5

LTC1347

PI FU CTIO S

pins require two external capacitors C = 0.1

µF: one from

charge pump efficiency, the capacitor’s effective series

resistance should be less than 2

Ω.

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

CMOS compatible. Inputs should not be allowed to float.

DRIVER OUT: Driver Outputs at RS232 Voltage Levels.

Outputs are in a high impedance state when in shutdown

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.

0.8V

0V

2.4V

RX

INPUT

RX

OUTPUT

1.3V

1.7V

1347 F02

0V

SWITCHI G TI E WAVEFOR S

Figure 1. Driver Propagation Delay Timing

1.4V

0V

0V

0V

DRIVER

INPUT

DRIVER

OUTPUT

1.4V

1347 F01

Figure 2. Receiver Propagation Delay Timing