低功耗RS-232接口驱动器/接收器：MAX220-MAX249家族

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"MAX220到MAX249系列是EIA/TIA-232E和V.28/V.24通信接口的线性驱动器/接收器，特别适用于无法提供±12V电源的应用。这些器件在电池供电系统中非常有用，因为它们的低功耗关断模式可将功率损耗降低到5µW以下。其中，MAX225、MAX233、MAX235和MAX245/MAX246/MAX247在无需外部组件的情况下工作，适合电路板空间有限的应用。该系列芯片广泛应用于便携式计算机、低功耗调制解调器、接口转换、电池供电的RS-232系统以及多路复用RS-232网络等。" 这部分内容详细介绍了MAX220至MAX249家族的特性及应用。这些器件是专为满足那些无法提供标准±12V电压的EIA/TIA-232E和V.28/V.24通信接口设计的。由于其低功耗关断模式，它们在电池供电系统中表现出色，能极大地减少待机时的功率消耗。对于那些对电路板空间有严格要求的应用，如便携式计算机和空间紧凑的电子设备，MAX225、MAX233、MAX235和MAX245/MAX246/MAX247是理想的选择，因为它们无需额外的外部元件即可正常工作。此外，提到了一些具有特定功能的器件，例如MAX3222E、MAX3232E、MAX3237E、MAX3241E和MAX3246E，它们可在+3.0V至+5.5V的低电压下工作，最大数据传输速率可达1Mbps，并且仅需四个0.1µF的外部电容。MAX3246E甚至采用了UCSP™封装，进一步减小了体积。另一个值得一提的是MAX221E，它是一款±15kV ESD保护的+5V单通道RS-232收发器，具有AutoShutdown™功能，功耗仅为1µA，适用于低成本应用。整个MAX220到MAX249系列都是5V供电的多通道RS-232驱动器/接收器，它们提供了不同级别的集成度、ESD保护和功耗优化，以满足各种工业、商业和消费类电子产品的通信需求。无论是用于提高电池寿命的便携式设备，还是在节省电路板空间方面有严格要求的设计，这些器件都提供了解决方案，确保了在RS-232通信中的高效和可靠性。

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 = 1

TRANSMITTER

LOADS =

|| 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

= +5V

3 TRANSMITTERS LOADED

= 3k

C1–C4 = 1

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

= 3k

C1–C4 = 1

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 = 1

TRANSMITTER

LOADS =

|| 2500pF

1 TRANS-

MITTER

LOADED

2 TRANS-

MITTERS

LOADED

3 TRANS-

MITTERS

LOADED

-6.0

-7.6

02500

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

= +5V

3 TRANSMITTERS LOADED

= 3k

C1–C4 = 1

-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 = 1

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.)

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 5).....................................................................±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) (Note 6) ....................+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 7)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 Pullup/lnput Current

10 50

Tables 1a–1d

RS-232 Input Threshold High

V2 1.4Input Logic Threshold High

RS-232 TRANSMITTERS

RS-232 RECEIVERS

Note 5: Input voltage measured with transmitter output in a high-impedance state, shutdown, or V

= 0V.

Note 6: Maximum reflow temperature for the MAX225/MAX245/MAX246/MAX247 is +225°C.

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