LTC1349 Ver la hoja de datos (PDF) - Linear Technology
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LTC1349
Linear Technology
LTC1349 Datasheet PDF : 8 Pages
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LTC1349
TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Current
20
16
14
3 DRIVERS LOADED
12
RL = 3k
10
8
1 DRIVER LOADED
6
RL = 3k
4
2
0
0 10 20 30 40 50 60 70
TEMPERATURE (°C)
LTC1349 • TPC04
Driver Leakage in Shutdown
45
40
35
30
25
VOUT = –20V
20
15
10
VOUT = 20V
5
0
0 10 20 30 40 50 60 70
TEMPERATURE (°C)
LTC1349 • TPC05
Driver Short-Circuit Current
20
18
16
ISC–
14
ISC+
12
10
8
6
4
0
–40 –20
0 20 40 60 80 100
TEMPERATURE (°C)
LTC1349 • TPC06
Receiver Short-Circuit Current
60
50
40
ISC–
30
ISC+
20
Driver Output Waveforms
Receiver Output Waveforms
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
DRIVER
OUTPUT
RL = 3k
INPUT
RECEIVER
OUTPUT
CL = 2500pF
INPUT
LTC1349 • TPC08
LTC1349 • TPC09
10
–40 –20
0 20 40 60 80 100
TEMPERATURE (°C)
LTC1349 • TPC07
PI FU CTIO S
VCC: 5V Input Supply Pin. Supply current is typically 35µA
in the Shutdown mode. This pin should be decoupled with
a 0.1µF ceramic capacitor.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in Shutdown mode, with receivers 4
and 5 kept alive and the supply current equal to 35µA. All
driver outputs and other receiver outputs are in high
impedance state. This pin can not float.
V+: Positive Supply Output (RS232 Drivers). V+ ≅ 2VCC –
1V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or 5V.
4
With multiple devices, the V + and V – pins may be paral-
leled into common capacitors. For large numbers of de-
vices, increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
V–: Negative Supply Output (RS232 Drivers). V – ≅ 2VCC –
1.5V. This pin requires an external capacitor C = 0.1µF for
charge storage.
C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1µF: one from
C1+ to C1–, and another from C2+ to C2–. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 20Ω.
1349fa
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