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PDF LT1081CSW Data sheet ( Hoja de datos )
| Número de pieza | LT1081CSW | |
| Descripción | Advanced Low Power 5V RS232 Dual Driver/Receiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Input Thresholds
3.00
2.75
2.50
2.25
INPUT HIGH
2.00
1.75
1.50
1.25 INPUT LOW
1.00
0.75
0.50
–55 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1080/81 G04
Receiver Output
Short-Circuit Current
100
OUTPUT SINKING
10
OUTPUT SOURCING
1
0.1
–55 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1080/81 G05
ON/OFF Pin Thresholds
5.0
4.5
4.0
3.5
3.0
2.5
2.0 MINIMUM ON VOLTAGE
1.5
1.0
MAXIMUM OFF VOLTAGE
0.5
0
–55 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1080/81 G07
Supply Current in Shutdown
1000
VCC = 5V
100
10
1
–55 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1080/81 G08
LT1080/LT1081
ON/OFF Pin Current vs Voltage
40
35
30
25
20
15
10
5
0
–5
–10
0
1234
INPUT VOLTAGE (V)
5
1080/81 G06
Driver Output Leakage in
Shutdown
100
10
VOUT = 30V
1
0.1
–55 –25
VOUT = –30V
0 25 50 75
TEMPERATURE (°C)
100 125
1080/81 G09
Output Waveforms
Shutdown to Driver Output
Shutdown to Receiver Output
5V
DRIVER 0V
OUTPUT –5V
RECEIVER 5V
OUTPUT 0V
INPUT
5V
0V
0
VCC = 5V
RL = 3k
2µs
4µs
DRIVER 10V
OUTPUT 5V
HIGH 0V
RECEIVER 0V
OUTPUT –5V
LOW –10
6µs
8µs
1080/81 G10.tiff
ON/OFF 5V
INPUT 0V
0
VCC = 5V
RL = 3k
1ms
2ms
3ms
4ms
1080/81 G11.tiff
RECEIVER
OUTPUT
6V
4V
2V
0V
ON/OFF 5V
INPUT 0V
0 1ms
VCC = 5V
2ms
3ms
4ms
1080/81 G11.tiff
5
5 Page 
LT1080/LT1081
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
SW Package
18-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.447 – 0.463*
(11.354 – 11.760)
18 17 16 15 14 13 12 11 10
SEE NOTE
0.394 – 0.419
(10.007 – 10.643)
0.291 – 0.299**
(7.391 – 7.595)
0.010
(0.254
–
–
0.029
0.737)
×
45°
123 45678 9
0.093 – 0.104
(2.362 – 2.642)
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.050
0.009 – 0.013
(0.229 – 0.330)
NOTE:
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
TYP
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
*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
0.004 – 0.012
(0.102 – 0.305)
S18 (WIDE) 0396
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1081CSW.PDF ] | |
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