MAX14945 datasheet(4/21 Pages) MAXIM

Part #	MAX14945

Description	2.75kVRMS Isolated 500kbps Half-Duplex RS-485

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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DC Electrical Characteristics (continued)

(VDDA – VGNDA = 1.71V to 5.5V, VDDB – VGNDB = 4.5V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at

VDDA – VGNDA = 3.3V, VDDB – VGNDB = 5V, VGNDA = VGNDB, and TA = +25°C.) (Notes 2, 3)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Change in Magnitude of

Common-Mode Voltage

ΔVOC

RL = 54Ω (Note 5)

0.2

V

Driver Short-Circuit Output

Current

IOSD

GNDB ≤ VOUT ≤ +12V, output low (Note 6)

+40

+250

mA

-7V ≤ VOUT ≤ VDDB, output high (Note 6)

-250

-40

Driver Short-Circuit Foldback

Output Current

IOSDF

(VDDB – 1V) ≤ VOUT ≤ +12V,

output low (Note 6)

+20

mA

-7V ≤ VOUT ≤ +1V, output high (Note 6)

-20

RECEIVER

Input Current (A and B)

IA, IB

DE = low, VDDB

= GNDB or 5.5V

VIN = +12V

+125

µA

VIN = -7V

-100

Receiver Differential Threshold

Voltage

VTH

-7V ≤ VCM ≤ +12V

-200

-125

-50

mV

Receiver Input Hysteresis

ΔVTH

VCM = 0V

15

mV

Receiver Input Resistance

RIN

-7V ≤ VCM ≤ +12V, DE = low

96

kΩ

PROTECTION

Thermal-Shutdown Threshold

TSHDN

Temperature Rising

+160

°C

Thermal-Shutdown Hysteresis

THYST

15

°C

ESD Protection

(A and B Pins to GNDB)

Human Body Model

±30

kV

IEC 61000-4-2 Air Gap Discharge

±15

IEC 61000-4-2 Contact Discharge

±10

ESD Protection (All Other Pins)

Human Body Model

±4

kV

MAX14945

2.75kVRMS Isolated 500kbps Half-Duplex RS-485/

RS-422 Transceiver with ±30kV ESD Protection

www.maximintegrated.com

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