ST485B 데이터 시트보기 (PDF) - STMicroelectronics

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ST485B

Low power RS-485/RS-422 transceiver

STMicroelectronics 

Electrical characteristics

ST485B - ST485C

Table 8.

Symbol

Receiver switching characteristics

VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred

to TA = 25 °C)

Value

Parameter

Test conditions (1)

-40 to 85 °C

-55 to 125°C Unit

Min. Typ. Max. Min. Max.

tPLH

tPHL

tSKD

tPZH

tPZL

tPLZ

Propagation delay input RDIFF=54Ω, CL1 = CL2 = 100pF

to output

(See Figure 4 and Figure 8)

20

Differential receiver

skew

RDIFF=54Ω, CL1 = CL2 = 100pF

(See Figure 4 and Figure 8)

Output enable time

CRL = 15pF, S1 = Closed

(See Fig. 2 and Figure 9)

Output enable time

CRL = 15pF, S2 = Closed

(See Fig. 2 and Figure 9)

Output disable time

CRL = 15pF, S1 = Closed

(See Fig. 2 and Figure 9)

130 210

13

20 50

20 50

20 50

230 ns

ns

56 ns

56 ns

56 ns

tPHZ Output disable time

CRL = 15pF, S2 = Closed

(See Fig. 2 and Figure 9)

20 50

56 ns

fMAX Maximum data rate

2.5

2.5

Mbps

1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device

ground unless specified

8/19

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