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MAX253EPA

Transformer Driver for Isolated RS-485 Interface

Maxim Integrated 

MAX253

Pin Configuration

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+

D1 1

GND1 2

FS 3

MAX253

SD 4

8 D2

7 GND2

6 VCC

5 N.C.

DIP/SO/μMAX

Transformer Driver for

Isolated RS-485 Interface

Pin Description

PIN NAME

FUNCTION

1

D1

Open drain of N-channel transformer drive 1.

2

GND1

Ground. Connect both GND1 and GND2

to ground.

Frequency switch. If FS = VCC or open,

3

FS

switch frequency = 350kHz; if VFS = 0V,

switch frequency = 200kHz.

4

SD

Shutdown. Ground for normal operation,

connect high for shutdown.

5

N.C. Not internally connected.

6

VCC 5V supply voltage.

7

GND2

Ground. Connect both GND1 and GND2

to ground.

8

D2

Open drain of N-channel transformer drive 2.

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