MAX232中文资料：低功耗串口解决方案

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MAX232中文资料是一份详细介绍MAX220-MAX249系列线驱动器/接收器的文档，该系列芯片专为EIA/TIA-232E和V.28/V.24通信接口设计，特别适用于那些无法提供±12V电源的应用场景，例如电池供电系统，因为它们拥有极低的功耗，关断模式下功耗可降至5微瓦以下。MAX225、MAX233、MAX235以及MAX245/MAX246/MAX247是无需额外元件的理想选择，特别适合于电路板空间受限的项目。 MAX232芯片的应用范围广泛，包括便携式计算机的串口通信、低功耗调制解调器接口、电池供电的RS-232系统以及多点RS-232网络。对于新一代设备，可能需要更高性能的版本，如MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E，这些芯片支持+3.0V至+5.5V工作电压，低功耗且最高数据传输速率达到1Mbps，甚至提供真正的RS-232收发器功能（MAX3246E型号），并采用UCSPTM封装。对于成本敏感的项目，MAX221E是一个合适的选择，它具备±15kV ESD保护，工作在+5V电压下，电流消耗极低，仅1μA，还具备自动关机（AutoShutdown）功能，实现单芯片RS-232解决方案。MAX220-MAX249系列则提供+5V供电，支持多通道RS-232驱动器/接收器，不同型号如MAX220CPE、MAX220CSE、MAX220CWE等，根据温度范围和封装类型（如16Pin Plastic Dip、16 Narrow SO或16 Wide SO）选择合适的器件。 MAX232系列芯片在串口通信领域提供了多样化的选择，满足不同应用场景的需求，无论是对功耗控制严格的移动设备，还是对成本和易用性有较高要求的产品，都有相应的优化型号来适配。选择时需考虑温度范围、封装形式以及具体功能需求。

MAX220–MAX249

+5V

供电、多通道

RS-232

驱动器

接收器

_______________________________________________________________________________________ 7

_______________________________________________________________

典型工作特性

MAX223/MAX230–MAX241

8.5

6.5

4.5 5.5

TRANSMITTER OUTPUT

VOLTAGE (V

) vs. V

7.0

8.0

MAX220-04

(V)

5.0

7.5

1 TRANSMITTER

LOADED

3 TRANS-

MITTERS

LOADED

4 TRANSMITTERS

LOADED

2 TRANSMITTERS

LOADED

= +25°C

C1–C4 = 1µF

TRANSMITTER

LOADS =

3kΩ || 2500pF

7.4

6.0

0 2500

TRANSMITTER OUTPUT VOLTAGE (V

)

vs. LOAD CAPACITANCE AT

DIFFERENT DATA RATES

6.4

6.2

7.2

7.0

MAX220-05

LOAD CAPACITANCE (pF)

(V)

15001000500 2000

6.8

6.6

160kbits/sec

80kbits/sec

20kbits/sec

= +25°C

= +5V

3 TRANSMITTERS LOADED

= 3kΩ

C1–C4 = 1µF

12.0

4.0

0 2500

TRANSMITTER SLEW RATE

vs. LOAD CAPACITANCE

6.0

5.0

11.0

9.0

10.0

MAX220-06

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

15001000500 2000

8.0

7.0

= +25°C

= +5V

LOADED, R

= 3kΩ

C1–C4 = 1µF

1 TRANSMITTER LOADED

2 TRANSMITTERS

LOADED

3 TRANSMITTERS

LOADED

4 TRANSMITTERS

LOADED

-6.0

-9.0

4.5 5.5

TRANSMITTER OUTPUT

VOLTAGE (V

) vs. V

-8.0

-8.5

-6.5

-7.0

MAX220-07

(V)

5.0

-7.5

4 TRANS-

MITTERS

LOADED

= +25°C

C1–C4 = 1µF

TRANSMITTER

LOADS =

3kΩ || 2500pF

1 TRANS-

MITTER

LOADED

2 TRANS-

MITTERS

LOADED

3 TRANS-

MITTERS

LOADED

-6.0

-7.6

0 2500

TRANSMITTER OUTPUT VOLTAGE (V

)

vs. LOAD CAPACITANCE AT

DIFFERENT DATA RATES

-7.0

-7.2

-7.4

-6.2

-6.4

MAX220-08

LOAD CAPACITANCE (pF)

(V)

15001000500 2000

-6.6

-6.8

160kbits/sec

80kbits/sec

20Kkbits/sec

= +25°C

= +5V

3 TRANSMITTERS LOADED

= 3kΩ

C1–C4 = 1µF

-10

0 5 10 15 20 25 30 35 40 45 50

TRANSMITTER OUTPUT VOLTAGE (V+, V-)

vs. LOAD CURRENT

-2

-6

-4

-8

MAX220-09

CURRENT (mA)

V+, V- (V)

V+ AND V-

EQUALLY

LOADED

V- LOADED,

NO LOAD

ON V+

= +25°C

= +5V

C1–C4 = 1µF

ALL TRANSMITTERS UNLOADED

V+ LOADED,

NO LOAD

ON V-

*SHUTDOWN POLARITY IS REVERSED

FOR NON MAX241 PARTS

V+, V- WHEN EXITING SHUTDOWN

(1µF CAPACITORS)

MAX220-13

SHDN*

V-

V+

500ms/div

http://www.838dz.com

Input Logic Threshold Low

MAX220–MAX249

+5V

供电、多通道

RS-232

驱动器

接收器

8 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249

ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249

(MAX225, V

= 5.0V ±5%; MAX244–MAX249, V

= +5.0V ±10%, external capacitors C1–C4 = 1µF; T

= T

MIN

to T

MAX

; unless oth-

erwise noted.)

Note 4: Input voltage measured with transmitter output in a high-impedance state, shutdown, or V

= 0V.

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.

Supply Voltage (V

) ...............................................-0.3V to +6V

Input Voltages

‚ ENA, ENB, ENR, ENT, ENRA,

ENRB, ENTA, ENTB..................................-0.3V to (V

+ 0.3V)

.....................................................................................±25V

OUT

(Note 3).....................................................................±15V

OUT

........................................................-0.3V to (V

+ 0.3V)

Short Circuit (one output at a time)

OUT

to GND ............................................................Continuous

OUT

to GND............................................................Continuous

Continuous Power Dissipation (T

= +70°C)

28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W

40-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...611mW

44-Pin PLCC (derate 13.33mW/°C above +70°C) ...........1.07W

Operating Temperature Ranges

MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C

MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering,10s) ..................................+300°C

= 0V,

OUT

= ±15V

µATables 1a–1d

±0.01 ±25

Normal operation

Shutdown

Tables 1a–1d, normal operation

All transmitter outputs loaded with 3kΩ to GND

ENA, ENB, ENT, ENTA, ENTB =

CC,

OUT

= ±15V

VRS-232 Input Hysteresis

RS-232 Input Threshold Low V

V±5 ±7.5Output Voltage Swing

Output Leakage Current (Shutdown)

±0.01 ±25

Ω300 10MV

= V+ = V- = 0V, V

OUT

= ±2V (Note 4)Transmitter Output Resistance

µA

PARAMETER

±0.05 ±0.10

MIN TYP MAX UNITS

Normal operation, outputs disabled,

Tables 1a–1d, 0V ≤ V

OUT

≤ V

, ENR_ = V

TTL/CMOS Output Leakage Current

10 30Shrinking V

OUT

= V

-2 -10Sourcing V

OUT

= GND

V3.5 V

- 0.2I

OUT

= -1.0mATTL/CMOS Output Voltage High

V0.2 0.4I

OUT

= 3.2mATTL/CMOS Output Voltage Low

kΩ357

0.2 0.5 1.0V

= 5V

1.4 0.8 V

TTL/CMOS Output Short-Circuit Current

V1.8 2.4

0.8 1.3V

= 5V

RS-232 Input Resistance

V±25RS-232 Input Voltage Operating Range

mA±7 ±30V

OUT

= 0VOutput Short-Circuit Current

kbps120 64Data Rate

CONDITIONS

= 5V

µA

±0.01 ±1

Logic Pull-Up/lnput Current

10 50

Tables 1a–1d

RS-232 Input Threshold High

V2 1.4Input Logic Threshold High

RS-232 TRANSMITTERS

RS-232 RECEIVERS

http://www.838dz.com

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