ST3485EB Просмотр технического описания (PDF) - STMicroelectronics

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производитель

ST3485EB

3.3 V powered, 15 kV ESD protected, up to 12 Mbps RS-485/RS-422 transceiver

STMicroelectronics 

Electrical characteristics

4

Electrical characteristics

ST3485EB - ST3485EC

Table 7.

Symbol

Electrical characteristics

VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred

to TA = 25 °C)

Parameter

Test conditions

Min. Typ. Max. Unit

ISUPPLY

VCC Power supply current

DE=VCC,

RE=0V or VCC

No Load, DI=0V or VCC

DE=0V,

RE=0V

ISHDN Shutdown supply current DE=0V, RE=VCC, DI=0V or VCC

1.3 2.2 mA

1.2 1.9 mA

0.002 1

µA

Table 8.

Symbol

Logic input electrical characteristics

VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred

to TA = 25 °C)

Parameter

Test conditions

Min. Typ. Max. Unit

VIL Input logic threshold low DE, DI, RE

VIH Input logic threshold high DE, DI, RE

IIN1 Logic input current

DE, DI, RE

IIN2 Input current (A, B)

VIN=12V

DE=0V, VCC= 0 or 3.6V

VIN=-7V

1.3 0.8

V

2

V

± 2.0 µA

1

mA

-0.8 mA

Table 9.

Symbol

Transmitter electrical characteristics

VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred

to TA = 25°C)

Parameter

Test conditions

Min. Typ. Max. Unit

RL= 100Ω (RS-422) (Figure 1)

2

VOD Differential drive output

RL= 54Ω (RS-485) (Figure 1)

1.5

RL= 60Ω (RS-485) (Figure 2)

1.5

ΔVOD

Change in magnitude of driver

differential output voltage for

complementary output states

(Note: 1)

RL= 54Ω or 100Ω (Figure 1)

V

V

V

0.2

V

VOC

Driver common mode output

voltage

RL= 54Ω or 100Ω (Figure 1)

3

V

ΔVOC

Change in magnitude of driver

common mode output voltage RL= 54Ω or 100Ω (Figure 1)

(Note: 1)

0.2

V

IOSD

Driver short circuit output

current

± 250 mA

6/22

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