ST485ER Просмотр технического описания (PDF) - STMicroelectronics

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производитель

ST485ER

±15KV ESD protected, Low power RS-485/RS-422 transceiver

STMicroelectronics 

Electrical characteristics

4

Electrical characteristics

ST485ER

4.1

6/19

Table 5. ESD Performance: transmitter outputs, receiver inputs

Symbol

Parameter

Test conditions

Min. Typ. Max. Unit

ESD ESD Protection voltage

Human body model

±15

KV

ESD ESD Protection voltage

IEC-1000-4-2

±8

KV

DC Electrical characteristics

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

to TA = 25°C)

Table 6. DC Electrical characteristics

Symbol

Parameter

Test conditions (1)

Min. Typ. Max. Unit

VOD1

Differential driver output (no

load)

5

V

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.)

5

V

5

V

0.2 V

VOC

Driver common-mode

output voltage

RL = 27Ω or 50Ω (Figure 2.)

3

V

∆VOC

Change in magnitude of

driver common-mode output

voltage for complementary

output states

RL = 27Ω or 50Ω (Figure 2.)

0.2 V

VIH Input high voltage

VIL Input low voltage

IIN1 Input current

IIN2 Input current (A, B)

VTH

Receiver differential

threshold voltage

RE, DE, DI

2.0

RE, DE, DI

RE, DE, DI

VCM = 0V or 5.25VVDE = 0V

VIN = 12V

VIN = -7V

VCM = -7 to 12V

-0.2

V

0.8 V

± 2 µA

1 mA

-0.8 mA

0.2 V

∆VTH Receiver input hysteresis VCM = 0V

70

mV

VOH

Receiver output high

voltage

IO = -4mAVID = 200mV

3.5

V

VOL

IOZR

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

3-State (high impedance)

output current at receiver

VO = 0.4 to 2.4V

0.4 V

± 1 µA

RIN Receiver input resistance VCM = -7 to 12V

24

KΩ

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