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LTC1347CN

5V Low Power RS232 3-Driver/5-Receiver Transceiver with 5 Receivers Active in Shutdown

Linear Technology 

LTC1347

PI FU CTIO S

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 2Ω.

DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/

CMOS compatible. Inputs should not be allowed to float.

Tie unused inputs to VCC.

DRIVER OUT: Driver Outputs at RS232 Voltage Levels.

Outputs are in a high impedance state when in shutdown

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.

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

els. All receivers are kept alive in shutdown.

UW

W

SWITCHI G TI E WAVEFOR S

DRIVER

INPUT

1.4V

DRIVER

OUTPUT

0V

t LHD

1.4V

t HLD

VCC

0V

V+

0V

V–

1347 F01

Figure 1. Driver Propagation Delay Timing

RX

1.7V

INPUT

RX

OUTPUT

0.8V

t LHR

VCC

1.3V

0V

t HLR

2.4V VCC

0V

1347 F02

Figure 2. Receiver Propagation Delay Timing

5

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