ST1480A Просмотр технического описания (PDF) - STMicroelectronics

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ST1480A

3.3V POWERED, 15KV ESD PROTECTED, TRASMIT AT UP TO 12MBPS TRUE RS-485/RS-422 TRANSCEIVER

STMicroelectronics 

ST1480A

TRANSMITTER 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

∆VOD

VOC

∆VOC

IOSD

Differential Drive Output

Change in magnitude of

Driver Differential Output

Voltage for Complementary

Output States (Note1)

Driver Common Mode

Output Voltage

Change in magnitude of

Driver Common Mode

Output Voltage (Note1)

Driver Short Circuit Output

Current

RL= 100Ω (RS-422) (Figure 1)

RL= 54Ω (RS-485) (Figure 1)

RL= 60Ω (RS-485) (Figure 2)

RL= 54Ω or 100Ω (Figure 1)

RL= 54Ω or 100Ω (Figure 1)

RL= 54Ω or 100Ω (Figure 1)

2

V

1.5

V

1.5

V

0.2

V

3

V

0.2

V

± 250 mA

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

VTH Receiver Differential

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

-0.2

Threshold Voltage

∆VTH Receiver Input Hysteresis VCM = 0V

VOH Receiver Output High

Voltage

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

2

VOL Receiver Output Low

Voltage

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

IOZR 3-State (High Impedance) VCC = 3.6V VO = 0V to VCC

Output Current at Receiver

RRIN Receiver Input Resistance VCM = -7V to 12V

24

IOSR Receiver Short-Circuit

VRO = 0V to VCC

7

Current

-0.015 V

30

V

V

0.4

V

±1

µA

KΩ

60

mA

4/16

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