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 Linear Technology Electronic Components Datasheet

LT1081 Datasheet

Advanced Low Power 5V RS232 Dual Driver/Receiver

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LT1080/LT1081
Advanced Low Power
5V RS232 Dual Driver/Receiver
FEATURES
s 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
s Absolutely No Latchup
s CMOS Comparable Low Power: 60mW
s Can Power Additional RS232 Drivers: 10mA
s Supply Current in Shutdown: 1µA
s Available in SO Package
s Available with or without Shutdown
U
APPLICATIO S
s Portable Computers
s Battery-Powered RS232 Systems
s Power Supply Generator
s Terminals
s Modems
DESCRIPTIO
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 real-
istic 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.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
2
1µF 4
1µF
LOGIC
INPUTS
LOGIC
OUTPUTS
ON/OFF
5
6
12
11
13
10
18
LT1080
17
3
7
15
8
14
5k
9
5k 16
5V INPUT
9V OUTPUT
1µF
–9V OUTPUT
1µF
RS232 OUTPUT
RS232 OUTPUT
RS232 INPUT
RS232 INPUT
1080/81 • TA01
Supply Generator Outputs
10
8 RL TO V–
6
V+ OUTPUT
RL TO GND
4
2
0 VCC = 5V
–2
–4
–6 RL TO V+
RL TO GND
–8
V– OUTPUT
–10
0 2 4 6 8 10 12 14 16 18
OUTPUT CURRENT (mA)
20
1080/81 TA01a
1


 Linear Technology Electronic Components Datasheet

LT1081 Datasheet

Advanced Low Power 5V RS232 Dual Driver/Receiver

No Preview Available !

LT1080/LT1081
ABSOLUTE AXI U 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 .......................... –55°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
NC 1
C1+ 2
V+ 3
C1– 4
C2+ 5
C2– 6
V– 7
TR2 OUT 8
REC2 IN 9
TOP VIEW
LT1080
18 ON/OFF
17 VCC
16 GND
15 TR1 OUT
14 REC1 IN
13 REC1 OUT
12 TR1 IN
11 TR2 IN
10 REC2 OUT
J PACKAGE
18-LEAD CERDIP
N PACKAGE
18-LEAD PDIP
SW PACKAGE
18-LEAD PLASTIC SO WIDE
TJMAX = 150°C, θJA = 100°C/W, θJC = 40°C/W (J)
TJMAX = 150°C, θJA = 120°C/W, θJC = 50°C/W (N)
TJMAX = 150°C, θJA = 90°C/W, θJC = 26°C/W (SW)
ORDER PART
NUMBER
LT1080CJ
LT1080CN
LT1080CSW
LT1080IN
LT1080ISW
LT1080MJ
TOP VIEW
C1+ 1
V+ 2
C1– 3
C2+ 4
C2– 5
V– 6
TR2 OUT 7
REC2 IN 8
LT1081
16 VCC
15 GND
14 TR1 OUT
13 REC1 IN
12 REC1 OUT
11 TR1 IN
10 TR2 IN
9 REC2 OUT
J PACKAGE
16-LEAD CERDIP
N PACKAGE
16-LEAD PDIP
SW PACKAGE
16-LEAD PLASTIC SO WIDE
TJMAX = 150°C, θJA = 100°C/W, θJC = 40°C/W (J)
TJMAX = 150°C, θJA = 120°C/W, θJC = 50°C/W (N)
TJMAX = 150°C, θJA = 95°C/W, θJC = 27°C/W (SW)
ORDER PART
NUMBER
LT1081CJ
LT1081CN
LT1081CSW
LT1081IN
LT1081ISW
LT1081MJ
2


Part Number LT1081
Description Advanced Low Power 5V RS232 Dual Driver/Receiver
Maker Linear Technology
Total Page 12 Pages
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