LT1039/LT1039-16
RS232 Driver/Receiver
with Shutdown
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Operates from
±5V
to
±15V
Supplies
Fully Protected Against Overload
Outputs Can Be Driven
±30V
Without Damage
Three-State Outputs; Outputs Open When Off
Bipolar Circuit—No Latchup
±30V
Input Range
Triple Driver/Receiver
No Supply Current in Shutdown
30kΩ Input Impedance
Meets All RS232 Specifications
16-Pin Version—Pin Compatible with MC145406
Available in SO Package
15kV ESD: LT1039A
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 and immune to latchup.
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 LT1080/LT1081, LT1180A/LT1181A and
LT1130A data sheets. For applications requiring 15kV
ESD, see the LT1039A.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
RS232 Interface
Terminals
Modems
TYPICAL APPLICATIO
12V
BIAS*
RS232 IN
1
2
3
V
+
LT1039
V
CC
18
17
16
5V
ON/OFF
LOGIC
V
+
POSITIVE
– 0.5
OUTPUT VOLTAGE (V)
30k
RS232 OUT
RS232 IN
4
5
30k
RS232 OUT
RS232 IN
6
7
30k
*BIAS PIN USED
RS232 OUT
TO KEEP THE
RECEIVER ON
– 12V
WHILE IN SHUTDOWN
8
9
V
–
15
14
LOGIC
LOGIC
1.5
NEGATIVE
1.0
13
12
LOGIC
LOGIC
0.5
11
GND
1039 TA01
LOGIC
V
–
0
2
10
U
Driver Output Swing
6
8
4
OUTPUT CURRENT (mA)
10
1039 TA02
U
U
1039fd
1
LT1039/LT1039-16
ABSOLUTE
MAXIMUM
RATINGS
Supply Voltage
Driver (V
+
, V
–
) ..................................................
±16V
Receiver (V
CC
) ....................................................... 7V
Logic Inputs ................................................... V
–
to 25V
Receiver Inputs ........................................................
±30
ON/OFF Input ............................................... GND to 12V
Driver Outputs ........................ (V
–
+ 30V) to (V
+
– 30V)
PACKAGE/ORDER INFORMATION
TOP VIEW
V
+
REC1 IN
TR1 OUT
REC2 IN
TR2 OUT
REC3 IN
TR3 OUT
V
–
1
2
3
4
5
6
7
8
16 V
CC
15 REC1 OUT
14 TR1 IN
13 REC2 OUT
12 TR2 IN
11 REC3 OUT
10 TR3 IN
9
GND
ORDER PART
NUMBER
LT1039CN16
LT1039CSW16
CONSULT FACTORY
FOR
AVAILABILITY
N PACKAGE
16-LEAD PDIP
SW PACKAGE
16-LEAD PLASTIC SO WIDE
T
JMAX
= 150°C,
θ
JA
= 140°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 150°C/ W (SW)
J PACKAGE
16-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (J)
LT1039MJ16
OBSOLETE PACKAGES
Consider the N Package for Alternate Source
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Output Voltage Swing
CONDITIONS
Load = 3k to Ground
Positive
Negative
Input Low Level (V
OUT
= High)
Input High Level (V
OUT
= Low)
V
IN
≥
2.0V
V
IN
≤
0.8V
Sourcing Current, V
OUT
= 0V
Sinking Current, V
OUT
= 0V
Shutdown (Notes 3, 4), V
OUT
=
±18V,
V
IN
= 0V
Shutdown (Note 3)
R
L
= 3k, C
L
= 51pF
V
OUT
= Low
q
q
ELECTRICAL CHARACTERISTICS
Driver V
+
= 12V, V
–
= – 12V, V
ON/OFF
= 2.5V (Note 2)
q
q
q
q
Logic Input Voltage Levels
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Supply Leakage Current
Slew Rate
Supply Current
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
V
+
BIAS
REC1 IN
TR1 OUT
REC2 IN
TR2 OUT
REC3 IN
TR3 OUT
V
–
1
2
3
4
5
6
7
8
9
18 V
CC
17 ON/OFF
16 REC1 OUT
15 TR1 IN
14 REC2 OUT
13 TR2 IN
12 REC3 OUT
11 TR3 IN
10 GND
SW PACKAGE
18-LEAD PLASTIC SO WIDE
ORDER PART
NUMBER
LT1039CN
LT1039CSW
LT1039IN
LT1039ISW
N PACKAGE
18-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 120°C/ W(N)
T
JMAX
= 150°C,
θ
JA
= 120°C/ W(SW)
J PACKAGE
18-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/ W(J)
LT1039CJ
LT1039MJ
MIN
TYP
MAX
UNITS
V
+
– 0.4
V
–
+ 1.5
2.0
V
+
– 0.1
V
–
+ 1.0
1.4
1.4
1
5
0.8
20
20
V
V
V
V
µA
µA
mA
mA
200
100
30
8
µA
µA
V/µs
mA
1039fd
5
–5
15
– 15
10 (25°C)
1 (25°C)
4
15
4
LT1039/LT1039-16
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Voltage
Output Short-Circuit Current
Output Leakage Current
Supply Current
Supply Leakage Current
ON/OFF Pin Current
Shutdown (Note 3)
0V
≤
V
ON/OFF
≤
5V
Output Low, I
OUT
= – 1.6mA
Output High, I
OUT
= 160µA
Sourcing Current, V
OUT
= 0V (Note 5)
Sinking Current, V
OUT
= V
CC
Shutdown (Note 2), 0V
≤
V
OUT
≤
V
CC
, V
IN
= 0V
CONDITIONS
Input Low Level (V
OUT
= High)
Input High Level (V
OUT
= Low)
q
q
q
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
MIN
0.5
0.1
TYP
1.3
1.7
0.4
30
0.4
4.8
1
1
4
1 (25°C)
MAX
UNITS
V
V
V
kΩ
V
V
mA
mA
Receiver V
CC
= 5V, V
ON/OFF
= 2.5V (Note 2)
2.8
1.0
0.5
3.5
0.5
–10
10
7
100
80
µA
mA
µA
µA
– 15
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 350µA max.
Note 5:
For T
A
≤
– 25°C, output source current is 0.4mA.
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Short-Circuit Current
50
45
40
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
35
30
25
20
15
10
5
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
SOURCING
SINKING
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
INPUT LOW
INPUT HIGH
ON/OFF PIN VOLTAGE (V)
U W
1039 G01
Receiver Input Thresholds
3.00
2.75
2.50
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
ON/OFF Pin Thresholds
MINIMUM ON VOLTAGE
MINIMUM OFF VOLTAGE
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1039 G02
1039 G03
1039fd
3
LT1039/LT1039-16
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current in Shutdown
1000
SUPPLY CURRENT MEASURED
INTO V
CC
AND V
+
SUPPLY CURRENT (nA)
OUTPUT LEAKAGE CURRENT (µA)
100
100
OUTPUT CURRENT (mA)
10
1
–55 –25
0
25
50
75
TEMPERATURE (°C)
ON/OFF Pin Current vs Voltage
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
40
35
30
V
+
– 0.2
– 0.4
INPUT CURRENT (µA)
25
20
15
10
5
0
–5
–10
0
1
2
3
INPUT VOLTAGE (V)
4
5
1039 G07
Output Waveforms
RECEIVER
OUTPUT
5V
0V
10V
0V
DRIVER
OUTPUT – 10V
5V
INPUT
0V
V
+
= 12V
V
–
= –12V
V
CC
= 5V
R
L
= 3k
2µs/DIV
1039 G09
DRIVER OUTPUT CONNECTED TO RECEIVER INPUT
4
U W
100
1039 G04
Driver Output Leakage
in Shutdown
1000
100
Receiver Output
Short-Circuit Current
OUTPUT SINKING
10
10
V
OUT
– 30V
OUTPUT SOURCING
1
V
OUT
30V
1
–55 –25
0
25
50
75
TEMPERATURE (°C)
100
125
0.1
–55 –25
0
25
50
75
TEMPERATURE (°C)
100
125
125
1039 G05
1039 G06
Driver Output Swing vs Current
OUTPUT HIGH
1.2
1.0
0.8
0.6
0.4
0.2
V
–
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT CURRENT (mA)
1039 G08
OUTPUT LOW
Shutdown to Driver Output
10V
DRIVER
OUTPUT
5V
0V
0V
DRIVER
OUTPUT
ON/OFF
INPUT
– 5V
– 10V
5V
0V
V
+
= 12V
V
–
= –12V
R
L
= 3k
1ms/DIV
1039 G10
OUTPUT
HIGH
OUTPUT
LOW
1039fd
LT1039/LT1039-16
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown to Receiver Output
6V
RECEIVER 4V
OUTPUT 2V
0V
6V
RECEIVER 1 4V
OUTPUT 2V
0V
ON/OFF 5V
INPUT 0V
V
CC
= 5V
1ms/DIV
1039 G11
PIN FUNCTIONS
(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 30kΩ.
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.
U W
BIAS Pin Response Time
BIAS INPUT 5V
(THRU 25kΩ) 0V
V
CC
= 5V
0.2µs/DIV
1039 G12
U
U
U
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.
1039fd
5
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