參數(shù)資料
型號： MAX253
廠商： Maxim Integrated Products, Inc.
英文描述： Transformer Driver for Isolated RS-485 Interface
中文描述： 變壓器驅(qū)動器，用于隔離型RS-485接口
文件頁數(shù)： 1/16頁
文件大?。?/td> 230K
代理商： MAX253
_______________General Desc ription
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.
The SD pin puts the entire device into a low-power
shutdown state, disabling both the power switches and
oscillator.
________________________Applic ations
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
____________________________Features
o
Power-Supply Transformer Driver for Isolated
RS-485/RS-232 Data-Interface Applications
o
Single +5V or +3.3V Supply
o
Low-Current Shutdown Mode: 0.4μA
o
Pin-Selectable Frequency: 350kHz or 200kHz
o
8-Pin DIP, SO, and μMAX Packages
______________Ordering Information
* Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
M
Transformer Driver for
Isolated RS -485 Interfac e
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
1
2
3
4
8
7
6
5
D2
GND2
V
CC
N.C.
SD
FS
GND1
D1
DIP/SO/
μ
MAX
TOP VIEW
MAX253
__________________Pin Configuration
MAX253
D1
D2
FS
GND1
GND2
V
CC
1
8
4
6
2
7
3
V
IN
SD
FREQUENCY
SWITCH
C3
C1
C2
5V @ 200mA
OUTPUT
5V
ON / OFF
__________Typic al Operating Circ uit
19-0226; Rev 0; 1/94
PART
TEMP. RANGE
PIN-PACKAGE
MAX253CPA
0°C to +70°C
8 Plastic DIP
MAX253CSA
0°C to +70°C
8 SO
MAX253CUA
0°C to +70°C
8 μMAX
MAX253C/D
0°C to +70°C
Dice*
MAX253EPA
-40°C to +85°C
8 Plastic DIP
MAX253ESA
-40°C to +85°C
8 SO
MAX253EUA
-40°C to +85°C
8 μMAX
MAX253MJ A
-55°C to +125°C
8 CERDIP**
相關(guān)PDF資料
PDF描述
MAX253EUA Transformer Driver for Isolated RS-485 Interface
MAX253CPA Transformer Driver for Isolated RS-485 Interface
MAX253CSA 4-Line To 16-Line Decoders/Demultiplexers 24-PDIP 0 to 70
MAX253EPA Transformer Driver for Isolated RS-485 Interface
MAX253ESA Transformer Driver for Isolated RS-485 Interface
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