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PDF LT1342CSW Data sheet ( Hoja de datos )
| Número de pieza | LT1342CSW | |
| Descripción | 5V RS232 Transceiver with 3V Logic Interface | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1342
5V RS232 Transceiver with
3V Logic Interface
FEATURES
s ESD Protection Over ±10kV
s 3V Logic Interface
s Uses Small Capacitors: 0.1µF, 0.2µF
s 1µA Supply Current in Shutdown
s Low Power Driver Disable Operating Mode
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 5V Supply and 3V Logic 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
APPLICATI S
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
The LT®1342 is an advanced low power three-driver, five-
receiver RS232 transceiver. The LT1342 operates from a
5V supply and a 3V logic supply. Receiver outputs can
interface directly to 3V logic circuits. Included on the chip
is a shutdown pin for reducing supply current to near zero.
All receivers and 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 LT1342 to
survive multiple ±10kV strikes, eliminating the need for
costly TransZorbs® on the RS232 line pins.
The LT1342 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
5V 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
ON/OFF
3V VL
5
6
7
8
9
10
11
12
13
14
LT1342
28 V –
27 0.1µF
26 2 × 0.1µF
25 DRIVER 1 IN
24 RX1 OUT
23
DRIVER 2 IN
22 RX2 OUT
21
TO 3V LOGIC
RX3 OUT
20 RX4 OUT
19 DRIVER 3 IN
18
RX5 OUT
17
GND
16
DRIVER DISABLE
15 NC
LT1342 • TA01
RECEIVER
OUTPUT
VL = 3V
CL = 50pF
DRIVER
ROUTPUT
RL = 3k
CL = 2500pF
INPUT
Output Waveforms
LT1342 • TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LT1342
Driver Short-Circuit Current
30
25
ISC+
20
15
ISC–
10
5
0
–55 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1342 • TPC10
Receiver Output Waveforms
RX5 OUTPUT
CL = 50pF
RX1 TO RX4
OUTPUT
CL = 50pF
INPUT
VL = 3V
LT1342 • 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)
LT1342 • TPC11
Driver Output Waveforms
DRIVER OUTPUT
RL = 3k
DRIVER OUTPUT
RL = 3k
CL = 2500pF
INPUT
LT1342 • 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.
VL: 3V Logic Supply Pin. Provides power to the receiver
outputs. Decouple with a 0.1µF ceramic capacitor.
GND: Ground Pin.
ON/OFF: A TTL/CMOS Compatible Operating Mode Con-
trol. A logic low puts the device in the low power shutdown
mode. Drivers and receivers assume a high impedance
state in shutdown. The transceiver consumes almost no
supply current while in shutdown. A logic high fully
enables the transceiver. An ON/OFF logic low signal super-
sedes the state of the DRIVER DISABLE pin.
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 five receivers remain active
under these conditions. Floating the DRIVER DISABLE pin
or driving it to a logic low level fully enables the trans-
ceiver. A logic low on the ON/OFF pin supersedes the state
of the DRIVER DISABLE pin. Supply current drops to 3mA
when in driver disable mode.
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. With multiple
transceivers, the V + and V – pins may be paralleled into
common charge storage capacitors. Larger value capaci-
tors may be used to reduce supply ripple.
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LT1342CSW.PDF ] | |
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