Details, datasheet, quote on part number: MAX253M
PartMAX253M
CategoryInterface and Interconnect
Description-
CompanyMaxim Integrated Products
DatasheetDownload MAX253M datasheet
  

 

Features, Applications

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.

o Power-Supply Transformer Driver for Isolated RS-485/RS-232 Data-Interface Applications o Single or +3.3V Supply o Low-Current Shutdown Mode: 0.4A o Pin-Selectable Frequency: o 8-Pin DIP, SO, and MAX Packages

PART MAX253EUA MAX253MJA TEMP. RANGE to +125C PIN-PACKAGE 8 Plastic DIP SO 8 MAX Dice* 8 Plastic DIP SO 8 MAX 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.

Call toll free 1-800-998-8800 for free samples or literature.

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 = +70C) Plastic DIP (derate 9.09mW/C above +70C).............727mW SO (derate 5.88mW/C above +70C)..........................471mW MAX (derate 4.10mW/C above +70C).....................330mW CERDIP (derate 8.00mW/C above +70C)..................640mW Operating Temperature Ranges to +125C Junction Temperatures MAX253C_ _/E_ _..........................................................+150C MAX253MJA.................................................................+175C Storage Temperature to +160C Lead Temperature (soldering, 10sec).............................+300C

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 = +25C.) 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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