ST485ABN Просмотр технического описания (PDF) - STMicroelectronics

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ST485ABN

Very high speed low power RS-485/RS-422 transceiver

STMicroelectronics 

Electrical characteristics

4

Electrical characteristics

ST485A

Table 5.

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

referred to TA = 25°C, VCC = 5V) (Note: 1)

DC Electrical characteristics

Symbol

Parameter

Test conditions

Min Typ Max Unit

ISUPPLY VCC Power supply current

CI/O Input/output capacitance

CAB Driver output capacity

No load, VRE=0V or VCC

VDE = VCC

VDE = 0V

2.3 5 mA

2.6 5 mA

10

pF

10

pF

4.1

Logic input

Table 6.

Symbol

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

referred to TA = 25°C, VCC = 5V) (Note: 1)

Logic input electrical characteristics

Parameter

Test conditions

Min Typ Max Unit

VIL Input logic threshold low

DE, DI, RE

VIH Input logic threshold high DE, DI, RE

2

IIN1 Logic input current

DE, DI, RE

IIN2 Input current (A, B)

VIN=12V

VDE=0V, VCC= 0 or 5.25V

VIN=-7V

0.8 V

V

± 2.0 µA

1 mA

-0.8 mA

4.2

Transmitter

Table 7.

Symbol

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

referred to TA = 25°C, VCC = 5V) (Note: 1)

Transmitter electrical characteristics

Parameter

Test conditions

Min Typ Max Unit

VOD1 Differential driver output (No load)

VOD2 Differential driver output (with load) RL= 54Ω (RS-422) VCM= -7V to 12V 1.5

∆VOD

Change in magnitude of driver

differential output voltage for

complementary output states

(Note: 1)

RL= 27Ω or 50Ω

VOC

Driver common mode output

voltage

RL= 27Ω or 50Ω

1

∆VOC

Change in magnitude of driver

common mode output voltage

(Note: 1)

RL= 54Ω or 100Ω

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

5

V

2.7 5

V

0 0.2 V

3

V

0 0.2 V

± 250 mA

6/19

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