ST4485EB datasheet(6/18 Pages) STMICROELECTRONICS

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Electrical characteristics

ST4485EB

6/18

DocID025158 Rev 2

Electrical characteristics

Table 7. Electrical characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless otherwise

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

Symbol

Parameter

Test conditions

Min.

Typ.

Max. Unit

ISUPPLY VCC power supply current No load, DI = 0 V or VCC

DE = VCC,

RE = 0 V or VCC

1.3

2.2

DE = 0 V, RE = 0 V

1.2

1.9

ISHDN

Shutdown supply current

DE = 0 V, RE = VCC, DI = 0 V or VCC

0.002

µA

Table 8. Logic input electrical characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless

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

Symbol

Parameter

Test conditions

Min.

Typ. Max. Unit

VIL

Input logic threshold low

DE, DI, RE

1.3

0.8

VIH

Input logic threshold high

DE, DI, RE

IIN1

Logic input current

DE, DI, RE

2.0

µA

IIN2

Input current (A, B)

DE = 0 V, VCC = 0 or 3.6 V

VIN = 12 V

VIN = -7 V

-0.8

Table 9. Transmitter electrical characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless

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

Symbol

Parameter

Test conditions

Min.

Typ. Max. Unit

VOD

Differential drive output

RL= 100  (RS-422) (Figure 1)2

RL= 54  (RS-485) (Figure 1)1.5

RL= 60  (RS-485) (Figure 2)1.5

VOD

Change in magnitude of driver differential

output voltage for complementary output

states (1)

RL= 54  or 100 (Figure 1)0.2

VOC

Driver common mode output voltage

RL= 54  or 100 (Figure 1)3

VOC

Change in magnitude of driver common

mode output voltage(1)

RL= 54  or 100 (Figure 1)0.2

IOSD

Driver short-circuit output current

250 mA

VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state.

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