ltc1383 Linear Technology Corporation, ltc1383 Datasheet - Page 4

• Manufacturer Part Number: ltc1383
• Description: 5v Low Power Rs232 Transceiver
• Manufacturer: Linear Technology Corporation

LTC1383
PI FU CTIO S
V
with a 0.1µF ceramic capacitor.
GND: Ground Pin.
V
2V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or
V
a common capacitor. For large numbers of devices, in-
creasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
V
– 2V). This pin requires an external capacitor C = 0.1µF for
charge storage.
C1
pins require two external capacitors C = 0.1µF: one from
C1
4
TYPICAL PERFOR A CE CHARACTERISTICS
CC
CC
+
–
18
16
14
12
10
: Positive Supply Output (RS232 Drivers). V
: Negative Supply Output (RS232 Drivers). V
+
+
U
8
6
4
2
0
: 5V Input Supply Pin. This pin should be decoupled
. With multiple devices, the V
, C1
to C1
0
V
vs Temperature
CC
–
, C2
10
Supply Current
U
–
and another from C2
+
20
TEMPERATURE (°C)
, C2
2 DRIVERS LOADED
1 DRIVER LOADED
30
–
: Commutating Capacitor Inputs. These
R
R
U
L
L
= 3k
= 3k
40
50
LTC1383 • TPC04
W
60
+
U
+
70
and V
to C2
C
L
= 2500pF
OUTPUT
OUTPUT
DRIVER
DRIVER
–
R
R
INPUT
L
L
pins may share
–
= 3k
= 3k
. To maintain
Driver Output Waveforms
–
+
≅ – (2V
≅ 2V
CC
CC
–
5µs/DIV
charge pump efficiency, the capacitor’s effective series
resistance should be less than 2Ω.
TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS
compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to V
included on chip.
TR OUT: Driver Outputs at RS232 Voltage Levels. The
driver outputs are protected against ESD to ±10kV for
human body model discharges.
RX IN: Receiver Inputs. These pins can be forced to ±25V
without damage. The receiver inputs are protected against
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
RX OUT: Receiver Outputs with TTL/CMOS Voltage
Levels.
LTC1383 • TPC05
RECEIVER
C
OUTPUT
L
= 51pF
INPUT
Receiver Output Waveforms
5µs/DIV
LTC1383 • TPC06
CC
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