LT1039_08 [TI]
TRIPLE EIA-232 LINE TRANSCEIVER;
| 型号： | LT1039_08 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | TRIPLE EIA-232 LINE TRANSCEIVER |
| 文件： | 总7页 (文件大小：78K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
SLLS105B – D3627, FEBRUARY 1991 – REVISED JANUARY 1992
DW OR N PACKAGE
(TOP VIEW)
•
•
•
Meets All EIA-232-D (Revision of RS-232-C)
Specifications
Three Independent Drivers and Receivers
Per Package
V
V
CC
1
2
3
4
5
6
7
8
9
18
DD+
BIAS
R1IN
17 ON/OFF
16
15
14
13
12
11
10
R1OUT
D1IN
EIA-232 Inputs and Outputs Withstand
±30 V
D1OUT
R2IN
R2OUT
D2IN
•
•
•
3-State Outputs
D2OUT
R3IN
R3OUT
D3IN
All Outputs Are Short-Circuit Protected
D3OUT
Virtually Zero Supply Current When
Shutdown
V
GND
DD–
•
Output of Several Devices Can Be
Paralleled
•
•
Operates From ±5-V to ±15-V Supplies
Designed to Be Interchangeable With
Linear Technology LT1039
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
PACKAGE
T
A
SMALL OUTLINE
(DW)
PLASTIC DIP
(N)
0°C to 70°C
LT1039CDW
LT1039CN
The DW package is available taped and reeled. Add the suffix R to the
device type (i.e., LT1039CDWR).
Copyright 1992, Texas Instruments Incorporated
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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
SLLS105B – D3627, FEBRUARY 1991 – REVISED JANUARY 1992
†
logic symbol
17
ON/OFF
EN
2
BIAS
16
R1OUT
3
R1IN
14
12
15
13
5
R2OUT
R3OUT
D1IN
R2IN
7
R3IN
4
D1OUT
6
D2OUT
D2IN
11
8
D3IN
D3OUT
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram
17
2
ON/OFF
BIAS
3
5
7
4
16
14
12
15
R1OUT
R1IN
R2IN
R2OUT
R3OUT
D1IN
R3IN
D1OUT
6
8
13
11
D2OUT
D3OUT
D2IN
D3IN
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
SLLS105B – D3627, FEBRUARY 1991 – REVISED JANUARY 1992
Terminal Functions
PIN
DESCRIPTION
NAME
NO.
BIAS
2
Keeps receiver 1 alive while the LT1039 is in the shutdown mode. Leave BIAS open when not in use.
) + (2 to 15 V).
D1IN, D2IN, D3IN 15, 13, Line driver inputs. Operate properly on TTL or CMOS levels. Output valid from V = (V
I
DD–
11
Connect to 5 V when not used.
D1OUT, D2OUT,
D3OUT
4, 6, 8 Line driver outputs
GND
10
17
Ground
Shutsdownentirecircuit.Cannotbeleftopen.IfV isatornear0.8V,significantsettlingtimemayberequired.
ON/OFF
IL
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
hysteresis to provide noise immunity.
R1OUT, R2OUT,
R3OUT
16, 14, Receiver outputs with TTL/CMOS voltage levels
12
V
V
1
9
Positive supply voltage for driver
Negative supply voltage for driver
5-V supply voltage for receivers
DD+
DD–
V
18
CC
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
Supply voltage range, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to –15 V
DD+
DD–
Supply voltage, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage range, driver input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V to 25 V
DD–
receiver input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±30 V
Input voltage range, ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 12 V
Output voltage range, driver output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
–30 V to V
+ 30 V
DD+
DD–
Duration of output short circuit at (or below) T = 25°C (to ±30 V, see Note 2) . . . . . . . . . . . . . . . . . unlimited
A
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
A
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
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
T
≤ 25°C
DERATING FACTOR
T = 70°C
A
POWER RATING
A
PACKAGE
POWER RATING
ABOVE T = 25°C
A
DW
N
1025 mW
8.2 mW/°C
9.2 mW/°C
656 mW
1150 mW
736 mW
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
SLLS105B – D3627, FEBRUARY 1991 – REVISED JANUARY 1992
recommended operating conditions
MIN NOM
MAX
15
UNIT
V
Supply voltage, V
Supply voltage, V
Supply voltage, V
5
–5
12
–12
5
DD+
DD–
CC
–15
5.25
V
4.75
2
V
High-level input voltage, V (see Note 3)
IH
V
Low-level input voltage, V (see Note 3)
IL
0.8
70
V
Operating free-air temperature, T
0
°C
A
NOTE 3: V and V specifications apply only for inputs D1IN to D3IN.
IH IL
DRIVER SECTION
electrical characteristics over recommended operating free-air temperature range, V
to ±12.6 V, ON/OFF at 2.5 V (unless otherwise noted)
= ±11.4 V
DD
±
†
TYP
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
Maximum positive peak output
voltage swing
V
V
V
DD+
–0.4
V
V
–0.4
+1.0
OM+
DD+
Load = 3 kΩ to GND
V
Maximum negative peak output
voltage swing
V
DD–
+1.5
OM–
DD–
I
I
High-level input current
Low-level input current
V ≥ 2 V
1
5
20
20
15
80
µA
µA
IH
I
V ≤ 0.8 V
I
IL
V = 0
I
V = 5 V
I
Sourcing current,
Sinking current,
V
V
= 0
= 0
5
15
O
–5
–15
O
I
I
I
Off-state output current
Supply current
V
= ±18 V, V = 0, ON/OFF at 0.4 V
±10
4
±200
8
µA
mA
µA
OZ
O
I
I
O
= 0
CC
Off-state supply current
Slew rate
ON/OFF at 0.4 V
= 3 kΩ,
1
100
30
CC(off)
SR
R
C
= 51 pF
L
4
15
V/µs
L
†
All typical values are at V
= ±12 V, T = 25°C.
A
DD±
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LT1039
TRIPLE EIA-232 LINE TRANSCEIVER
SLLS105B – D3627, FEBRUARY 1991 – REVISED JANUARY 1992
RECEIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature, ON/OFF at 2.5 V (unless otherwise noted)
†
PARAMETER
TEST CONDITIONS
MIN TYP
MAX
UNIT
V
V
V
V
V
Negative-going input threshold voltage
Positive-going input threshold voltage
0.5
0.1
1.3
1.7
0.4
0.4
4.8
V
V
V
V
V
T–
T+
hys
OL
OH
2.8
1
Hysteresis (V
– V
)
T–
T+
Low-level output voltage
High-level output voltage
I
I
= –1.6 mA
0.5
O
= 160 µA
3.5
–10
0.5
O
Sinking current,
Sourcing current,
V
V
= V
= 0
O
CC
I
Short-circuit output current
mA
OS
1
O
Off-state (high-impedance state)
output current
I
V
O
= 0 to V
,
V = 0,
I
ON/OFF at 0.4 V
±1
±10
µA
OZ
CC
I
I
Supply current
I
= 0
4
1
7
mA
CC
O
Off-state supply current
ON/OFF at 0.4 V
= 5 V, T = 25°C.
100
µA
CC(off)
†
All typical values ground are at V
CC
A
2–5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–6
IMPORTANT NOTICE
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the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are
utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each
device is not necessarily performed, except those mandated by government requirements.
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Copyright 1998, Texas Instruments Incorporated
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