SN75LPE185

LOW-POWER MULTIPLE RS-232 DRIVERS/RECEIVERS

WITH ENABLE

SLLS256F – DECEMBER 1996 – REVISED NOVEMBER 2001

11

POST OFFICE BOX 655303

APPLICATION INFORMATION

receiver output states

RECEIVER KNOWN OUTPUT STATES

DURING POWER-DOWN, STANDBY, OR WAKE-UP MODES

RECEIVER NUMBER

SIGNAL NAME

RECEIVER OUTPUT

RY1

DCD

High

RY2

DSR

High

RY3

RX

Low

RY4

CTS

High

RY5

RI

High

fault protection during power down

device outputs are shorted to

±15 V and the power supplies are at low voltage and provide low-impedance paths

to ground.

SN75LPE185

Output

SN75LPE185

Output

VDD

VSS

Figure 8. Power-Supply Protection to Meet Power-Off Fault Conditions of TIA/EIA-232-F