Datasheet

MAX845
Isolated Transformer Driver
for PCMCIA Applications
______________________________________________________________________________________ 11
C3
0.1µF
C2
2.2µF
ISO 5V
ISOLATION
BARRIER
5V
V
IN
1
8
5
C1
0.1µF
MBR0520
MAX845
D1
D2
GND1 GND2
V
CC
6
2 7
N.C.
SD
4
ON / OFF
10 x PC417
*74HC04 OR EQUIVALENT
MAX225
ENSD
C4
2.2µF
8 2
MBR0520
MAX883
56 4
SHDNSET GND
IN OUT
390Ω
3 11
13, 14
27, 28
T1
IN
T1
OUT
390Ω
*74HC04
T1
IN
1
2
4
5
6
1
24
5
6
390Ω
74HC04
T2
IN
390Ω
74HC04
T3
IN
390Ω
74HC04
T4
IN
390Ω
74HC04
T5
IN
74HC04
R1
OUT
74HC04
74HC04
74HC04
74HC04
R2
OUT
R3
OUT
R4
OUT
R5
OUT
5 x 3.3k
390Ω
390Ω
390Ω
390Ω
4 12
T2
IN
T2
OUT
25 18
T3
IN
T3
OUT
24 17
T4
IN
T4
OUT
23 16
T5
IN
T5
OUT
5 10
R1
OUT
R1
IN
6 9
R2
OUT
R2
IN
7 8
R3
OUT
R3
IN
22
19
R4
OUT
R4
IN
21
20
R5
OUT
R5
IN
V
CC
21
GND
5 x 3.3k
1N5711
6
5
4
1
2
390Ω
3.3k
V
CC
ISO
R
OUT
R
OUT
1CT:1.3CT
1N5711
1
2
6
5
4
390Ω
3.3k
V
CC
ISO
T
IN
T
IN
*74HC04
4N25 LOWER SPEED, LOWER COST ALTERNATE OPTOCOUPLER CONFIGURATIONS (FOR DATA RATES BELOW 9.6kbps)
FS
3
74HCO4
4N25
ISO
GND
4N25
ISO
GND
N.C.
Figure 10. Typical RS-232 Application Circuit