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