ST3485EBDR datasheet(4/16 Pages) STMICROELECTRONICS

4 / 16 page

ST3485E

4/16

TRANSMITTER ELECTRICAL CHARACTERISTICS

VCC =3V to 3.6V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta =25°C)

RECEIVER ELECTRICAL CHARACTERISTICS

VCC =3V to 3.6V, TA = -40 to 85°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= 100Ω (RS-422) (Figure 1)

RL=54Ω (RS-485) (Figure 1)

1.5

RL=60Ω (RS-485) (Figure 2)

1.5

∆V

Change in magnitude of

Driver Differential Output

Voltage for Complementary

Output States (Note1)

RL=54Ω or 100Ω (Figure 1)

0.2

VOC

Driver Common Mode

Output Voltage

RL=54Ω or 100Ω (Figure 1)

∆V

Change in magnitude of

Driver Common Mode

Output Voltage (Note1)

RL=54Ω or 100Ω (Figure 1)

0.2

IOSD

Driver Short Circuit Output

Current

± 250

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VTH

Receiver Differential

Threshold Voltage

VCM = -7V to 12V, DE = 0

-0.2

-0.015

∆V

Receiver Input Hysteresis

VCM =0V

VOH

Receiver Output High

Voltage

IOUT = -4mA, VID = 200mV, (Figures 8,9)

VOL

Receiver Output Low

Voltage

IOUT = 4mA, VID = -200mV, (Figure 3)

0.4

IOZR

3-State (High Impedance)

Output Current at Receiver

VCC = 3.6V VO =0V toVCC

± 1

µA

RRIN

Receiver Input Resistance

VCM = -7V to 12V

Ω

IOSR

Receiver Short-Circuit

Current

VRO =0V toVCC

760

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