ST485BD 데이터 시트보기 (PDF) - STMicroelectronics

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ST485BD

Low power RS-485 / RS-422 transceiver

STMicroelectronics 

Electrical characteristics

4

Electrical characteristics

ST485

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

to TA = 25°C)

Table 5. DC Electrical characteristics

Symbol

Parameter

Test conditions (1)

VOD1

VOD2

∆VOD

VOC

∆VOC

VIH

VIL

IIN1

IIN2

VTH

∆VTH

VOH

VOL

IOZR

RIN

Differential Driver Output

(No Load)

Differential Driver Output RL = 27Ω (RS-485) (Figure 2.)

(With Load)

RL = 50Ω (RS-422) (Figure 2.)

Change in Magnitude of

Driver Differential Output

Voltage for

Complementary Output

States

RL = 27Ω or 50Ω (Figure 2.)

Driver Common-Mode

Output Voltage

RL = 27Ω or 50Ω (Figure 2.)

Change in Magnitude of

Driver Common-Mode

Output Voltage for

Complementary Output

States

RL = 27Ω or 50Ω (Figure 2.)

Input High Voltage

RE, DE, DI

Input Low Voltage

RE, DE, DI

Input Current

RE, DE, DI

Input Current (A, B)

Receiver Differential

Threshold Voltage

VCM = 0V or 5.25VVDE = 0V

VIN = 12V

VIN = -7V

VCM = -7 to 12V

Receiver Input

Hysteresis

VCM = 0V

Receiver Output High

Voltage

IO = -4mAVID = 200mV

Receiver Output Low

Voltage

IO = 4mAVID = -200mV

3-State (High

Impedance) Output

Current at Receiver

VO = 0.4 to 2.4V

Receiver Input

Resistance

VCM = -7 to 12V

Value

-40 to 85 °C

-55 to 125 °C Unit

Min Typ Max Min Max

5

5

V

1.5

5

5

1.4

5

5

V

V

0.2

0.2 V

3

3

V

0.2

0.2 V

2.0

2.0

V

0.8

0.8 V

±2

± 2 µA

1

1 mA

-0.8

-0.8 mA

-0.2

0.2 -0.2 0.2 V

70

mV

3.5

3.4

V

0.4

0.55 V

±1

± 1 µA

24

24

KΩ

6/19

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