Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com

SP3223E/EB/EU_0_06272

8

PIN DESCRIPTION

Name

Function

Pin #

EN

Receiver Enable, Apply logic LOW for normal operation. Apply logic HIGH to

disable receiver outputs (high-Z state).



C+

Positive terminal of the voltage doubler charge-pump capacitor

2

V+

Regulated +5.5V output generated by charge pump

3

C-

Negative terminal of the voltage doubler charge-pump capacitor

4

C2+

Positive terminal of the inverting charge-pump capacitor

5

C2-

Negative terminal of the inverting charge-pump capacitor

6

V-

Regulated -5.5V output generated by charge pump

7

T

RS-232 Driver output

8

R

RS-232 receiver input

9

R

TTL/CMOS receiver output

0

STATUS

TTL/CMOS output indicating online and shutdown status



T

TTL/CMOS driver input

2

T

TTL/CMOS driver input

3

ONLINE

Apply logic HIGH to override AUTO ON-LINE ® circuitry keeping drivers active

(SHUTDOWN must also be logic HIGH, refer to table 2).

4

R

TTL/CMOS receiver output

5

R

RS-232 receiver input

6

T

RS-232 Driver output

7

GND

Ground

8

Vcc

+3.0V to +5.5V supply voltage

9

SHUTDOWN

Apply logic LOW to shut down drivers and charge pump. This overrides all

AUTO ON-LINE ® circuitry and ONLINE (refer to table 2).

20

Table 2. Pin Description