+5V-Powered, Multichannel RS-232
Drivers/Receivers
TOP VIEW
ENTA 1
TA1IN 2
TA2IN 3
TA3IN 4
TA4IN 5
RB5OUT 6
RA4OUT 7
RA3OUT 8
RA2OUT 9
RA1OUT 10
ENRA 11
RA1IN 12
RA2IN 13
RA3IN 14
RA4IN 15
TA1OUT 16
TA2OUT 17
TA3OUT 18
TA4OUT 19
GND 20
MAX247
40 VCC
39 ENTB
38 TB1IN
37 TB2IN
36 TB3IN
35 TB4IN
34 RB4OUT
33 RB3OUT
32 RB2OUT
31 RB1OUT
30 ENRB
29 RB1IN
28 RB2IN
27 RB3IN
26 RB4IN
25 RB5IN
24 TB1OUT
23 TB2OUT
22 TB3OUT
21 TB4OUT
DIP
MAX247 FUNCTIONAL DESCRIPTION
9 RECEIVERS
4 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVERr B-SIDE (ENTB)
+5V
1µF
1 ENTA
16 TA1OUT
40
VCC
+5V +5V
2 TA1IN
400kΩ
17 TA2OUT
+5V +5V
3 TA2IN
400kΩ
18 TA3OUT
+5V +5V
4 TA3IN
400kΩ
19 TA4OUT
+5V +5V
5 TA4IN
400kΩ
6 RB5OUT
12 RA1IN
5kΩ
10 RA1OUT
13 RA2IN
5kΩ
9 RA2OUT
14 RA3IN
5kΩ
8 RA3OUT
15 RA4IN
5kΩ
7 RA4OUT
11 ENRA
GND
20
ENTB 39
TB1OUT 24
TB1IN 38
TB2OUT 23
TB2IN 37
TB3OUT 22
TB3IN 36
TB4OUT 21
TB4IN 35
RB5IN 25
5kΩ
RB1IN 29
5kΩ
RB1OUT 31
RB2IN 28
5kΩ
RB2OUT 32
RB3IN 27
5kΩ
RB3OUT 33
RB4IN 26
5kΩ
RB4OUT 34
ENRB 30
Figure 23. MAX247 Pin Configuration and Typical Operating Circuit
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