Datasheet

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LT1039A/LT1039A-16

1039afb

For more information www.linear.com/1039

Typical applicaTion

FeaTures DescripTion

Triple RS232 Driver/Receiver

with Shutdown

The LT C

1039A is a triple RS232 driver/receiver that

includes shutdown. Each receiver will accept up to ±30V

input and can drive either TTL or CMOS logic. The RS232

drivers accept TTL logic inputs and output RS232 voltage

levels. The outputs are fully protected against overload and

can be shorted to ground or up to ±30V 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 elimi

nates 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 LT1039A is also available in the 16-pin version, without

shutdown or bias pin functions.

For applications requiring operation from a single 5V

supply, see the LT1180A/LT1181A and LT1130A data

sheets.

Driver Output Swing

applicaTions

On-Chip ESD Protection:

±15kV Human Body Model

±15kV IEC-1000-4-2 Air Gap Test**

±8kV IEC-1000-4-2 Contact Test

125kBd Operation with 3kΩ/2500pF Load

250kBd Operation with 3kΩ/1000pF Load

Outputs Can Be Driven ±30V Without Damage

No Supply Current in Shutdown

Operates from ±5V to ±15V Supplies

Fully Protected Against Overload

Three-State Outputs; Outputs Open When Off

Bipolar Circuit—No Latchup

±30V Input Range

Triple Driver/Receiver

30kΩ Input Impedance

Meets All RS232 Specifications

16-Pin Version—Pin Compatible with MC145406

Available in SO Package

RS232 Interface

Terminals

Modems

L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

30k

LT1039A

–

GND

12V

BIAS*

RS232 IN

ON/

OFF

LOGIC

*BIAS PIN USED

TO KEEP THE

RECEIVER ON

WHILE IN SHUTDOWN

**50Ω RESISTORS

MAY BE REQUIRED

FOR IEC-1000-4-2

ESD PROTECTION

DEPENDING UPON

PC BOARD AND

CONNECTOR LEAD LENGTH

RS232 IN

RS232 OUT

RS232 IN

–12V

1039A TA01

30k

50Ω**

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)

–0.8

4.0

1039A TA02

0.8

–1.2

–1.6

–2.0

–0.4

1.2

0.4

–

1.0

2.0

3.0

0.5 4.5

1.5

2.5

3.5

5.0

Summary of content (14 pages)

PAGE 1
LT1039A/LT1039A-16 Triple RS232 Driver/Receiver with Shutdown Features Description On-Chip ESD Protection: ±15kV Human Body Model ±15kV IEC-1000-4-2 Air Gap Test** ±8kV IEC-1000-4-2 Contact Test n 125kBd Operation with 3kΩ/2500pF Load n 250kBd Operation with 3kΩ/1000pF Load n Outputs Can Be Driven ±30V Without Damage n No Supply Current in Shutdown n Operates from ±5V to ±15V Supplies n Fully Protected Against Overload n Three-State Outputs; Outputs Open When Off n Bipolar Circuit—No Latchup n ±30V
PAGE 2
LT1039A/LT1039A-16 Absolute Maximum Ratings (Note 1) Supply Voltage Driver (V+, V–)...................................................... ±16V Receiver (VCC).........................................................7V Logic Inputs......................................................V– to 25V Receiver Inputs........................................................±30V ON/OFF Input.................................................GND to 12V Driver Outputs................................
PAGE 3
LT1039A/LT1039A-16 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Driver V+ = 12V, V– = –12V, VON/OFF = 2.5V (Note 2) Output Voltage Swing Load = 3k to Ground Positive Negative l l Logic Input Voltage Levels Input Low Level (VOUT = High) Input High Level (VOUT = Low) l l Logic Input Current VIN ≥ 2.0V VIN ≥ 0.
PAGE 4
LT1039A/LT1039A-16 Typical Performance Characteristics Driver Output Short-Circuit Current 45 2.75 4.5 2.50 4.0 INPUT VOLTAGE (V) SINKING 30 25 SOURCING 20 15 2.25 1.75 1.50 1.25 10 1.00 5 0.75 50 25 0 75 TEMPERATURE (°C) 100 INPUT HIGH 2.00 INPUT LOW 0.
PAGE 5
LT1039A/LT1039A-16 Typical Performance Characteristics Shutdown to Driver Output 10V RECEIVER 5V OUTPUT 0V OUTPUT HIGH 0V DRIVER OUTPUT –5V –10V ON/OFF 5V INPUT 0V BIAS Pin Response Time Shutdown to Receiver Output OUTPUT LOW 6V 6V RECEIVER 1 4V OUTPUT 2V RECEIVER 4V OUTPUT 2V 0V BIAS INPUT (THRU 25kΩ) ON/OFF 5V INPUT 0V V+ = 12V V – = –12V RL = 3k 2µs/DIV Pin Functions 1039A G10 0V 5V 0V VCC = 5V 2ms/DIV 1039A G11 VCC = 5V 0.
PAGE 6
LT1039A/LT1039A-16 Applications Information The driver output stage of the LT1039A offers significantly improved protection over older bipolar and CMOS designs. In addition to current limiting, the driver output can be externally forced to ±30V with no damage or excessive current flow.
PAGE 7
LT1039A/LT1039A-16 Applications Information 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 VCC to force a definite logic level when the receiver output is in a high impedance state. Driving CMOS Logic from a Receiver CMOS LOGIC 51k* LT1039A RECEIVER Input Overvoltage Protection RS232 INPUT RECEIVER 30k 30V 5.
PAGE 8
LT1039A/LT1039A-16 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. J Package 18-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) .005 (0.127) MIN .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .960 (24.384) MAX 18 17 16 15 14 13 12 11 10 .220 – .310 (5.590 – 7.870) .025 (0.635) RAD TYP .045 – .065 (1.143 – 1.650) FULL LEAD OPTION 1 2 3 4 5 6 7 8 9 .200 (5.
PAGE 9
LT1039A/LT1039A-16 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .770* (19.558) MAX 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 .255 ±.015* (6.477 ±0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE ) .130 ±.005 (3.302 ±0.127) .045 – .065 (1.143 – 1.651) .
PAGE 10
LT1039A/LT1039A-16 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N Package 18-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .920* (23.368) MAX 18 17 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 .255 ±.015* (6.477 ±0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) .130 ±.005 (3.302 ±0.127) .045 – .065 (1.143 – 1.651) .020 (0.508) MIN .
PAGE 11
LT1039A/LT1039A-16 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. SW Package 16-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) .050 BSC .045 ±.005 .030 ±.005 TYP .398 – .413 (10.109 – 10.490) NOTE 4 16 N 15 14 13 12 11 10 9 N .325 ±.005 .420 MIN .394 – .419 (10.007 – 10.643) NOTE 3 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .005 (0.127) RAD MIN .009 – .013 (0.229 – 0.330) NOTE: 1.
PAGE 12
LT1039A/LT1039A-16 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. SW Package 18-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) .050 BSC .045 ±.005 .030 ±.005 TYP .447 – .463 (11.354 – 11.760) NOTE 4 N 18 16 15 14 13 12 11 10 N .325 ±.005 .420 MIN 17 .394 – .419 (10.007 – 10.643) NOTE 3 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .005 (0.127) RAD MIN .009 – .013 (0.229 – 0.
PAGE 13
LT1039A/LT1039A-16 Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION B 12/12 Removed LT1039AI from Abs Max Ratings and Package/Order Information PAGE NUMBER Updated N and SW Package Descriptions 2 9-12 1039afb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 14
LT1039A/LT1039A-16 Typical Application LT1180A (Driver/Receiver with Power Supply) Driving an LT1039A SHUTDOWN 18 ON/OFF VCC LT1039A 5V 17 18 VCC ON/OFF LT1039A 17 TTL IN RS232 OUT TTL IN RS232 OUT TTL IN RS232 OUT TTL IN RS232 OUT TTL IN RS232 OUT RS232 IN TTL OUT TTL OUT RS232 IN 30k TTL OUT 0.1µF 0.1µF + + RS232 IN 2 C+ 4 C– 5 6 30k RS232 IN 30k TTL OUT C+ C– TTL OUT 30k GND 3 V+ 7 V– RS232 IN 1 + 16 0.1µF + 9 0.