MAX3157CAI View Datasheet(PDF) - Maxim Integrated

Part Name

Description

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MAX3157CAI

High CMRR RS-485 Transceiver with ±50V Isolation

Maxim Integrated 

High CMRR RS-485 Transceiver

with ±50V Isolation

ABSOLUTE MAXIMUM RATINGS

All voltages referenced to GND unless otherwise noted.

Supply Voltage (VCC).............................................................+7V

Cable Ground (ISOCOM) ....................................................±75V

Isolated Supply ISOVCC Relative to Cable Ground

(ISOCOM) ............................................................................+7V

Digital Input, Output Voltage

(DI, DE, RE, TXP, RXP, RO)......................-0.3V to (VCC + 0.3V)

Digital Inputs (H/F) Relative to Cable Ground

(ISOCOM) ..........................................-0.3V to (ISOVCC + 0.3V)

Driver Output Voltage (Y, Z), Relative to Cable Ground

(ISOCOM).............................................................-8V to +12.5V

Receiver Input Voltage (A, B), Relative to Cable Ground

(ISOCOM).............................................................-8V to +12.5V

Termination Connections (YR, ZR, AR, BR) Relative to Cable

Ground (ISOCOM)................................................-8V to +12.5V

Charge-Pump Capacitance Low

(C1LO, C2LO) .......................................-0.3V to (VCC + 0.3V)

Charge-Pump Capacitance High (C1HI, C2HI) Relative

to Cable Ground (ISOCOM) ...........-0.3V to (ISOVCC + 0.3V)

Continuous Power Dissipation

28-Pin SSOP (derate 10.8mW/°C above +70°C) ........860mW

28-Pin PDIP (derate 14.3mW/°C above +70°C)........1143mW

Operating Temperature Ranges

MAX3157C_I .....................................................0°C to +70°C

MAX3157E_I ..................................................-40°C to +85°C

Junction Temperature ......................................................+150°C

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

Lead Temperature (soldering, 10s) ................................+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 = +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF, TA = TMIN to TMAX, unless otherwise noted.

Typical values are at VCC = +5V and TA = +25°C.) (Note 1)

PARAMETER

DRIVER

Differential Driver Output,

No Load

Differential Driver Output,

Loaded

Change in Magnitude of

Differential Output Voltage

(Note 2)

SYMBOL

CONDITIONS

VOD1

VOD2

Figure 1, R = 10MΩ

Figure 1, R = 50Ω (RS-422)

Figure 1, R = 27Ω (RS-485)

∆VOD Figure 1, R = 50Ω or R = 27Ω

MIN TYP MAX UNITS

6

V

2.0

V

1.5

0.2

V

Driver Common-Mode Voltage

Change in Magnitude of

Common-Mode Voltage

(Note 2)

VOC

Figure 1, R = 50Ω or R = 27Ω,

VOC relative to ISOCOM

∆VOC Figure 1, R = 50Ω or R = 27Ω

3.5

V

0.2

V

Input High Voltage

Input Low Voltage

DI Input Hysteresis

Input Current

Input Current (A and B)

VIH

DE, DI, RE, TXP, RXP, relative to GND,

H/F relative to ISOCOM

2.0

V

VIL

DE, DI, RE, TXP, RXP, relative to GND,

H/F relative to ISOCOM

0.8

V

VHYS

100

mV

IIN1

DE, DI, RE

IIN2

H/F, TXP, RXP internal pulldown

±2

µA

10

40

DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN - -5.0

VISOCOM) ≤ 12V, AR = BR = ISOCOM

IIN3

DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN -

VISOCOM) ≤ 12V, AR open, BR open

-0.58

8.0

mA

1.0

2 _______________________________________________________________________________________

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