LINER LT1080 Advanced low power 5v rs232 dual driver/receiver Datasheet

LT1080/LT1081
Advanced Low Power
5V RS232 Dual Driver/Receiver
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DESCRIPTIO
FEATURES
■
■
■
■
■
■
■
Superior to CMOS
– Improved Speed: Operates over 120kBaud
– Improved Protection: Outputs Can Be Forced
to ±30V without Damage
– Three-State Outputs Are High
Impedance When Off
– Only Needs 1µF Capacitors
Absolutely No Latchup
CMOS Comparable Low Power: 60mW
Can Power Additional RS232 Drivers: 10mA
Supply Current in Shutdown: 1µA
Available in SO Package
Available with or without Shutdown
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APPLICATIO S
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■
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For applications requiring up to five drivers and five
receivers with charge pump in one package see the LT1130A
Series data sheet. A version of the LT1080/LT1081, the
LT1180A and LT1181A that use only 0.1µF capacitors, is
also available. All of Linear Technology’s RS232 ICs are
available in standard surface mount packages.
Portable Computers
Battery-Powered RS232 Systems
Power Supply Generator
Terminals
Modems
, LTC and LT are registered trademarks of Linear Technology Corporation.
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The LT®1080/LT1081 are the only dual RS232 driver/
receiver with charge pump to guarantee absolutely no
latchup. These interface optimized devices provide a realistic balance between CMOS levels of power dissipation
and real world requirements for ruggedness. The driver
outputs are fully protected against overload and can be
shorted to ±30V. Unlike CMOS, the advanced architecture
of the LT1080/LT1081 does not load the signal line when
“shut down” or when power is off. Both the receiver and
RS232 outputs are put into a high impedance state. An
advanced output stage allows driving higher capacitive
loads at higher speeds with exceptional ruggedness
against ESD.
TYPICAL APPLICATIO
17
4
3
5
LOGIC
INPUTS
–9V OUTPUT
1µF
6
15
11
8
13
14
RS232 OUTPUT
RS232 OUTPUT
RS232 INPUT
18
9
5k
V + OUTPUT
RL TO V –
6
2
VCC = 5V
0
–2
–4
V – OUTPUT
–10
0
16
1080/81 • TA01
RL TO GND
RL TO V +
–8
RS232 INPUT
RL TO GND
4
–6
5k
10
ON/OFF
10
8
7
12
LOGIC
OUTPUTS
Supply Generator Outputs
9V OUTPUT
1µF
LT1080
1µF
5V INPUT
OUTPUT VOLTAGE (V)
1µF
2
2
4
6 8 10 12 14 16 18 20
OUTPUT CURRENT (mA)
1080/81 TA01a
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LT1080/LT1081
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ABSOLUTE
RATI GS
(Note 1)
Supply Voltage (VCC) ................................................. 6V
V + ........................................................................................... 12V
V – ....................................................................................... –12V
Input Voltage
Driver ........................................................... V – to V +
Receiver ................................................. –30V to 30V
ON/OFF Pin .............................................. GND to 12V
Output Voltage
Driver ................................. (V – + 30V) to (V + – 30V)
Receiver .................................. –0.3V to (VCC + 0.3V)
Short-Circuit Duration
V + ...................................................................................... 30 sec
V – ...................................................................................... 30 sec
Driver Output ............................................... Indefinite
Receiver Output ........................................... Indefinite
Operating Temperature Range
LT1080C/LT1081C ................................. 0°C to 70°C
LT1080I/LT1081I ................................ –40°C to 85°C
LT1080M/LT1081M (OBSOLETE) ... –55°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC
1
18 ON/OFF
C1+
2
17 VCC
V+
3
C1–
4
C2 +
5
14 REC1 IN
C2 –
6
13 REC1 OUT
ORDER PART
NUMBER
16 GND
LT1080
15 TR1 OUT
LT1080CN
LT1080CSW
LT1080IN
LT1080ISW
ORDER PART
NUMBER
TOP VIEW
C1+
1
16 VCC
V+
2
15 GND
C1–
3
C2 +
4
C2 –
5
12 REC1 OUT
–
14 TR1 OUT
LT1081
13 REC1 IN
V–
7
12 TR1 IN
6
11 TR1 IN
TR2 OUT
8
11 TR2 IN
TR2 OUT
7
10 TR2 IN
REC2 IN
9
10 REC2 OUT
REC2 IN
8
9
V
REC2 OUT
N PACKAGE
SW PACKAGE
16-LEAD PDIP
16-LEAD PLASTIC SO WIDE
TJMAX = 150°C, θJA = 120°C/W, θJC = 50°C/W (N)
TJMAX = 150°C, θJA = 95°C/W, θJC = 27°C/W (SW)
N PACKAGE
SW PACKAGE
18-LEAD PDIP 18-LEAD PLASTIC SO WIDE
TJMAX = 150°C, θJA = 120°C/W, θJC = 50°C/W (N)
TJMAX = 150°C, θJA = 90°C/W, θJC = 26°C/W (SW)
J PACKAGE
18-LEAD CERDIP
TJMAX = 150°C, θJA = 100°C/W, θJC = 40°C/W (J)
LT1081CN
LT1081CSW
LT1081IN
LT1081ISW
LT1080CJ
LT1080MJ
J PACKAGE
16-LEAD CERDIP
TJMAX = 150°C, θJA = 100°C/W, θJC = 40°C/W (J)
OBSOLETE PACKAGE
OBSOLETE PACKAGE
Consider N Package for Alternate Source
Consider N Package for Alternate Source
LT1081CJ
LT1081MJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
10801fe
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LT1080/LT1081
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
●
●
5
–5
7.3
–6.5
1.4
1.4
0.8
2
V
V
5
5
20
20
µA
µA
Driver
Output Voltage Swing
Load = 3k to GND Both Outputs
Positive
Negative
Logic Input Voltage Level
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
●
●
Logic Input Current
VIN ≥ 2V
VIN ≤ 0.8V
●
●
Output Short-Circuit Current
Sourcing Current, VOUT = 0V
Sinking Current, VOUT = 0V
Output Leakage Current
SHUTDOWN (Note 3), VOUT = ±30V
Data Rate (Note 6)
RL = 3k, CL = 2500pF
RL = 3k, CL = 1000pF
Slew Rate
RL = 3k, CL = 51pF
9
–9
12
–12
10
●
V
V
mA
mA
100
120
250
µA
kBd
kBd
4
15
0.8
0.2
1.3
1.3
30
V/µs
Receiver
Input Voltage Thresholds
Input Low Threshold
Commercial
Industrial and Military
●
●
Input High Threshold
Commercial
Industrial and Military
●
●
Hysteresis
●
Input Resistance
VIN = ±10V
Output Voltage
Output Low, IOUT = –1.6mA
Output High, IOUT = 160µA (VCC = 5V)
Output Short-Circuit Current
Sinking Current, VOUT = VCC
Sourcing Current, VOUT = 0V
Output Leakage Current
SHUTDOWN (Note 3), 0V ≤ VOUT ≤ VCC
●
●
0.1
V
V
1.7
1.7
2.4
3.0
V
V
0.4
1
V
kΩ
3
5
7
0.4
3.5
0.2
4.8
–10
0.6
–20
1
1
●
V
V
mA
mA
10
µA
Power Supply Generator (Note 4)
V + Output Voltage
IOUT = 0mA
IOUT = 10mA
IOUT = 15mA
8.0
7.0
6.5
9.0
8.0
7.5
V
V
V
V – Output Voltage
IOUT = 0mA
IOUT = –10mA
IOUT = –15mA
–7.5
–5.5
–5.0
–8.5
–6.5
–6.0
V
V
V
Supply Current
●
Supply Leakage Current (VCC)
SHUTDOWN (Note 3), LT1080 Only
●
ON/OFF Pin Current
0V ≤ VON/OFF ≤ 5V, LT1080 Only
●
Supply Rise Time
(Note 5), LT1080 Only
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: These parameters apply for 4.5V ≤ VCC ≤ 5.5V and VON/OFF = 3V,
unless otherwise specified.
Note 3: VON/OFF = 0.4V for –55°C ≤ TA ≤ 50°C, and VON/OFF = 0.2V for
50°C ≤ TA ≤ 125°C. (LT1080 only)
12
22
mA
1
100
µA
80
µA
–15
1
ms
Note 4: Unless otherwise specified, VCC = 5V, external loading of V + and
V – equals zero and the driver outputs are low (inputs high).
Note 5: Time from either SHUTDOWN high or power on until V + ≥ 6V and
V – ≤ –6V. All external capacitors are 1µF.
Note 6: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
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LT1080/LT1081
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PI FU CTIO S
(Pin numbers refer to LT1080)
C1+; C1–; C2+; C2 – (Pins 2, 4, 5, 6): Requires an external
capacitor (≥1µF) from C1 + to C1 – and another from C2 +
to C2 –. Pin 2 can be used for connecting a second positive
supply. When a separate positive supply is used, C1 can be
deleted.
V + (Pin 3): Positive Supply for RS232 Drivers.
V + ≈ 2VCC – 1.5V. Requires an exterenal capacitor (≥1µF)
for charge storage. May be loaded (up to 15mA) for
external system use. Loading does reduce V + voltage (see
graphs). Capacitor may be tied to ground or +5V input
supply. With multiple transceivers, the V + and V – pins may
be paralleled into common capacitors.
V – (Pin 7): Negative Supply for RS232 Drivers.
V – ≈ –(2VCC – 2.5V). Requires an external capacitor
(≥1µF) for charge stroage. May be loaded (up to –15mA)
for external system use. Loading does reduce V – voltage
(see graphs). With multiple transceivers, the V + and V –
pins may be paralleled into common capacitors.
TR2 OUT; TR1 OUT (Pins 8, 15): Driver Outputs with
RS232 Voltage Levels. Outputs are in a high impedance
state when in the SHUTDOWN mode or when power is off
(VCC = 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. Shorting one output will affect output from the
other.
REC2 IN; REC1 IN (Pins 9, 14): Receiver Inputs. Accepts
RS232 voltage levels (±30V) and has 0.4V of hysteresis to
provide noise immunity. Input impedance is nominally
5kΩ.
REC2 OUT; REC1 OUT (Pins 10, 13): 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 VCC with power on, off or in the SHUTDOWN
mode.
TR2 IN; TR1 IN (Pins 11, 12): RS232 Driver Input Pins.
Inputs are TTL/CMOS compatible. Inputs should not be
allowed to float. Tie unused inputs to VCC.
GND (Pin 16): Ground Pin.
VCC (Pin 17): Input Supply Pin. Supply current drops to
zero in the SHUTDOWN mode.
ON/OFF (Pin 18): Contols the operation mode of the
LT1080 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. A logic high fully
enables the device.
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TYPICAL PERFOR A CE CHARACTERISTICS
10
VCC = 5.5V
10
OUTPUT HIGH
4
VCC = 4.5V
2
0
RL = 3k
–2
–4
LOADED TO V –
6
VCC = 5V
VCC = 5V
VCC = 4.5V
VCC = 5V
–2
–4
–6
–8
–8
LOADED TO V +
1080/81 G01
LOADED TO GROUND
0
2
4
6
VCC = 5V
C1 TO C4 = 1µF
RL = 4.7k; V + TO V –
4
2
0
–2
–4
–6
–8
V – OUTPUT VOLTAGE
–10
125
LOADED TO GROUND
2
0
V + SUPPLY
8
4
–6
VCC = 5.5V
OUTPUT LOW
–10
–55 –25
0
25
50
75 100
TEMPERATURE (°C)
10
V + OUTPUT VOLTAGE
8
OUTPUT VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
8
6
Supply Generation from VCC
or Shutdown
Supply Generator Outputs
SUPPLY VOLTAGE (V)
Driver Output Voltage
V – SUPPLY
–10
6 8 10 12 14 16 18 20
OUTPUT CURRENT (mA)
1080/81 G02
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
TIME (ms)
1080/81 G03
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LT1080/LT1081
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TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Output
Short-Circuit Current
Receiver Input Thresholds
ON/OFF Pin Current vs Voltage
100
3.00
40
35
2.75
INPUT HIGH
2.00
1.75
1.50
INPUT LOW
1.25
INPUT CURRENT (µA)
2.25
30
OUTPUT SINKING
OUTPUT CURRENT (mA)
INPUT THRESHOLD (V)
2.50
10
OUTPUT SOURCING
1
20
15
10
5
1.00
0
0.75
–5
0.50
–55
–25
0
25
50
75
TEMPERATURE (°C)
100
0.1
–55
125
–10
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
ON/OFF Pin Thresholds
2
3
INPUT VOLTAGE (V)
4
5
1080/81 G06
Driver Output Leakage in
Shutdown
Supply Current in Shutdown
5.0
1
1080/81 G05
1080/81 G04
100
1000
VCC = 5V
OUTPUT LEAKAGE CURRENT (µA)
4.5
4.0
SUPPLY CURRENT (nA)
ON/OFF PIN VOLTAGE (V)
25
3.5
3.0
2.5
MINIMUM ON VOLTAGE
2.0
1.5
100
10
1.0
MAXIMUM OFF VOLTAGE
0.5
10
VOUT = 30V
1
VOUT = –30V
0
–55
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1
–55
–25
0
25
50
75
TEMPERATURE (°C)
1080/81 G07
5V
0V
–5V
DRIVER 10V
OUTPUT 5V
HIGH 0V
RECEIVER
OUTPUT
5V
0V
RECEIVER 0V
OUTPUT –5V
LOW –10
INPUT
5V
0V
ON/OFF
INPUT
4µs
6µs
8µs
1080/81 G10.tiff
–25
0
25
50
75
TEMPERATURE (°C)
5V
0V
0
VCC = 5V
RL = 3k
1ms
2ms
3ms
4ms
1080/81 G11.tiff
100
125
1080/81 G09
Shutdown to Driver Output
DRIVER
OUTPUT
2µs
125
1080/81 G08
Output Waveforms
0
VCC = 5V
RL = 3k
100
0.1
–55
Shutdown to Receiver Output
RECEIVER
OUTPUT
6V
4V
2V
0V
ON/OFF
INPUT
5V
0V
0
VCC = 5V
1ms
2ms
3ms
4ms
1080/81 G11.tiff
10801fe
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LT1080/LT1081
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APPLICATIO S I FOR ATIO
The driver output stage of the LT1080 offers significantly
improved protection over older bipolar and CMOS designs. In addition to current limiting, the driver output can
be externally forced to ±30V with no damage or excessive
current flow, and will not disrupt the supplies. Some
drivers have diodes connected between the outputs and
the supplies, so externally applied voltages can cause
excessive supply voltage to develop.
Placing the LT1080 in the SHUTDOWN mode (Pin 18 low)
puts both the driver and receiver outputs in a high impedance state. This allows data line sharing and transceiver
applications.
LT1080/LT1081 Driver
Transceiver
The SHUTDOWN mode also drops input supply current
(VCC; Pin 17) to zero for power-conscious systems.
LT1080 #1
DRIVER
30V
–30V
OUTPUT CAN
BE FORCED
EXTERNALLY
LOGIC
TRANSMIT/RECEIVE
LINE
1080/81 F01
RS232
TRANSMIT/RECEIVE
LINE
LT1080 #2
RECEIVER
Older RS232 Drivers and CMOS Drivers
V+
WITH SOME DRIVERS,
EXTERNALLY APPLIED
VOLTAGE CAN FORCE
THE SUPPLIES
V–
ON/OFF
(TRANSMIT/
RECEIVE)
INPUT
1080/81 F03
1080/81 F02
Sharing a Receiver Line
Sharing a Transmitter Line
LT1080 #1
RECEIVER
LT1080 #1
DRIVER
RS232
INPUT A
LOGIC
INPUT A
LT1080 #2
RECEIVER
RS232
INPUT B
ON/OFF
(CHANNEL
SELECT)
INPUT
LOGIC
INVERTER
LT1080 #2
DRIVER
LOGIC
OUTPUT
LOGIC
INVERTER
1080/81 F04
RS232
TRANSMISSION
LINE
LOGIC
INPUT B
ON/OFF
(CHANNEL
SELECT)
INPUT
LOGIC
INVERTER
1080/81 F05
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LT1080/LT1081
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APPLICATIO S I FOR ATIO
The generated driver supplies (V + and V –) may be used to
power external circuitry such as other RS232 drivers or op
amps. They should be loaded with care, since excessive
loading can cause the generated supply voltages to drop,
causing the RS232 driver output voltages to fall below
RS232 requirements. See the graph “Supply Generator
Outputs” for a comparison of generated supply voltage
versus supply current.
When driving CMOS logic from a receiver that will be used
in the SHUTDOWN mode and there is no other active
receiver on the line, a 51k resistor can be placed from the
logic input to VCC to force a definite logic level when the
receiver output is in a high impedance state.
VCC
LT1080
RECEIVER
51k*
RS232
INPUT
CMOS
LOGIC
LOGIC
OUTPUT
EXTERNAL OP AMP
+
3
1µF
LT1080
ON/OFF
INPUT
V+
DRIVER
* FORCES LOGIC INPUT STATE WHEN VON/OFF IS LOW
+
V+
1080/81 F06
–
To protect against receiver input overloads in excess of
±30V, a voltage clamp can be placed on the data line and
still maintain RS232 compatibility.
16
GND
V–
V–
7
1µF
RS232
INPUT
RECEIVER
1k*
1080/81 F08
30V
LOGIC
OUTPUT
5k
30V
* A PTC THERMISTOR WILL ALLOW
CONTINUOUS OVERLOAD OF GREATER THAN ±100V
1080/81 F067
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TYPICAL APPLICATIO
Operating with 5V and 12V
12V INPUT*
2
17
4
3
5V INPUT
LT1080
5
1µF
LOGIC
INPUTS
7
6
12
15
11
8
13
14
RS232 OUTPUT
RS232 OUTPUT
RS232 INPUT
5k
LOGIC
OUTPUTS
10
ON/OFF
–12V OUTPUT
1µF
18
* PIN 1 USED ON LT1081.
9
5k
RS232 INPUT
16
1080/81 • TA03
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LT1080/LT1081
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PACKAGE DESCRIPTIO
J Package
16-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
CORNER LEADS OPTION
(4 PLCS)
0.005
(0.127)
MIN
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.840
(21.336)
MAX
16
15
14
12
13
11
10
9
0.220 – 0.310
(5.588 – 7.874)
0.025
(0.635)
RAD TYP
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
2
1
3
5
4
6
7
8
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
0.015 – 0.060
(0.380 – 1.520)
0.008 – 0.018
(0.203 – 0.457)
0° – 15°
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
0.045 – 0.065
(1.143 – 1.651)
0.125
(3.175)
MIN
0.100
(2.54)
BSC
0.014 – 0.026
(0.360 – 0.660)
J16 1298
J Package
18-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
CORNER LEADS OPTION
(4 PLCS)
0.005
(0.127)
MIN
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.960
(24.384)
MAX
18
17
16
15
14
13
12
11
10
0.220 – 0.310
(5.590 – 7.870)
0.025
(0.635)
RAD TYP
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
1
2
3
4
5
6
7
8
9
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
0.015 – 0.060
(0.380 – 1.520)
0.008 – 0.018
(0.203 – 0.457)
0° – 15°
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
0.125
(3.175)
MIN
0.045 – 0.065
(1.143 – 1.651)
0.014 – 0.026
(0.360 – 0.660)
0.100
(2.54)
BSC
J18 1298
OBSOLETE PACKAGES
10801fe
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LT1080/LT1081
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PACKAGE DESCRIPTIO
N Package
16-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
0.255 ± 0.015*
(6.477 ± 0.381)
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
0.020
(0.508)
MIN
+0.035
0.325 –0.015
8.255
+0.889
–0.381
0.045 – 0.065
(1.143 – 1.651)
)
0.065
(1.651)
TYP
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.100
(2.54)
BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N16 1098
N Package
18-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.900*
(22.860)
MAX
18
17
16
15
14
13
12
11
10
1
2
3
4
5
6
7
8
9
0.255 ± 0.015*
(6.477 ± 0.381)
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
+0.035
0.325 –0.015
)
0.020
(0.508)
MIN
0.065
(1.651)
TYP
0.125
(3.175)
MIN
0.005
(0.127)
MIN
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
8.255
+0.889
–0.381
0.045 – 0.065
(1.143 – 1.651)
0.100
(2.54)
BSC
0.018 ± 0.003
(0.457 ± 0.076)
N18 1098
10801fe
9
LT1080/LT1081
U
PACKAGE DESCRIPTIO
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
0.398 – 0.413*
(10.109 – 10.490)
16
15
14
13
12
11 10
9
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
1
0.291 – 0.299**
(7.391 – 7.595)
2
3
4
5
6
7
0.093 – 0.104
(2.362 – 2.642)
0.010 – 0.029 × 45°
(0.254 – 0.737)
8
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
0.004 – 0.012
(0.102 – 0.305)
0.014 – 0.019
(0.356 – 0.482)
TYP
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
S16 (WIDE) 1098
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
10801fe
10
LT1080/LT1081
U
PACKAGE DESCRIPTIO
SW Package
18-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
0.447 – 0.463*
(11.354 – 11.760)
18
17
16
15
14
13
12
11
10
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.291 – 0.299**
(7.391 – 7.595)
1
2
3
4
5
6
7
8
9
0.093 – 0.104
(2.362 – 2.642)
0.010 – 0.029 × 45°
(0.254 – 0.737)
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
0.004 – 0.012
(0.102 – 0.305)
0.014 – 0.019
(0.356 – 0.482)
TYP
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
S18 (WIDE) 1098
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
10801fe
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT1080/LT1081
U
TYPICAL APPLICATIO
Supporting an LT1039 (Triple Driver/Receiver)
SHUTDOWN
5V
18
ON/OFF
VCC
LT1080
17
18
VCC
17
ON/OFF
LT1039
TTL INPUT
RS232 OUTPUT
TTL INPUT
RS232 OUTPUT
TTL INPUT
RS232 OUTPUT
TTL INPUT
RS232 OUTPUT
TTL INPUT
RS232 OUTPUT
RS232 INPUT
TTL OUTPUT
RS232 INPUT
TTL OUTPUT
5k
30k
RS232 INPUT
TTL OUTPUT
*C1
1µF
2
C1+
4
C1–
30k
RS232 INPUT
TTL OUTPUT
5
1µF
RS232 INPUT
TTL OUTPUT
5k
6
30k
C2 +
C2 –
V+
3
1
V+
V–
7
9
V–
GND
16
GND
1µF
1µF
10
1080/81 • TA02
*IN APPLICATIONS WHERE A SEPARATE SECOND POSITIVE SUPPLY IS AVAILABLE
(SUCH AS 5V AND 12V), THE 12V SUPPLY MAY BE CONNECTED TO PIN 2 AND
C1 DELETED. THE POWER SUPPLY CIRCUITRY WILL THEN INVERT THE 12V SUPPLY.
THE 5V SUPPLY IS STILL NEEDED TO POWER THE BIASING CIRCUITRY AND RECEIVERS.
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1180A/LT1181A
5V Low Power 2DR/2TX RS232 Transceiver
0.1µF Capacitors, 10kV ESD
LT1780/LT1781
5V Low Power 2DR/2TX RS232 Transceiver
15kV ESD
LT1381
5V Low Power 2DR/2TX RS232 Transceiver
16-Pin Narrow SO Package
LT1130A/LT1140A
5V RS232 Transceivers
Up to 5DR/5RX
LTC1383
5V Low Power 2DR/2RX RS232 Transceiver
Low Supply Current ICC = 220µA
LTC1386
3.3V Low Power EIA/TIA562 Transceiver
Low Supply Current ICC = 200µA
10801fe
12 Linear Technology Corporation
LT/CPI 1101 1.5K REV E • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 1991
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