Datasheet > MAX253_10

MAX253_10

更新时间： 2024-11-18 11:55:55

品牌	Logo	应用领域
美信 - MAXIM		变压器驱动器
页数	文件大小	规格书
18页	536K
描述
Transformer Driver for Isolated RS-485 Interface

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MAX253_10 数据手册

19-0226; Rev 2; 4/10

Transformer Driver for

Isolated RS-485 Interface

MAX253

_______________General Description

____________________________Features

The MAX253 monolithic oscillator/power-driver is

specifically designed to provide isolated power for an

isolated RS-485 or RS-232 data interface. The device

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.

♦ Power-Supply Transformer Driver for Isolated

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

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.

♦ 8-Pin DIP, SO, and µMAX Packages

______________Ordering Information

PART

MAX253CPA

MAX253CSA

MAX253CUA

MAX253C/D

MAX253EPA

MAX253ESA

MAX253ESA/V

MAX253MJA

TEMP RANGE

0°C to +70°C

-40°C to +85°C

-55°C to +125°C

PIN-PACKAGE

8 Plastic DIP

8 SO

The SD pin puts the entire device into a low-power

shutdown state, disabling both the power switches and

oscillator.

8 μMAX

Dice*

________________________Applications

8 Plastic DIP

8 SO

Isolated RS-485/RS-232 Power-Supply

Transformer Driver

8 SO

High Noise-Immunity Communications Interface

Isolated and/or High-Voltage Power Supplies

Bridge Ground Differentials

8 CERDIP**

*Contact factory for dice specifications.

**Contact factory for availability and processing to MIL-STD-883.

Devices are also available in a lead(Pb)-free/RoHS-compliant

package. Specify lead-free by adding a (+) to the part number

when ordering.

Medical Equipment

Process Control

/V Denotes an automotive qualified part.

__________Typical Operating Circuit

ON / OFF

OUTPUT

5V @ 200mA

MAX253

FREQUENCY

SWITCH

GND1

GND2

µMAX is a registered trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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