LTC2857-2 Transceivers Datasheet

LTC2857-2 Datasheet, PDF, Equivalent


Part Number

LTC2857-2

Description

20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers

Manufacture

Linear Technology

Total Page 20 Pages
Datasheet
Download LTC2857-2 Datasheet


LTC2857-2
FEATURES
20Mbps or Low EMI 250kbps Maximum Data Rate
No Damage or Latchup to ESD: ±15kV HBM
High Input Impedance Supports 256 Nodes
(C, I-Grade)
Operation Up to 125°C (H-Grade)
Guaranteed Failsafe Receiver Operation Over the
www.DaEtnatSirheeeCto4Um.cmomon Mode Range
Current Limited Drivers and Thermal Shutdown
Delayed Micropower Shutdown: 5μA Maximum
(C, I-Grade)
Power Up/Down Glitch-Free Driver Outputs
Low Operating Current: 900μA Maximum in Receive
Mode
Compatible with TIA/EIA-485-A Specifications
Available in 8-Lead and 10-Lead 3mm × 3mm DFN
and 8-Lead and 10-Lead MSOP Packages
APPLICATIONS
Low Power RS485/RS422 Transceiver
Level Translator
Backplane Transceiver
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
20Mbps and Slew Rate
Limited 15kV RS485/RS422
Transceivers
DESCRIPTION
The LTC®2856-1, LTC2856-2, LTC2857-1, LTC2857-2,
LTC2858-1 and LTC2858-2 are low power, RS485/RS422
transceivers operating on 5V supplies at maximum data
rates of 20Mbps or 250kbps for low EMI. The receiver has
a one-eighth unit load, supporting up to 256 nodes per
bus (C, I-Grade), and a failsafe feature that guarantees a
high output state under conditions of floating or shorted
inputs.
The driver 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 thermal shutdown.
Enhanced ESD protection allows these parts to withstand
±15kV (human body model) on the transceiver interface
pins without latchup or damage.
PART
NUMBER
LTC2856-1
LTC2856-2
LTC2857-1
LTC2857-2
LTC2858-1
LTC2858-2
MAX DATA
RATE (Mbps)
20
0.25
20
0.25
20
0.25
DUPLEX
Half
Half
Full
Full
Full
Full
PACKAGE
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-10, DFN-10
MSOP-10, DFN-10
TYPICAL APPLICATION
LTC2856-1
RO1
R
RE1
VCC1
DE1
DI1 D
GND1
RT
LTC2856-1
RO2
R
RE2
VCC2
RT
DE2
DI2 D
GND2
285678 TA01a
LTC2858-1 at 20Mbps
DI
Y
Z
Y-Z
20ns/DIV
2856 TA01b
285678fe
1

LTC2857-2
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (VCC) ................................... –0.3V to 7V
Logic Input Voltages (RE, DE, DI) ................ –0.3V to 7V
Interface I/O (A, B, Y, Z) ....................(VCC – 15V) to 15V
Receiver Output Voltage (RO) .......–0.3V to (VCC + 0.3V)
Operating Temperature Range (Note 4)
LTC285xC ................................................ 0°C to 70°C
LTC285xI.............................................. –40°C to 85°C
LTC285xH .......................................... –40°C to 125°C
Storage Temperature Range
MSOP ................................................ –65°C to 150°C
DFN.................................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
www.DataSheet4U.com
PACKAGE INFORMATION
LTC2856
TOP VIEW
RO 1
8 VCC
RE 2
7B
9
DE 3
6A
DI 4
5 GND
LTC2857
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TJMAX = 150°C, θJA = 43°C/W, θJC = 3°C/W
TOP VIEW
VCC 1
8A
RO 2
7B
9
DI 3
6Z
GND 4
5Y
LTC2858
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TJMAX = 150°C, θJA = 43°C/W, θJC = 3°C/W
TOP VIEW
RO 1
RE 2
DE 3
DI 4
GND 5
10 VCC
9A
11 8 B
7Z
6Y
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
TJMAX = 150°C, θJA = 43°C/W, θJC = 3°C/W
TOP VIEW
RO 1
RE 2
DE 3
DI 4
8 VCC
7B
6A
5 GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 200°C/W, θJC = 40°C/W
TOP VIEW
VCC 1
RO 2
DI 3
GND 4
8A
7B
6Z
5Y
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 200°C/W, θJC = 40°C/W
RO 1
RE 2
DE 3
DI 4
GND 5
TOP VIEW
10 VCC
9A
8B
7Z
6Y
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 120°C/W, θJC = 45°C/W
285678fe
2


Features LTC2856-1/LTC2856-2 LTC2857-1/LTC2857-2 LTC2858-1/LTC2858-2 20Mbps and Slew Rat e Limited 15kV RS485/RS422 Transceivers DESCRIPTION The LTC®2856-1, LTC2856-2 , LTC2857-1, LTC2857-2, LTC2858-1 and L TC2858-2 are low power, RS485/RS422 tra nsceivers operating on 5V supplies at m aximum data rates of 20Mbps or 250kbps for low EMI. The receiver has a one-eig hth unit load, supporting up to 256 nod es per bus (C, I-Grade), and a failsafe feature that guarantees a high output state under conditions of floating or shorted inputs. The driver maintains a high output impedance over the entire c ommon mode range when disabled or when the supply is removed. Excessive power dissipation caused by bus contention or a fault is prevented by current limiti ng all outputs and by thermal shutdown. Enhanced ESD protection allows these p arts to withstand ±15kV (human body mo del) on the transceiver interface pins without latchup or damage. PART NUMBER LTC2856-1 LTC2856-2 LTC2857-1 LTC2857-2 LTC2858-1 LTC2858-2 MAX DAT.
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