Transformer Driver for

Isolated RS-485 Interface

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Operating supply current is the current used by the MAX253 only, not including load current.

Note 2: Shutdown supply current includes output switch-leakage currents.

PARAMETER

MIN

TYP

MAX

UNITS

Shutdown Input Threshold

0.8

µA

2.4

V

Shutdown Supply Current (Note 2)

0.4

µA

Operating Supply Current (Note 1)

0.45

5.0

mA

Shutdown Input Leakage Current

10

pA

2.4

V

FS Input Threshold

0.8

50

µA

Switch On Resistance

1.5

4.0

Ω

250

350

500

kHz

Switch Frequency

150

200

300

FS Input Leakage Current

10

pA

Start-Up Voltage

2.5

2.2

V

CONDITIONS

Low

High

No load, SD = 0V, FS low

High

Low

FS = 0V

D1, D2; 100mA

FS = 0V

Output Switch Voltage (D1, D2) .............................................12V

Peak Output Switch Current (D1, D2) ......................................1A

Average Output Switch Current (D1, D2) .........................200mA

Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW

SO (derate 5.88mW/°C above +70°C) ..........................471mW

µMAX (derate 4.10mW/°C above +70°C) .....................330mW

CERDIP (derate 8.00mW/°C above +70°C) ..................640mW

Operating Temperature Ranges

MAX253C_ _ ........................................................0°C to +70°C

MAX253E_ _ .....................................................-40°C to +85°C

MAX253MJA ...................................................-55°C to +125°C

Junction Temperatures

MAX253C_ _/E_ _..........................................................+150°C

MAX253MJA .................................................................+175°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C