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LTC1338I

5V Low Power RS232 5-Driver/3-Receiver Transceiver

Linear Technology 

LTC1338

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 SHUT-

DOWN, 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.

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

els. Outputs are in a high impedance state when in SHUT-

DOWN or RECEIVER DISABLE mode to allow data line

sharing.

Table 1. Functional Description

MODE

SHUTDOWN

RX ENABLE

0

DR ENABLE

0

Receiver Disable

0

1

RECEIVER ALIVE

1

0

Normal

1

1

DRIVERS

All driver outputs are

high impedance.

All drivers alive.

All driver outputs are

high impedance.

All drivers alive.

RECEIVERS

All receiver outputs are

high impedance.

All receiver outputs are

high impedance.

All receivers alive.

All receivers alive.

ICC (µA)(TYP)

0.2

500

50

500

SWITCHI G TI E WAVEFOR S

DRIVER

INPUT

1.4V

DRIVER

OUTPUT

0V

t LHD

1.4V

t HLD

VCC

RX

0V INPUT

V+

0V

V–

LTC1338 • F01

RX

OUTPUT

t LHR

1.7V

0.8V

VCC

1.3V

0V

t HLR

2.4V VCC

0V

LTC1338 • F02

Figure 1. Driver Propagation Delay Timing

Figure 2. Receiver Propagation Delay Timing

5

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