Datasheet > MAX481MAX485

MAX481MAX485

更新时间： 2024-12-02 01:15:15

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美信 - MAXIM		/
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MAX253 Transformer Driver for Isolated RS-485 Interface

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MAX481MAX485 数据手册

MAX253

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.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-0226; Rev 2; 4/10

12 3 4 5 6 7...18

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与MAX481MAX485相关器件

型号	品牌	获取价格	描述	数据表
MAX481MJA	MAXIM	获取价格	Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX481MJA/883B	MAXIM	获取价格	Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, CMOS, CDIP8, CERDIP-8
MAX4820	MAXIM	获取价格	+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface
MAX4820	ADI	获取价格	+3.3V/+5V、8通道、可级联的继电器驱动器，具有串行/并行接口
MAX4820_09	MAXIM	获取价格	+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface
MAX4820_10	MAXIM	获取价格	+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface
MAX4820ETP	MAXIM	获取价格	+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface
MAX4820ETP+	MAXIM	获取价格	+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface
MAX4820ETP+T	MAXIM	获取价格	Buffer/Inverter Based Peripheral Driver, 8 Driver, BICMOS, 4 X 4 MM, 0.80 MM PITCH, MO-220
MAX4820ETP-T	MAXIM	获取价格	暂无描述

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