ST490ABDR datasheet(7/17 Pages) STMICROELECTRONICS

Numer części	ST490ABDR

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

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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ST490AB

Electrical characteristics

7/17

Table 8.

Receiver electrical characteristics

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

referred to TA = 25 °C)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

IIN1

Logic input current

± 2.0

μA

IIN2

Input current (A, B)

Other input=0V

VCC= 0 or 5.25V

VIN=12V

0.5

1

mA

VIN=-7V

-0.35

-0.8

mA

VTH

Receiver differential threshold

voltage

VCM = -7V to 12V

-0.2

0.2

V

ΔVTH

Receiver input hysteresis

VCM = 0V

70

mV

VOH

Receiver output high voltage

IOUT = -8mA, VID = 200mV

3.5

4.7

V

VOL

Receiver output low voltage

IOUT = 8mA, VID = -200mV

0.2

0.4

V

RRIN

Receiver input resistance

VCM = -7V to 12V

12

24

k

Ω

IOSR

Receiver short-circuit current

VO = 0V to VCC

795

mA

Table 9.

Driver switching characteristics

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

referred to TA = 25 °C)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

DR

Maximum data rate

Jitter <5%

25

50

Mbps

tPLH

tPHL

Propagation delay input

to output

RL= 54Ω, CL1=CL2=50pF, (Figure 1)10

16

ns

tSKEW

Differential output delay

skew

RL= 54Ω, CL1=CL2=50pF, (Figure 1)1

3

ns

tTLH

tTHL

Rise or fall differential

time

RL= 54Ω, CL1=CL2=50pF, (Figure 1)8

12

ns

Table 10.

Receiver switching characteristics

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

referred to TA = 25 °C)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

tPLH

tPHL

Propagation delay input

to output

CL = 15pF, (Figure 2, Figure 4)19

30

ns

tSKD

|tPLH - tPHL| Receiver

output skew

CL = 15pF, (Figure 2, Figure 4)1

3

ns

tTLH

tTHL

Rise or fall time

CL = 15pF, (Figure 2, Figure 4)8

ns

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