ST485ER datasheet(6/19 Pages) STMICROELECTRONICS

6 / 19 page

Electrical characteristics

ST485ER

6/19

Electrical characteristics

4.1

DC Electrical characteristics

VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred

to TA = 25°C)

Table 5.

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 6.

DC Electrical characteristics

Symbol

Parameter

Test conditions (1)

Min.

Typ.

Max.

Unit

VOD1

Differential driver output (no

load)

VOD2

Differential driver output

(with load)

RL = 27Ω (RS-485) (Figure 2.)

RL = 50Ω (RS-422) (Figure 2.)

1.5

∆VOD

Change in magnitude of

driver differential output

voltage for complementary

output states

RL = 27Ω or 50Ω (Figure 2.)0.2

VOC

Driver common-mode

output voltage

RL = 27Ω or 50Ω (Figure 2.)3

∆VOC

Change in magnitude of

driver common-mode output

voltage for complementary

output states

RL = 27Ω or 50Ω (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 = 0V or 5.25VVDE = 0V

VIN = 12V

VIN = -7V

-0.8

VTH

Receiver differential

threshold voltage

VCM = -7 to 12V

-0.2

0.2

∆VTH

Receiver input hysteresis

VCM = 0V

VOH

Receiver output high

voltage

IO = -4mAVID = 200mV

3.5

VOL

Receiver output low voltage IO = 4mAVID = -200mV

0.4

IOZR

3-State (high impedance)

output current at receiver

VO = 0.4 to 2.4V

± 1µA

RIN

Receiver input resistance

VCM = -7 to 12V

Ω

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