MAX232ACPE：低功耗串口电平转换芯片详解

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MAX232ACPE芯片手册是一份详细介绍MAX220-MAX249系列线性驱动器/接收器的专业文档，专注于EIA/TIA-232E和V.28/V.24通信接口。这些器件特别适用于对电源需求有限的场景，如便携式计算机、低功耗调制解调器以及电池供电的RS-232系统，因为它们能够提供低至5微瓦的极低功耗模式，这对于能源效率和系统设计至关重要。该芯片系列的特点包括： 1. 卓越性能：与双极型器件相比，MAX232ACPE系列在性能上具有优势，确保了更稳定和高效的通信。 2. 单电源支持：所有器件都能从单一的+5V电源工作，对于空间受限的应用，比如MAX231/MAX239，甚至可以处理+5V和+12V电压范围。 3. 低功耗接收模式：MAX223/MAX242型号具备一个特殊的低功耗接收模式，在休眠状态下能显著降低功耗。 4. 全面兼容标准：完全符合EIA/TIA-232E和V.28规范，保证了设备间的兼容性和互操作性。 5. 多功能集成：芯片集成了多个驱动器和接收器，简化了电路设计，减少了外部组件的需求。 6. 3-态输出：提供3-态驱动器输出，可防止信号短路，保护连接设备。 7. 开放线路检测：MAX243型号还具备开放线路检测功能，有助于检测数据传输中的异常情况。订购信息部分指出，具体晶圆尺寸规格需向工厂查询，并且在数据手册的末尾提供了后续的详细信息。这意味着在选择和应用这些芯片时，用户可能需要根据特定的应用需求和性能指标来确定最适合的型号。 MAX232ACPE芯片手册为开发人员提供了一套完整的解决方案，以实现高效、低功耗的串口通信，广泛应用于移动计算、无线通信以及其他对电源管理和通信质量有严格要求的场合。在设计电子系统时，这款芯片是提高通信效率和降低成本的理想选择。

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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