LTC2859/LTC2861
20Mbps RS485 Transceivers
with Integrated Switchable
Termination
Fea T Descrip T
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Integrated, Logic-Selectable 120 T ermination The LTC 2859 and LTC2861 are low power, 20Mbps
Resistor RS485/422 transceivers operating on 5V supplies. The
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20Mbps Max Data Rate receiver includes a logic-selectable 120 termination,
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No Damage or Latchup to ESD: 15kV HBM one-eighth unit load supporting up to 256 nodes per bus
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High Input Impedance Supports 256 Nodes (C-, I-grades), and a failsafe feature that guarantees a high
(C-, I-Grades) output state under conditions of floating or shorted inputs.
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Operation Up to 105C (LTC2859H)
The driver features a logic-selectable low-EMI 250kbps
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250kbps Low-EMI Mode
operating mode, and maintains a high output impedance
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Guaranteed Failsafe Receiver Operation Over the
over the entire common mode range when disabled or
Entire Common Mode Range
when the supply is removed. Excessive power dissipation
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Current Limited Drivers and Thermal Shutdown
caused by bus contention or a fault is prevented by current
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Delayed Micropower Shutdown (5A Max)
limiting all outputs and by a thermal shutdown.
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Power Up/Down Glitch-Free Driver Outputs
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Enhanced ESD protection allows the LTC2859 and LTC2861
Low Operating Current (900A Max in Receive Mode)
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to withstand 15kV (human body model) on the transceiver
Meets All TIA/EIA-485-A Specifications
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interface pins without latchup or damage.
Available in 10-Pin 3mm 3mm DFN, 12-Pin
4mm 3mm DFN and 16-Pin SSOP Packages
p D T s T Gui De
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PART NUMBER DUPLEX PACKAGE
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Low Power RS485/RS422 Transceiver
LTC2859 Half DFN-10
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Level Translator
LTC2861 Full SSOP-16, DFN-12
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Backplane Transceiver
L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical a T
LTC2859 LTC2859
LTC2859 at 20Mbps
RO R R RO
RE RE
DI
TE TE
120
DE 120 DE
Y
DI D D DI
Z
SLO SLO
LTC2859
YZ
2859/61 TA01
120
285961 TA02
2V/DIV 20ns/DIV
R
D
RORE TE DE DI SLO
285961fc
1
ion pplica
ions pplica
ion elec uc ro
ion uresLTC2859/LTC2861
(Note 1)
a T e m r a T Gs
Supply Voltage (V ) ................................... 0.3V to 7V Operating Temperature (Note 4)
CC
Logic Input Voltages (RE, DE, DI, TE, SLO) .... 0.3V to 7V LTC2859C, LTC2861C .............................. 0C to 70C
Interface I/O: LTC2859I, LTC2861I ............................40C to 85C
A, B, Y, Z .......................................(V 15V) to +15V LTC2859H .......................................... 40C to 105C
CC
(A-B) or (B-A) with Terminator Enabled ..................6V Storage Temperature Range .................. 65C to 125C
Receiver Output Voltage (RO) ........0.3V to (V +0.3V) Lead Temperature (Soldering, 10 sec)
CC
GN Package ......................................................300C
p c Fi G T
TOP VIEW
TOP VIEW
TOP VIEW 1 16
RO V
CC
RO 1 12 V
CC
2 15
RE A
RO 1 10 V
RE 2 11 A
CC
3 14
DE B
RE 9 B
2 13
11
DE 3 10 B
4 13
DI Z
DE 3 A
8
DI 4 9 Z
5 12
4 TE Y
DI 7 SLO
TE 5 8 Y
TE 5 6 GND 6 11
GND SLO
GND 6 7 SLO
7 10
NC NC
DD PACKAGE
8 9
NC NC
10-LEAD (3mm 3mm) PLASTIC DFN
DE PACKAGE
EXPOSED PAD (PIN 11) PCB GND CONNECTION 12-LEAD (4mm 3mm) PLASTIC DFN
GN PACKAGE
T = 125C, = 43C/W
JMAX JA EXPOSED PAD (PIN 13) PCB GND CONNECTION
16-LEAD (NARROW 0.150) PLASTIC SSOP
= 3C/W
JC T = 125C, = 43C/W
JMAX JA
T = 125C, = 110C/W
JMAX JA
= 4.3C/W
JC
= 40C/W
JC
o r D i n F T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2861CDE#PBF LTC2861CDE#TRPBF 2861 0C to 70C
12-Lead (4mm 3mm) Plastic DFN
LTC2861IDE#PBF LTC2861IDE#TRPBF 2861 40C to 85C
12-Lead (4mm 3mm) Plastic DFN
LTC2861CGN#PBF LTC2861CGN#TRPBF 2861 16-Lead Plastic SSOP 0C to 70C
LTC2861IGN#PBF LTC2861IGN#TRPBF 2861I 16-Lead Plastic SSOP 40C to 85C
LTC2859CDD#PBF LTC2859CDD#TRPBF LBNX 0C to 70C
10-Lead (3mm 3mm) Plastic DFN
LTC2859IDD#PBF LTC2859IDD#TRPBF LBNX 40C to 85C
10-Lead (3mm 3mm) Plastic DFN
LTC2859HDD#PBF LTC2859HDD#TRPBF LBNX 40C to 105C
10-Lead (3mm 3mm) Plastic DFN
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: