LTC1337C Просмотр технического описания (PDF) - Linear Technology
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LTC1337C Datasheet PDF : 8 Pages
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LTC1337
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
TEMPERATURE (°C)
60 70
1337 G04
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)
1337 G05
Receiver Short-Circuit Current
55
50
45
40
ISC–
35
30
25
ISC+
Driver Output Waveforms
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
DRIVER
OUTPUT
RL = 3k
INPUT
20
15
10
0 10 20 30 40 50 60 70
TEMPERATURE (°C)
1337 G07
Driver Short-Circuit Current
20
18
16
14
12
ISC–
10
8
ISC+
6
4
2
0 10 20 30 40 50 60 70
TEMPERATURE (°C)
1337 G06
Receiver Output Waveforms
RX
OUTPUT
CL = 50pF
INPUT
PI FU CTIO S
VCC: 5V Input Supply Pin. Supply current less than 1µA 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 the Shutdown mode which reduces
input supply current to less than 1µA and places all drivers
and receivers in high impedance state. This pin cannot
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
devices, 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 50Ω.
1337fa
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