ST485EC 데이터 시트보기 (PDF) - STMicroelectronics

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ST485EC

±15 kV ESD protected, low power RS-485/RS-422 transceiver

STMicroelectronics 

Electrical characteristics

4

Electrical characteristics

ST485EB - ST485EC - ST485EX

Table 6. ESD performance: transmitter outputs, receiver inputs

Symbol

Parameter

Test conditions

Min. Typ. Max. Unit

ESD ESD protection voltage

Human body model

±15

kV

ESD ESD protection voltage

IEC-1000-4-2

±8

kV

Table 7.

Symbol

DC electrical characteristics (VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise

specified. Typical values are referred to TA = 25 °C)

Parameter

Test conditions (1)

Min. Typ. Max. Unit

VOD1

Differential driver output (no

load)

VOD2

Differential driver output

(with load)

RL = 27 Ω (RS-485) (Figure 2)

RL = 50 Ω (RS-422) (Figure 2.)

1.5

ΔVOD

Change in magnitude of

driver differential output

voltage for complementary

output states

RL = 27 Ω or 50 Ω (Figure 2)

VOC

Driver common-mode output

voltage

RL = 27 Ω or 50 Ω (Figure 2)

5

V

5

V

5

V

0.2

V

3

V

ΔVOC

VIH

VIL

IIN1

IIN2

VTH

ΔVTH

VOH

VOL

IOZR

RIN

ICC

IOSD1

Change in magnitude of

driver common-mode output

voltage for complementary

output states

RL = 27 Ω or 50 Ω (Figure 2)

Input high voltage

RE, DE, DI

Input low voltage

RE, DE, DI

Input current

RE, DE, DI

Input current (A, B)

Receiver differential

threshold voltage

VCM = 0 V or 5.25 V, VDE = 0 V

VIN = 12 V

VIN = -7 V

VCM = -7 to 12 V

Receiver input hysteresis VCM = 0 V

Receiver output high voltage IO = -4 mA, VID = 200 mV

Receiver output low voltage IO = 4 mA, VID = -200 mV

3-State (high impedance)

output current at receiver

VO = 0.4 to 2.4 V

Receiver input resistance

No load supply current (2)

Driver short-circuit current,

VO=High

VCM = -7 to 12 V

VRE = 0V or VCC

VDE = VCC

VDE = 0 V

VO = -7 to 12 V (3)

0.2

V

2.0

V

0.8

V

± 2 µA

1

mA

-0.8 mA

-0.2

0.2

V

70

mV

3.5

V

0.4

V

± 1 µA

96

kΩ

400 900 µA

300 500 µA

35

250 mA

6/18

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