|Category||Interface and Interconnect => RS-485|
|Description||Transformer Driver For Isolated RS-485 Interface
The MAX253 is a monolithic oscillator/power-driver, specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. It drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W.
The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-make action between the two switches.
|Company||Maxim Integrated Products|
|Datasheet||Download MAX253 datasheet
|Cross ref.||Similar parts: SN6501|
The is a monolithic oscillator/power-driver, specifically designed to provide isolated power for an isolated or RS-232 data interface. It drives a center-tapped transformer primary from 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels to 1W. The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-beforemake action between the two switches. The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator.
Power-Supply Transformer Driver for Isolated RS-485/RS-232 Data-Interface Applications Single or +3.3V Supply Low-Current Shutdown Mode: 0.4µA Pin-Selectable Frequency: 200kHz 8-Pin DIP, SO, and µMAX® Packages
PART MAX253ESA MAX253MJA TEMP RANGE to +125°C PIN-PACKAGE 8 Plastic DIP SO 8 MAX Dice* 8 Plastic DIP SO 8 CERDIP**
Isolated RS-485/RS-232 Power-Supply Transformer Driver High Noise-Immunity Communications Interface Isolated and/or High-Voltage Power Supplies Bridge Ground Differentials Medical Equipment Process Control
*Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883.µMAX is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Supply Voltage 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 µMAX (derate 4.10mW/°C above +70°C).....................330mW CERDIP (derate 8.00mW/°C above +70°C)..................640mW Operating Temperature Ranges to +125°C Junction Temperatures MAX253C_ _/E_ _..........................................................+150°C MAX253MJA.................................................................+175°C Storage Temperature to +160°C Lead Temperature (soldering, 10sec).............................+300°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.
(VCC TA = TMIN to TMAX, unless otherwise noted. Typical values are = +25°C.) PARAMETER Switch On Resistance Switch Frequency Operating Supply Current (Note 1) Shutdown Supply Current (Note 2) Shutdown Input Threshold Shutdown Input Leakage Current FS Input Threshold FS Input Leakage Current Start-Up Voltage High Low FS = VCC FS = VCC or open 0V No load, 0V, FS low SD = VCC High Low CONDITIONS MIN TYP MAX UNITS kHz pA V
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.INCLUDES SWITCH LEAKAGE CURRENTS SHUTDOWN CURRENT (A) 0.8
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