ST490ACN Просмотр технического описания (PDF) - STMicroelectronics

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Компоненты Описание

производитель

ST490ACN

Low power high speed RS-485/RS-422 transceiver

STMicroelectronics 

Electrical characteristics

4

Electrical characteristics

ST490A

Table 5.

Symbol

Electrical characteristics

(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are

referred to TA=25°C)

Parameter

Min. Typ. Max. Unit

ISUPPLY

CIN

CYZ

COUT

No load supply current

Input capacitance

Driver output capacitance

Output capacitance

2

5

mA

1.8

pF

1.2

pF

2.3

pF

Table 6.

Symbol

Transmitter electrical characteristics

(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are

referred to TA=25°C)

Parameter

Test conditions

Min. Typ. Max. Unit

VOD1 Differential drive output (no load)

VCC

V

VOD2

Differential drive output (with

load)

RL= 54Ω (RS-422) (Figure 1.)

1.5

2.6

5

V

VOD3

Differential drive output (with

load)

RL= 100Ω (RS-422) (Figure 1.) 2

3

V

∆VOD

Change in magnitude of driver

differential output voltage for

complementary output states

RL= 54Ω or 100Ω (Figure 1.)

0

0.2

V

VOC

Driver common mode output

voltage

RL= 54Ω (Figure 1.)

1

3

V

∆VOC

Change in magnitude of driver

common mode output voltage

RL= 54Ω (Figure 1.)

0

0.2

V

IOFF Power off output current

VCC = 0V, VO=-7V to 12V

IOSD Driver short circuit output current VO=-7V to 12V

± 35

VIL

Input logic threshold low

VIH

Input logic threshold high

2

± 100 µA

± 250 mA

0.8

V

V

6/17

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