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MAX253

Features: Power-Supply Transformer Driver for Isolatedn RS-485/RS-232 Data-Interface ApplicationsSingle +5V or +3.3V SupplyLow-Current Shutdown Mode: 0.4µAPin-Selectable Frequency: 350kHz or 200kHz8-Pin DIP, SO, and µMAX PackagesApplicationIsolated RS-485/RS-232 Power-SupplyTransformer...

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SeekIC No. : 004409679 Detail

MAX253: Features: Power-Supply Transformer Driver for Isolatedn RS-485/RS-232 Data-Interface ApplicationsSingle +5V or +3.3V SupplyLow-Current Shutdown Mode: 0.4µAPin-Selectable Frequency: 350kHz or 2...

MAX253 Data Sheet

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Part Number:
MAX253
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/27

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Product Details

Description



Features:

 Power-Supply Transformer Driver for Isolatedn RS-485/RS-232 Data-Interface Applications
 Single +5V or +3.3V Supply
Low-Current Shutdown Mode: 0.4µA
 Pin-Selectable Frequency: 350kHz or 200kHz
 8-Pin DIP, SO, and µMAX Packages


Application

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


Pinout

Connection Diagram


Specifications

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
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


Description

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-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.




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