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Linear Technology Electronic Components Datasheet

LTC2861CDE Datasheet

20Mbps RS485 Transceivers

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LTC2859/LTC2861
Features
20Mbps RS485 Transceivers
with Integrated Switchable
Termination
Description
n Integrated, Logic-Selectable 120Termination
Resistor
n 20Mbps Max Data Rate
n No Damage or Latchup to ESD: ±15kV HBM
n High Input Impedance Supports 256 Nodes
(C-, I-Grades)
n Operation Up to 105°C (LTC2859H)
n 250kbps Low-EMI Mode
n Guaranteed Failsafe Receiver Operation Over the
Entire Common Mode Range
n Current Limited Drivers and Thermal Shutdown
n Delayed Micropower Shutdown (5µA Max)
n Power Up/Down Glitch-Free Driver Outputs
n Low Operating Current (900µA Max in Receive Mode)
n Meets All TIA/EIA-485-A Specifications
n Available in 10-Pin 3mm × 3mm DFN, 12-Pin
4mm × 3mm DFN and 16-Pin SSOP Packages
Applications
n Low Power RS485/RS422 Transceiver
n Level Translator
n Backplane Transceiver
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
The LTC®2859 and LTC2861 are low power, 20Mbps
RS485/422 transceivers operating on 5V supplies. The
receiver includes a logic-selectable 120Ω termination,
one-eighth unit load supporting up to 256 nodes per bus
(C-, I-grades), and a failsafe feature that guarantees a high
output state under conditions of floating or shorted inputs.
The driver features a logic-selectable low-EMI 250kbps
operating mode, and maintains a high output impedance
over the entire common mode range when disabled or
when the supply is removed. Excessive power dissipation
caused by bus contention or a fault is prevented by current
limiting all outputs and by a thermal shutdown.
Enhanced ESD protection allows the LTC2859 and LTC2861
to withstand ±15kV (human body model) on the transceiver
interface pins without latchup or damage.
Product Selection Guide
PART NUMBER
LTC2859
LTC2861
DUPLEX
Half
Full
PACKAGE
DFN-10
SSOP-16, DFN-12
Typical Application
RO
R
RE
TE
DE
DI
D
SLO
LTC2859
120Ω
LTC2859
120Ω
120Ω
LTC2859
R
RO
RE
TE
DE
D
DI
SLO
2859/61 TA01
R
D
LTC2859 at 20Mbps
DI
Y
Z
Y–Z
2V/DIV
20ns/DIV
285961 TA02
RO RE TE DE DI SLO
285961fc
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Linear Technology Electronic Components Datasheet

LTC2861CDE Datasheet

20Mbps RS485 Transceivers

No Preview Available !

LTC2859/LTC2861
Absolute Maximum Ratings (Note 1)
Supply Voltage (VCC).................................... –0.3V to 7V
Logic Input Voltages (RE, DE, DI, TE, SLO)..... –0.3V to 7V
Interface I/O:
A, B, Y, Z........................................(VCC –15V) to +15V
(A-B) or (B-A) with Terminator Enabled...................6V
Receiver Output Voltage (RO).........–0.3V to (VCC +0.3V)
Operating Temperature (Note 4)
LTC2859C, LTC2861C............................... 0°C to 70°C
LTC2859I, LTC2861I.............................–40°C to 85°C
LTC2859H........................................... –40°C to 105°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
GN Package....................................................... 300°C
Pin Configuration
TOP VIEW
RO 1
10 VCC
RE 2
11
9B
DE 3
8A
DI 4
7 SLO
TE 5
6 GND
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) PCB GND CONNECTION
TJMAX = 125°C, θJA = 43°C/W
θJC = 3°C/W
TOP VIEW
RO 1
12 VCC
RE 2
11 A
DE 3
13
10 B
DI 4
9Z
TE 5
8Y
GND 6
7 SLO
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
EXPOSED PAD (PIN 13) PCB GND CONNECTION
TJMAX = 125°C, θJA = 43°C/W
θJC = 4.3°C/W
TOP VIEW
RO 1
RE 2
DE 3
DI 4
TE 5
GND 6
NC 7
NC 8
16 VCC
15 A
14 B
13 Z
12 Y
11 SLO
10 NC
9 NC
GN PACKAGE
16-LEAD (NARROW 0.150) PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
θJC = 40°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2861CDE#PBF
LTC2861CDE#TRPBF 2861
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LTC2861IDE#PBF
LTC2861IDE#TRPBF
2861
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LTC2861CGN#PBF
LTC2861CGN#TRPBF 2861
16-Lead Plastic SSOP
0°C to 70°C
LTC2861IGN#PBF
LTC2861IGN#TRPBF
2861I
16-Lead Plastic SSOP
–40°C to 85°C
LTC2859CDD#PBF
LTC2859CDD#TRPBF LBNX
10-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LTC2859IDD#PBF
LTC2859IDD#TRPBF
LBNX
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC2859HDD#PBF
LTC2859HDD#TRPBF LBNX
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 105°C
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/
285961fc
2


Part Number LTC2861CDE
Description 20Mbps RS485 Transceivers
Maker Linear Technology
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LTC2861CDE Datasheet PDF






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