ISO35T datasheet(4/25 Pages) TI1

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ISO35T

SLLSE26C

– NOVEMBER 2010 – REVISED AUGUST 2011

www.ti.com

RS-485 DRIVER ELECTRICAL CHARACTERISTICS

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IO = 0 mA (No Load)

2.5

VCC2

RL = 54 Ω (RS-485), See Figure 1

1.5

|VOD|

Differential output voltage magnitude

RL = 100 Ω (RS-422)

(1), See Figure 1

2.3

Vtest = –7 V to +12 V, See Figure 2

1.5

Change in magnitude of the differential output

Δ|VOD|

See Figure 1 and Figure 2

–0.2

0.2

voltage

VOC(SS)

Steady-state common-mode output voltage

2.6

Figure 3

Change in steady-state common-mode output

ΔVOC(SS)

–0.1

0.1

voltage

VOC(pp)

Peak-to-peak common-mode output voltage

See Figure 3

0.25

Input current, D

& DE

VI at 0 V or VCC1

–10

µA

VY or VZ = 12V,

VCC = 0 V or 3 V,

DE = 0 V

Other input

IOZ

High-impedance state output current

µA

at 0 V

VY or VZ = –7 V,

VCC = 0 V or 3 V,

–10

DE = 0 V

IOS(P)

(2)

Peak short-circuit output current

300

VY or VZ = –7 V to +12 V,

Other input

See Figure 4

at 0 V

IOS(SS)

(2)

Steady-state short-circuit output current

-250

250

VI = 0.4 sin (4E6πt) + 0.5V,

C(OD)

Differential output capacitance

DE at 0 V

(1)

VCC2 = 3.3 V ± 5%

(2)

This device has thermal shutdown and output current-limiting features to protect in short-circuit fault condition.

RS-485 DRIVER SWITCHING CHARACTERISTICS

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH, tPHL

Propagation delay

See Figure 5

205

340

tsk(p)

Pulse skew (|tPHL – tPLH|)

1.5

Differential output signal rise time

120

185

300

Differential output signal fall time

120

180

300

tPHZ

Propagation delay, high-level-to-high-impedance output

See Figure 6

205

tPZH

Propagation delay, high-impedance-to-high-level output

530

tPLZ

Propagation delay, low-level to high-impedance output

See Figure 7

330

tPZL

Propagation delay, high-impedance-to-low-level output

530

RS-485 RECEIVER ELECTRICAL CHARACTERISTICS

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIT(+)

Positive-going input threshold voltage

IO = -8 mA

–20

VIT(–)

Negative-going input threshold voltage

IO = 8 mA

–200

Vhys

Hysteresis voltage (VIT+ – VIT–)

VID = +200 mV, IO = -8

VOH

High-level output voltage

2.4

See Figure 8

VID = –200 mV, IO = 8

VOL

Low-level output voltage

0.4

IO(Z)

High-impedance state output current

VO = 0 or VCC1, RE = VCC1

–1

µA

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