MAX220-MAX249系列RS-232通信芯片技术规格与应用

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"MAX220-MAX249手册" MAX220-MAX249系列芯片是Maxim Integrated公司推出的一系列串行通信接口集成电路，主要用于实现TIA/EIA-232标准的RS-232通信。这些芯片在设计上旨在提供高效能的信号转换，将微处理器或数字电路的TTL/CMOS电平转换为RS-232兼容的±12V电平，以确保长距离、高质量的数据传输。这些芯片的关键特性包括： 1. **供电电压**：通常支持+5V供电，能够满足不同应用场景的需求。例如，MAX220系列芯片可以在0°C到+70°C的温度范围内工作，而扩展温度范围的版本如MAX220E系列则能在-40°C到+85°C的环境下稳定运行，甚至MAX220MJE可在更极端的-55°C到+125°C温度区间内正常工作。 2. **通道数量**：MAX220系列芯片提供了多通道的RS-232驱动器和接收器，适用于需要多个串行接口的系统。 3. **封装形式**：有多种封装选项，包括16引脚塑料双列直插式(DIP)、窄小外形封装(Narrow SO)和宽外形封装(Wide SO)，以及用于更严苛环境的陶瓷双列直插式(CERDIP)封装。 4. **低功耗**：MAX220系列芯片在待机或空载时，功率消耗极低，如提到的MAX225、MAX233、MAX235等型号，它们在低电压条件下也能保持低功耗，适合电池供电或节能设备使用。 5. **ESD保护**：针对低电压、集成ESD保护的应用，新一代器件如MAX3222E、MAX3232E、MAX3237E、MAX3241E和MAX3246E等，提供了增强的静电放电防护功能，提高了系统的抗干扰能力。 6. **应用广泛**：这些芯片广泛应用于各种电子设备中，包括数据终端设备(DTE)和数据通信设备(DCE)，如调制解调器、打印机、路由器、PC及其他嵌入式系统，实现串行通信接口。 7. **购买与支持**：用户可以通过Maxim的亚洲销售中心或官方网站获取价格、供货和订购信息，以便于产品设计和采购。 MAX220-MAX249系列芯片是实现RS-232通信的标准部件，其高可靠性、低功耗和多种封装选择使其成为各种工业和消费级应用的理想选择。

+5V

供电Ă多通道

RS-232

驱动器

接收器

_______________________________________________________________

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

V+, V- WHEN EXITING SHUTDOWN

(1μF CAPACITORS)

MAX220-13

SHDN

V-

V+

500ms/div

MAX220–MAX249

Maxim Integrated

+5V

供电Ă多通道

RS-232

驱动器

接收器

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.

MAX220–MAX249

Maxim Integrated

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