LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
SLLS105B ± D3627, FEBRUARY 1991 ± REVISED JANUARY 1992
• Meets All EIA-232-D (Revision of RS-232-C) |
DW OR N PACKAGE |
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Specifications |
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(TOP VIEW) |
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• Three Independent Drivers and Receivers |
VDD+ |
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VCC |
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1 |
18 |
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Per Package |
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BIAS |
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2 |
17 |
ON/OFF |
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• EIA-232 Inputs and Outputs Withstand |
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R1IN |
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3 |
16 |
R1OUT |
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±30 V |
D1OUT |
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4 |
15 |
D1IN |
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• 3-State Outputs |
R2IN |
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5 |
14 |
R2OUT |
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D2OUT |
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6 |
13 |
D2IN |
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• All Outputs Are Short-Circuit Protected |
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R3IN |
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7 |
12 |
R3OUT |
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8 |
11 |
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• Virtually Zero Supply Current When |
D3OUT |
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D3IN |
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VDD ± |
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9 |
10 |
GND |
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Shutdown |
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• Output of Several Devices Can Be |
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Paralleled |
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• Operates From ±5-V to ±15-V Supplies |
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• Designed to Be Interchangeable With |
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Linear Technology LT1039 |
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description
The LT1039 is a triple EIA-232 line transceiver designed to meet the requirements of Standard EIA-232-D. All outputs are fully protected against an overload or short to ground. A major advantage of the LT1039 is high-impedance output states when the device is off or powered down. This feature allows several different devices to be connected together on the same bus.
The bias pin provides a receiver to be kept alive when the LT1039 is shutdown (ON/OFF = low).
The LT1039 is characterized for operation from 0°C to 70°C.
AVAILABLE OPTIONS
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PACKAGE |
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TA |
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SMALL OUTLINE |
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PLASTIC DIP |
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(DW) |
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(N) |
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0°C to 70°C |
LT1039CDW |
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LT1039CN |
The DW package is available taped and reeled. Add the suffix R to the device type (i.e., LT1039CDWR).
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright 1992, Texas Instruments Incorporated
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
2±1 |
LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
SLLS105B ± D3627, FEBRUARY 1991 ± REVISED JANUARY 1992
logic symbol²
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17 |
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ON/OFF |
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EN |
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BIAS |
2 |
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16 |
R1OUT |
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3 |
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R1IN |
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R2IN |
5 |
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14 |
R2OUT |
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12 |
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R3IN |
7 |
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R3OUT |
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15 |
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D1OUT |
4 |
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D1IN |
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13 |
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D2OUT |
6 |
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D2IN |
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D3OUT |
8 |
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11 |
D3IN |
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² This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram
ON/OFF |
17 |
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2 |
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BIAS |
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R1IN |
3 |
16 |
R1OUT |
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R2IN |
5 |
14 |
R2OUT |
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R3IN |
7 |
12 |
R3OUT |
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D1OUT |
4 |
15 |
D1IN |
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D2OUT |
6 |
13 |
D2IN |
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D3OUT |
8 |
11 |
D3IN |
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2±2 |
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
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SLLS105B ± D3627, FEBRUARY 1991 ± REVISED JANUARY 1992 |
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Terminal Functions |
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PIN |
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DESCRIPTION |
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NAME |
NO. |
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BIAS |
2 |
Keeps receiver 1 alive while the LT1039 is in the shutdown mode. Leave BIAS open when not in use. |
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D1IN, D2IN, D3IN |
15, 13, |
Line driver inputs. Operate properly on TTL or CMOS levels. Output valid from VI = (VDD ±) + (2 to 15 V). |
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11 |
Connect to 5 V when not used. |
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D1OUT, D2OUT, |
4, 6, 8 |
Line driver outputs |
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D3OUT |
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GND |
10 |
Ground |
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ON/OFF |
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17 |
Shuts down entire circuit. Cannot be left open. If VIL is at or near 0.8 V, significant settling time may be required. |
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R1IN, R2IN, R3IN |
3, 5, 7 |
Receiver inputs. Input impedance is normally 30 kΩ. Accepts EIA-232 voltage levels and has 0.4 V of |
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hysteresis to provide noise immunity. |
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R1OUT, R2OUT, |
16, 14, |
Receiver outputs with TTL/CMOS voltage levels |
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R3OUT |
12 |
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VDD + |
1 |
Positive supply voltage for driver |
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VDD ± |
9 |
Negative supply voltage for driver |
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VCC |
18 |
5-V supply voltage for receivers |
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absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VDD + (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . 0 V to 15 V |
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Supply voltage range, VDD± . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . 0 V to ±15 V |
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Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . 7 |
V |
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Input voltage range, driver input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . VDD± to 25 |
V |
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receiver input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . ± 30 V |
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0 V to 12 |
V |
Input voltage range, ON/OFF |
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Output voltage range, driver output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
VDD+ ±30 V to VDD± + 30 |
V |
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Duration of output short circuit at (or below) TA = 25°C (to ± 30 V, see Note 2) . |
. . . . . . . . . . . . . . . . unlimited |
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Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
See Dissipation Rating Table |
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Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . 0°C to 70°C |
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Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . ±65°C to 150°C |
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Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . 260°C |
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NOTES: 1. All voltage values, except differential voltages, are with respect to the GND terminal.
2.The output may be shorted to either supply. Temperature and/or supply voltages must be limited to ensure that the maximum dissipation rating is not exceeded.
DISSIPATION RATING TABLE
PACKAGE |
TA ≤ 25°C |
DERATING FACTOR |
TA = 70°C |
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POWER RATING |
ABOVE TA = 25°C |
POWER RATING |
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DW |
1025 mW |
8.2 mW/°C |
656 mW |
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N |
1150 mW |
9.2 mW/°C |
736 mW |
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
2±3 |
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