MAX220-MAX249系列RS-232驱动/接收器详解及应用

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"MAX220-MAX249是一系列+5V供电的多通道RS-232驱动器/接收器，设计用于在工业和通信系统中进行串行数据传输。这些设备由Maxim Integrated公司生产，遵循EIA/TIA-232E标准，支持V.28/V.24接口，并能处理高达12V的电压。它们适用于不同温度范围，包括0°C至+70°C、-40°C至+85°C以及-55°C至+125°C，以满足不同环境条件的需求。该系列器件包括多个版本，如MAX220CPE+、MAX220CSE+、MAX220CWE+等，分别采用塑料DIP、窄型或宽型SO封装，以及MAX220C/D、MAX220EPE+、MAX220ESE+等，针对不同的工作温度范围和封装选择。MAX220EJE和MAX220MJE则提供了陶瓷DIP和更宽的温度范围。 MAX225、MAX233、MAX235、MAX245/MAX246/MAX247等是该系列的其他成员，它们各自有特定的特性，如MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E系列针对低电压、集成ESD保护和低功耗设计，最高数据速率可达1Mbps，支持UCSPTM封装。MAX221E则是一款低成本选项，它具备±15kV ESD保护、+5V供电、极低的1μA电流消耗，以及自动关断（AutoShutdownTM）功能，集成了完整的RS-232收发器功能。这些器件广泛应用于工业自动化、嵌入式系统、仪器仪表、通信设备等场合，特别适合需要稳定、可靠的串行通信的场景。它们在设计时考虑了各种性能和成本优化，以适应不同应用的需求。"

MAX220–MAX249

+5V

供电Ă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

160kb/s

80kb/s

20kb/s

= +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

160kb/s

80kb/s

20kb/s

= +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

MAX220–MAX249

+5V

供电Ă多通道

RS-232

驱动器

接收器

8 _______________________________________________________________________________________

Input Logic-Low Voltage

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

otherwise noted.) (Note 7)

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.

(Voltages referenced to GND.)

Supply Voltage (V

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

Input Voltages

TIN‚ ENA, ENB, ENR, ENT, ENRA,

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

+ 0.3V)

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

TOUT (Note 6)....................................................................±15V

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

+ 0.3V)

Short Circuit Duration (one output at a time)

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

ROUT 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

Soldering Temperature (reflow)

40 PDIP (P40M-2) ..........................................................+225°C

All other lead(Pb)-free packages...................................+260°C

All other packages containing lead(Pb) ........................+240°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

, V

ENB

, V

ENT

, V

ENTA

ENTB

= V

CC,

OUT

= ±15V

VRS-232 Input Hysteresis

RS-232 Input Logic-Low Voltage V

V±5 ±7.5Output Voltage Swing

Output Leakage Current (Shutdown)

±0.01 ±25

Ω300 10MV

= V+ = V- = 0V, V

OUT

= ±2V (Note 8)Transmitter Output Resistance

μA

PARAMETER

±0.05 ±0.10

MIN TYP MAX UNITS

Normal operation, outputs disabled,

Tables 1a–1d, 0V ≤ V

OUT

≤ V

, V

ENR_

= V

TTL/CMOS Output Leakage Current

10 30Sinking V

OUT

= V

-2 -10Sourcing V

OUT

= V

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 Pullup/lnput Current

10 50

Tables 1a–1d

RS-232 Input Logic-High Voltage

V2 1.4Input Logic-High Voltage

RS-232 TRANSMITTERS

RS-232 RECEIVERS

Note 6: Input voltage measured with transmitter output in a high-impedance state, shutdown, or V

= 0V.

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