MAX3221E
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER
WITH 15-kV IEC ESD PROTECTION
www.ti.com
SLLS686A–OCTOBER 2005–REVISED MAY 2006
APPLICATION INFORMATION
1
2
16
15
FORCEOFF
EN
V
CC
C1+
V+
+
C
= 0.1 µF
BYPASS
3
−
14
Auto-
powerdown
+
−
+
−
(1)
GND
C1
C3
4
5
C1−
C2+
13
DOUT
+
−
12
11
10
FORCEON
DIN
C2
C4
6
7
C2−
V−
−
+
INVALID
8
9
RIN
ROUT
5 kΩ
(1) C3 can be connected to V or GND.
CC
NOTES: A. Resistor values shown are nominal.
B. Nonpolarizedceramic capacitors are acceptable. If polarized tantalum or electrolytic capacitors are used, they should be connected
as shown.
V
CC
vs CAPACITOR VALUES
V
CC
C1
C2, C3, and C4
3.3 V ± 0.3 V
5 V ± 0.5 V
3 V to 5.5 V
0.1 µF
0.047 µF
0.1 µF
0.1 µF
0.33 µF
0.47 µF
Figure 6. Typical Operating Circuit and Capacitor Values
10
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