Key facts
- Brand
- Teridian
- Model
- 100BASE-TX
- Industry
- Industrial
- Documents
- 2
- Languages
- ZH · EN
- Last added
- 2012-05-08
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Teridian 78Q2120C 10/100BASE-TX Transceiver Data Sheet
The 78Q2120C transceiver provides full‑duplex 10BASE‑T and 100BASE‑TX operation compliant with IEEE‑802.3. It integrates a Media Independent Interface (MII), ENDEC, scrambler/descrambler, dual‑speed clock recovery, and a complete auto‑negotiation engine. The transmitter includes an on‑chip pulse‑shaper and low‑power line driver, while the receiver features an adaptive equalizer and baseline restoration circuit.
Power management modes include Chip Power‑Down, Receive Power Management, and Transmit High‑Impedance. The device operates from a single 3.3 V supply, offers several LED status indicators, and is packaged in a 64‑pin TQFP. It connects to the network via 1:1 isolation transformers without external filters. This manual is written in Chinese.
Teridian 100BASE-TX specifications
| Interface | Integrated MII (Media Independent Interface) |
|---|---|
| Data rates | 10BASE‑T / 100BASE‑TX |
| Supply voltage | 3.3 V ± 0.3 V |
| Package | 64‑Pin TQFP (JEDEC LQFP) |
| Transmit clock frequency (100BASE‑TX) | 125 MHz |
| Transmit clock frequency (10BASE‑T) | 20 MHz |
| Power‑saving modes | Chip Power‑Down, Receive Power Management, Transmit High‑Impedance |
| LED indicators | LINK, TX, RX, COL, 100, 10, FDX |
Source: Teridian 78Q2120C 10/100BASE-TX Transceiver Data Sheet
All Teridian 100BASE-TX documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What power‑saving modes does the 78Q2120C support?
It supports Chip Power‑Down, Receive Power Management, and Transmit High‑Impedance modes.
From: Teridian 78Q2120C 10/100BASE-TX Transceiver Data Sheet
How is the transmit clock generated for 100BASE‑TX operation?
An on‑chip frequency synthesizer multiplies the 25 MHz reference clock by 5 to produce a 125 MHz transmit clock.
From: Teridian 78Q2120C 10/100BASE-TX Transceiver Data Sheet
What supply voltage does the 78Q2123/78Q2133 require?
The transceiver operates from a single 3.3 V (+0.3 V) supply.
From: Teridian 78Q2123/78Q2133 MicroPHY 10/100BASE-TX Transceiver Data Sheet
How many power‑saving modes are supported?
Three power‑saving modes are supported: chip power‑down, receive power management, and transmit high‑impedance mode.
From: Teridian 78Q2123/78Q2133 MicroPHY 10/100BASE-TX Transceiver Data Sheet