ST485EB datasheet(6/18 Pages) STMICROELECTRONICS

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Electrical characteristics

ST485EB - ST485EC - ST485EX

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Electrical characteristics

Table 6.

ESD performance: transmitter outputs, receiver inputs

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

ESD

ESD protection voltage

Human body model

±15

ESD

ESD protection voltage

IEC-1000-4-2

±8kV

Table 7.

DC electrical characteristics (VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise

specified. Typical values are referred to TA = 25 °C)

Symbol

Parameter

Test conditions (1)

Min.

Typ.

Max.

Unit

VOD1

Differential driver output (no

load)

VOD2

Differential driver output

(with load)

RL = 27 Ω (RS-485) (Figure 2)

RL = 50 Ω (RS-422) (Figure 2.)

1.5

ΔVOD

Change in magnitude of

driver differential output

voltage for complementary

output states

RL = 27 Ω or 50 Ω (Figure 2)0.2

VOC

Driver common-mode output

voltage

RL = 27 Ω or 50 Ω (Figure 2)3

ΔVOC

Change in magnitude of

driver common-mode output

voltage for complementary

output states

RL = 27 Ω or 50 Ω (Figure 2)0.2

VIH

Input high voltage

RE, DE, DI

2.0

VIL

Input low voltage

RE, DE, DI

0.8

IIN1

Input current

RE, DE, DI

± 2µA

IIN2

Input current (A, B)

VCM = 0 V or 5.25 V, VDE = 0 V

VIN = 12 V

VIN = -7 V

-0.8

VTH

Receiver differential

threshold voltage

VCM = -7 to 12 V

-0.2

0.2

ΔVTH

Receiver input hysteresis

VCM = 0 V

VOH

Receiver output high voltage IO = -4 mA, VID = 200 mV

3.5

VOL

Receiver output low voltage

IO = 4 mA, VID = -200 mV

0.4

IOZR

3-State (high impedance)

output current at receiver

VO = 0.4 to 2.4 V

± 1µA

RIN

Receiver input resistance

VCM = -7 to 12 V

ICC

No load supply current (2)

VRE = 0V or VCC

VDE = VCC

VDE = 0 V

400

300

900

500

µA

IOSD1

Driver short-circuit current,

VO=High

VO = -7 to 12 V

(3)

250

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