LTC1348CSW datasheet(5/8 Pages) LINER

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LTC1348

PI FU CTIO S

VCC: 3V to 5.5V Input Supply Pin. This pin should be

decoupled with a 0.1

µF ceramic capacitor.

GND: Ground Pin.

RXEN: TTL/CMOS Compatible Enable Pin. Refer to Table

1 for its functional description.

DREN: TTL/CMOS Compatible Enable Pin. Refer to Table

1 for its functional description.

V+: Positive Supply Output (RS232 Drivers). This pin

requires an external capacitor C = 0.1

µF for charge stor-

age. The capacitor may be tied to ground or VCC. With

multiple devices, the V+ and V – pins may be paralleled into

common capacitors. For large numbers of devices, in-

creasing the size of the shared common storage capaci-

tors is recommended to reduce ripple.

V–: Negative Supply Output (RS232 Drivers). This pin

requires an external capacitor C = 0.1

µF for charge

storage.

C1+, C1–, C2+, C2–, C3+, C3–: Commutating Capacitor

Inputs. These pins require three external capacitors C =

0.1

µF: one from C1+ to C1–, another from C2+ to C2– and

another from C3+ to C3–. To maintain charge pump

efficiency, the capacitor’s effective series resistance should

be less than 1

Ω. Ceramic capacitors are recommended.

DR 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 VCC are

included on chip. To minimize power consumption, the

internal driver pull-up resistors are disconnected from VCC

in the Shutdown or Receiver Alive mode.

DR OUT: Driver Outputs at RS232 Voltage Levels. Outputs

are in a high impedance state when in the Shutdown,

Receiver Alive mode or VCC = 0V. 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. In

Receiver Alive mode all receivers have no hysteresis.

RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-

els. Outputs are in a high impedance state when in the

Shutdown or Receiver Disable mode to allow data line

sharing.

Table 1. Functional Description

MODE

RX ENABLE

DR ENABLE

DRIVERS

RECEIVERS

ICC TYP

Shutdown

All Drivers Shutdown.

All Receivers Shutdown.

0.2

µA

All Driver Outputs Assume High Impedance.

All Receiver Outputs Assume High Impedance.

All Driver Pull-Up Resistors Disconnect

From VCC.

Receiver

All Drivers Alive.

All Receiver Outputs in Three-State.

600

µA at

Disable

3.3V,

800

µA at

Receiver

All Drivers Shutdown.

All Receivers Alive.

µA

Alive

All Driver Outputs in Three-State.

All Driver Pull-Up Resistors Disconnect

From VCC.

Normal

All Drivers Alive.

All Receivers Alive.

600

µA at

3.3V,

800

µA at

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