1
LT1039A/LT1039A-16
Triple RS232 Driver/Receiver
with Shutdown
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
0.8
V
+
4.0
1039A TA02
0.8
1.2
1.6
2.0
0.4
1.2
0.4
V
1.0
2.0
3.0
0.5
4.5
1.5
2.5
3.5
5.0
Driver Output Swing
30k
LT1039A
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
**50
RESISTORS
MAY BE REQUIRED
FOR IEC-1000-4-2
ESD PROTECTION
DEPENDING UPON
PC BOARD AND
CONNECTOR LEAD LENGTH
RS232 IN
RS232 OUT
RS232 OUT
RS232 OUT
RS232 IN
12V
1039A TA01
30k
30k
50
**
50
**
50
**
s
On-Chip ESD Protection:
15kV Human Body Model
15kV IEC-1000-4-2 Air Gap Test**
8kV IEC-1000-4-2 Contact Test
s
125kBd Operation with 3k
/2500pF Load
s
250kBd Operation with 3k
/1000pF Load
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
FEATURES
DESCRIPTIO
N
U
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.
APPLICATIO
N
S
U
s
RS232 Interface
s
Terminals
s
Modems
TYPICAL APPLICATIO
N
U
2
LT1039A/LT1039A-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
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 I
N
FOR
M
ATIO
N
W
U
U
ORDER PART
NUMBER
ORDER PART
NUMBER
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
= 88
C/ W,
JC
= 22
C/ W (J)
T
JMAX
= 125
C,
JA
= 79
C/ W,
JC
= 36
C/ W (N)
T
JMAX
= 125
C,
JA
= 90
C/ W,
JC
= 26
C/ W (SW)
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
T
JMAX
= 150
C,
JA
= 105
C/ W,
JC
= 30
C/ W (J)
T
JMAX
= 125
C,
JA
= 90
C/ W,
JC
= 50
C/ W (N)
T
JMAX
= 125
C,
JA
= 95
C/ W,
JC
= 27
C/ W (SW)
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Driver V
+
= 12V, V
= 12V, V
ON/OFF
= 2.5V (Note 1)
Output Voltage Swing
Load = 3k to Ground
Positive
q
V
+
2.0
V
+
1.3
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
A
V
IN
0.8V
5
20
A
Output Short-Circuit Current
Sourcing Current, V
OUT
= 0V
20
30
mA
Sinking Current, V
OUT
= 0V
15
30
mA
Output Leakage Current
Shutdown (Notes 2, 3), V
OUT
=
18V, V
IN
= 0V
q
10
200
A
Supply Leakage Current
Shutdown (Note 2)
q
1
100
A
Slew Rate
R
L
= 3k, C
L
= 51pF to 2500pF
4
15
30
V/
s
Supply Current
V
OUT
= Low
1
5
mA
LT1039ACN
LT1039ACSW
LT1039AIN
LT1039AISW
LT1039AMJ
LT1039ACN16
LT1039ACSW16
LT1039AIN16
LT1039AISW16
LT1039AMJ16
Consult Factory
for Availability
3
LT1039A/LT1039A-16
ELECTRICAL CHARACTERISTICS
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.
Note 3: For T
A
100
C leakage current is 350
A max.
Note 4: Bias pin open on 18-pin version.
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
TEMPERATURE (
C)
55
0
OUTPUT CURRENT (mA)
5
15
20
25
50
35
0
50
75
1039A G01
10
40
45
30
25
25
100
125
SINKING
SOURCING
Driver Output Short-Circuit Current
TEMPERATURE (
C)
55
0
ON/OFF PIN VOLTAGE (V)
0.5
1.5
2.0
2.5
5.0
3.5
0
50
75
1039A G03
1.0
4.0
4.5
3.0
25
25
100
125
MINIMUM ON VOLTAGE
MINIMUM OFF VOLTAGE
ON/OFF Pin Thresholds
TEMPERATURE (
C)
55
0.50
INPUT VOLTAGE (V)
0.75
1.25
1.50
1.75
3.00
2.25
0
50
75
1039A G02
1.00
2.50
2.75
2.00
25
25
100
125
INPUT HIGH
INPUT LOW
Receiver Input Thresholds
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Prop Delay (t
PLH
)
0.6
1.2
s
(t
PHL
)
0.8
1.2
s
Receiver V
CC
= 5V, V
ON/OFF
= 2.5V (Note 1)
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
A
q
3.5
4.8
V
Output Short-Circuit Current
Sourcing Current, V
OUT
= V
CC
q
10
30
mA
Sinking Current, V
OUT
= 0V
q
15
25
mA
Output Leakage Current
Shutdown (Note 1), 0V
V
OUT
V
CC
, V
IN
= 0V
q
1
10
A
Supply Current
(Note 4)
q
2
5
mA
Supply Leakage Current
Shutdown (Note 2)
q
1
100
A
ON/OFF Pin Current
0V
V
ON/OFF
5V
q
15
80
A
Prop Delay (t
PLH
)
200
600
ns
(t
PHL
)
300
600
ns
4
LT1039A/LT1039A-16
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
TEMPERATURE (
C)
55
25
SUPPLY CURRENT (nA)
10
100
1000
0
25
50
75
100
125
1039A G04
1
SUPPLY CURRENT MEASURED
INTO V
CC
AND V
+
Supply Current in Shutdown
TEMPERATURE (
C)
55
0
OUTPUT CURRENT (mA)
5
15
20
25
50
55
60
35
0
50
75
1039A G06
10
40
45
30
25
25
100
125
SINKING
SOURCING
TEMPERATURE (
C)
55
25
OUTPUT LEAKAGE CURRENT (
A)
10
100
1000
0
25
50
75
100
125
1039A G05
1
V
OUT
30V
V
OUT
30V
Driver Output Leakage
in Shutdown
Receiver Output
Short-Circuit Current
INPUT VOLTAGE (V)
0
INPUT CURRENT (
A)
20
30
40
1039A G07
10
0
15
25
35
5
5
10
2
4
1
3
5
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE REFERRED TO SUPPLIES (V)
0.8
V
+
4.0
1039A TA02
0.8
1.2
1.6
2.0
0.4
1.2
0.4
V
1.0
2.0
3.0
0.5
4.5
1.5
2.5
3.5
5.0
ON/OFF Pin Current vs Voltage
Driver Output Swing vs Current
Output Waveforms
Shutdown to Driver Output
5V
0V
RECEIVER
OUTPUT
10V
0V
10V
DRIVER
OUTPUT
5V
0V
INPUT
1039A G09
V
+
= 12V
V
= 12V
V
CC
= 5V
R
L
= 3k
0V
5V
10V
DRIVER
OUTPUT
10V
5V
0V
DRIVER
OUTPUT
0V
5V
ON/OFF
INPUT
2
s/DIV
V
+
= 12V
V
= 12V
R
L
= 3k
2
s/DIV
OUTPUT
HIGH
OUTPUT
LOW
1039A G10
DRIVER OUTPUT CONNECTED TO RECEIVER INPUT
5
LT1039A/LT1039A-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 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 30k
.
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 0.1
F 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
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. 0.1
F 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.
6V
4V
2V
0V
RECEIVER
OUTPUT
5V
0V
ON/OFF
INPUT
2ms/DIV
1039A G11
V
CC
= 5V
5V
BIAS INPUT
(THRU 25k
)
0.2
s/DIV
1039A G12
V
CC
= 5V
0V
2V
4V
6V
RECEIVER 1
OUTPUT
0V
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