5

LTC1349

PI FU CTIO S

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 SHUT-

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. Receiver 1, 2 and 3 outputs are in a high impedance

state when in SHUTDOWN mode to allow data line sharing.

Receivers 4 and 5 are kept alive in SHUTDOWN.

TI E WAVEFOR

S

G

WITCHI

S

Figure 1. Driver Propagation Delay Timing

Figure 2. Receiver Propagation Delay Timing

1.4V

0V

0V

0V

DRIVER

INPUT

DRIVER

OUTPUT

1.4V

LTC1349 • F01

0.8V

0V

2.4V

RX

INPUT

RX

OUTPUT

1.3V

1.7V

LTC1349 • F02

0V

TEST CIRCUITS

Driver Timing Test Load

Receiver Timing Test Load

DRIVER

DRIVER

INPUT

3k

51pF

DRIVER

OUTPUT

LTC1349 • TA03

RX

RX INPUT

51pF

RX

OUTPUT

LTC1349 • TA04