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PDF BL3085B Data sheet ( Hoja de datos )
| Número de pieza | BL3085B | |
| Descripción | RS-485 Transceivers | |
| Fabricantes | BELLING | |
| Logotipo |  |
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BL3085B
High ESD-Protected, Fail-Safe, Slew-Rate-Limited
RS-485 Transceivers
General Description
The BL3085B is a half-duplex RS-485 transceiver with ±18kV IEC 61000-4-2 contact discharge
protection. The BL3085B contains one driver and one receiver. The device features fail-safe circuitry,
which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means
that the receiver output will be logic high even if all transmitters on a terminated bus are disabled. The
BL3085B features reduced slew-rate driver that minimizes EMI and reduces reflections caused by
improperly terminated cables, allowing error-free data transmission up to 250kbps. The BL3085B has a
1/8 unit load receiver input impedance that allows up to 256 transceivers on the bus.
Configuration
Functional Block of BL3085B
Applications
RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial Control Local Area Networks
Energy Meter Networks
Lighting Systems
Page- 1 -
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1 page  
BL3085B
Driver Output Skew
|TDPLH – TDPHL|
T DSKEW
Figure 3 and 5，RDIFF=54Ω
CL1=CL2=100pF
100 ns
Driver Rise or Fall Time
TDR, TDF
Figure 3 and 5，RDIFF=54Ω
CL1=CL2=100pF
150 500
ns
Maximum Data Rate
Driver Enable to Output
High
Driver Enable to Output
Low
F MAX
T DZH
T DZL
Figure 4 and 6，CL=100pF S2
Closed
Figure 4 and 6，CL=100pF S1
Closed
250
kbps
200 ns
200 ns
Driver Disable
from Low
Driver Disable
from High
Time
Time
T DLZ
T DHZ
Figure 4 and 6，CL=15pF S1
Closed
Figure 4 and 6，CL=15pF S2
Closed
300 ns
300 ns
Receiver Input to
Output
T RPLH
T RPHL
Figure 7 and 9，
; rise and fall time of
VID≦15ns
450 800
ns
|TRPLH
–
Differential
Skew
TRPHL|
Receiver
T RSKD
Figure 7 and 9，
; rise and fall time of
VID≦15ns
30
ns
Receiver Enable to
Output Low
T RZL
Figure 2 and 8，CL=100pF S1
Closed
20 50
ns
Receiver Enable to
Output High
T RZH
Figure 2 and 8，CL=100pF S2
Closed
20 50
ns
Receiver Disable Time
from Low
T RLZ
Figure 2 and 8，CL=100pF S1
Closed
80 150
ns
Receiver Disable Time
from High
T RHZ
Figure 2 and 8，CL=100pF S2
Closed
80 150
ns
Time to Shutdown
Driver Enable from
Shutdown to Output
High
Driver Enable from
Shutdown to Output
Low
Receiver Enable from
Shutdown to Output
High
Receiver Enable from
Shutdown to Output
Low
T SHDN
T DZH(SHDN)
T DZL(SHDN)
T RZH(SHDN)
T RZL(SHDN)
Figure 4 and 6，CL=15pF S2
Closed
Figure 4 and 6，CL=15pF S1
Closed
Figure 2 and 8，CL=100pF S2
Closed
Figure 2 and 8，CL=100pF S1
Closed
50 300
200
ns
ns
200 ns
300 ns
300 ns
Page5
www.belling.com.cn
V1.2
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BL3085B.PDF ] | |
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