ST485A 데이터 시트보기 (PDF) - STMicroelectronics

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ST485A

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

STMicroelectronics 

Electrical characteristics

ST485A

4.5

Receiver switching

Table 10.

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) (See Note: 1, 3)

Driver switching characteristics

Parameter

Test conditions

Min Typ Max Unit

tPLH

tPHL

tRPDS

tPZL

tPZH

tPHZ

tPLZ

Propagation Delay

CL = 15pF

|tPLH - tPHL| Propagation delay skew CL = 15pF

Output enable time

CRL = 15pF, S1 Closed

Output enable time

CRL = 15pF, S2 Closed

Output disable time

CRL = 15pF, S2 Closed

Output disable time

CRL = 15pF, S1 Closed

18 30 ns

0.5 2

ns

7

12 ns

7

12 ns

7

12 ns

7

12 ns

Note: 1 All currents into device pins are positive; all currents out of device pins are negative; all

voltages are referenced to device ground unless specified.

2 Applies to peak current. See typical Operating Characteristics.

3 tr=tf ≤ 6ms.

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