ADM485E_15 Datasheet, PDF (5/16 Pages) Analog Devices – Half-Duplex, RS-485/RS-422 Transceivers

ADM485E/ADM487E/ADM1487E
VCC = 5 V ± 10%, TA = TMIN to TMAX, unless otherwise noted.
Table 4. ADM487E
Parameter
DRIVER
Driver Propagation Delay Input to Output, Low to High
Symbol Min Typ Max Unit
tDPLH
250 800 2000 ns
Driver Propagation Delay Input to Output, High to Low
tDPHL
250 800 2000 ns
Output Skew to Output
tSKEW
250 20
800 ns
Rise/Fall Time
tDR, tDF
250
2000 ns
Enable Time to High Level
tDZH
250
2000 ns
Enable Time to Low Level
tDZL
2000 ns
Disable Time from Low Level
tDLZ
300
3000 ns
Disable Time from High Level
tDHZ
300
3000 ns
RECEIVER
Receiver Propagation Delay Input to Output, Low to High tRPLH
250
2000 ns
Receiver Propagation Delay Input to Output, High to Low tRPHL
250
2000 ns
|tPLH − tPHL| Differential Receiver Skew
tSKEW
100
ns
Enable Time to Low Level
tRZL
25
50
ns
Enable Time to High Level
tRZH
25
50
ns
Disable Time from Low Level
tRLZ
25
50
ns
Disable Time from High Level
tRHZ
25
50
ns
Maximum Data Rate
fMAX
250
kbps
Time to Shutdown¹
tSHDN
50 200 600 ns
Driver Enable from Shutdown to Output High
tDZH(SHDN)
5000
ns
Driver Enable from Shutdown to Output Low
tDZL(SHDN)
5000
ns
Receiver Enable from Shutdown to Output High
tRZH(SHDN)
5000
ns
Receiver Enable from Shutdown to Output Low
tRZL(SHDN)
5000
ns
Test Conditions/Comments
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)
CL = 100 pF, S1 closed (see Figure 21)
CL = 100 pF, S1 closed (see Figure 22)
CL = 15 pF, S1 closed (see Figure 22)
CL = 15 pF, S1 closed (see Figure 21)
See Figure 23 and Figure 24
See Figure 23 and Figure 24
See Figure 23 and Figure 24
CL = 15 pF, S2 closed (see Figure 25)
CL = 15 pF, S1 closed (see Figure 25)
CL = 15 pF, S2 closed (see Figure 25)
tPLH, tPHL < 50% of data period
CL = 100 pF, S1 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 RE high and 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. B | Page 5 of 16