HG3085E
General Description
The HG3085E +5V, half-duplex, ±
15kV ESD-
protected
RS-485/RS-422-compatible
transceivers feature one driver and one receiver.
The HG3085E include a hot-swap capability to
eliminate false transitions on the bus during
power-up or live insertion.
TheHG3085E features reduced slew-rate drivers
that minimize EMI and reduce reflections caused
by improperly terminated cables, allowing error-
free transmission up to 500kbps.
The HG3085E feature a 1/8-unit load receiver
input impedance, allowing up to 256 transceivers
on the bus. These devices are intended for half-
duplex communications. All driver outputs are
protected to ±
15kV ESD using the Human Body
Model.
TheHG3085 is available in an 8-pin SO package.
C
The devices operate over the extended -40° to
+85° temperature range.
C
Features
+5V Operation
Hot-Swappable for Telecom Applications
Enhanced Slew-Rate Limiting Facilitates
Error-
Free Data Transmission
Extended ESD Protection for RS-485 I/O
Pins
±15kV
Human Body Model
1/8Unit
Load
，
Allowing Up to
256Transceivers on the Bus
8 Pin-SOP/DIP Package
Applications
Isolated RS-485 Interfaces
Utility Meters
Industrial Controls
Industrial Motor Drives
Automated HVAC Systems
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
Supply Voltage VCC...............................................................+6V
DE, RE, DI..............................................................-0.3V to +6
A, B........................................................................... -8V to +13V
Short-Circuit Duration (RO, A, B) to GND ..................Continuous
Continuous Power Dissipation (TA = +70°
C)
8-Pin SO (derate 5.9mW/° above +70°
C
C)..................471mW
Operating Temperature Range ...........................-40° to +85°
C
C
Junction Temperature......................................................+150°
C
Storage Temperature Range .............................-65° to +150°
C
C
Lead Temperature (soldering 10s) ..................................+300°
C
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.
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HG3085E
DC ELECTRICAL CHARACTERICS
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°
C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER
Differential Driver Output (no load)
V
OD1
Figure1
Figure1,R = 50Ω (RS-
422)
Figure1,R = 27Ω (RS-
485)
Figure1,R =50Ωor R=
27Ω
Figure1,R=50Ωor R =
27Ω
Figure1,R=50Ωor R =
27Ω
DE, DI, RE,
DE, DI, RE,
WS3085
2.0
V
1.5
0.2
V
5
V
Differential Driver Output
V
OD2
Change in Magnitude of Differential
Output Voltage (Note 2)
Driver Common-Mode Output
Voltage
Change In Magnitude of
Common-Mode Voltage (Note 2)
Input High Voltage
Input Low Voltage
DI Input Hysteresis
∆V
OD
V
OC
3
V
∆V
OC
V
IH1
V
IL1
V
HYS
I
IN1
I
IN4
0.2
2.0
0.8
100
±
2
V
V
V
mV
µA
µA
Input Current
Input Current (A and B)
Driver Short-Circuit Output
Current (Note 3)
RECEIVER
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State Output Current at
Receiver
Receiver Input Resistance
Receiver Output Short-Circuit
Current
SUPPLY CURRENT
Supply Current
DE, DI, RE
DE = GND,
VCC=GND or 5.25V
VIN=12V
VIN = -7V
125
-75
-250
V
OD1
-7V
≤
V
OUT
≤
V
CC
mV
V
TH
∆V
TH
V
OH
V
OL
I
OZR
R
IN
I
OSR
-7V
≤
V
CM
≤
+12V
-200
-125 -50
25
mV
mV
V
V
µA
kΩ
I
O
= 4mA, V
ID
= -200mV;
I
O
= -4mA, V
ID
= -50mV
0.4V
≤
V
O
≤
2.4V
-7V
≤
V
CM
≤
+12V
0V
≤
V
RO
≤
V
CC
±7
Vcc-1.5
0.4
±
1
96
±
95
mA
I
CC
No load,
RE =DI=GND or VCC
DE = VCC
DE =
GND
530
500
900
600
µA
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HG3085E
SWITCHING CHARACTERISTICS
(VCC = +5V ±
5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +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
SYMBOL
t
DPLH
t
DPHL
t
DSKEW
t
DR,
t
DF
f
MAX
t
DZH
CONDITIONS
Figures3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
MIN TYP MAX
250 720 1000
250 720 1000
-3
200
±
100
530
500
750
UNITS
ns
ns
ns
kbps
ns
ns
ns
ns
Figures4 and 6, C
L
=
100pF, S2 closed
2500
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
DZL
t
DLZ
t
DHZ
t
RPLH
,
t
RPHL
Figures4 and 6,C
L
=
100pF, S1 closed
Figures 4 and 6, C
L
=
15pF, S1 closed
Figures 4 and 6, C
L
=
15pF, S2 closed
Figures 7 and 9;
|
V
ID
|
≥
2.0V;rise and fall time of
V
ID
≤
15ns
Figures 7 and 9;
|
V
ID
|
≥
2.0V;rise and fall time of
V
ID
≤
15ns
Figures 2 and 8, C
L
=
100pF, S1 closed
Figures 2 and 8, C
L
=
100pF, S2 closed
Figures 2 and 8 , C
L
=
100pF, S1 closed
Figures 2 and 8, C
L
=
100pF, S2 closed
(Note 4)
Figures 4 and 6, C
L
=
15pF, S2 closed
Figures 4 and 6, C
L
=
15pF, S1 closed
Figures 2 and 8, C
L
=
100pF, S2 closed
2500
100
100
127
200
Receiver Input to Output
ns
|
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 from
Shutdown to Output High
t
RSKD
t
RZL
t
RZH
t
RLZ
t
RHZ
t
SHDN
t
DZH(SHD
N)
3
20
20
20
20
50
200
4500
±
30
50
50
50
50
600
ns
ns
ns
ns
ns
ns
ns
t
DZL(SHDN
)
4500
ns
t
RZH(SHD
N)
3500
ns
ns
Receiver Enable from
Shutdown to Output Low
t
RZL(SHDN
)
Figures 2 and 8, C
L
=
100pF, S1 closed
3500
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
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HG3085E
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HG3085E
Pin Description
PIN
1
2
NAME
RO
RE
FUNCTION
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.
RE is a hot-swap input (see the
Hot-Swap Capability
section for more details).
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.
DE is a hot-swap input (see the
Hot-Swap Capability
section for more details).
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, V
CC
= +5V ±5%. Bypass V
CC
to GND with a 0.1µF capacitor.
3
4
5
6
7
8
DE
DI
GND
A
B
Vcc
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