DESCRIPTION FEATURES APPLICATIONS TYPICAL APPLICATION. LT1039A/LT1039A-16 Triple RS232 Driver/Receiver with Shutdown

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1 FEATRES On-Chip ESD Protection: ±15kV Human Body Model ±15kV IEC Air Gap Test** ±8kV IEC Contact Test 125kBd Operation with 3kΩ/2500pF Load 250kBd Operation with 3kΩ/00pF Load Operates from ± to ±1 Supplies Fully Protected Against Overload Outputs Can Be Driven ±3 Without Damage Three-State Outputs; Outputs Open When Off Bipolar Circuit No Latchup ±3 Input Range Triple Driver/Receiver No Supply Current in Shutdown Ω Input Impedance Meets All Specifications 16-Pin Version Pin Compatible with MC Available in SO Package APPLICATIONS Interface Terminals Modems Triple Driver/Receiver with Shutdown DESCRIPTION The LT 39A is a triple driver/receiver that includes shutdown. Each receiver will accept up to ±3 input and can drive either TTL or CMOS logic. The drivers accept TTL logic inputs and output voltage levels. The outputs are fully protected against overload and can be shorted to ground or up to ±3 without damage to the drivers. Additionally, when the system is shut down or power is off, the outputs are in a high impedance state allowing data line sharing. On-chip ESD protection eliminates the need for external protection devices. A bias pin allows one receiver to be kept on while the rest of the part is shut down. The LT39A is also available in the 16-pin version, without shutdown or bias pin functions. For applications requiring operation from a single supply, see the LT1180A/LT1181A and LT1130A data sheets., LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION OT *BIAS PIN SED TO KEEP THE OT ON WHILE IN SHTDOWN **50Ω RESISTORS MAY BE REQIRED FOR IEC ESD PROTECTION OT DEPENDING PON PC BOARD AND CONNECTOR LEAD LENGTH 12V BIAS* 50Ω** 50Ω** 50Ω** 12V V + V V CC LT39A GND 39A TA OTPT VOLTAGE REFERRED TO SPPLIES (V) Driver Output Swing V V OTPT CRRENT (ma) 39A TA02 1

2 ABSOLTE MAXIMM RATINGS W W W Supply Voltage Driver (V +, V )... ±16V Receiver (V CC )... 7V Logic Inputs... V to 2 Receiver Inputs... ±3 Input... GND to 12V Driver Outputs... V + 3 to V + 3 Short-Circuit Duration... Indefinite Operating Temperature Range LT39AC... 0 C to 70 C LT39AI C to 85 C LT39AM C to 125 C Storage Temperature Range C to 150 C Lead Temperature (Soldering, sec) C PACKAGE/ORDER INFORMATION V + 1 REC1 IN 2 TR1 OT 3 REC2 IN 4 TR2 OT 5 REC3 IN 6 TR3 OT 7 V 8 J PACKAGE 16-LEAD CERDIP TOP VIEW N PACKAGE 16-LEAD PDIP SW PACKAGE 16-LEAD PLASTIC SO WIDE 16 V CC 15 REC1 OT 14 TR1 IN 13 REC2 OT 12 TR2 IN 11 REC3 OT TR3 IN 9 GND T JMAX = 150 C, θ JA = 5 C/ W, θ JC = 30 C/ W (J) T JMAX = 125 C, θ JA = 90 C/ W, θ JC = 50 C/ W (N) T JMAX = 125 C, θ JA = 95 C/ W, θ JC = 27 C/ W (SW) W ORDER PART NMBER LT39ACN16 LT39ACSW16 LT39AIN16 LT39AISW16 LT39AMJ16 Consult Factory for Availability V + 1 BIAS 2 REC1 IN 3 TR1 OT 4 REC2 IN 5 TR2 OT 6 REC3 IN 7 TR3 OT 8 V 9 J PACKAGE 18-LEAD CERDIP TOP VIEW 18 V CC 16 REC1 OT 15 TR1 IN 14 REC2 OT 13 TR2 IN 12 REC3 OT 11 TR3 IN GND N PACKAGE 18-LEAD PDIP SW PACKAGE 18-LEAD PLASTIC SO WIDE T JMAX = 150 C, θ JA = 88 C/ W, θ JC = 22 C/ W (J) T JMAX = 125 C, θ JA = 79 C/ W, θ JC = 36 C/ W (N) T JMAX = 125 C, θ JA = 90 C/ W, θ JC = 26 C/ W (SW) ORDER PART NMBER LT39ACN LT39ACSW LT39AIN LT39AISW LT39AMJ ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS TYP MAX NITS Driver V + = 12V, V = 12V, V = 2. (Note 1) Output Voltage Swing Load = 3k to Ground Positive V V V Negative V V V Logic Input Voltage Levels Input Low Level (V OT = High) V Input High Level (V OT = Low) V Logic Input Current V IN µa V IN 0.8V 5 20 µa Output Short-Circuit Current Sourcing Current, V OT = ma Sinking Current, V OT = ma Output Leakage Current Shutdown (Notes 2, 3), V OT = ±18V, V IN = 200 µa Supply Leakage Current Shutdown (Note 2) 1 0 µa Slew Rate R L = 3k, C L = 51pF to 2500pF V/µs Supply Current V OT = Low 1 5 ma 2

3 ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS TYP MAX NITS Prop Delay (t PLH ) µs (t PHL ) µs Receiver V CC =, V = 2. (Note 1) Input Voltage Thresholds Input Low Level (V OT = High) V Input High Level (V OT = Low) V Hysteresis V Input Resistance 30 kω Output Voltage Output Low, I OT = 1.6mA V Output High, I OT = 160µA V Output Short-Circuit Current Sourcing Current, V OT = V CC 30 ma Sinking Current, V OT = ma Output Leakage Current Shutdown (Note 1), V OT V CC, V IN = 1 µa Supply Current (Note 4) 2 5 ma Supply Leakage Current Shutdown (Note 2) 1 0 µa Pin Current V µa Prop Delay (t PLH ) ns (t PHL ) ns The denotes specifications which apply over the full operating temperature range. Note 1: V = for LT39AM grade devices. Note 2: V = 0.4V for 55 C T A 0 C and V = 0.2V for 0 C T A 125 C. Does not apply to LT39A-16 part. Note 3: For T A 0 C leakage current is 350µA max. Note 4: Bias pin open on 18-pin version. TYPICAL PERFORMANCE CHARACTERISTICS W 50 Driver Output Short-Circuit Current 3.00 Receiver Input Thresholds 5.0 Pin Thresholds OTPT CRRENT (ma) SINKING SORCING INPT VOLTAGE (V) INPT HIGH INPT LOW PIN VOLTAGE (V) IMM ON VOLTAGE IMM OFF VOLTAGE TEMPERATRE ( C) TEMPERATRE ( C) TEMPERATRE ( C) 39A G01 39A G02 39A G03 3

TYPICAL PERFORMANCE CHARACTERISTICS W SPPLY CRRENT (na) 00 0 Supply Current in Shutdown SPPLY CRRENT MEASRED INTO V CC AND V + 1 55 25 0 25 50 75 0 125 TEMPERATRE ( C) OTPT LEAKAGE CRRENT (µa) 00 0

4 TYPICAL PERFORMANCE CHARACTERISTICS W SPPLY CRRENT (na) 00 0 Supply Current in Shutdown SPPLY CRRENT MEASRED INTO V CC AND V TEMPERATRE ( C) OTPT LEAKAGE CRRENT (µa) 00 0 Driver Output Leakage in Shutdown V OT 3 V OT TEMPERATRE ( C) OTPT CRRENT (ma) Receiver Output Short-Circuit Current 0 55 SINKING SORCING TEMPERATRE ( C) 39A G04 39A G05 39A G06 INPT CRRENT (µa) Pin Current vs Voltage INPT VOLTAGE (V) Output Waveforms 39A G07 OTPT VOLTAGE REFERRED TO SPPLIES (V) Driver Output Swing vs Current V V OTPT CRRENT (ma) Shutdown to Driver Output 39A TA02 OTPT DRIVER OTPT INPT V V 39A G09 V + = 12V 2µs/DIV V = 12V V CC = R L = 3k DRIVER OTPT CONNECTED TO INPT DRIVER OTPT DRIVER OTPT INPT V V V + = 12V V = 12V R L = 3k 2µs/DIV 39A G OTPT HIGH OTPT LOW 4

TYPICAL PERFORMANCE CHARACTERISTICS W Shutdown to Receiver Output BIAS Pin Response Time OTPT 6V 4V 2V 1 OTPT 6V 4V 2V INPT BIAS INPT (THR 25kΩ) V CC = 2ms/DIV 39A G11 V CC = 0.

Driver outputs are in a high impedance state when V + and V =. BIAS (Pin 2): Keeps receiver 1 on while the LT1309A is in the shutdown mode. Leave BIAS pin open when not in use.

5 TYPICAL PERFORMANCE CHARACTERISTICS W Shutdown to Receiver Output BIAS Pin Response Time OTPT 6V 4V 2V 1 OTPT 6V 4V 2V INPT BIAS INPT (THR 25kΩ) V CC = 2ms/DIV 39A G11 V CC = 0.2µs/DIV 39A G12 PIN FNCTIONS (Pin numbers listed are for 18-pin device) V +, V (Pins 1, 9): Driver Supply Pins. Supply current drops to zero in shutdown mode. Driver outputs are in a high impedance state when V + and V =. BIAS (Pin 2): Keeps receiver 1 on while the LT1309A is in the shutdown mode. Leave BIAS pin open when not in use. See Applications Information for proper use. REC IN (Pins 3, 5, 7): Receiver Input Pins. Accepts voltage levels (±3) and has 0.4V of hysteresis to provide noise immunity. Input impedance is nominally Ω. Receiver input pins are internally protected from ESD transients. In order to insure proper functioning of the ESD protection devices, the V CC and V supply pins must be bypassed with low ESR capacitors located close to the pins. A 0.1µF ceramic capacitor works well. TR OT (Pins 4, 6, 8): Driver Outputs with Voltage Levels. Outputs are in a high impedance state when in the shutdown mode or when power is off (V + and V = ) to allow data line sharing. Outputs are fully short-circuit protected from V + 3 to V + 3 with power on, off or in the shutdown mode. Typical output breakdowns are greater than ±4 and higher applied voltages will not damage the device if moderately current limited. Driver output pins are internally protected from ESD transients. In order to insure proper functioning of the ESD protection devices, the V + and V supply pins must be bypassed with low ESR capacitors located close to the pins. 0.1µF ceramic capacitors work well. GND (Pin ): Ground Pin. TR IN (Pins 11, 13, 15): Driver Input Pins. Inputs are TTL/CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to V CC. REC OT (Pins 12, 14, 16): Receiver Outputs with TTL/ CMOS Voltage Levels. Outputs are in a high impedance state when in the shutdown mode to allow data line sharing. Outputs are fully short-circuit protected to ground or V CC with power on, off or in the shutdown mode. (Pin ): Controls the operation mode of the LT39A and is TTL/CMOS compatible. A logic low puts the device in the shutdown mode which reduces input supply current to zero and places both driver and receiver outputs in a high impedance state. V CC (Pin 18): Power for Receivers. 5

6 APPLICATIONS INFORMATION W The driver output stage of the LT39A offers significantly improved protection over older bipolar and CMOS designs. In addition to current limiting, the driver output can be externally forced to ±3 with no damage or excessive current flow. LT39A Driver INPT A Sharing a Receiver Line LT39A #1 3 INPT B LT39A #2 OTPT LT39A OTPT CAN BE FORCED EXTERNALLY 3 39A AI01 The driver outputs utilize high impedance overvoltage protection, eliminating the flow of fault currents into supplies, as will happen with conventional diode clamp configurations. (CHANNEL SELECT) INPT INVERTER Transceiver 39A AI04 Older Drivers and Other CMOS Drivers V + TRANSMIT/RECEIVE LINE LT39A #1 DRIVER TRANSMIT/RECEIVE LINE V WITH SOME DRIVERS, EXTERNALLY APPLIED VOLTAGE CAN FORCE THE SPPLIES 39A AI02 LT39A #2 Placing the LT39A in the shutdown mode (Pin low) puts both the driver and receiver outputs in a high impedance state. This allows data line sharing and transceiver applications. (TRANSMIT/RECEIVE) INPT INVERTER 39A AI05 Sharing a Transmitter Line The shutdown mode also drops all supply currents (V CC, V +, V ) to zero for power conscious systems. INPT A LT39A #1 DRIVER INPT B LT39A #2 DRIVER TRANSMISSION LINE (CHANNEL SELECT) INPT 6 INVERTER 39A AI03

7 APPLICATIONS INFORMATION W When driving CMOS logic from a receiver that will be used in the shutdown mode and there is no other active receiver on the line, a 51k resistor can be placed from the logic input to V CC to force a definite logic level when the receiver output is in a high impedance state. Driving CMOS Logic from a Receiver V CC Driver inputs should not be allowed to float. Any unused inputs should be tied to V CC. The BIAS pin is used to keep alive one receiver while in the shutdown mode (all other circuitry being inactive). This allows a system to be in shutdown and still have one active receiver for transferring data. Keeping Alive One Receiver While in Shutdown INPT LT39A 51k* CMOS OTPT 25k SHTDOWN INPT INPT *FORCES INPT STATE WHEN V IS LOW 39A AI06 2 BIAS To protect against receiver input overloads in excess of ±3, a voltage clamp can be placed on the data line and still maintain compatibility. INPT 3 16 LT39A 39A AI07 OTPT INPT Input Overvoltage Protection 1k 3 5.6k 3 OTPT It can also be used to make an compatible shutdown control line. Driving the BIAS pin low through a resistance of 24k to keeps the receiver active. Do not drive the BIAS pin directly from a logic output without the series resistor. An unused BIAS pin should be left open. 39A AI07 Compatible Shutdown Control Line The receiver input impedance of the LT39A is nominally Ω. For applications requiring a 5kΩ input impedance, a 5.6k resistor can be connected from the receiver input to ground. 5kΩ Impedance Matching SHTDOWN INPT 25k 2 BIAS 3 16 LT39A INPT 5.6k OTPT 39A AI08 39A AI08 7

8 PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. J Package 16-Lead CERDIP (Narrow 0.300, Hermetic) (LTC DWG # ) CORNER LEADS OPTION (4 PLCS) (0.127) (21.336) MAX ( ) FLL LEAD OPTION BSC (0.762 BSC) ( ) HALF LEAD OPTION (0.635) RAD TYP ( ) (5.080) MAX ( ) ( ) ± (9.779 ± 0.635) (3.5) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS ( ) ( ) 0.0 ± 0.0 (2.540 ± 0.254) J J Package 18-Lead CERDIP (Narrow 0.300, Hermetic) (LTC DWG # ) ( ) FLL LEAD OPTION CORNER LEADS OPTION (4 PLCS) ( ) HALF LEAD OPTION (0.127) (0.635) RAD TYP (24.384) MAX ( ) BSC (0.762 BSC) (5.080) MAX ( ) ( ) ± (9.779 ± 0.635) (3.5) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS ( ) ( ) 0.0 ± 0.0 (2.540 ± 0.254) J

9 PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. N Package 16-Lead PDIP (Narrow 0.300) (LTC DWG # ) 0.770* (19.558) MAX ± 0.015* (6.477 ± 0.381) ( ) ± (3.302 ± 0.127) ( ) ( ) ( ) (0.381) (3.5) (0.127) 0.0 ± 0.0 (2.540 ± 0.254) *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED 0.0 INCH (0.254mm) (1.651) TYP ± (0.457 ± 0.076) N N Package 18-Lead PDIP (Narrow 0.300) (LTC DWG # ) 0.900* (22.860) MAX ± 0.015* (6.477 ± 0.381) ( ) ± (3.302 ± 0.127) ( ) ( ) ( ) (0.381) (3.5) *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED 0.0 INCH (0.254mm) (0.127) 0.0 ± 0.0 (2.540 ± 0.254) (1.651) TYP ± (0.457 ± 0.076) N

10 PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. SW Package 16-Lead Plastic Small Outline (Wide 0.300) (LTC DWG # ) * (.9.490) NOTE ( ) ** ( ) ( ) ( ) ( ) 0 8 TYP ( ) (1.270) TYP ( ) TYP NOTE ( ) NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANFACTRING OPTIONS. THE PART MAY BE SPPLIED WITH OR WITHOT ANY OF THE OPTIONS *DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.0" (0.254mm) PER SIDE ( ) S16 (WIDE) 0396

11 PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. SW Package 18-Lead Plastic Small Outline (Wide 0.300) (LTC DWG # ) * ( ) SEE NOTE ( ) ** ( ) ( ) ( ) ( ) 0 8 TYP ( ) NOTE ( ) (1.270) TYP ( ) TYP NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANFACTRING OPTIONS. THE PART MAY BE SPPLIED WITH OR WITHOT ANY OF THE OPTIONS *DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.0" (0.254mm) PER SIDE ( ) S18 (WIDE) 0396 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. 11

12 TYPICAL APPLICATION LT1180A (Driver/Receiver with Power Supply) Driving an LT39A SHTDOWN 18 V CC LT1180A 18 V CC LT39A TTL IN OT TTL IN OT TTL IN OT TTL IN OT TTL IN OT TTL OT TTL OT 5k TTL OT 0.1µF 0.1µF C1 + 4 C1 5 C2 + 6 C2 GND 16 5k V + V 3 7 TTL OT TTL OT µF 0.1µF 1 9 V + V GND 39A TA03 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LTC 485 Low Power RS485 Transceiver Industry Standard LT1137A 3 Driver/5 Receiver Transceiver ±15kV ESD Protection LT1180A/81A 2 Driver/2 Receiver Transceiver Industry Standard, 0.1µF Capacitors LTC1345 V.35 Transceiver Single Supply sing 0.1µF Capacitors LTC V 3 Driver/5 Receiver Transceiver Operates from 3.3V to Supplies, 5 Receivers Active in Shutdown 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA (408) FAX: (408) TELEX: af LT/TP K PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 1997

DESCRIPTIO FEATURES TYPICAL APPLICATIO. LT1080/LT1081 Advanced Low Power 5V RS232 Dual Driver/Receiver APPLICATIO S

DESCRIPTIO FEATURES TYPICAL APPLICATIO. LT1080/LT1081 Advanced Low Power 5V RS232 Dual Driver/Receiver APPLICATIO S Advanced Low Power V RS Dual Driver/Receiver FEATRES Superior to CMOS Improved Speed: Operates over kbaud Improved Protection: Outputs Can Be Forced to ±0V without Damage Three-State Outputs Are High Impedance