BL3085E
General Description
TheBL3085E is a +/- 15kV electrostatic discharge (ESD) protected, high-speed transceiver for
RS-485 communication that contain 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 BL3085E features reduced slew-rate driver that minimizes EMI
and reduces reflections caused by improperly terminated cables, allowing error-free data
transmission up to 500kbps. All transmitter outputs and receiver inputs are protected to +/- 15kV
using the Human Body Model. The transceiver typically draws 500 micron ampere of supply
current when unloaded, or when fully loaded with the driver disabled. All devices have a
1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The BL3085E
is intended for half-duplex communications.
Applications
RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial Control Local Area Networks
Energy Meter Networks
Power Inverters
Building Automation Networks
Telecommunications Equipment
I/O ESD
protection
Human Body Model:
±15kV
IEC 61000-4-2：
Contact discharge:
±15kV
Air discharge:
±20kV
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V1.0
BL3085E
PIN Configuration
BL3085E
Pin figure
BL3085E logic figure
Ordering Information
PART
BL3085E
TEMP RANGE
-40℃½+85℃
PIN PACKAGE
SOP8
Pin Description
BL3085E PIN
NAME
FUNCTION
1
2
RO
RE
Receiver Output. When RE is low and if A - B
≧-50mV,
RO will be high; if A
- B
≦-200mV,
RO will be low.
Receiver Output Enable. Drive RE low to enable RO; RO is high impedance
when RE is high. Drive RE high and DE low to enter low-power
shutdown mode.
Driver Output Enable. Drive DE high to enable driver outputs. These outputs
are high impedance when DE is low. Drive RE high and DE low to
enter low-power shutdown mode.
Driver Input. With DE high, a low on DI forces non-inverting output low and
inverting output high. Similarly, a high on DI forces non-inverting output
high and inverting output low.
Ground
Non-inverting Receiver Input and Non-inverting Driver Output
Inverting Receiver Input and Inverting Driver Output
Positive Supply 4.75V
≦VCC ≦5.25V
3
DE
4
5
6
7
8
DI
GND
A
B
VCC
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V1.0
BL3085E
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage (VCC)
Control Input Voltage (RE, DE)
Driver Input Voltage (DI)
Driver Output Voltage (A, B)
Receiver Input Voltage (A, B)
Receiver Output Voltage (RO)
Continuous Power Dissipation
Operating Temperature Ranges
Storage Temperature Range
Lead Temperature (soldering, 10s)
SYMBOL
V
CC
/RE, DE
DI
A, B
A, B
RO
Pd
BL3085E
NUM
+7
-0.3~V
CC
+0.3
-0.3~V
CC
+0.3
±
13
±
13
-0.3~V
CC
+0.3
471
-40½+85
-65½+150
300
UNITS
V
V
V
V
V
V
mW
℃
℃
℃
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ± 5%, TA = T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°
C.) (Note
1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
SYMBOL
UNITS
DRIVER
Differential Driver
VOD1
Figure 1
5
V
Output (No Load)
Differential Driver
VOD2
Figure 1, R = 27
1.5
V
Output
Change-in-Magnitude
of Differential Output
0.2
V
Figure 1, R = 27
VOD
Voltage (Note 2)
Driver Common Mode
Figure 1, R = 27
VOC
3
V
Output Voltage
Change-in-Magnitude
of Common-Mode
VOC
0.2
V
Figure 1, R = 27
Voltage (Note 2)
of
Input High Voltage
DE, DI, RE
VIH1
2.0
V
Input Low Voltage
VIL1
DE, DI, RE
0.8
V
DI Input Hysteresis
VHYS
BL3085E
100
mV
DE =
GND,
VIN = 12V
125
VCC =
Input Current (A and B)
µ
A
IIN1
GND
Or
VIN = -7V
-75
5.25V
-7V
≦VOUT ≦VCC
-250
Driver Short-Circuit
Output Current
(Note 3)
I
OSD
0V
≦VOUT ≦12V
0V
≦VOUT≦VCC
RECEIVER
VTH
VTH
Input
Output
VOH
Output
VOL
IOZR
-7V
≦VCM ≦12V
±25
250
mA
Receiver
Differential
Threshold Voltage
Receiver Input
Hysteresis
Receiver Output
High Voltage
Receiver Output
Low Voltage
Three-State Output
Current at Receiver
-200
-120
30
-50
mV
mV
V
IO = -4mA, VID = -50mV
IO = 4mA, VID = -200mV
0.4V
≦VO≦2.4V
VCC-1.5
0.4
±1
V
µ
A
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V1.0
BL3085E
Receiver
Input
Resistance
Receiver Output
Short
Circuit
Current
Input
RIN
IOSR
-7V≦VCM
≦12V
0V
≦VRO ≦VCC
96
±7
±95
kΩ
mA
Supply Current
Supply Current in
Shutdown Mode
ESD Protection for A,
B
SUPPLY CURRENT
No load,
DE = VCC
RE = DI=
ICC
GND or
DE = GND
VCC
ISHDN
DE = GND, VRE = VCC
Human Body Model
110
180
0.001
±15
900
600
10
µ
A
µ
A
µ
A
kV
SWITCHING CHARACTERISTICS—BL3085E
(V
CC
= +5V ± 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°
C.)
PARAMETER
Driver Input to
Output
Driver Output Skew
|
t
DPLH –
t
DPHL |
Driver Rise or Fall
Time
Maximum Data Rate
Driver Enable to
Output High
Driver Enable to
Output Low
Driver Disable Time
from Low
Driver Disable Time
from High
Receiver Input to
Output
|
t
RPLH –
t
RPHL|
Differential Receiver
Skew
Receiver Enable to
Output Low
Receiver Enable to
Output High
Receiver Disable
Time from Low
Receiver Disable
Time from High
Time to Shutdown
Driver Enable from
Shutdown-to-Output
High
Driver Enable from
Shutdown-to-Output
Low
Receiver Enable
SYMBOL
CONDITIONS
Figure 3, RDIFF =54,
CL1 = CL2 =100pF
Figure 3, RDIFF =54
CL1 = CL2 =100pF
Figure 3, RDIFF =54
,CL1 = CL2 =100pF
Figure 4, CL =100pF,
S2 closed
Figure 4, CL =100pF,
S1 closed
Figure 4, CL = 15pF,
S1 closed
Figure 4, CL = 15pF,
S2 closed
Figure 5, | VID |≧2.0V
rise and fall time of
VID≦15ns
Figure 5, | VID |≧2.0V
rise and fall time of
VID≦15ns
Figure 2, CL =100pF,
S1 closed
Figure 2, CL =100pF,
S2 closed
Figure 2, CL =100pF,
S1 closed
127
200
MIN
250
250
TYP
720
720
-3
530
MAX
900
900
±
100
750
500
2500
2500
100
100
UNITS
t
DPLH
t
DPHL
t
DSKEW
t
DR,
t
DF
f
MAX
t
DZH
t
DZL
t
DLZ
t
DHZ
t
RPLH,
t
RPHL
ns
ns
ns
Kbps
ns
ns
ns
ns
ns
200
t
RSKD
t
RZL
t
RHZ
t
RLZ
t
RHZ
t
SHDN
t
DZH(SHDN)
3
±30
ns
ns
ns
ns
ns
ns
ns
20
20
50
50
20
50
Figure 2, CL =100pF,
S2 closed
(Note 4)
Figure 4, CL = 15pF,
S2 closed
Figure 4, CL = 15pF,
S1 closed
Figure 2, CL =100pF,
50
20
200
50
600
4500
t
DZL(SHDN)
t
RZH(SHDN)
4500
ns
ns
3500
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V1.0
BL3085E
from
Shutdown-to-Output
High
Receiver Enable
from
Shutdown-to-Output
Low
Note 1:
S2 closed
t
RZL(SHDN)
Figure 2, CL =100pF,
3500
S1 closed
ns
All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground
unless otherwise noted.
Note 2:
ΔV
OD
and
ΔV
OC
are the changes in V
OD
and V
OC
, respectively, when the DI input changes state.
Note 3:
Maximum current level applies to peak current just prior to fold-back current limiting; minimum current level applies during
current limiting.
Note 4:
The device is put into shutdown by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the
device is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the device is guaranteed to
have entered shutdown.
Typical Operating Characteristics
Function Tables
Page- 5 -
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V1.0
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