LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
20Mbps and Slew Rate Limited
15kV RS485/RS422 Transceivers
FEATURES DESCRIPTION
n
20Mbps or Low EMI 250kbps Maximum Data Rate The LTC 2856-1, LTC2856-2, LTC2857-1, LTC2857-2,
n
No Damage or Latchup to ESD: 15kV HBM LTC2858-1 and LTC2858-2 are low power, RS485/RS422
n
High Input Impedance Supports 256 Nodes transceivers operating on 5V supplies at maximum data
(C, I-Grade) rates of 20Mbps or 250kbps for low EMI. The receiver has
n
Operation Up to 125C (H-Grade) a one-eighth unit load, supporting up to 256 nodes per bus
n
Guaranteed Failsafe Receiver Operation Over the (C, I-Grade), and a failsafe feature that guarantees a high
Entire Common Mode Range output state under conditions of floating or shorted inputs.
n
Current Limited Drivers and Thermal Shutdown
The driver maintains a high output impedance over the
n
Delayed Micropower Shutdown: 5A Maximum
entire common mode range when disabled or when the
(C, I-Grade)
supply is removed. Excessive power dissipation caused
n
Power Up/Down Glitch-Free Driver Outputs
by bus contention or a fault is prevented by current limit-
n
Low Operating Current: 900A Maximum in Receive
ing all outputs and by thermal shutdown.
Mode
n Enhanced ESD protection allows these parts to withstand
Compatible with TIA/EIA-485-A Specifications
n 15kV (human body model) on the transceiver interface
Available in 8-Lead and 10-Lead 3mm 3mm DFN
pins without latchup or damage.
and 8-Lead and 10-Lead MSOP Packages
PART MAX DATA
APPLICATIONS NUMBER RATE (Mbps) DUPLEX PACKAGE
LTC2856-1 20 Half MSOP-8, DFN-8
n
Low Power RS485/RS422 Transceiver
LTC2856-2 0.25 Half MSOP-8, DFN-8
n
Level Translator
LTC2857-1 20 Full MSOP-8, DFN-8
n
Backplane Transceiver
LTC2857-2 0.25 Full MSOP-8, DFN-8
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
LTC2858-1 20 Full MSOP-10, DFN-10
AnalogDevices, Inc. All other trademarks are the property of their respective owners.
LTC2858-2 0.25 Full MSOP-10, DFN-10
TYPICAL APPLICATION
LTC2858-1 at 20Mbps
LTC2856-1
RO1
V
CC1
R
DI
RE1
R
T
DE1
Y
D
DI1
GND1
Z
LTC2856-1
R
T
Y-Z
RO2
V
CC2
R
RE2
DE2
D
DI2
GND2
2856 TA01b
285678 TA01a
20ns/DIV
285678fg
1
For more information www.linear.com/LTC2856-1
2V/DIVLTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Storage Temperature Range
Supply Voltage (V ) ................................... 0.3V to 7V
CC
MSOP ................................................ 65C to 150C
Logic Input Voltages (RE, DE, DI) ................ 0.3V to 7V
DFN .................................................... 65C to 150C
Interface I/O (A, B, Y, Z) .................... (V 15V) to 15V
CC
Lead Temperature (Soldering, 10 sec)
Receiver Output Voltage (RO) .......0.3V to (V + 0.3V)
CC
MSOP ...............................................................300C
Operating Temperature Range (Note 4)
LTC285xC ................................................ 0C to 70C
LTC285xI .............................................40C to 85C
LTC285xH .......................................... 40C to 125C
PACKAGE INFORMATION
LTC2856
TOP VIEW
TOP VIEW
RO 1 8 V
CC
RO 1 8 V
CC
RE 2 7 B
RE 2 7 B
9
DE 3 6 A
DE 3 6 A
DI 4 5 GND
DI 4 5 GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
DD PACKAGE
T = 150C, = 163C/W, = 40C/W
8-LEAD (3mm 3mm) PLASTIC DFN JMAX JA JC
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
T = 150C, = 43C/W, = 5.5C/W
JMAX JA JC
LTC2857
TOP VIEW
TOP VIEW
V 1 8 A
CC
V 1 8 A
CC
RO 2 7 B
RO 2 7 B
9
6 Z
DI 3
DI 3 6 Z
GND 4 5 Y
GND Y
4 5
MS8 PACKAGE
8-LEAD PLASTIC MSOP
DD PACKAGE
T = 150C, = 163C/W, = 40C/W
JMAX JA JC
8-LEAD (3mm 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
T = 150C, = 43C/W, = 5.5C/W
JMAX JA JC
LTC2858
TOP VIEW
TOP VIEW
RO 1 10 V
CC
RO 1 10 V
CC
RE 2 9 A
RE 2 9 A
11 DE 3 8 B
DE 3 8 B
DI 4 7 Z
DI 4 7 Z
GND 5 6 Y
6
GND 5 Y
MS PACKAGE
10-LEAD PLASTIC MSOP
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T = 150C, = 160C/W, = 45C/W
JMAX JA JC
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
T = 150C, = 43C/W, = 5.5C/W
JMAX JA JC
285678fg
2
For more information www.linear.com/LTC2856-1