Key facts
- Brand
- Intel
- Model
- LXT9785E
- Category
- Motherboard
- Industry
- Computers
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-10
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Intel LXT9785/LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers Datasheet
The Intel LXT9785 and LXT9785E are 8‑port Fast Ethernet PHY transceivers that support IEEE 802.3 physical‑layer applications at 10 Mbps and 100 Mbps. Each port can operate over twisted‑pair (10BASE‑T, 100BASE‑TX) or LVPECL for 100BASE‑FX fiber, and the devices include auto‑MDI/MDIX and optional DTE detection for IP‑telephony power delivery. The transceivers run from a single 2.5 V supply and consume about 250 mW per port.
The datasheet provides a block diagram, pin and ball assignments for PQFP and BGA packages, functional descriptions, electrical specifications, timing diagrams, power and clock requirements, auto‑negotiation behavior, cable‑diagnostics procedures, design recommendations, and ordering information for various package formats.
Intel LXT9785E specifications
| Number of ports | 8 |
|---|---|
| Supported data rates | 10 Mbps and 100 Mbps |
| Interface types per port | Twisted‑pair (10BASE‑T, 100BASE‑TX) and LVPECL (100BASE‑FX) |
| Supply voltage | 2.5 V |
| Power consumption per port | 250 mW typical |
| Operating temperature range | -40 °C to +85 °C (LXT9785HE) |
| Auto MDI/MDIX | Supported |
| DTE detection (IP‑telephony) | LXT9785E only |
Source: Intel LXT9785/LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers Datasheet
All Intel LXT9785E documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What interfaces are available on each LXT9785 port?
Each port can be configured for twisted‑pair (10BASE‑T, 100BASE‑TX) or LVPECL for 100BASE‑FX fiber operation.
From: Intel LXT9785/LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers Datasheet
What supply voltage does the LXT9785 require?
The device operates from a single 2.5 V power supply.
From: Intel LXT9785/LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers Datasheet
What is the difference between the LXT9785 and LXT9785E?
The LXT9785E is an enhanced version that includes IP‑telephony features and can detect Data Terminal Equipment (DTE) for remote powering, which the LXT9785 does not have.
From: Intel LXT9785/LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers Datasheet
What supply voltage do the transceivers require?
They operate from a single 2.5 V power supply.
From: Intel LXT9785/LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers Datasheet