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PDF LT1181AISW Data sheet ( Hoja de datos )
| Número de pieza | LT1181AISW | |
| Descripción | Low Power 5V RS232 Dual Driver/Receiver with 0.1uF Capacitors | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s ESD Protection over ±10kV
s Uses Small Capacitors: 0.1µF
s 120kBaud Operation for RL = 3k, CL = 2500pF
s 250kBaud Operation for RL = 3k, CL = 1000pF
s Outputs Withstand ±30V Without Damage
s CMOS Comparable Low Power: 40mW
s Operates from a Single 5V Supply
s Rugged Bipolar Design
s Outputs Assume a High Impedance State When Off
or Powered Down
s Meets All RS232 Specifications
s Available With or Without Shutdown
s Absolutely No Latch-up
s Available in SO Package
APPLICATI S
s Portable Computers
s Battery-Powered Systems
s Power Supply Generator
s Terminals
s Modems
TYPICAL APPLICATI
+
0.1µF
2
4
+
0.1µF
LOGIC
INPUTS
5
6
12
11
13
LOGIC
OUTPUTS
10
ON/OFF
18
LT1180A
17
5V INPUT
3
+
V+ OUT
0.1µF
7 V – OUT
+ 0.1µF
15 RS232 OUTPUT
8
14
5k
RS232 OUTPUT
RS232 INPUT
9
5k 16
RS232 INPUT
LT1180A • TA01
LT1180A/LT1181A
Low Power 5V RS232
Dual Driver/Receiver with
0.1µF Capacitors
DESCRIPTIO
The LT®1180A/LT1181A are dual RS232 driver/receiver
pairs with integral charge pump to generate RS232 volt-
age levels from a single 5V supply. These circuits feature
rugged bipolar design to provide operating fault tolerance
and ESD protection unmatched by competing CMOS
designs. Using only 0.1µF external capacitors, these cir-
cuits consume only 40mW of power, and can operate to
120k baud even while driving heavy capacitive loads. New
ESD structures on the chip allow the LT1180A/LT1181A to
survive multiple ±10kV strikes, eliminating the need for
costly TransZorbs® on the RS232 line pins. The LT1180A/
LT1181A are fully compliant with EIA RS232 standards.
Driver outputs are protected from overload, and can be
shorted to ground or up to ±30V without damage. During
shutdown or power-off conditions, driver and receiver
outputs are in a high impedance state, allowing line
sharing.
The LT1181A is available in 16-pin DIP and SO packages.
The LT1180A is supplied in 18-pin DIP and SO packages
for applications which require shutdown.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
RECEIVER
RCOL U=T5P0UpTF
INPUT
Output Waveforms
LT1180A • TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LT1180A/LT1181A
Receiver Short-Circuit Current
50
40
RX ISC–
30
RX ISC+
20
10
0
–55 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1180A • TPC10
Shutdown to Driver Outputs
10V
DRIVER 1 5V
OUTPUT
GND
GND
DRIVER 2 – 5V
OUTPUT
– 10V
ON/OFF PIN
LT1180A • TPC12
Slew Rate vs Load Capacitance
16
14
12
10
8
+SLEW
6
–SLEW
4
2
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
LOAD CAPACITANCE (nF)
LT1180A • TPC11
Driver Output Waveforms
DRIVER OUTPUT
RL = 3k
CL = 2500pF
DRIVER OUTPUT
RL = 3k
INPUT
LT1180A • TPC13
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor close to the package pin.
Insufficient supply bypassing can result in low output
drive levels and erratic charge pump operation.
GND: Ground Pin.
ON/OFF: A TTL/CMOS Compatible Operating Mode Con-
trol. A logic low puts the LT1180A in shutdown mode.
Supply current drops to zero and both driver and receiver
outputs assume a high impedance state. A logic high fully
enables the device.
V+: Positive Supply Output (RS232 Drivers). V+ ≈ 2VCC –
1.5V. This pin requires an external charge storage capaci-
tor C ≥ 0.1µF, tied to ground or VCC. Larger value capaci-
tors may be used to reduce supply ripple. With multiple
transceivers, the V+ and V – pins may be paralleled into
common capacitors.
V–: Negative Supply Output (RS232 Drivers). V– ≈ –(2VCC
– 2.5V). This pin requires an external charge storage
capacitor C ≥ 0.1µF. Larger value capacitors may be used
to reduce supply ripple. With multiple transceivers, the V+
and V – pins may be paralleled into common capacitors.
5
5 Page 
LT1180A/LT1181A
U
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
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1181AISW.PDF ] | |
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