MAX3480A 查看數據表（PDF） - Maxim Integrated

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MAX3480A

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface

Maxim Integrated 

Complete, Isolated, 3.3V

RS-485/RS-422 Data Interface

ABSOLUTE MAXIMUM RATINGS

With Respect to GND:

Supply Voltage (VCC1, VCC2, VCC4, VCC5) .........-0.3V to +3.8V

Supply Voltage (VCC3) ..........................................-0.3V to +7V

Control Input Voltage (SD, FS) ................-0.3V to (VCC + 0.3V)

Receiver Output Voltage (RO).................-0.3V to (VCC + 0.3V)

With Respect to ISO COM:

Control Input Voltage (ISO DE _) .........-0.3V to (ISO VCC + 0.3V)

Driver Input Voltage (ISO DI _).........-0.3V to (ISO VCC + 0.3V)

Receiver Output Voltage (ISO RO _) ......-0.3V to (ISO VCC + 0.3V)

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

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

LED Forward Current (DI, DE, ISO RO LED) ......................50mA

Continuous Power Dissipation (TA = +70°C)

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

Operating Temperature Ranges

MAX3480_CPI ......................................................0°C to +70°C

MAX3480_EPI ...................................................-40°C to +85°C

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

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

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.

ELECTRICAL CHARACTERISTICS

(VCC = VCC1 = VCC2 = VCC4 = VCC5 = 3.0V to 3.6V, FS = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at

VCC = VCC1 = VCC2 = VCC4 = VCC5 = 3.3V and TA = +25°C.) (Notes 1, 2, 3)

PARAMETER

Supply Voltage

Switch Frequency

Operating Supply Current

Shutdown Supply Current (Note 3)

FS Input Threshold

FS Input Pull-Up Current

FS Input Leakage Current

Input High Voltage

Input Low Voltage

Isolation Resistance

Isolation Capacitance

Differential Driver Output (no load)

Differential Driver Output (with load)

SYMBOL

CONDITIONS

VS

fSWL FS = 0V

fSWH FS = VCC or open

MAX3480A,

RL = ∞

ICC

DE´ = VCC or open RL = 54Ω

MAX3480B,

RL = ∞

DE´ = VCC or open RL = 54Ω

ISHDN SD = VCC3

VFSH High

VFSL Low

IFSL FS low

IFSM FS high

VIH DE´, DI´ (Figure 1)

VIL DE´, DI´ (Figure 1)

RISO TA = +25°C, VISO = 50VDC

CISO TA = +25°C, VISO = 50VDC

VOD1

VOD2

R = 50Ω (RS-422)

R = 27Ω (RS-485), Figure 3

MIN TYP

3.0

3.3

600

900

180

280

120

240

0.2

2.4

10

VCC - 0.4

100 10,000

10

2

1.5

MAX

3.6

260

200

0.8

50

0.4

8

5

UNITS

V

kHz

mA

µA

V

µA

pA

V

V

MΩ

pF

V

V

Change in Magnitude of Driver

Output Voltage for Complementary

Output States

Driver Common-Mode Output

∆VOD

VOC

R = 27Ω or 50Ω,

Figure 3

Differential

Common Mode

R = 27Ω or 50Ω, Figure 4

0.3

V

0.3

4

V

2 _______________________________________________________________________________________

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