MAX232系列芯片英文数据手册：低功耗电池供电RS-232系统

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"该资源是一份关于MAX232的英文数据手册，旨在提供查询参考，适用于所有EIA/TIA-232E和V.28/V.24通信接口，尤其在±12V电源不可用时。" MAX232是一款专门设计用于EIA/TIA-232E和V.28/V.24通讯接口的线路驱动器/接收器，主要针对那些没有±12V电源的系统。这一系列的芯片在电池供电的系统中非常有用，因为它们的低功耗关断模式可以将功率损耗降低到5微瓦以下。MAX225、MAX233、MAX235以及MAX245/MAX246/MAX247无需外部组件，非常适合空间有限的印刷电路板应用。应用方面，MAX232家族广泛应用于： 1. 可携带式计算机：由于其小巧的设计和低功耗特性，适合集成在便携式设备中。 2. 低功耗调制解调器：在保持低能耗的同时提供通信功能。 3. 接口转换：在不同接口标准之间进行信号转换，确保兼容性。 4. 电池供电的RS-232系统：在无外部电源的情况下，维持RS-232通信功能。 5. 多级联RS-232网络：允许多个设备通过RS-232接口连接和通信。特性亮点包括： 1. 超过双极性器件性能：能够在单一+5V电源下工作（MAX231/MAX239也可在+5V和+12V下工作）。 2. 低功耗接收模式：在关断状态下，接收模式仍能保持低功耗（MAX223/MAX242）。 3. 遵循所有EIA/TIA-232E和V.28规格：确保与业界标准兼容。 4. 多个驱动器和接收器：支持多个设备同时连接。 5. 三态驱动器和接收器输出：可以灵活控制输出状态。 6. 开线检测功能（MAX243）：能够检测线路是否断开，增强系统的可靠性。订购信息可以在数据表的末尾找到，对于特殊晶片规格，需要直接联系工厂获取。此数据手册还可能包含额外的参数、电气特性、封装信息和推荐的操作条件等内容，对于理解和使用MAX232系列芯片至关重要。

MAX220–MAX249

+5V-Powered, Multichannel RS-232

Drivers/Receivers

_______________________________________________________________________________________ 7

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-

__________________________________________Typical Operating Characteristics

MAX223/MAX230–MAX241

*SHUTDOWN POLARITY IS REVERSED

FOR NON MAX241 PARTS

V+, V- WHEN EXITING SHUTDOWN

(1µF CAPACITORS)

MAX220-13

SHDN*

V-

V+

500ms/div

Input Logic Threshold Low

MAX220–MAX249

+5V-Powered, Multichannel RS-232

Drivers/Receivers

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,10sec) ..............................+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

kbits/sec120 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

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