1
LT1039/LT1039-16
RS232 Driver/Receiver
with Shutdown
The LT
®
1039 is a triple RS232 driver/receiver that in-
cludes 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. Bipolar cir-
cuitry makes this driver/receiver exceptionally rugged
against overloads or ESD damage.
A BIAS pin allows one receiver to be kept on while the rest
of the part is shut down.
The LT1039 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 LT1080A/LT1081A, LT1180A/LT1181A
and LT1130A data sheets. For applications requiring
15kV ESD, see the LT1039A.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Operates from
±
5V to
±
15V Supplies
s
Fully Protected Against Overload
s
Outputs Can Be Driven
±
30V Without Damage
s
Three-State Outputs; Outputs Open When Off
s
Bipolar Circuit--No Latchup
s
±
30V Input Range
s
Triple Driver/Receiver
s
No Supply Current in Shutdown
s
30k
Input Impedance
s
Meets All RS232 Specifications
s
16-Pin Version--Pin Compatible with MC145406
s
Available in SO Package
s
15kV ESD: LT1039A
s
RS232 Interface
s
Terminals
s
Modems
Driver Output Swing
30k
LT1039
V
+
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
V
CC
V
GND
12V
BIAS*
RS232 IN
ON/OFF
5V
LOGIC
LOGIC
LOGIC
LOGIC
LOGIC
LOGIC
*BIAS PIN USED
TO KEEP THE
RECEIVER ON
WHILE IN SHUTDOWN
RS232 IN
RS232 OUT
RS232 OUT
RS232 OUT
RS232 IN
12V
1039 TA01
30k
30k
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
0.5
V
+
8
1039 TA02
0.5
1.0
1.5
V
2
4
6
10
NEGATIVE
POSITIVE
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1039/LT1039-16
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
Supply Voltage
Driver (V
+
, V
) .................................................
±
16V
Receiver (V
CC
) ...................................................... 7V
Logic Inputs .................................................. V
to 25V
Receiver Inputs .....................................................
±
30V
ON/OFF Input .............................................. GND to 12V
Driver Outputs ....................... (V
+ 30V) to (V
+
30V)
Short-Circuit Duration ..................................... Indefinite
Operating Temperature Range
LT1039C .................................................. 0
°
C to 70
°
C
LT1039I ............................................. 40
°
C to 85
°
C
LT1039M ......................................... 55
°
C to 125
°
C
Storage Temperature Range ................. 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec).................. 300
°
C
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
ORDER PART
NUMBER
ORDER PART
NUMBER
LT1039CN16
LT1039CSW16
LT1039MJ16
1
2
3
4
5
6
7
8
TOP VIEW
N PACKAGE
16-LEAD PDIP
SW PACKAGE
16-LEAD PLASTIC SO WIDE
J PACKAGE
16-LEAD CERDIP
16
15
14
13
12
11
10
9
V
+
REC1 IN
TR1 OUT
REC2 IN
TR2 OUT
REC3 IN
TR3 OUT
V
V
CC
REC1 OUT
TR1 IN
REC2 OUT
TR2 IN
REC3 OUT
TR3 IN
GND
LT1039CJ
LT1039CN
LT1039CSW
LT1039IN
LT1039ISW
LT1039MJ
1
2
3
4
5
6
7
8
9
TOP VIEW
SW PACKAGE
18-LEAD PLASTIC SO WIDE
J PACKAGE
18-LEAD CERDIP
N PACKAGE
18-LEAD PDIP
18
17
16
15
14
13
12
11
10
V
+
BIAS
REC1 IN
TR1 OUT
REC2 IN
TR2 OUT
REC3 IN
TR3 OUT
V
V
CC
ON/OFF
REC1 OUT
TR1 IN
REC2 OUT
TR2 IN
REC3 OUT
TR3 IN
GND
T
JMAX
= 150
°
C,
JA
= 100
°
C/ W (J)
T
JMAX
= 150
°
C,
JA
= 140
°
C/ W (N)
T
JMAX
= 150
°
C,
JA
= 150
°
C/ W (SW)
T
JMAX
= 150
°
C,
JA
= 100
°
C/ W(J)
T
JMAX
= 150
°
C,
JA
= 120
°
C/ W(N)
T
JMAX
= 150
°
C,
JA
= 120
°
C/ W(SW)
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Driver V
+
= 12V, V
= 12V, V
ON/OFF
= 2.5V (Note 2)
Output Voltage Swing
Load = 3k to Ground
Positive
q
V
+
0.4
V
+
0.1
V
Negative
q
V
+ 1.5
V
+ 1.0
V
Logic Input Voltage Levels
Input Low Level (V
OUT
= High)
q
1.4
0.8
V
Input High Level (V
OUT
= Low)
q
2.0
1.4
V
Logic Input Current
V
IN
2.0V
1
20
µ
A
V
IN
0.8V
5
20
µ
A
Output Short-Circuit Current
Sourcing Current, V
OUT
= 0V
5
15
mA
Sinking Current, V
OUT
= 0V
5
15
mA
Output Leakage Current
Shutdown (Notes 3, 4), V
OUT
=
±
18V, V
IN
= 0V
q
10 (25
°
C)
200
µ
A
Supply Leakage Current
Shutdown (Note 3)
q
1 (25
°
C)
100
µ
A
Slew Rate
R
L
= 3k, C
L
= 51pF
4
15
30
V/
µ
s
Supply Current
V
OUT
= Low
4
8
mA
(Note 1)
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
°
C.
3
LT1039/LT1039-16
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Receiver V
CC
= 5V, V
ON/OFF
= 2.5V (Note 2)
Input Voltage Thresholds
Input Low Level (V
OUT
= High)
q
0.5
1.3
V
Input High Level (V
OUT
= Low)
q
1.7
2.8
V
Hysteresis
q
0.1
0.4
1.0
V
Input Resistance
q
30
k
Output Voltage
Output Low, I
OUT
= 1.6mA
q
0.4
0.5
V
Output High, I
OUT
= 160
µ
A
q
3.5
4.8
V
Output Short-Circuit Current
Sourcing Current, V
OUT
= 0V (Note 5)
q
0.5
1
mA
Sinking Current, V
OUT
= V
CC
q
10
mA
Output Leakage Current
Shutdown (Note 2), 0V
V
OUT
V
CC
, V
IN
= 0V
q
1
10
µ
A
Supply Current
q
4
7
mA
Supply Leakage Current
Shutdown (Note 3)
q
1 (25
°
C)
100
µ
A
ON/OFF Pin Current
0V
V
ON/OFF
5V
q
15
80
µ
A
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device by be impaired.
Note 2: V
ON/OFF
= 5V for LT1039M grade devices.
Note 3: V
ON/OFF
= 0.4V for 55
°
C
T
A
100
°
C and V
ON/OFF
= 0.2V for
100
°
C
T
A
125
°
C. Does not apply to LT1039-16 part.
Note 4: For T
A
100
°
C, leakage current is 350
µ
A max.
Note 5: For T
A
25
°
C, output source current is 0.4mA.
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
Driver Output Short-Circuit Current
ON/OFF Pin Thresholds
Receiver Input Thresholds
TEMPERATURE (
°
C)
55
0
OUTPUT CURRENT (mA)
5
15
20
25
50
35
0
50
75
1039 G01
10
40
45
30
25
25
100
125
SINKING
SOURCING
TEMPERATURE (
°
C)
55
0.50
INPUT VOLTAGE (V)
0.75
1.25
1.50
1.75
3.00
2.25
0
50
75
1039 G02
1.00
2.50
2.75
2.00
25
25
100
125
INPUT HIGH
INPUT LOW
TEMPERATURE (
°
C)
55
0
ON/OFF PIN VOLTAGE (V)
0.5
1.5
2.0
2.5
5.0
3.5
0
50
75
1039 G03
1.0
4.0
4.5
3.0
25
25
100
125
MINIMUM ON VOLTAGE
MINIMUM OFF VOLTAGE
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
°
C.
4
LT1039/LT1039-16
2
µ
s/DIV
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
Supply Current in Shutdown
Driver Output Leakage
in Shutdown
Receiver Output
Short-Circuit Current
ON/OFF Pin Current vs Voltage
Driver Output Swing vs Current
Output Waveforms
Shutdown to Driver Output
5V
0V
0V
INPUT
1039 G09
V
+
= 12V
V
= 12V
V
CC
= 5V
R
L
= 3k
0V
5V
10V
10V
5V
0V
0V
5V
ON/OFF
INPUT
V
+
= 12V
V
= 12V
R
L
= 3k
1ms/DIV
OUTPUT
HIGH
OUTPUT
LOW
1039 G10
TEMPERATURE (
°
C)
55
25
SUPPLY CURRENT (nA)
10
100
1000
0
25
50
75
100
125
1039 G04
1
SUPPLY CURRENT MEASURED
INTO V
CC
AND V
+
TEMPERATURE (
°
C)
55
25
OUTPUT LEAKAGE CURRENT (
µ
A)
10
100
1000
0
25
50
75
100
125
1039 G05
1
V
OUT
30V
V
OUT
30V
TEMPERATURE (
°
C)
55
25
OUTPUT CURRENT (mA)
1
10
100
0
25
50
75
100
125
1039 G06
0.1
OUTPUT SINKING
OUTPUT SOURCING
INPUT VOLTAGE (V)
0
INPUT CURRENT (
µ
A)
20
30
40
1039 G07
10
0
15
25
35
5
5
10
2
4
1
3
5
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
0.4
V
+
4.0
1039 G08
0.8
1.0
0.2
1.2
0.6
0.4
0.2
V
1.0
2.0
3.0
0.5
4.5
1.5
2.5
3.5
5.0
OUTPUT HIGH
OUTPUT LOW
RECEIVER
OUTPUT
DRIVER
OUTPUT
DRIVER
OUTPUT
DRIVER
OUTPUT
0V
10V
10V
5V
DRIVER OUTPUT CONNECTED TO RECEIVER INPUT
5
LT1039/LT1039-16
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
Shutdown to Receiver Output
BIAS Pin Response Time
PI
N
FU
N
CTIO
N
S
U
U
U
(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
= 0V.
BIAS (Pin 2): Keeps receiver 1 on while the LT1039 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 RS232
voltage levels (
±
30V) and has 0.4V of hysteresis to pro-
vide noise immunity. Input impedance is nominally 30k
.
TR OUT (Pins 4, 6, 8): Driver Outputs with RS232 Voltage
Levels. Outputs are in a high impedance state when in the
shutdown mode or when power is off (V
+
and V
= 0V) to
allow data line sharing. Outputs are fully short-circuit
protected from V
+ 30V to V
+
30V with power on, off or
in the shutdown mode. Typical output breakdowns are
greater than
±
45V and higher applied voltages will not
damage the device if moderately current limited.
GND (Pin 10): Ground Pin.
TR IN (Pins 11, 13, 15): RS232 Driver Input Pins. Inputs
are TTL/CMOS compatible. Inputs should not be allowed
to float. Tie unused inputs to V
CC
.
REC OUT (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.
ON/OFF (Pin 17): Controls the operation mode of the
LT1039 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): 5V Power for Receivers.
6V
4V
2V
0V
RECEIVER
OUTPUT
5V
0V
ON/OFF
INPUT
1ms/DIV
1039 G11
V
CC
= 5V
5V
BIAS INPUT
(THRU 25k
)
0.2
µ
s/DIV
1039 G12
V
CC
= 5V
0V
2V
4V
6V
RECEIVER 1
OUTPUT
0V
PDF 
ZIP