LTC1337CSW datasheet(4/8 Pages) LINER

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LTC1337

1337fa

TYPICAL PERFOR A CE CHARACTERISTICS

VCC Supply Current

TEMPERATURE (°C)

1337 G05

VOUT = –20V

VOUT = 20V

TEMPERATURE (°C)

1337 G04

3 DRIVERS LOADED

RL = 3k

1 DRIVER LOADED

RL = 3k

Driver Short-Circuit Current

Driver Leakage in Shutdown

Receiver Short-Circuit Current

Driver Output Waveforms

INPUT

DRIVER

OUTPUT

RL = 3k

DRIVER

OUTPUT

RL = 3k

CL = 2500pF

Receiver Output Waveforms

OUTPUT

CL = 50pF

INPUT

TEMPERATURE (°C)

1337 G06

ISC

–

TEMPERATURE (°C)

1337 G07

ISC

–

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.

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.

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