MAX485TTL转485芯片.pdf_ttl转485

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Maxim

正式英文资料的译文，

Maxim

不对翻译中存在的差异或由此产生的错误负责。请注意译文中可能存在文字组织或

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。

_______________________________

概述

MAX481

、

MAX483

、

MAX485

、

MAX487-MAX491

以及

MAX1487

是用于

RS-485

与

RS-422

通信的低功耗收发器，

每个器件中都具有一个驱动器和一个接收器。

MAX483

、

MAX487

、

MAX488

以及

MAX489

具有限摆率驱动器，可

以减小

EMI

，并降低由不恰当的终端匹配电缆引起的反射，

实现最高

250kbps

的无差错数据传输。

MAX481

、

MAX485

、

MAX490

、

MAX491

、

MAX1487

的驱动器摆

率不受限制，可以实现最高

2.5Mbps

的传输速率。

这些收发器在驱动器禁用的空载或满载状态下，吸取的

电源电流在

120(A

至

500(A

之间。另外，

MAX481

、

MAX483

与

MAX487

具有低电流关断模式，仅消耗

0.1µA

。所有器件都工作在

单电源下。

驱动器具有短路电流限制，并可以通过热关断电路将驱

动器输出置为高阻状态，防止过度的功率损耗。接收器

输入具有失效保护特性，当输入开路时，可以确保逻辑

高电平输出。

MAX487

与

MAX1487

具有四分之一单位负载的接收器输

入阻抗，使得总线上最多可以有

128

个

MAX487/

MAX1487

收发器。使用

MAX488-MAX491

可以实现全双

工通信，而

MAX481

、

MAX483

、

MAX485

、

MAX487

与

MAX1487

则为半双工应用设计。

_______________________________

应用

低功耗

RS-485

收发器

低功耗

RS-422

收发器

电平转换器

用于

EMI

敏感应用的收发器

工业控制局域网

____________________

下一代器件的特性

♦

容错应用

MAX3430: ±80V

故障保护、失效保护、

1/4

单位

负载、

+3.3V

、

RS-485

收发器

MAX3440E-MAX3444E: ±15kV ESD

保护、

±60V

故障保护、

10Mbps

、失效保护、

RS-485/J1708

收发器

♦

对于空间受限应用

MAX3460-MAX3464: +5V

、失效保护、

20Mbps

、

Profibus RS-485/RS-422

收发器

MAX3362: +3.3V

、高速、

RS-485/RS-422

收发器，

采用

SOT23

封装

MAX3280E-MAX3284E: ±15kV ESD

保护、

52Mbps

、

+3V

至

+5.5V

、

SOT23

、

RS-485/RS-422

、真失效保护接收器

MAX3293/MAX3294/MAX3295: 20Mbps

、

+3.3V

、

SOT23

、

RS-485/RS-422

发送器

♦

对于多通道收发器应用

MAX3030E-MAX3033E: ±15kV ESD

保护、

+3.3V

、四路

RS-422

发送器

♦

对于失效保护应用

MAX3080-MAX3089:

失效保护、高速

(10Mbps)

、

限摆率

RS-485/RS-422

收发器

♦

对于低电压应用

MAX3483E/MAX3485E/MAX3486E/MAX3488E/

MAX3490E/MAX3491E: +3.3V

供电、

±15kV ESD

保护、

12Mbps

、限摆率、真正的

RS-485/RS-422

收发器

MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487

低功耗、限摆率、

RS-485/RS-422

收发器

________________________________________________________________ Maxim Integrated Products 1

_____________________________________________________________________

选择表

19-0122; Rev 8; 10/03

MAX481

MAX483

MAX485

MAX487

MAX488

MAX489

MAX490

MAX491

MAX1487

PART

NUMBER

HALF/FULL

DUPLEX

DATA RATE

(Mbps)

SLEW-RATE

LIMITED

LOW-POWER

SHUTDOWN

RECEIVER/

DRIVER

ENABLE

QUIESCENT

CURRENT

(µA)

NUMBER OF

TRANSMITTERS

ON BUS

COUNT

Half

Full

Half

2.5

0.25

2.5

0.25

2.5

Yes

300

120

300

120

300

230

128

定购信息在本资料的最后给出。

MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487

低功耗、限摆率、

RS-485/RS-422

收发器

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (V

).............................................................12V

Control Input Voltage (RE, DE)...................-0.5V to (V

+ 0.5V)

Driver Input Voltage (DI).............................-0.5V to (V

+ 0.5V)

Driver Output Voltage (A, B)...................................-8V to +12.5V

Receiver Input Voltage (A, B).................................-8V to +12.5V

Receiver Output Voltage (RO).....................-0.5V to (V

+0.5V)

Continuous Power Dissipation (T

= +70°C)

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ....727mW

14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) ..800mW

8-Pin SO (derate 5.88mW/°C above +70°C).................471mW

14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW

8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............830mW

8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW

14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW

Operating Temperature Ranges

MAX4_ _C_ _/MAX1487C_ A ...............................0°C to +70°C

MAX4_ _E_ _/MAX1487E_ A.............................-40°C to +85°C

MAX4_ _MJ_/MAX1487MJA ...........................-55°C to +125°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

DC ELECTRICAL CHARACTERISTICS

= 5V ±5%, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Notes 1, 2)

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.

= -7V

= 12V

= -7V

= 12V

Input Current

(A, B)

IN2

kΩ48-7V ≤ V

≤ 12V, MAX487/MAX1487

Receiver Input Resistance

-7V ≤ V

≤ 12V, all devices except

MAX487/MAX1487

R = 27Ω (RS-485), Figure 4

0.4V ≤ V

≤ 2.4V

R = 50Ω (RS-422)

= 4mA, V

= -200mV

= -4mA, V

= 200mV

= 0V

-7V ≤ V

≤ 12V

DE, DI, RE

MAX487/MAX1487,

DE = 0V, V

= 0V or 5.25V

DE, DI, RE

R = 27Ω or 50Ω, Figure 4

DE = 0V;

= 0V or 5.25V,

all devices except

MAX487/MAX1487

CONDITIONS

kΩ12

µA±1I

OZR

Three-State (high impedance)

Output Current at Receiver

0.4V

Receiver Output Low Voltage

3.5V

Receiver Output High Voltage

mV70∆V

Receiver Input Hysteresis

V-0.2 0.2

Receiver Differential Threshold

Voltage

-0.2

0.25

-0.8

1.0

1.5 5

OD2

Differential Driver Output

(with load)

V5V

OD1

Differential Driver Output (no load)

µA±2I

IN1

Input Current

V0.8V

Input Low Voltage

V2.0V

Input High Voltage

V0.2∆V

Change in Magnitude of Driver

Common-Mode Output Voltage

for Complementary Output States

V0.2∆V

Change in Magnitude of Driver

Differential Output Voltage for

Complementary Output States

V3V

Driver Common-Mode Output

Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487

低功耗、限摆率、

RS-485/RS-422

收发器

_______________________________________________________________________________________ 3

SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487

= 5V ±5%, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Notes 1, 2)

DC ELECTRICAL CHARACTERISTICS (continued)

= 5V ±5%, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Notes 1, 2)

7950V ≤ V

≤ V

OSR

Receiver Short-Circuit Current

mA35 250-7V ≤ V

≤12V (Note 4)I

OSD2

Driver Short-Circuit Current,

= Low

mA35 250-7V ≤ V

≤12V (Note 4)I

OSD1

Driver Short-Circuit Current,

= High

MAX1487,

RE = 0V or V

250 400

350 650

10 30 60t

PHL

Driver Rise or Fall Time

Figures 6 and 8, R

DIFF

= 54Ω, C

= C

= 100pF

MAX490M, MAX491M

MAX490C/E, MAX491C/E 20 90 150

MAX481, MAX485, MAX1487

MAX490M, MAX491M

MAX490C/E, MAX491C/E

MAX481, MAX485, MAX1487

Figures 6 and 8, R

DIFF

= 54Ω,

= C

= 100pF

MAX481 (Note 5)

Figures 5 and 11, C

= 15pF, S2 closed

Figures 5 and 11, C

= 15pF, S1 closed

Figures 5 and 11, C

= 15pF, S2 closed

Figures 5 and 11, C

= 15pF, S1 closed

Figures 6 and 10, R

DIFF

= 54Ω,

= C

= 100pF

Figures 6 and 8,

DIFF

= 54Ω,

= C

= 100pF

Figures 6 and 10,

DIFF

= 54Ω,

= C

= 100pF

CONDITIONS

510t

SKEW

ns50 200 600t

SHDN

Time to Shutdown

Mbps2.5f

MAX

Maximum Data Rate

ns20 50t

Receiver Disable Time from High

10 30 60t

PLH

20 50t

Receiver Disable Time from Low

ns20 50t

Driver Input to Output

Receiver Enable to Output High

ns20 50t

Receiver Enable to Output Low

20 90 200

40 70t

SKD

Driver Disable Time from High

| t

PLH

- t

PHL

| Differential

Receiver Skew

ns40 70t

Driver Disable Time from Low

40 70t

Driver Enable to Output Low

31540

51525

31540

, t

20 90 200

Driver Output Skew to Output

PLH

, t

PHL

Receiver Input to Output

40 70t

Driver Enable to Output High

UNITSMIN TYP MAXSYMBOLPARAMETER

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

230 400

300 500

MAX481/MAX485,

RE = 0V or V

500 900

MAX490/MAX491,

DE, DI, RE = 0V or V

300 500

MAX488/MAX489,

DE, DI, RE = 0V or V

120 250

DE = V

300 500DE = 0V

DE = V

DE = 0V

µA

MAX481/483/487, DE = 0V, RE = V

0.1 10I

SHDN

Supply Current in Shutdown

120 250

No-Load Supply Current

(Note 3)

DE = 5V

DE = 0V

MAX483

MAX487

MAX483/MAX487,

RE = 0V or V

Figures 7 and 9, C

= 100pF, S2 closed

Figures 7 and 9, C

= 100pF, S1 closed

Figures 7 and 9, C

= 15pF, S1 closed

Figures 7 and 9, C

= 15pF, S2 closed

µA

MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487

低功耗、限摆率、

RS-485/RS-422

收发器

4 _______________________________________________________________________________________

SWITCHING CHARACTERISTICS—MAX483, MAX487/MAX488/MAX489

= 5V ±5%, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Notes 1, 2)

SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (continued)

= 5V ±5%, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Notes 1, 2)

300 1000

Figures 7 and 9, C

= 100pF, S2 closed

Figures 7 and 9, C

= 100pF, S1 closed

Figures 5 and 11, C

= 15pF, S2 closed,

A - B = 2V

CONDITIONS

ns40 100t

ZH(SHDN)

Driver Enable from Shutdown to

Output High (MAX481)

Figures 5 and 11, C

= 15pF, S1 closed,

B - A = 2V

ZL(SHDN)

Receiver Enable from Shutdown

to Output Low (MAX481)

ns40 100t

ZL(SHDN)

Driver Enable from Shutdown to

Output Low (MAX481)

ns300 1000t

ZH(SHDN)

Receiver Enable from Shutdown

to Output High (MAX481)

UNITSMIN TYP MAXSYMBOLPARAMETER

PLH

SKEW

Figures 6 and 8, R

DIFF

= 54Ω,

= C

= 100pF

PHL

Figures 6 and 8, R

DIFF

= 54Ω,

= C

= 100pF

Driver Input to Output

Driver Output Skew to Output ns100 800

ns2000

MAX483/MAX487, Figures 7 and 9,

= 100pF, S2 closed

ZH(SHDN)

Driver Enable from Shutdown to

Output High

250 2000

ns2500

MAX483/MAX487, Figures 5 and 11,

= 15pF, S1 closed

ZL(SHDN)

Receiver Enable from Shutdown

to Output Low

ns2500

MAX483/MAX487, Figures 5 and 11,

= 15pF, S2 closed

ZH(SHDN)

Receiver Enable from Shutdown

to Output High

ns2000

MAX483/MAX487, Figures 7 and 9,

= 100pF, S1 closed

ZL(SHDN)

Driver Enable from Shutdown to

Output Low

ns50 200 600MAX483/MAX487 (Note 5) t

SHDN

Time to Shutdown

PHL

PLH

, t

PHL

< 50% of data period

Figures 5 and 11, C

= 15pF, S2 closed

Figures 5 and 11, C

= 15pF, S1 closed

Figures 5 and 11, C

= 15pF, S2 closed

Figures 5 and 11, C

= 15pF, S1 closed

Figures 7 and 9, C

= 15pF, S2 closed

Figures 6 and 10, R

DIFF

= 54Ω,

= C

= 100pF

Figures 7 and 9, C

= 15pF, S1 closed

Figures 7 and 9, C

= 100pF, S1 closed

Figures 7 and 9, C

= 100pF, S2 closed

CONDITIONS

kbps250f

MAX

250 800 2000

Maximum Data Rate

ns20 50t

Receiver Disable Time from High

250 800 2000

20 50t

Receiver Disable Time from Low

ns20 50t

Receiver Enable to Output High

ns20 50t

Receiver Enable to Output Low

100

300 3000t

SKD

Driver Disable Time from High

I t

PLH

- t

PHL

I Differential

Receiver Skew

Figures 6 and 10, R

DIFF

= 54Ω,

= C

= 100pF

ns300 3000t

Driver Disable Time from Low

ns250 2000t

Driver Enable to Output Low

Figures 6 and 8, R

DIFF

= 54Ω,

= C

= 100pF

ns250 2000t

, t

250 2000

Driver Rise or Fall Time

PLH

Receiver Input to Output

250 2000t

Driver Enable to Output High

UNITSMIN TYP MAXSYMBOLPARAMETER

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