MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V
TOP VIEW
1μF
40
+
V
CC
ENA
TA1IN
1
2
3
4
5
6
7
8
9
40
V
CC
+5V
400kΩ
+5V +5V
400kΩ
+5V +5V
400kΩ
+5V +5V
+5V
TA1OUT
TA1IN
TB1OUT 24
TB1IN 38
16
2
39 ENB
TA2IN
38 TB1IN
37 TB2IN
36 TB3IN
35 TB4IN
34 RB5OUT
33 RB4OUT
32 RB3OUT
31 RB2OUT
TA3IN
17 TA2OUT
TB2OUT 23
TB2IN 37
TA4IN
RA5OUT
RA4OUT
RA3OUT
RA2OUT
3
TA2IN
MAX246
18 TA3OUT
TB3OUT 22
TB3IN 36
TA3IN
4
RA1OUT 10
TA4OUT
TB4OUT 21
19
RA1IN 11
RA2IN 12
RA3IN 13
RA4IN 14
RA5IN 15
TA1OUT 16
TA2OUT 17
TA3OUT 18
TA4OUT 19
GND 20
30 RB1OUT
29 RB1IN
28 RB2IN
27 RB3IN
26 RB4IN
25 RB5IN
24 TB1OUT
23 TB2OUT
22 TB3OUT
21 TB4OUT
400kΩ
TA4IN
ENA
TB4IN
ENB
5
1
35
39
11 RA1IN
RB1IN 29
5kΩ
5kΩ
10 RA1OUT
12 RA2IN
RB1OUT 30
RB2IN 28
5kΩ
5kΩ
9
RA2OUT
RB2OUT 31
RB3IN 27
DIP
13 RA3IN
5kΩ
5kΩ
MAX246 FUNCTIONAL DESCRIPTION
10 RECEIVERS
8
RA3OUT
RB3OUT 32
RB4IN 26
5 A-SIDE RECEIVERS (R ALWAYS ACTIVE)
A5
5 B-SIDE RECEIVERS (R ALWAYS ACTIVE)
B5
14 RA4IN
8 TRANSMITTERS
5kΩ
5kΩ
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
2 CONTROL PINS
7
RA4OUT
RB4OUT 33
RB5IN 25
15 RA5IN
ENABLE A-SIDE (ENA)
ENABLE B-SIDE (ENB)
5kΩ
RA5OUT
5kΩ
RB5OUT 34
6
GND
20
ꢁigure 22. MAX246 Pin Configuration and Typical Operating Circuit
Maxim Integrated
31
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
