ST485A datasheet(7/19 Pages) STMICROELECTRONICS

Numer części	ST485A

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

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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ST485A

Electrical characteristics

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4.3

Receiver

(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)

4.4

Driver switching

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

referred to TA = 25°C, VCC = 5V) (See Note: 1, 3)

Table 8.

Receiver electrical characteristics

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

VTH

Receiver Differential Threshold

Voltage

VCM = -7V to 12V

-0.2

0.2

V

∆V

TH

Receiver Input Hysteresis

VCM = 0V

70

mV

VOH

Receiver Output High Voltage

IOUT = -4mA, VID = 200mV

3.5

4.7

V

VOL

Receiver Output Low Voltage

IOUT = 4mA, VID = -200mV

0.2

0.4

V

IOZR

3-State (High Impedance) Output

Current at Receiver

VO = 0.4V to 2.4V

± 1

µA

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

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

DR

Maximum data rate

Jitter < 5%

30

50

Mbps

tPLH

tPHL

Propagation delay input to output

RL= 54Ω, CL1=CL2=50pF, (Figure 1)

18

30

ns

tSKEW

Differential output delay skew

RL= 54Ω, CL1=CL2=50pF, (Figure 1)

0.5

2

ns

tTLH

tTHL

Rise or fall differential time

RL= 54Ω, CL1=CL2=50pF, (Figure 1)

8

12

ns

tPZL

Output enable time

CL= 50pF, S1 Closed

30

ns

tPZH

Output enable time

CL= 50pF, S2 Closed

30

ns

tPHZ

Output disable time

CL= 15pF, S2 Closed

30

ns

tPLZ

Output disable time

CL= 15pF, S1 Closed

30

ns

tSK(EN)

Synchronous driver operation a-b at

enable

2ns

tSK(DS)

Synchronous driver operation A-B

at disable

46

ns

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