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LTC1349

5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in SHUTDOWN

Linear Technology 

LTC1349

PI FU CTIO S

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.

UW

W

SWITCHI G TI E WAVEFOR S

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.

DRIVER

INPUT

1.4V

DRIVER

OUTPUT

0V

tLHD

1.4V

tHLD

VCC

0V

V+

0V

V–

LTC1349 • F01

Figure 1. Driver Propagation Delay Timing

RX

1.7V

INPUT

RX

OUTPUT

0.8V

tLHR

VCC

1.3V

0V

tHLR

2.4V VCC

0V

LTC1349 • F02

Figure 2. Receiver Propagation Delay Timing

TEST CIRCUITS

Driver Timing Test Load

DRIVER

INPUT

DRIVER

DRIVER

OUTPUT

51pF 3k

LTC1349 • TA03

Receiver Timing Test Load

RX INPUT

RX

RX

OUTPUT

51pF

LTC1349 • TA04

1349fa

5

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