LINEAR TECHNOLOGY LTC1484 User's Manual
Summary
This low-power RS485/RS422 transceiver is designed for reliable data communication in demanding residential and industrial environments. It features a fail-safe receiver that guarantees signal integrity, even when the input lines are open, shorted, or floating. The comprehensive manual details its advanced electrical specifications, includes robust ESD protection (–15kV), and outlines operational guidelines necessary for engineers building resilient bus systems supporting up to 32 transceivers.
Page 1 Text Content
LTC1484 Low Power
RS485 Transceiver with Receiver Fail-Safe
FEATURES DESCRIPTIO
No Damage or Latchup to ±15k V ESD (Human The LTC®1484 is a low power RS485 compatible trans- Body Model), IEC-1000-4-2 Level 4 Contact (±8k V) ceiver. In receiver mode, it offers a fail-safe feature which and Level 3 (±8k V) Air Gap Specifications guarantees a high receiver output state when the inputs Guaranteed High Receiver Output State for Floating, are left open, shorted together or terminated with no
Shorted or Terminated Inputs with No Signal signal present. No external components are required to Present ensure the high receiver output state.
Drives Low Cost Residential Telephone Wires
Both driver and receiver feature three-state outputs with
Low Power: ICC = 700µA Max with Driver Disabled
separate receiver and driver control pins. The driver
ICC = 900µA Max for Driver Enable with No Load
outputs maintain high impedance over the entire com-
20µA Max Quiescent Current in Shutdown Mode
mon mode range when three-stated. Excessive power
Single 5V Supply
dissipation caused by bus contention or faults is pre-
–7V to 12V Common Mode Range Permits ±7V
vented by a thermal shutdown circuit that forces the
Ground Difference Between Devices on the Data Line
driver outputs into a high impedance state.
Power Up/Down Glitch-Free Driver Outputs
Up to 32 Transceivers on the Bus Enhanced ESD protection allows the LTC1484 to with- Pin Compatible with the LTC485 stand ±15k V (human body model), IEC-1000-4-2 level 4 Available in 8-Lead MSOP, PDIP and SO Packages (±8k V) contact and level 3 (±8k V) air discharge ESD without latchup or damage. The LTC1484 is fully specified over the commercial and
APPLICATIO
industrial temperature ranges and is available in 8-lead
Battery-Powered RS485/RS422 Applications MSOP, PDIP and SO packages.■ Low Power RS485/RS422 Transceiver
, LTC and LT are registered trademarks of Linear Technology Corporation.
Level Translator
TYPICAL APPLICATIO
Driving a 2000 Foot STP Cable
RS485 Interface
LTC1484 LTC1484
RO1 VCC1 VCC2 RO2
RE1 RE2
DE1 DE2 A2
DI1 GND1 GND2 DI2
1484 TA01
Dl1 ↑↓ DE1 = VCC 1484 TA01a
Dl2 = 0 DE2 = 0 RE1 = RE2 = 0
Page Summary Contents For LINEAR TECHNOLOGY LTC1484 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 224.93 KB |
| Published | June 17, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What fail-safe feature does the LTC1484 guarantee in receiver mode?
It guarantees a high receiver output state regardless of whether the inputs are left open, shorted together, or terminated with no signal present.
Can the LTC1484 drive multiple transceivers on the bus?
Yes, it supports up to 32 Transceivers on the Bus.
Does the device require external components for its fail-safe feature?
No, no external components are required to ensure the high receiver output state.