ST3243E

3/18

PIN DESCRIPTION

PlN N°

SYMBOL

NAME AND FUNCTION

A1

Second Receiver Input Voltage

A2

Third Receiver Input Voltage

A3

Fourth Receiver Input Voltage

A4

Fifth Receiver Input Voltage

A5

First Transmitter Output Voltage

A6

Second Transmitter Output Voltage

B1

V-

-5.5V Generated by the Charge Pump

B2

First Receiver Input Voltage

B3

Third Transmitter Output Voltage

B4

Third Transmitter Input Voltage

B5

First Transmitter Input Voltage

B6

Second Transmitter Input Voltage

C1

Positive Terminal of Inverting Charge Pump Capacitor

C2

Negative Terminal of Inverting Charge Pump Capacitor

C5

Fourth Receiver Output Voltage

C6

Fifth Receiver Output Voltage

D1

Positive Terminal of Voltage- Charge Pump Capacitor

D2

V+

5.5V Generated by the Charge Pump

D3

Supply Voltage

D4

FORCEON

Drive high to override automatic circuitry keeping transmitters

on (FORCEOFF must be high)

D5

First Receiver Output Voltage

D6

Third Receiver Output Voltage

E1

GND

Ground

E2

Negative Terminal of Voltage- Charge Pump Capacitor

E3

FORCEOFF

Drive low to shut down transmitters and on-board power

supply. This over-rides all automatic circuitry and FORCEON

E4

INVALID

Output of the valid signal detector. Indicates if a valid RS-232

level is present on receiver inputs logic "1"

E5

Non-inverting Complementary Receiver Output, always active

for wake-up

E6

Second Receiver Output Voltage