LTC485IN8 Linear Technology, LTC485IN8 Datasheet

IC TXRX INTERFACE RS485 LP 8DIP

LTC485IN8

Manufacturer Part Number
LTC485IN8
Description
IC TXRX INTERFACE RS485 LP 8DIP
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LTC485IN8

Number Of Drivers/receivers
1/1
Protocol
RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC485IN8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC485IN8#PBF
Manufacturer:
LT
Quantity:
14 930
Part Number:
LTC485IN8#PBF
Manufacturer:
LT/凌特
Quantity:
20 000
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APPLICATIONS
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TYPICAL APPLICATION
FEATURES
Low Power: I
Designed for RS485 Interface Applications
Single 5V supply
–7V to 12V Bus Common Mode Range Permits
±7V Ground Difference Between Devices on the Bus
Thermal Shutdown Protection
Power-Up/Down Glitch-Free Driver Outputs
Permit Live Insertion or Removal of Transceiver
Driver Maintains High Impedance in Three-State
or with the Power Off
Combined Impedance of a Driver Output and
Receiver Allows Up to 32 Transceivers on the Bus
70mV Typical Input Hysteresis
30ns Typical Driver Propagation Delays
with 5ns Skew for Up to 2.5MB Operation
Pin Compatible with ±60V Protected LT1785 and
52Mbps LTC1685
Low Power RS485/RS422 Transceiver
Level Translator
RO1
RO2
RE1
DE1
RE2
DE2
DI1
DI2
CC
= 300μA Typ
D
D
R
R
V
GND1
V
GND2
CC1
CC2
Rt
Rt
485 TA01a
DESCRIPTION
The LTC
ceiver designed for multipoint data transmission standard
RS485 applications with extended common mode range
(12V to –7V). It also meets the requirements of RS422.
The CMOS design offers signifi cant power savings over
its bipolar counterpart without sacrifi cing ruggedness
against overload of ESD damage.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common mode range. Excessive power dissipa-
tion caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state.
The receiver has a fail-safe feature which guarantees a
high output state when the inputs are left open.
The LTC485 is fully specifi ed over the commercial and
extended industrial temperature range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
A
B
®
485 is a low power differential bus/line trans-
Interface Transceiver
Low Power RS485
Driver Outputs
LTC485
485 TA01b
1
485fh

Related parts for LTC485IN8

LTC485IN8 Summary of contents

Page 1

... The LTC485 is fully specifi ed over the commercial and extended industrial temperature range. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. A ...

Page 2

... A ≤ 70°C A ≤ 125°C A PART MARKING* PACKAGE DESCRIPTION LTC485CN8 8-Lead Plastic DIP 485 8-Lead Plastic SOIC LTC485IN8 8-Lead Plastic DIP 485I 8-Lead Plastic SOIC LTC485MJ8 8-Lead Ceramic DIP PART MARKING* PACKAGE DESCRIPTION LTC485CN8 8-Lead Plastic DIP 485 8-Lead Plastic SOIC ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V Input High Voltage IH V Input Low Voltage IL I Input Current IN1 I Input Current (A, B) IN2 V Differential Input Threshold Voltage for Receiver –7V ...

Page 4

LTC485 TYPICAL PERFORMANCE CHARACTERISTICS Receiver Output Low Voltage vs Output Current 25° 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) 485 G01 Receiver Output Low Voltage vs ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Receiver |t – PLH PHL vs Temperature 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 –50 – 100 TEMPERATURE (°C) 485 G10 PIN FUNCTIONS RO (Pin 1): Receiver Output. ...

Page 6

LTC485 TEST CIRCUITS 485 F01 Figure 1. Driver DC Test Load DIFF Figure 3. Driver/Receiver Timing Test Circuit SWITCHING TIME WAVEFORMS ...

Page 7

SWITCHING TIME WAVEFORMS OD2 A, B –V OD2 FUNCTION TABLES LTC485 Transmitting INPUTS LINE ...

Page 8

LTC485 APPLICATIONS INFORMATION Basic Theory of Operation Previous RS485 transceivers have been designed using bipolar technology because the common mode range of the device must extend beyond the supplies and the device must be immune to ESD damage and latchup. ...

Page 9

APPLICATIONS INFORMATION The LTC485 output stage will maintain a high impedance state until the breakdown of the N-channel or P-channel is reached when going positive or negative respectively. The output will be clamped to either V Zener voltage plus a ...

Page 10

LTC485 APPLICATIONS INFORMATION LTC485 Line Length vs Data Rate The maximum line length allowable for the RS422/RS485 standard is 4000 feet. A LTC485 B 4000 FT 26AWG NOISE TWISTED PAIR TTL GENERATOR IN Figure 14. Line Length Test Circuit Using ...

Page 11

TYPICAL APPLICATION PACKAGE DESCRIPTION CORNER LEADS OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .300 BSC (7.62 BSC) .008 – .018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS Typical RS485 Network ...

Page 12

LTC485 PACKAGE DESCRIPTION .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( ) +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR ...

Page 13

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 14

... ESD, 20Mbps, 900μA Supply Current, Fail-Safe ±15kV ESD, 20Mbps, 900μA Supply Current, Integrated Switchable Termination ±15kV ESD, 900μA Supply Current, Fail-Safe ±15kV ESD, 900μA Supply Current, Integrated Switchable Termination www.linear.com ● 485fh LT 0609 REV H • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994 ...

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