = 50pF RS232 OUTPUT 13 14 RS232 INPUT INPUT LOGIC(cid:13) 5k OUTPUTS 10 9 RS232 INPUT 1780/81 • TA02 5k 18 16 ON/OFF 1780/81 • TA01 1

LT1780/LT1781 ABSOLUTE WAXIWUW RATIUGS (Note 1) Supply Voltage (V )................................................ 6V Short-Circuit Duration CC V+........................................................................ 13.2V V+................................................................... 30 sec V–...................................................................... –13.2V V–................................................................... 30 sec Input Voltage Driver Output.............................................. Indefinite Driver ...........................................................V– to V+ Receiver Output.......................................... Indefinite Receiver ............................................... –30V to 30V Operating Temperature Range.....................0(cid:176) C to 70(cid:176) C ON/OFF................................................. –0.3V to 12V Storage Temperature Range................ –65(cid:176) C to 150(cid:176) C Output Voltage Lead Temperature (Soldering, 10 sec)................. 300(cid:176) C Driver ...................................... V+ – 30V to V– + 30V Receiver .................................... –0.3V to V + 0.3V CC PACKAGE/ORDER IUFORWATIOU TOP VIEW ORDER TOP VIEW ORDER NC(cid:13) 1(cid:13) 18(cid:13) ON/OFF(cid:13) PART C1+(cid:13) 1(cid:13) 16(cid:13) VCC(cid:13) PART C1+(cid:13) 2(cid:13) 17(cid:13) VCC(cid:13) NUMBER V+(cid:13) 2(cid:13) 15(cid:13) GND(cid:13) NUMBER V+(cid:13) 3(cid:13) 16(cid:13) GND(cid:13) C1–(cid:13) 3(cid:13) 14(cid:13) TR1 OUT(cid:13) LT1780CN LT1781CN C1–(cid:13) 4(cid:13) 15(cid:13) TR1 OUT(cid:13) C2+(cid:13) 4(cid:13) 13(cid:13) REC1 IN(cid:13) LT1780CSW LT1781CS C2+(cid:13) 5(cid:13) 14(cid:13) REC1 IN(cid:13) C2–(cid:13) 5(cid:13) 12(cid:13) REC1 OUT(cid:13) LT1781CSW C2–(cid:13) 6(cid:13) 13(cid:13) REC1 OUT(cid:13) V–(cid:13) 6(cid:13) 11(cid:13) TR1 IN(cid:13) V–(cid:13) 7(cid:13) 12(cid:13) TR1 IN(cid:13) TR2 OUT(cid:13) 7(cid:13) 10(cid:13) TR2 IN(cid:13) TR2 OUT(cid:13) 8(cid:13) 11(cid:13) TR2 IN(cid:13) REC2 IN 8 9(cid:13) REC2 OUT REC2 IN 9 10(cid:13) REC2 OUT (cid:13) N PACKAGE(cid:13) S PACKAGE(cid:13) SW PACKAGE(cid:13) (cid:13) 16-LEAD PLASTIC DIP 16-LEAD PLASTIC SO 16-LEAD PLASTIC SO N PACKAGE(cid:13) SW PACKAGE(cid:13) 18-LEAD PLASTIC DIP 18-LEAD PLASTIC SO TJMAX = 125(cid:176)C, q JA = 90(cid:176)C/W, q JC = 46(cid:176)C/W (N) TJMAX = 125(cid:176)C, q JA = 80(cid:176)C/W, q JC = 36(cid:176)C/W (N) TJMAX = 125(cid:176)C, q JA = 95(cid:176)C/W, q JC = 34(cid:176)C/W (S) TJMAX = 125(cid:176)C, q JA = 90(cid:176)C/W, q JC = 26(cid:176)C/W (SW) TJMAX = 125(cid:176)C, q JA = 95(cid:176)C/W, q JC = 27(cid:176)C/W (SW) Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply Generator V+ Output 7.9 V V– Output –7 V Supply Current (V ) (Note 3), T = 25(cid:176) C 8 10 mA CC A l 14 mA Supply Current When OFF (V ) SHUTDOWN (Note 4) LT1780 Only l 1 10 m A CC Supply Rise Time C1 = C2 = C3 = C4 = 0.1m F 0.2 ms SHUTDOWN to Turn-On LT1780 Only 0.2 ms ON/OFF Pin Thresholds Input Low Level (Device SHUTDOWN) l 0.8 1.2 V Input High Level (Device Enabled) l 1.6 2.4 V ON/OFF Pin Current 0V £ V £ 5V l –15 80 m A ON/OFF Oscillator Frequency 130 kHz Driver Output Voltage Swing Load = 3k to GND Positive l 5.0 7.5 V Negative l –6.3 –5 V Logic Input Voltage Level Input Low Level (V = High) l 1.4 0.8 V OUT Input High Level (V = Low) l 2.0 1.4 V OUT 2

LT1780/LT1781 ELECTRICAL CHARACTERISTICS (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Logic Input Current 0.8V £ V £ 2.0V l 5 20 m A IN Output Short-Circuit Current V = 0V – 7 17 mA OUT Output Leakage Current SHUTDOWN V = – 30V (Note 4) l 10 100 m A OUT Data Rate R = 3k, C = 2500pF 120 kBaud L L R = 3k, C = 1000pF 250 kBaud L L Slew Rate R = 3k, C = 51pF 15 30 V/m s L L R = 3k, C = 2500pF 4 7 V/m s L L Propagation Delay Output Transition t High-to-Low (Note 5) 0.6 1.3 m s HL Output Transition t Low-to-High 0.5 1.3 m s LH Receiver Input Voltage Thresholds Input Low Threshold (V = High) 0.8 1.3 V OUT Input High Threshold (V = Low) 1.7 2.4 V OUT Hysteresis l 0.1 0.4 1 V Input Resistance V = – 10V 3 5 7 kW IN Output Leakage Current SHUTDOWN (Note 4) 0 £ V £ V l 1 10 m A OUT CC Output Voltage Output Low, I = –1.6mA l 0.2 0.4 V OUT Output High, I = 160m A (V = 5V) l 3.5 4.2 V OUT CC Output Short-Circuit Current Sinking Current, V = V –20 –10 mA OUT CC Sourcing Current, V = 0V 10 20 mA OUT Propagation Delay Output Transition t High-to-Low (Note 6) 250 600 ns HL Output Transition t Low-to-High 350 600 ns LH The l denotes specifications which apply over the operating temperature Note 4: Supply current measurements in SHUTDOWN are performed with range. V £ 0.1V. ON/OFF Note 1: Absolute Maximum Ratings are those values beyond which the life Note 5: For driver delay measurements, R = 3k and C = 51pF. Trigger L L of the device may be impaired. points are set between the driver’s input logic threshold and the output Note 2: Testing done at VCC = 5V and VON/OFF = 3V, unless otherwise transition to the zero crossing (tHL = 1.4V to 0V and tLH = 1.4V to 0V). specified. Note 6: For receiver delay measurements, C = 51pF. Trigger points are L Note 3: Supply current is measured as the average over several charge set between the receiver’s input logic threshold and the output transition pump cycles. C+ = C– = C1 = C2 = 0.1m F. All outputs are open, with all to standard TTL/CMOS logic threshold (tHL = 1.3V to 2.4V and tLH = 1.7V driver inputs tied high. to 0.8V). 3

LT1780/LT1781 TYPICAL PERFORWAUCE CHARACTERISTICS Driver Maximum Output Voltage Driver Minimum Output Voltage vs Load Capacitance vs Load Capacitance Driver Output Voltage 8.0 –4.0 10 RL = 3k 8 7.5 –4.5 E (V) E (V) 120k BAUD GE (V) 46 VCVCC =C =5 .55VV AG 7.0 AG–5.0(cid:13) TA VCC = 4.5V OLT 20k BAUD OLT 60k BAUD VOL 2 OUTPUT HIGH UT V 6.5 UT V–5.5 20k BAUD PUT 0 OUTPUT LOW UTP 60k BAUD UTP OUT –2 VCC = 4.5V(cid:13) PEAK O 56..50 120k BAUD PEAK O––66..50 DRIVER ––46 VCVCC =C =5 .55VV(cid:13) –8 5.0 –7.0 –10 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 –55 –25 0 25 50 75 100 125 LOAD CAPACITANCE (nF) LOAD CAPACITANCE (nF) TEMPERATURE (°C) 1780 • G01 1780 • G02 1780 • G03 Receiver Input Thresholds Supply Current vs Data Rate 3.00 50 2 DRIVERS ACTIVE(cid:13) 2.75 RL = 3k(cid:13) 2.50 40 CL = 2500pF E (V)2.25 mA) TAG2.00 INPUT HIGH NT ( 30 L E O R V1.75 R OLD 1.50 INPUT LOW Y CU 20 H L S P RE1.25 UP H S T1.00 10 0.75 0.50 0 –55 –25 0 25 50 75 100 125 0 25 50 75 100 125 150 TEMPERATURE (°C) DATA RATE (kBAUD) 1780 • G04 1780 • G05 ON/OFF Thresholds Supply Current 3.0 25 TAGE (V) 22..50 ON THRESHOLD NT (mA) 1250 2 DRIVERS LOADED RL = 3k L E O R OLD V 1.5 Y CUR 10 1 DRIVER LOADED RL = 3k H L ES 1.0 PP HR OFF THRESHOLD SU NO LOAD T 5 0.5 0 0 –55 –25 0 25 50 75 100 125 –55 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 1780 • G06 1780 • G07 4

LT1780/LT1781 TYPICAL PERFORWAUCE CHARACTERISTICS Driver Leakage in Shutdown Driver Short-Circuit Current 100 30 m(A) T (mA) 25 ISC+ 10 EN 20 R T (cid:9) R N U E C LEAKAGE CURR 1 VOVUOTU =T –= 3300VV SHORT-CIRCUIT 11055 ISC– 0.1 0 –55 –25 0 25 50 75 100 125 –55 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 1780 • G08 1780 • G09 Receiver Short-Circuit Current Slew Rate vs Load Capacitance 50 16 14 A) 40 m T ( RX ISC– 12 RREN 30 µV/s) 10 CIRCUIT CU 20 RX ISC+ LEW RATE ( 68 +SLEW T- S –SLEW HOR 10 4 S 2 0 0 –55 –25 0 25 50 75 100 125 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TEMPERATURE (°C) LOAD CAPACITANCE (nF) 1780 • G10 1780 • G11 Shutdown to Driver Outputs Driver Output Waveforms 10V DRIVER 1 OUTPUT 5V DRIVER OUTPUT GND RL = 3k CL = 2500pF GND DRIVER 2 –5V OUTPUT DRIVER OUTPUT –10V RL = 3k ON/OFF PIN INPUT 1780 • G12 1780 • G13 5

LT1780/LT1781 PIU FUU CTIOU S V : 5V Input Supply Pin. This pin should be decoupled TR1 OUT, TR2 OUT: Driver Outputs at RS232 Voltage CC with a 0.1m F ceramic capacitor close to the package pin. Levels. Driver output swing meets RS232 levels for loads Insufficient supply bypassing can result in low output up to 3k. Slew rates are controlled for lightly loaded lines. drive levels and erratic charge pump operation. Output current capability is sufficient for load conditions up to 2500pF. Outputs are in a high impedance state when GND: Ground Pin. in SHUTDOWN mode or V = 0V. Outputs are fully short- CC ON/OFF: A TTL/CMOS Compatible Operating Mode Con- circuit protected from V– + 30V to V+ – 30V. Applying trol. A logic low puts the LT1780 in SHUTDOWN mode. higher voltages will not damage the device if the overdrive Supply current drops to zero and both driver and receiver is moderately current limited. Short circuits on one outputs assume a high impedance state. A logic high fully output can load the power supply generator and may enables the device. disrupt the signal levels of the other outputs. The driver V+: Positive Supply Output (RS232 Drivers). outputs are protected against ESD to IEC-1000-4-2 V+ » 2V – 1.5V. This pin requires an external charge Level 4 discharges. CC storage capacitor C ‡ 0.1m F, tied to ground or VCC. Larger REC1 IN, REC2 IN: Receiver Inputs. These pins accept value capacitors may be used to reduce supply ripple. With RS232 level signals (– 30V) into a protected 5k terminat- multiple transceivers, the V+ and V– pins may be paralleled ing resistor. The receiver inputs are protected against ESD into common capacitors. to IEC-1000-4-2 Level 4 discharges. Each receiver pro- V–: Negative Supply Output (RS232 Drivers). vides 0.4V of hysteresis for noise immunity. Open receiver V– » –(2V – 2.5V). This pin requires an external charge inputs result in a logic high receiver output state. CC storage capacitor C ‡ 0.1m F. Larger value capacitors may REC1 OUT, REC2 OUT: Receiver outputs with TTL/CMOS be used to reduce supply ripple. With multiple transceiv- Voltage Levels. Outputs are in a high impedance state ers, the V+ and V– pins may be paralleled into common when in SHUTDOWN mode to allow data line sharing. capacitors. Outputs are fully short-circuit protected to ground or V CC with the power ON, OFF or in the SHUTDOWN mode. TR1 IN, TR2 IN: RS232 Driver Input Pins. These inputs are TTL/CMOS compatible. Inputs should not be allowed to C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. float. Tie unused inputs to VCC. These pins require two external capacitors C ‡ 0.1m F: one from C1+ to C1– and another from C2+ to C2–. C1 should be deleted if a separate 12V supply is available and connected to pin C1+. Similarly, C2 should be deleted if a separate –12V supply is connected to pin V–. 6

LT1780/LT1781 ESD PROTECTIOU The RS232 line inputs of the LT1780/LT1781 have on-chip ESD Test Circuit protection from ESD transients up to – 15kV air gap and 1(cid:13) 18(cid:13) – 8kV contact tested to IEC-1000-4-2 test methods. The NC ON/OFF C1+2(cid:13) LT1780 17(cid:13) 5V VCC protection structures act to divert the static discharge safely to system ground. In order for the ESD protection to 0.1m F 0.1m F V+3(cid:13) 16(cid:13) GND 0.1m F function effectively, the power supply and ground pins of C1–4(cid:13) 15(cid:13) DR1 OUT the circuit must be connected to ground through low C2+ RS232 (cid:13) 5(cid:13) 14(cid:13) RX1 IN LINE PINS (cid:13) impedances. The power supply decoupling capacitors and 0.1m F C2–6(cid:13) 13(cid:13) PTOR OIETCE-C1T0E0D0 -(cid:13)4-2(cid:13) charge pump storage capacitors provide this low imped- RX1 OUT LEVEL 4 ance in normal application of the circuit. The only con- 0.1m F V–7(cid:13) 12(cid:13) DR1 IN straint is that low ESR capacitors must be used for 8(cid:13) 11(cid:13) DR2 OUT DR2 IN bypassing and charge storage. ESD testing must be done RS232(cid:13) with pins VCC, VL, V+, V–, and GND shorted to ground or PRLOINTEE CPTINEDS(cid:13)(cid:13) RX2 IN 9 10 RX2 OUT TO IEC-1000-4-2(cid:13) connected with low ESR capacitors. LEVEL 4 1780 • ESD TC TYPICAL APPLICATIOU Operation Using 5V and 12V Power Supplies 2 17 12V INPUT 5V INPUT 4 3 LT1780 5 7 –12VOUT 0.1m F 0.1m F 6 12 15 RS232 OUTPUT LOGIC(cid:13) INPUTS 11 8 RS232 OUTPUT 13 14 RS232 INPUT LOGIC(cid:13) 5k OUTPUTS 10 9 RS232 INPUT 5k 18 16 ON/OFF 1780/81 • TA03 7

LT1780/LT1781 PACKAGE DESCRIPTIOU Dimensions in inches (millimeters) unless otherwise noted. N Package 16-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.770*(cid:13) (19.558)(cid:13) MAX 16 15 14 13 12 11 10 9 0.255 – 0.015*(cid:13) (6.477 – 0.381) 1 2 3 4 5 6 7 8 0.300 – 0.325(cid:13) 0.130 – 0.005(cid:13) 0.045 – 0.065(cid:13) (7.620 – 8.255) (3.302 – 0.127) (1.143 – 1.651) 0.020(cid:13) (0.508)(cid:13) MIN 0.065(cid:13) 0.009 – 0.015(cid:13) (1.651)(cid:13) (0.229 – 0.381) TYP +0.035(cid:13) 0.325 ( –0.015) 0.125(cid:13) 0.100 – 0.010(cid:13) 0.018 – 0.003(cid:13) 8.255+0.889(cid:13) (3.175)(cid:13) (2.540 – 0.254) (0.457 – 0.076) –0.381 MIN *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.(cid:13) MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) N16 1197 N Package 18-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.900*(cid:13) (22.860)(cid:13) MAX 18 17 16 15 14 13 12 11 10 0.255 – 0.015*(cid:13) (6.477 – 0.381) 1 2 3 4 5 6 7 8 9 0.300 – 0.325(cid:13) 0.130 – 0.005(cid:13) 0.045 – 0.065(cid:13) (7.620 – 8.255) (3.302 – 0.127) (1.143 – 1.651) 0.020(cid:13) (0.508)(cid:13) MIN 0.065(cid:13) 0.009 – 0.015(cid:13) (1.651)(cid:13) (0.229 – 0.381) TYP +0.035(cid:13) (0.325–0.015) 0.125(cid:13) 0.005(cid:13) 0.018 – 0.003(cid:13) (0.127)(cid:13) 8.255–+00..838891(cid:13) (3M.1I7N5)(cid:13) MIN (0.457 – 0.076) 0.100 – 0.010(cid:13) (2.540 – 0.254) N18 1197 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.(cid:13) MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 8

LT1780/LT1781 PACKAGE DESCRIPTIOU Dimensions in inches (millimeters) unless otherwise noted. SW Package 16-Lead Plastic Small Outline (Wide 0.300) (LTC DWG # 05-08-1620) 0.398 – 0.413*(cid:13) (10.109 – 10.490) 16 15 14 13 12 11 10 9 NOTE 1 0.394 – 0.419(cid:13) (10.007 – 10.643) 0.291 – 0.299**(cid:13) (7.391 – 7.595) 1 2 3 4 5 6 7 8 0.093 – 0.104(cid:13) 0.037 – 0.045(cid:13) 0.010 – 0.029(cid:13) · 45(cid:176) (2.362 – 2.642) (0.940 – 1.143) (0.254 – 0.737) 0° – 8° TYP 0.050(cid:13) 0.009 – 0.013(cid:13) (1.270)(cid:13) 0.004 – 0.012(cid:13) (0.229 – 0.330) NOTE 1 TYP (0.102 – 0.305) 0.014 – 0.019(cid:13) 0.016 – 0.050(cid:13) (0.356 – 0.482)(cid:13) (0.406 – 1.270) TYP NOTE:(cid:13) 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.(cid:13) S16 (WIDE) 0396 THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS *(cid:13)DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE(cid:13) **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE(cid:13) (cid:13) (cid:13) 9

LT1780/LT1781 PACKAGE DESCRIPTIOU Dimensions in inches (millimeters) unless otherwise noted. SW Package 18-Lead Plastic Small Outline (Wide 0.300) (LTC DWG # 05-08-1620) 0.447 – 0.463*(cid:13) (11.354 – 11.760) 18 17 16 15 14 13 12 11 10 SEE NOTE 0.394 – 0.419(cid:13) (10.007 – 10.643) 0.291 – 0.299**(cid:13) 1 2 3 4 5 6 7 8 9 (7.391 – 7.595) 0.093 – 0.104(cid:13) 0.037 – 0.045(cid:13) 0.010 – 0.029(cid:13) · 45(cid:176) (2.362 – 2.642) (0.940 – 1.143) (0.254 – 0.737) 0° – 8° TYP 0.050(cid:13) 0.009 – 0.013(cid:13) (1.270)(cid:13) 0.004 – 0.012(cid:13) (0.229 – 0.330) NOTE 1 TYP (0.102 – 0.305) 0.014 – 0.019(cid:13) 0.016 – 0.050(cid:13) (0.356 – 0.482)(cid:13) (0.406 – 1.270) TYP NOTE:(cid:13) 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.(cid:13) S18 (WIDE) 0396 THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS *(cid:13)DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE(cid:13) **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE(cid:13) (cid:13) (cid:13) 10

LT1780/LT1781 PACKAGE DESCRIPTIOU Dimensions in inches (millimeters) unless otherwise noted. S Package 16-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.386 – 0.394*(cid:13) (9.804 – 10.008) 16 15 14 13 12 11 10 9 0.228 – 0.244(cid:13) 0.150 – 0.157**(cid:13) (5.791 – 6.197) (3.810 – 3.988) 1 2 3 4 5 6 7 8 0.010 – 0.020(cid:13) · 45(cid:176) 0.053 – 0.069(cid:13) (0.254 – 0.508) (1.346 – 1.752) 0.004 – 0.010(cid:13) 0.008 – 0.010(cid:13) (0.203 – 0.254) 0° – 8° TYP (0.101 – 0.254) 0.014 – 0.019(cid:13) 0.050(cid:13) 0.016 – 0.050(cid:13) (0.355 – 0.483) (1.270)(cid:13) 0.406 – 1.270 TYP S16 0695 *(cid:13)DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH (cid:13) (cid:13)SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE(cid:13) **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD (cid:13) FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE(cid:13) (cid:13) (cid:13) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 11 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.

LT1780/LT1781 TYPICAL APPLICATIOU Supporting an LT1039 (Triple Driver/Receiver) SHUTDOWN 5V 18 17 18 17 ON/OFF VCC VCC ON/OFF LT1780 LT1039 11 8 15 4 TTL INPUT RS232 OUTPUT TTL INPUT RS232 OUTPUT 12 15 13 6 TTL INPUT RS232 OUTPUT TTL INPUT RS232 OUTPUT 11 8 TTL INPUT RS232 OUTPUT 13 14 16 3 TTL OUTPUT RS232 INPUT TTL OUTPUT RS232 INPUT 5k 30k 10 9 14 5 TTL OUTPUT RS232 INPUT TTL OUTPUT RS232 INPUT 5k 30k 2 12 (cid:13)7 C1+ TTL OUTPUT RS232 INPUT 1m F 4 30k C1– 5 3 1 C2+ V+ V+ 1m F 6 C2– V– 7 9 V– GND GND 1m F 1m F 16 10 1780/81 • TA04 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1137A 3Driver/5Receiver RS232 Transceiver IEC-1000-4-2 Level 4 ESD Compliance LTC1383 5V Low Power RS232 2Driver/2Receiver Transceiver Low Supply Current I = 220m A CC LTC1387 Single 5V RS232/RS485 Multiprotocol Transceiver Configurable as Dual RS232 or Single RS485 Transceiver 12 Linear Technology Corporation 17801f LT/TP 0498 4K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)4 32-1900 l FAX: (408) 434-0507 l w ww.linear-tech.com ª LINEAR TECHNOLOGY CORPORATION 1998

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LT1781CN LT1781IN LT1780CSW LT1781IS#PBF LT1780CSW#TRPBF LT1781IS#TR LT1780CSW#PBF LT1781IN#PBF LT1781ISW#PBF LT1780ISW#PBF LT1781CSW#PBF LT1781CS#TR LT1780CSW#TR LT1781IS#TRPBF LT1780IN LT1781ISW#TR LT1780IN#PBF LT1780CN LT1780ISW#TR LT1781CS#TRPBF LT1780ISW LT1781CSW LT1781ISW#TRPBF LT1781IS LT1781CSW#TRPBF LT1781CS LT1780ISW#TRPBF LT1780CN#PBF LT1781CS#PBF LT1781CSW#TR LT1781ISW LT1781CN#PBF