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PDF LT1341CNW Data sheet ( Hoja de datos )
| Número de pieza | LT1341CNW | |
| Descripción | 5V RS232 Transceiver with One Receiver Active in Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1341
5V RS232 Transceiver with One
Receiver Active in Shutdown
FEATURES
s One Receiver Remains Active While in Shutdown
s ESD Protection Over ±10kV
s Uses Small Capacitors: 0.1µF, 0.2µF
s 60µA Supply Current in Shutdown
s Pin Compatible with LT1137A
s 120kBaud Operation for RL = 3k, CL = 2500pF
s 250kBaud Operation for RL = 3k, CL = 1000pF
s CMOS Comparable Low Power: 60mW
s Operates from a Single 5V Supply
s Easy PC Layout: Flowthrough Architecture
s Rugged Bipolar Design
s Outputs Assume a High Impedance State When
Off or Powered Down
s Absolutely No Latchup
s Available in SSOP Package
APPLICATI S
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
The LT®1341 is an advanced low power three-driver, five-
receiver RS232 transceiver. Included on the chip is a
shutdown pin for reducing supply current to near zero.
During shutdown one receiver remains active to detect
incoming RS232 signals, for example, to wake up a
system. All other receivers and the drivers assume high
impedance states during shutdown.
The driver disable function provides additional control of
operating mode. When driver disable is high the charge
pump and drivers turn off. Receivers continue to operate
during driver disable.
New ESD structures on the chip allow the LT1341 to
survive multiple ±10kV strikes, eliminating the need for
costly TransZorbs® on the RS232 line pins.
The LT1341 is fully compliant with all EIA RS232 specifi-
cations and operates in excess of 120kbaud even driving
heavy capacitive loads.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI
TYPICAL APPLICATI
V+ 1
0.1µF
VCC
2
3
2 × 0.1µF
4
TO LINE
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
NC
5
6
7
8
9
10
11
12
13
14
LT1341
28 V –
27 0.1µF
26 2 × 0.1µF
25 DRIVER 1 IN
24 RX1 OUT
23 DRIVER 2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19
DRIVER 3 IN
18 RX5 OUT (LOW-Q)
17
GND
16
DRIVER DISABLE
15 NC
TO LOGIC
RING DETECT IN
µCONTROLLER
OR
µPROCESSOR
SHUTDOWN
CONTROL OUT
LT1341 • TA01
RECEIVER
OUTPUT
CL = 50pF
DRIVER
ROUTPUT
RL = 3k
CL = 2500pF
INPUT
Output Waveforms
LT1341 • TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LT1341
Driver Short-Circuit Current
30
25
ISC+
20
15
ISC–
10
5
0
–55 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1341 • TPC10
Receiver Output Waveforms
RX5 OUTPUT
CL = 50pF
RX1 TO RX4
OUTPUT
CL = 50pF
INPUT
LT1341 • TPC12
Receiver Short-Circuit Current
50
40
RX1 TO RX4 ISC–
30
RX1 TO RX4 ISC+
20 RX5 ISC–
10
RX5 ISC+
0
–55 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1341 • TPC11
Driver Output Waveforms
DRIVER OUTPUT
RL = 3k
DRIVER OUTPUT
RL = 3k
CL = 2500pF
INPUT
LT1341 • 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 lead to low output drive
levels and erratic charge pump operation.
GND: Ground Pin.
ON/OFF: A TTL/CMOS logic low puts the device in the low
power shutdown mode. All of the drivers and four receiv-
ers go to a high impedance state. Receiver RX5 remains
active while the transceiver is in shutdown. The trans-
ceiver consumes only 60µA of supply current while in
shutdown. A logic high fully enables the transceiver.
DRIVER DISABLE: This pin provides an alternate control
for the charge pump and RS232 drivers. A logic high on
this pin shuts down the charge pump and places all drivers
in a high impedance state. All receivers remain active
under these conditions. Floating the driver disable pin or
driving it to a logic low level fully enables the transceiver.
Supply current drops to 3mA when in driver disable mode.
A logic low on the ON/OFF pin supersedes the state of the
DRIVER DISABLE pin.
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
capacitors may be used to reduce supply ripple. With
multiple transceivers, the V+ and V – pins may be paral-
leled into common capacitors. For large numbers of
transceivers, increasing the size of the storage capaci-
tors is recommended to reduce ripple.
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LT1341CNW.PDF ] | |
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