MAX3243
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS350B – APRIL 1999 – REVISED JANUARY 2000
APPLICATION INFORMATION
28
C1+
27
1
V+
C2+
+
+
–
†
C3
C2
+
–
2
–
C1
26
C2–
V–
V
CC
+
–
C
BYPASS
= 0.1 µF
3
25
24
23
GND
C1–
–
+
C4
4
5
6
7
8
RIN1
FORCEON
FORCEOFF
RIN2
RIN3
22
RS-232 Inputs
RIN4
RIN5
21
20
INVALID
ROUT2B
9
DOUT1
DOUT2
19
18
17
10
ROUT1
ROUT2
RS-232 Outputs
5 kΩ
11
DOUT3
5 kΩ
Logic Outputs
12
13
14
DIN3
DIN2
DIN1
ROUT3
5 kΩ
16
15
Logic Inputs
ROUT4
ROUT5
5 kΩ
5 kΩ
†
C3 can be connected to V
or GND.
CC
NOTE A: Resistor values shown are nominal.
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
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265