National Semiconductor DS485 Low Power RS-485/RS-422 Multipoint Transceiver Data Sheet
Summary
This low-power transceiver is essential for building robust, multi-point data networks utilizing RS-485 and RS-422 differential signaling. Designed to meet TIA/EIA industry standards, it ensures reliable communication by operating from a single 5V supply while providing failsafe features and current limiting protection. The comprehensive manual details all necessary specifications—including electrical characteristics, absolute maximum ratings, and various packaging options—making it perfect for engineers developing industrial or commercial equipment that requires high-reliability, extended-range data bus connections connecting up to 32 transceivers.
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Low ow er -485/R -422 ultipoint Transceiver
DS485 Low Power RS-485/RS-422 Multipoint Transceiver General Description Features
The DS485 is low-power transceiver for RS-485 and Meets TIA/EIA RS-485 multipoint standard
RS-422 communication. The device contains one driver and Guaranteed full load output voltage (V OD3) one receiver. The drivers slew rate allows for operation up to Low quiescent current: µA typ 2.5 Mbps (see Applications Information section). −7V to +12V common-mode input voltage range The transceiver draws µA of supply current when un- TRI-STATE outputs on driver and receiver loaded or fully loaded with the driver disabled and operates AC performance: from single +5V supply. Driver transition time: ns typ The driver is short-circuit current limited and is protected Driver propagation delay: ns typ against excessive power dissipation by thermal shutdown Driver skew: ns typ circuitry that places the driver outputs into TRI-STATE® Receiver propagation delay: ns typ
(High Impedance state) under fault conditions. The driver Receiver skew: ns typ
guarantees minimum of 1.5V differential output voltage Half-duplex flow through pinout with maximum loading across the common mode range Operates from single 5V supply (VOD3).
Allows up to transceivers on the bus
The receiver has failsafe feature that guarantees Current-limiting and thermal shutdown for driver logic-high output if the input is open circuit. overload protection The DS485 is available in surface mount and DIP packages Industrial temperature range operation and is characterized for Industrial and Commercial tempera- Pin and functional compatible with MAX485 and LTC485 ture range operation.
Connection and Logic Diagram Truth Table
DRIVER SECTION
DIP and SOIC
RE* DE DI
RECEIVER SECTION RE* DE A-B RO
DS012880-1
Order Number Temp. Range Package/###
OPEN*
DS485N 0˚C to +70˚C DIP/N08E
*Note: Non Terminated, Open Input only
DS485M 0˚C to +70˚C SOP/M08A indeterminate
TRI-STATE
DS485TN −40˚C to +85˚C DIP/N08E DS485TM −40˚C to +85˚C SOP/M08A
TRI-STATE® is registered trademark of National Semiconductor Corporation.
National Semiconductor Corporation DS012880 www.national.com
Page Summary Contents For National Semiconductor DS485 Low Power RS-485/RS-422 Multipoint Transceiver Data Sheet
Manual Details
| Brand | National |
|---|---|
| Pages | 10 |
| File Size | 142.63 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What is the maximum number of transceivers allowed on the bus?
The DS485 allows up to 32 transceivers to be connected on a single bus.
What voltage range can I use for connection?
It supports a common-mode input voltage from -7V to +12V, and operates using a single 5V supply.
Is this device compatible with other standard models?
Yes, it is pin and functional compatible with popular transceivers like MAX485 and LTC485.
What is the low-power consumption if I don't need full load?
When fully disabled or unloaded, the transceiver draws a typical quiescent current of 200 μA.