RS422 transceiver operating on 3V to 5.5V supplies with
±60V overvoltage fault protection on the interface pins
during all modes of operation, including power-down.
Improvements were made to the LTC2862 for greater ro-
bustness and signal integrity: ±40kV HBM and Level 4 IEC
ESD protection on the interface pins; increased resistance
to electrical overstress; increased receiver noise immunity;
additional receiver noise filtering on the LTC2862A-2; and
an improved failsafe function optimized for high speed in
the LTC2862A-1 and noise rejection in the LTC2862A-2.
Low EMI slew rate limited data transmission is available
in the 250kbps LTC2862A-2 option, while the LTC2862A-1
operates to 20Mbps.
Extended ±25V input common mode range and full fail-
safe operation improve data communication reliability in
electrically noisy environments and in the presence of
large ground loop voltages.
n
n
n
n
Protected from Overvoltage Line Faults to ±60V
3V to 5.5V Supply Voltage
20Mbps or Low EMI 250kbps Data Rate
±40kV HBM ESD Interface Pins, ±15kV Other Pins
Enhanced Receiver and Failsafe Noise Immunity
IEC Level 4 ESD and EFT on Interface Pins
Extended Common Mode Range: ±25V
Guaranteed Failsafe Receiver Operation
High Input Impedance Supports 224 Nodes
MP-Grade Option Available (–55°C to 125°C)
Fully Balanced Differential Receiver Thresholds for
Low Duty Cycle Distortion
Current Limited Drivers and Thermal Shutdown
Compliant with TIA/EIA-485-A
Pin Compatible with
LTC2862
and
LT
®
1785
Available in DFN and Leaded Packages
applicaTions
n
n
n
n
n
n
Supervisory Control and Data Acquisition (SCADA)
Industrial Control and Instrumentation Networks
Automotive and Transportation Electronics
Building Automation, Security Systems and HVAC
Medical Equipment
Lighting and Sound System Control
proDucT selecTion GuiDe
PART NUMBER
LTC2862A-1
LTC2862A-2
DUPLEX
HALF
HALF
ENABLES
YES
YES
MAX DATA
RATE (bps)
20M
250k
L,
LT, LTC, LTM, Linear Technology the Linear logo and µModule are registered trademarks of
Analog Devices, Inc.. All other trademarks are the property of their respective owners.
Typical applicaTion
RS485 Link With Large Ground Loop Voltage
LTC2862A
V
CC1
RO1
RE1
DE1
DI1
D
V GROUND LOOP
≤25V PEAK
R
V
CC2
R
RO2
RE2
DE2
D
DI2
LTC2862A
LTC2862A-1 Receiving 10Mbps ±200mV Differential
Signal with 1MHz ±25V Common Mode Sweep
A,B
50V/DIV
A–B
0.5V/DIV
A –B
A,B
GND1
GND2
2862A TA01a
RO
5V/DIV
RO
100ns/DIV
2862A TA01b
2862af
For more information
www.linear.com/LTC2862A
1
LTC2862A
absoluTe MaxiMuM raTinGs
(Note 1)
Supply Voltages
V
CC
............................................................. –0.3 to 6V
Logic Input Voltages (RE, DE, DI) .................. –0.3 to 6V
Interface I/O: A, B ..................................... –60V to +60V
Receiver Output (RO) ......................–0.3V to (V
CC
+0.3V)
Operating Ambient Temperature Range (Note 4)
LTC2862AC .............................................. 0°C to 70°C
LTC2862AI ...........................................–40°C to 85°C
LTC2862AH ....................................... –40°C to 125°C
LTC2862AMP..................................... –55°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiGuraTion
LTC2862A-1, LTC2862A-2
TOP VIEW
RO 1
RE
2
DE 3
DI 4
8
7
6
5
V
CC
B
A
GND
RO
RE
DE
DI
1
2
3
4
9
LTC2862A-1, LTC2862A-2
TOP VIEW
8 V
CC
7 B
6 A
5 GND
S8 PACKAGE
8-LEAD (150mil) PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 120°C/W,
θ
JC
= 39°C/W
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) CONNECT TO PCB GND
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 5.5°C/W
orDer inForMaTion
LEAD FREE FINISH
LTC2862ACS8-1#PBF
LTC2862AIS8-1#PBF
LTC2862AHS8-1#PBF
LTC2862AMPS8-1#PBF
LTC2862ACS8-2#PBF
LTC2862AIS8-2#PBF
LTC2862AHS8-2#PBF
LTC2862AMPS8-2#PBF
LTC2862ACDD-1#PBF
LTC2862AIDD-1#PBF
LTC2862AHDD-1#PBF
LTC2862ACDD-2#PBF
LTC2862AIDD-2#PBF
LTC2862AHDD-2#PBF
TAPE AND REEL
LTC2862AIS8-1#TRPBF
http://www.linear.com/product/LTC2862A#orderinfo
PART MARKING*
2862A1
2862A1
2862A1
2862A1
2862A2
2862A2
2862A2
2862A2
LGYK
LGYK
LGYK
LGYM
LGYM
LGYM
PACKAGE DESCRIPTION
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mm) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mm) Plastic SO
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
LTC2862ACS8-1#TRPBF
LTC2862AHS8-1#TRPBF
LTC2862AMPS8-1#TRPBF
LTC2862ACS8-2#TRPBF
LTC2862AIS8-2#TRPBF
LTC2862AHS8-2#TRPBF
LTC2862AMPS8-2#TRPBF
LTC2862ACDD-1#TRPBF
LTC2862AIDD-1#TRPBF
LTC2862AHDD-1#TRPBF
LTC2862ACDD-2#TRPBF
LTC2862AIDD-2#TRPBF
LTC2862AHDD-2#TRPBF
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
2
2862af
For more information
www.linear.com/LTC2862A
LTC2862A
elecTrical characTerisTics
SYMBOL PARAMETER
Supplies
V
CC
I
CCS
Primary Power Supply
Supply Current in Shutdown Mode
(C-, I-Grade)
Supply Current in Shutdown Mode
(H-, MP-Grade)
I
CCTR
I
CCR
I
CCTRS
I
CCRS
Driver
|V
OD
|
Differential Driver Output Voltage
R = ∞ (Figure 1)
R = 27Ω (Figure 1)
R = 50Ω (Figure 1)
Δ|V
OD
|
V
OC
Δ|V
OC
|
I
OSD
Receiver
I
IN
R
IN
V
CM
V
TH+
V
TH–
ΔV
TH
V
TFS
ΔV
TFS
V
OH
V
OL
I
OZR
I
OSR
C
IN
Receiver Input Current (A, B)
Receiver Input Resistance
Receiver Common Mode Input Voltage
(A + B)/2
Positive Differential Input Signal Threshold
Voltage (A – B)
–25V ≤ V
CM
≤ 25V
V
CC
= 0V or 3.3V, V
IN
= 12V (Figure 3)
V
CC
= 0V or 3.3V, V
IN
= –7V (Figure 3)
0 ≤ V
CC
≤ 5.5V, V
IN
= –25V or 25V (Figure 3)
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V unless otherwise noted. (Note 2)
CONDITIONS
MIN
3
0
0
1.1
1.0
3.5
1.3
TYP
MAX
5.5
10
40
1.6
1.4
8
1.8
UNITS
V
µA
µA
mA
mA
mA
mA
DE = 0V,
RE
= V
CC
DE = 0V,
RE
= V
CC
No Load, DE = V
CC
,
RE
= 0V
No Load, DE =
RE
= 0V
No Load, DE = V
CC
,
RE
= 0V
No Load, DE =
RE
= 0V
l
l
l
l
l
l
Supply Current with Both Driver and
Receiver Enabled (LTC2862A-1)
Supply Current with Receiver Enabled
(LTC2862A-1)
Supply Current with Both Driver and
Receiver Enabled (LTC2862A-2)
Supply Current with Receiver Enabled
(LTC2862A-2)
1.5
1.5
2
3
2
2.3
0
2
0
±150
V
CC
5
V
CC
0.2
3
0.2
±250
143
V
V
V
V
V
V
mA
µA
µA
kΩ
Change in Magnitude of Driver Differential
Output Voltage
Driver Common-Mode Output Voltage
Change in Magnitude of Driver
Common-Mode Output Voltage
Maximum Driver Short-Circuit Current
R = 27Ω or 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
–60V ≤ (A or B) ≤ 60V (Figure 2)
–100
112
–25
125
–200
–125
250
25
200
V
mV
mV
mV
Negative Differential Input Signal Threshold –25V ≤ V
CM
≤ 25V
Voltage (A – B)
Differential Input Signal Hysteresis
(V
TH+
– V
TH–
)
Differential Input Failsafe Hysteresis
(V
TFS
– V
TH–
)
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Three-State (High Impedance)
Output Current on RO
Receiver Short-Circuit Current
Input Capacitance (A and B)
V
CM
= 0V
Differential Input Failsafe Threshold Voltage –25V ≤ V
CM
≤ 25V
V
CM
= 0V
I(RO) = –3mA (Sourcing)
I(RO) = 3mA (Sinking)
RE
= High, V
CC
= 5V, RO = 0V or V
CC
RE
= Low, RO = 0V or V
CC
(Note 5)
l
–200
–75
50
–10
mV
mV
V
l
l
l
l
V
CC
–0.4V
–32
V
CC
–0.2V
0.2
0.4
5
±20
50
V
µA
mA
pF
2862af
For more information
www.linear.com/LTC2862A
3
LTC2862A
elecTrical characTerisTics
SYMBOL PARAMETER
Logic
V
TH
I
INL
Input Threshold Voltage (DE, DI,
RE)
Logic Input Current (DE, DI,
RE)
ESD Protection Level of Interface Pins
(A,B), Powered or Unpowered
3.0 ≤ V
CC
≤ 5.5V
0 ≤ V
IN
≤ V
CC
Human Body Model, A or B to GND,
V
CC
, B or A, 1μF Between V
CC
and GND
IEC 61000-4-2 ESD Level 4, Contact, 1μF
Between V
CC
and GND
ESD Protection Level of All Other Pins
(RO,
RE,
DE, DI, V
CC
, GND)
Human Body Model
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V unless otherwise noted. (Note 2)
CONDITIONS
MIN
0.33
•
V
CC
0
±40kV
±8kV
±15kV
TYP
MAX
0.67
•
V
CC
±5
UNITS
V
µA
kV
kV
kV
ESD (Note 5)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V unless otherwise noted. (Note 2)
SYMBOL
f
MAX
t
PLHD
, t
PHLD
Δt
PD
t
SKEWD
t
RD
, t
FD
t
ZLD
, t
ZHD
t
LZD
, t
HZD
t
ZHSD
, t
ZLSD
t
SHDND
PARAMETER
Maximum Data Rate
Driver Input to Output
Driver Input to Output Difference
|t
PLHD
– t
PHLD
|
Driver Output A to Output B
Driver Rise or Fall Time
Driver Enable Time
Driver Disable Time
Driver Enable from Shutdown
Time to Shutdown
CONDITIONS
(Note 3)
R
DIFF
= 54Ω, C
L
= 100pF (Figure 4)
R
DIFF
= 54Ω, C
L
= 100pF (Figure 4)
R
DIFF
= 54Ω, C
L
= 100pF (Figure 4)
R
DIFF
= 54Ω, C
L
= 100pF (Figure 4)
R
L
= 27Ω, C
L
= 100pF,
RE
= 0V (Figure 5)
R
L
= 27Ω, C
L
= 100pF,
RE
= 0V (Figure 5)
R
L
= 27Ω, C
L
= 100pF,
RE
= High (Figure 5)
R
L
= 27Ω, C
L
= 100pF,
RE
= High (Figure 5)
(Note 3)
R
DIFF
= 54Ω, C
L
= 100pF (Figure 4)
R
DIFF
= 54Ω, C
L
= 100pF (Figure 4)
R
DIFF
= 54Ω, C
L
= 100pF (Figure 4)
R
DIFF
= 54Ω, C
L
=100pF (Figure 4)
R
L
= 27Ω, C
L
= 100pF,
RE
= 0V (Figure 5)
R
L
= 27Ω, C
L
= 100pF,
RE
= 0V (Figure 5)
R
L
= 27Ω, C
L
= 100pF,
RE
= High (Figure 5)
l
l
l
l
l
l
l
l
l
swiTchinG characTerisTics
Driver – High Speed (LTC2862A-1)
MIN
20
TYP
MAX
UNITS
Mbps
25
2
50
5
±10
ns
ns
ns
ns
ns
ns
µs
ns
4
25
45
5
50
15
50
75
10
90
Driver – Slew Rate Limited (LTC2862A-2)
f
MAXS
Δt
PDS
t
SKEWDS
t
RDS
, t
FDS
t
ZLDS
, t
ZHDS
t
LZDS
, t
HZDS
Maximum Data Rate
Driver Input to Output Difference
|t
PLHDS
– t
PHLDS
|
Driver Output A to Output B
Driver Rise or Fall Time
Driver Enable Time
Driver Disable Time
l
l
l
l
l
l
l
l
250
850
10
1500
150
±500
500
800
400
45
6
1200
800
75
11
kbps
ns
ns
ns
ns
ns
ns
µs
t
PLHDS
, t
PHLDS
Driver Input to Output
t
ZHSDS
, t
ZLSDS
Driver Enable from Shutdown
4
2862af
For more information
www.linear.com/LTC2862A
LTC2862A
swiTchinG characTerisTics
SYMBOL
t
SHDNDS
Receiver
t
PLHR
, t
PHLR
Receiver Input to Output (LTC2862A-1)
C
L
= 15pF, V
CM
= 0V, |V
AB
| = 1.5V,
t
R
and t
F
< 4ns (Figure 6)
C
L
= 15pF, V
CM
= 0V, |V
AB
| = 1.5V,
t
R
and t
F
< 4ns (Figure 6)
C
L
= 15pF (Figure 6)
C
L
= 15pF (Figure 6)
C
L
= 15pF, V
CM
= 0V, |V
AB
| = 1.5V,
t
R
and t
F
< 4ns (Figure 8)
C
L
= 15pF, V
CM
= 0V, |V
AB
| = 1.5V,
t
R
and t
F
< 4ns (Figure 8)
C
L
= 15pF, V
CM
= 0V, |V
AB
| = 1.5V,
t
R
and t
F
< 4ns (Figure 8)
C
L
= 15pF, V
CM
= 0V, |V
AB
| = 1.5V,
t
R
and t
F
< 4ns (Figure 8)
C
L
= 15pF (Figure 6)
R
L
= 500Ω, C
L
= 15pF, DE = High
(Figure 7)
R
L
= 500Ω, C
L
= 15pF, DE = High
(Figure 7)
R
L
= 500Ω, C
L
= 15pF, DE = High
(Figure 7)
R
L
= 500Ω, C
L
= 15pF, DE = High
(Figure 7)
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V unless otherwise noted. (Note 2)
PARAMETER
Time to Shutdown
CONDITIONS
R
L
= 27Ω, C
L
= 100pF,
RE
= High (Figure 5)
l
MIN
TYP
50
MAX
90
UNITS
ns
50
400
1
5
80
1.5
45
0.7
3
18
29
5
24
65
700
5
30
110
2.3
60
1.3
6
30
40
10
40
ns
ns
ns
ns
ns
µs
ns
µs
ns
ns
ns
µs
ns
t
PLHRS
, t
PHLRS
Receiver Input to Output (LTC2862A-2)
t
SKEWR
t
SKEWRS
t
PFSN
t
PFSNS
t
PFSX
t
PFSXS
t
RR
, t
FR
t
ZLR
, t
ZHR
t
LZR
, t
HZR
t
ZHSR
, t
ZLSR
t
SHDNR
Differential Receiver Skew
|t
PLHR
– t
PHLR
| (LTC2862A-1)
Differential Receiver Skew
|t
PLHRS
– t
PHLRS
| (LTC2862A-2)
Failsafe Enter Delay (LTC2862A-1)
Failsafe Enter Delay (LTC2862A-2)
Failsafe Exit Delay (LTC2862A-1)
Failsafe Exit Delay (LTC2862A-2)
Receiver Output Rise or Fall Time
Receiver Enable Time
Receiver Disable Time
Receiver Enable from Shutdown
Time to Shutdown
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3:
Maximum data rate is guaranteed by other measured parameters
and is not tested directly.
Note 4:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150ºC when overtemperature protection is active.
Continuous operation above the specified maximum operating temperature
主题：自备终端(BYOD)发展趋势;用员工自己的移动设备来控制对工作设施及设备的使用，会对信息安全产生怎样的影响;在不使公司有安全风险或不损害员工隐私的前提下，有哪些方式能安全地实现这样的设施及设备使用。 自备终端(Bring Your Own Device，简称BYOD)，即企业允许员工离职时保留自己的手机，这种做法正日益流行。如今智能手机功能也越来越多，我们不仅能用自己的手机访问电脑、网...[详细]
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