MAX253ESA Maxim Integrated Products, MAX253ESA Datasheet - Page 8

• Manufacturer Part Number: MAX253ESA
• Description: IC XFRMR DRIVER RS485 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Driverr

Specifications of MAX253ESA

• Number Of Drivers/receivers: 1/0
• Protocol: RS232, RS485
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Transformer Driver for
Isolated RS-485 Interface
Figure 4. Typical RS-485 Application Circuit, 3.3V Configuration
8
_______________________________________________________________________________________
V
3.3V
IN
ON / OFF
RO
DE
DI
C1
0.1µF
*
*
*
*
**
74HC04
74HC04
74HC04
74HC04 OR EQUIVALENT
SEE TABLE 2
5
4
6
V
N.C.
SD
CC
GND1
2
MAX253
3.3kΩ
390Ω
390Ω
GND2
7
D1
D2
FS
0.1µF
1N5817
3
1
8
C5
1
1
6
5
4
1CT:2.1CT**
1N5817
ISOLATION
PC410 / 417
3
2
PC410 / 417
BARRIER
PC357T
1N5817
1N5817
3
4
3
6
5
4
1
0.1µF
C3
390Ω
3.3kΩ
C2
22µF
8
3.3kΩ
IN
SET
4
3
1
6
MAX667
DI
DE
RO
GND
RE
4
MAX481
MAX483
MAX485
MAX487
2
SHDN
8
V
CC
OUT
5
GND
5
2
A
B
C4
22µF
6
7
485
I/O
ISO 5V