MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V
TOP VIEW
1μF
40
V
CC
+
+5V
+5V
+5V
+5V
16 TA1OUT
TB1OUT 24
ENR
TA1IN
1
2
3
4
5
6
7
8
9
40
V
CC
400kΩ
400kΩ
39 ENT
2 TA1IN
TB1IN 38
TA2IN
38 TB1IN
37 TB2IN
36 TB3IN
35 TB4IN
34 RB5OUT
33 RB4OUT
32 RB3OUT
31 RB2OUT
17 TA2OUT
TB2OUT 23
TA3IN
TA4IN
3 TA2IN
TB2IN 37
RA5OUT
RA4OUT
RA3OUT
RA2OUT
+5V
+5V
+5V
+5V
MAX245
18 TA3OUT
TB3OUT 22
400kΩ
400kΩ
4 TA3IN
TB3IN 36
19 TA4OUT
TB4OUT 21
RA1OUT 10
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
5 TA4IN
TB4IN 35
ENT 39
1
ENR
11 RA1IN
RB1IN 29
5kΩ
5kΩ
10 RA1OUT
12 RA2IN
RB1OUT 30
RB2IN 28
5kΩ
5kΩ
9 RA2OUT
13 RA3IN
RB2OUT 31
RB3IN 27
DIP
5kΩ
5kΩ
8 RA3OUT
14 RA4IN
RB3OUT 32
RB4IN 26
MAX245 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (R ALWAYS ACTIVE)
A5
5 B-SIDE RECEIVERS (R ALWAYS ACTIVE)
B5
5kΩ
5kΩ
8 TRANSMITTTERS
7 RA4OUT
15 RA5IN
RB4OUT 33
RB5IN 25
4 A-SIDE TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
5kΩ
6 RA5OUT
5kΩ
RB5OUT 34
GND
20
ꢁigure 2±. MAX245 Pin Configuration and Typical Operating Circuit
30
Maxim Integrated
ROCHESTER [ Rochester Electronics ]
