LT1039A/LT1039A-16
Triple RS232 Driver/Receiver
with Shutdown
FEATURES
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DESCRIPTION
The LT
®
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 eliminates 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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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
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
APPLICATIONS
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RS232 Interface
Terminals
Modems
TYPICAL APPLICATION
12V
BIAS*
RS232 IN
50Ω**
RS232 OUT
RS232 IN
*BIAS PIN USED
50Ω**
TO KEEP THE
RS232 OUT
RECEIVER ON
WHILE IN SHUTDOWN
RS232 IN
**50Ω RESISTORS
MAY BE REQUIRED
50Ω**
FOR IEC-1000-4-2
RS232 OUT
ESD PROTECTION
DEPENDING UPON
– 12V
PC BOARD AND
CONNECTOR LEAD LENGTH
1
2
3
30k
4
5
30k
6
7
30k
8
9
V
–
V
+
LT1039A
V
CC
18
17
16
5V
ON/OFF
LOGIC
Driver Output Swing
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
V
+
– 0.4
– 0.8
–1.2
–1.6
– 2.0
15
14
LOGIC
LOGIC
13
12
LOGIC
LOGIC
1.2
0.8
0.4
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)
1039A TA02
11
GND
1039A TA01
LOGIC
10
U
U
U
1
LT1039A/LT1039A-16
ABSOLUTE
MAXIMUM
RATINGS
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
LT1039AC................................................ 0°C to 70°C
LT1039AI ........................................... – 40°C to 85°C
LT1039AM ....................................... – 55°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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
LT1039ACN16
LT1039ACSW16
LT1039AIN16
LT1039AISW16
LT1039AMJ16
Consult Factory
for Availability
J PACKAGE
16-LEAD CERDIP
N PACKAGE
16-LEAD PDIP
SW PACKAGE
16-LEAD PLASTIC SO WIDE
T
JMAX
= 150°C,
θ
JA
= 105°C/ W,
θ
JC
= 30°C/ W (J)
T
JMAX
= 125°C,
θ
JA
= 90°C/ W,
θ
JC
= 50°C/ W (N)
T
JMAX
= 125°C,
θ
JA
= 95°C/ W,
θ
JC
= 27°C/ W (SW)
ELECTRICAL CHARACTERISTICS
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 2, 3), V
OUT
=
±18V,
V
IN
= 0V
Shutdown (Note 2)
R
L
= 3k, C
L
= 51pF to 2500pF
V
OUT
= Low
q
q
Driver V
+
= 12V, V
–
= – 12V, V
ON/OFF
= 2.5V (Note 1)
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
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
N PACKAGE
18-LEAD PDIP
ORDER PART
NUMBER
LT1039ACN
LT1039ACSW
LT1039AIN
LT1039AISW
LT1039AMJ
J PACKAGE
18-LEAD CERDIP
SW PACKAGE
18-LEAD PLASTIC SO WIDE
T
JMAX
= 150°C,
θ
JA
= 88°C/ W,
θ
JC
= 22°C/ W (J)
T
JMAX
= 125°C,
θ
JA
= 79°C/ W,
θ
JC
= 36°C/ W (N)
T
JMAX
= 125°C,
θ
JA
= 90°C/ W,
θ
JC
= 26°C/ W (SW)
MIN
TYP
MAX
UNITS
V
+
– 2.0
V
–
+ 1.5
2.0
V
+
– 1.3
V
–
+ 1.0
1.4
1.4
1
5
0.8
20
20
V
V
V
V
µA
µA
mA
mA
200
100
30
5
µA
µA
V/µs
mA
20
– 15
30
– 30
10
1
4
15
1
LT1039A/LT1039A-16
ELECTRICAL CHARACTERISTICS
PARAMETER
Prop Delay (t
PLH
)
(t
PHL
)
Receiver V
CC
= 5V, V
ON/OFF
= 2.5V (Note 1)
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Voltage
Output Short-Circuit Current
Output Leakage Current
Supply Current
Supply Leakage Current
ON/OFF Pin Current
Prop Delay (t
PLH
)
(t
PHL
)
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
V
ON/OFF
= 5V for LT1039AM grade devices.
Note 2:
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 LT1039A-16 part.
Output Low, I
OUT
= – 1.6mA
Output High, I
OUT
= 160µA
Sourcing Current, V
OUT
= V
CC
Sinking Current, V
OUT
= 0V
Shutdown (Note 1), 0V
≤
V
OUT
≤
V
CC
, V
IN
= 0V
(Note 4)
Shutdown (Note 2)
0V
≤
V
ON/OFF
≤
5V
Input Low Level (V
OUT
= High)
Input High Level (V
OUT
= Low)
q
q
q
q
q
q
q
q
q
q
q
q
CONDITIONS
MIN
TYP
0.6
0.8
MAX
1.2
1.2
UNITS
µs
µs
V
V
V
kΩ
V
V
mA
mA
0.5
0.1
1.3
1.7
0.4
30
0.4
4.8
– 30
25
1
2
1
2.8
1.0
0.5
3.5
– 10
15
10
5
100
80
600
600
µA
mA
µA
µA
ns
ns
– 15
200
300
Note 3:
For T
A
≥
100°C leakage current is 350µA max.
Note 4:
Bias pin open on 18-pin version.
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Short-Circuit Current
50
45
40
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
35
30
25
20
15
10
5
SINKING
2.25
2.00
1.75
1.50
1.25
1.00
0.75
ON/OFF PIN VOLTAGE (V)
SOURCING
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
U W
100
1039A G01
Receiver Input Thresholds
3.00
2.75
2.50
INPUT HIGH
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
50
25
0
75
TEMPERATURE (°C)
100
125
ON/OFF Pin Thresholds
MINIMUM ON VOLTAGE
INPUT LOW
MINIMUM OFF VOLTAGE
125
0.50
–55 –25
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1039A G02
1039A G03
3
LT1039A/LT1039A-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
INPUT CURRENT (µA)
25
20
15
10
5
0
–5
–10
0
1
2
3
INPUT VOLTAGE (V)
4
5
1039A G07
Output Waveforms
RECEIVER
OUTPUT
DRIVER
OUTPUT
5V
0V
10V
0V
0V
DRIVER
OUTPUT
– 5V
– 10V
V
+
= 12V
V
–
= –12V
V
CC
= 5V
R
L
= 3k
2µs/DIV
1039A G09
–10V
5V
INPUT
0V
DRIVER OUTPUT CONNECTED TO RECEIVER INPUT
4
U W
100
1039A G04
Driver Output Leakage
in Shutdown
1000
60
55
50
45
40
35
30
25
20
15
10
5
Receiver Output
Short-Circuit Current
SINKING
10
V
OUT
– 30V
SOURCING
V
OUT
30V
1
–55 –25
0
25
50
75
TEMPERATURE (°C)
100
125
125
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1039A G05
1039A G06
Driver Output Swing vs Current
V
+
– 0.4
– 0.8
–1.2
–1.6
– 2.0
1.2
0.8
0.4
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)
1039A TA02
Shutdown to Driver Output
10V
DRIVER
OUTPUT
5V
0V
OUTPUT
LOW
OUTPUT
HIGH
ON/OFF
INPUT
5V
0V
V
+
= 12V
V
–
= –12V
R
L
= 3k
2µs/DIV
1039A G10
LT1039A/LT1039A-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
2ms/DIV
1039A 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 LT1309A 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.
Receiver input pins are internally protected from ESD
transients. In order to insure proper functioning of the ESD
protection devices, the V
CC
and V
–
supply pins must be
bypassed with low ESR capacitors located close to the
pins. A 0.1µF ceramic capacitor works well.
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. Driver
U W
BIAS Pin Response Time
BIAS INPUT 5V
(THRU 25kΩ) 0V
V
CC
= 5V
0.2µs/DIV
1039A G12
U
U
U
output pins are internally protected from ESD transients.
In order to insure proper functioning of the ESD protec-
tion devices, the V
+
and V
–
supply pins must be
bypassed with low ESR capacitors located close to the
pins. 0.1µF ceramic capacitors work well.
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
LT1039A 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.
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