+3V to +5.5V RS-232 Transceivers
with AutoShutdown
MAX3221/MAX3223/MAX3243
+3.3V
26
0.1μF
V
CC
27
3
28
C1+
V+
C1
0.1μF
C3
0.1μF
24
1
C1-
C2+
COMPUTER SERIAL PORT
MAX3243
V-
C4
C2
0.1μF
0.1μF
2
C2-
+V
+V
-V
T1IN
T1OUT
9
14
T2IN
T3IN
LOGIC
INPUTS
T2OUT 10
13
12
11
T3OUT
GND
Tx
R2OUTB
20
R1OUT
R2OUT
R3OUT
R1IN
4
5
19
18
17
5kΩ
R2IN
R3IN
R4IN
R5IN
LOGIC
OUTPUTS
5kΩ
5kΩ
6
7
8
RS-232
INPUTS
R4OUT
R5OUT
16
5kΩ
5kΩ
SERIAL
MOUSE
15
23
FORCEON
FORCEOFF
INVALID
22
21
V
CC
TO POWER
MANAGEMENT
UNIT
GND
25
Figure 7b. Mouse Driver Test Circuit
www.maximintegrated.com
Maxim Integrated | 10
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
