ADM485EARZ-REEL7(Rev0) 查看數據表（PDF） - Analog Devices

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ADM485EARZ-REEL7
(Rev.:Rev0)

5 V, ±15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers

Analog Devices 

ADM485E/ADM487E/ADM1487E

VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise noted.

Table 4. ADM487E

Parameter

DRIVER

Input to Output

Output Skew to Output

Rise/Fall Time

Symbol Min

tDPLH

250

tDPHL

250

tSKEW

250

tDR, tDF 250

Enable Time to High Level

Enable Time to Low Level

Disable Time from Low Level

Disable Time from High Level

RECEIVER

Input to Output

tDZH

250

tDZL

tDLZ

300

tDHZ

300

tRPLH

250

tRPHL

250

|tPLH − tPHL| Differential Receiver Skew

tSKEW

Enable Time to Low Level

tRZL

Enable Time to High Level

tRZL

Disable Time from Low Level

tRLZ

Disable Time from High Level

tRHZ

Maximum Data Rate

fMAX

250

Time to Shutdown1

tDZH(SHDN) 50

Driver Enable from Shutdown to Output High tDZL(SHDN)

Driver Enable from Shutdown to Output Low

tRZL(SHDN)

Receiver Enable from Shutdown to Output High tRZH(SHDN)

Typ Max Unit Test Conditions/Comments

800 2000 ns

800 2000 ns

20

800 ns

2000 ns

2000 ns

2000 ns

3000 ns

3000 ns

RDIFF = 54 Ω, CL1 = CL2 = 100 pF

(see Figure 19 and Figure 20)

RDIFF = 54 Ω, CL1 = CL2 = 100 pF

(see Figure 19 and Figure 20)

RDIFF = 54 Ω, CL1 = CL2 = 100 pF

(see Figure 19 and Figure 20)

RDIFF = 54 Ω, CL1 = CL2 = 100 pF

(see Figure 19 and Figure 20)

CRL = 100 pF, S2 closed (see Figure 21)

CRL = 100 pF, S1 closed (see Figure 22)

CRL = 15 pF, S1 closed (see Figure 22)

CRL = 15 pF, S2 closed (see Figure 21)

100

25

25

25

25

200

5000

5000

5000

2000

2000

50

50

50

50

600

ns

ns

ns

ns

ns

ns

ns

kbps

ns

ns

ns

ns

RDIFF = 54 Ω, CL1 = CL2 = 100 pF

RDIFF = 54 Ω, CL1 = CL2 = 100 pF

(see Figure 19 and Figure 20)

CRL = 15 pF, S1 closed

(see Figure 23 and Figure 24)

CRL = 15 pF, S2 closed (see Figure 25)

CRL = 15 pF, S1 closed (see Figure 25)

CRL = 15 pF, S2 closed (see Figure 25)

tPLH, tPHL < 50% of data period

CL = 100 pF, S2 closed (see Figure 21)

CL = 100 pF, S1 closed (see Figure 22)

CL = 15 pF, S2 closed (see Figure 25)

CL = 15 pF, S1 closed (see Figure 25)

1 The ADM487E is put into shutdown mode by bringing the RE high and the DE low. If the inputs are in this state for less than 50 ns, the parts are guaranteed not to

enter shutdown. If the inputs are in this state for at least 600 ns, the ADM487E is guaranteed to enter shutdown.

Rev. 0 | Page 5 of 16

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