Transformer Driver for
Isolated RS-485 Interface
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = 5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
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
A
2.4
V
Shutdown Supply Current (Note 2)
0.4
A
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
A
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
FS = VCC
Low
High
SD = VCC
No load, VSD = 0V, FS low
High
Low
VFS = 0V
D1, D2; 100mA
FS = VCC or open
VFS = 0V
Supply Voltage (VCC) ...............................................-0.3V to +7V
Control Input Voltages (SD, FS) .................-0.3V to (VCC + 0.3V)
Output Switch Voltage (D1, D2) .............................................12V
Peak Output Switch Current (D1, D2) ......................................1A
Average Output Switch Current (D1, D2) .........................200mA
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW
SO (derate 5.88mW/°C above +70°C) ..........................471mW
MAX (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, 10s) .................................+300°C
Soldering Temperature (reflow)
PDIP, SO, MAX lead(Pb)-free .....................................+260°C
PDIP, SO, MAX, CERDIP containing lead(Pb) ............+240°C
MAX253
2
Maxim Integrated