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LT1342 Datasheet(PDF) 5 Page - Linear Technology

Part # LT1342
Description  5V RS232 Transceiver with 3V Logic Interface
Download  8 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1342 Datasheet(HTML) 5 Page - Linear Technology

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5
LT1342
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
Receiver Output Waveforms
Receiver Short-Circuit Current
Driver Output Waveforms
DRIVER OUTPUT
RL = 3k
CL = 2500pF
INPUT
DRIVER OUTPUT
RL = 3k
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1
µF 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 0.1
µF 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.
LT1342 • TPC13
Driver Short-Circuit Current
RX5 OUTPUT
CL = 50pF
RX1 TO RX4
OUTPUT
CL = 50pF
INPUT
LT1342 • TPC12
VL = 3V
TEMPERATURE (
°C)
–55
20
25
30
25
75
LT1342 • TPC10
15
10
–25
0
50
100
125
5
0
ISC
+
ISC
TEMPERATURE (
°C)
–55
0
20
50
0
50
75
LT1342 • TPC11
10
40
30
–25
25
100
125
RX1 TO RX4
ISC
+
RX1 TO RX4
ISC
RX5 ISC
RX5 ISC
+


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