Overview
Features and Benefits
- Operates with 3.3 V supply
- EIA RS-422 and RS-485 compliant over full CM range
- 19 kΩ input impedance
- Up to 50 transceivers on bus
- 20 Mbps data rate
- Short-circuit protection
- Specified over full temperature range
- Thermal shutdown
- Interoperable with 5 V logic
- 840 μA supply current
- 2 nA shutdown current
- See data sheet for additional features
Product Details
The ADM3491-1 is a low power, differential line transceiver designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes it ideal for power-sensitive applications. It is suitable for communication on multipoint bus transmission lines.
The ADM3491-1 is intended for balanced data transmission and complies with both Electronic Industries Association (EIA) Standards RS-485 and RS-422. It contains a differential line driver and a differential line receiver, making it suitable for full-duplex data transfer.
The input impedance is 19 kΩ, allowing up to 50 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. This feature forces the driver output into a high impedance state if a significant temperature increase is detected in the internal driver circuitry during fault conditions.
If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state.
The ADM3491-1 is fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technology.
APPLICATIONS
- Telecommunications
- DTE–DCE interface
- Packet switching
- Local area networks
- Data concentration
- Data multiplexers
- Integrated services digital network (ISDN)
- AppleTalk Industrial controls
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| ADM3491ANZ-1 | Material Declaration | Reliability Data | 14-Lead PDIP | |
| ADM3491ARU-1 | Material Declaration | Reliability Data | 16-Lead TSSOP | |
| ADM3491ARU-1REEL | Material Declaration | Reliability Data | 16-Lead TSSOP | |
| ADM3491ARUZ-1 | Material Declaration | Reliability Data | 16-Lead TSSOP | |
| ADM3491ARUZ-1REEL | Material Declaration | Reliability Data | 16-Lead TSSOP | |
| ADM3491ARUZ-1REEL7 | Material Declaration | Reliability Data | 16-Lead TSSOP | |
| ADM3491ARZ-1 | Material Declaration | Reliability Data | 14-Lead SOIC | |
| ADM3491ARZ-1REEL | Material Declaration | Reliability Data | 14-Lead SOIC | |
| ADM3491ARZ-1REEL7 | Material Declaration | Reliability Data | 14-Lead SOIC | |
| Wafer Fabrication Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
ADM3491-1 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
A Sample link will be shown above, next to the part, only for parts that are included in our sample program. Selecting the Sample button will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.