Case Temperature (°C)

0

50

100

150

200

0

50

100

150

200

250

300

D001

VCC1 = VCC2 = 3.6 V

ISO15, ISO35, ISO15M, ISO35M

www.ti.com

SLOS580G – MAY 2008 – REVISED MARCH 2015

9.3.5 Safety-Limiting Values

Safety limiting intends to prevent potential damage to the isolation barrier upon failure of input or output circuitry.

A failure of the I/O can allow low resistance to ground or the supply and, without current limiting, dissipate

sufficient power to overheat the die and damage the isolation barrier potentially leading to secondary system

failures.

PARAMETER

MIN

TYP

MAX

UNIT

θJA = 168 °C/W, VI = 3.6 V, TJ =

IS

Safety input, output, or supply current

DW-16

240

mA

170°C, TA = 25°C

TS

Maximum case temperature

DW-16

150

°C

The safety-limiting constraint is the absolute maximum junction temperature specified in the absolute maximum

ratings table. The power dissipation and junction-to-air thermal impedance of the device installed in the

application hardware determines the junction temperature. The assumed junction-to-air thermal resistance in

Thermal Information is that of a device installed in a Low-Effective Thermal Conductivity Test Board for Leaded

Surface Mount Packages and is conservative. The power is the recommended maximum input voltage times the

current. The junction temperature is then the ambient temperature plus the power times the junction-to-air

thermal resistance.

Figure 16. DW-16

θJC Thermal Derating Curve per VDE

9.4 Device Functional Modes

Table 1. Driver Function Table(1)

INPUT

ENABLE INPUT

OUTPUTS(2)

(D)

(DE)

VCC1

VCC2

Y / A

Z / B

PU

PU

H

H

H

L

PU

PU

L

H

L

H

PU

PU

X

L

Hi-Z

Hi-Z

PU

PU

X

OPEN

Hi-Z

Hi-Z

PU

PU

OPEN

H

H

L

PD

PU

X

X

Hi-Z

Hi-Z

PU

PD

X

X

Hi-Z

Hi-Z

PD

PD

X

X

Hi-Z

Hi-Z

(1)

PU = Powered Up; PD = Powered Down; H = Logic High; L= Logic Low; X = Irrelevant, Hi-Z = High Impedance (off)

(2)

Driver output pins are Y and Z for full-duplex devices and A & B for half-duplex devices.

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