ST490ABDR datasheet(6/17 Pages) STMICROELECTRONICS

6 / 17 page

Electrical characteristics

ST490A

6/17

Electrical characteristics

Table 5.

Electrical characteristics

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

referred to TA=25°C)

Symbol

Parameter

Min.

Typ.

Max.

Unit

ISUPPLY

No load supply current

CIN

Input capacitance

1.8

CYZ

Driver output capacitance

1.2

COUT

Output capacitance

2.3

Table 6.

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)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VOD1

Differential drive output (no load)

VCC

VOD2

Differential drive output (with

load)

RL= 54Ω (RS-422) (Figure 1.)1.5

2.6

VOD3

Differential drive output (with

load)

RL= 100Ω (RS-422) (Figure 1.)2

∆V

Change in magnitude of driver

differential output voltage for

complementary output states

RL= 54Ω or 100Ω (Figure 1.)0

0.2

VOC

Driver common mode output

voltage

RL= 54Ω (Figure 1.)1

∆V

Change in magnitude of driver

common mode output voltage

RL= 54Ω (Figure 1.)0

0.2

IOFF

Power off output current

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

± 100

µA

IOSD

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

± 35

± 250

VIL

Input logic threshold low

0.8

VIH

Input logic threshold high

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