LTC1337CN View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1337CN 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.
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.
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.
4
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