SP3221E_17 Datasheet, PDF (8/22 Pages) Exar Corporation – Intelligent +3.0V to +5.5V RS-232 Transceiver

PIN DESCRIPTION
Name
EN
C1+
V+
C1-
C2+
C2-
V-
R₁IN
R₁OUT
STATUS
T₁IN
ONLINE
T₁OUT
GND
Vcc
SHUTDOWN
Function
Receiver Enable, apply logic LOW for normal operation. Apply logic HIGH to
disable receiver output (high-Z state).
Positive terminal of the voltage doubler charge-pump capacitor
Regulated +5.5V output generated by charge pump
Negative terminal of the voltage doubler charge-pump capacitor
Positive terminal of the inverting charge-pump capacitor
Negative terminal of the inverting charge-pump capacitor
Regulated -5.5V output generated by charge pump
RS-232 receiver input
TTL/CMOS receiver output
TTL/CMOS output indicating receiver signal activity
TTL/CMOS driver input
Apply logic HIGH to override AUTO ON-LINE ® circuitry keeping driver active
(SHUTDOWN must also be logic HIGH, refer to table 2)
RS-232 driver output
Ground
+3.0V to +5.5V supply voltage
Apply logic LOW to shut down drivers and charge pump. This overrides all
AUTO ON-LINE ® circuitry and ONLINE (refer to table 2).
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • www.exar.com
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SP3221E_200_081816