Ksz80 Ob S4lv02 Datasheet -

The Microchip KSZ8081RNA-S4LV02 is a 10Base-T/100Base-TX Ethernet PHY transceiver utilizing RMII v1.2, designed for low-power, space-constrained industrial and consumer applications. Featuring a 24-pin QFN package, it offers 6 kV ESD protection, HP Auto MDI/MDI-X, and LinkMD diagnostics, though it lacks Energy Efficient Ethernet (EEE) and requires software-based configuration for many settings. Read the full details on the Microchip website. KSZ8081 - Microchip Technology

1. 10Base-T: Standard Ethernet (10 Mbps). Operates over Category 3 or better cabling.
2. 100Base-TX: Fast Ethernet (100 Mbps). Requires Category 5 or better cabling.
3. Power Down Mode: Controlled via the MII Management register. The PHY stops all internal clocks and drawing minimal current.
4. Isolate Mode: The PHY is electrically isolated from the MII/RMII bus (high impedance), often used when multiple PHYs share a bus.

: Includes on-chip termination resistors for differential pairs, which reduces component count and simplifies PCB layout. Auto MDI/MDI-X ksz80 ob s4lv02 datasheet

• Package type (SOT-23-5, SOIC-8, QFN, etc.)
• Manufacturer logo (small symbol on the chip)
• Any other text on the IC (e.g., “M”, “A”, “V”, “OB” could be date or voltage grade)

KSZ8081: A single-chip 10/100 Ethernet transceiver often used in game consoles, IP TVs, and set-top boxes. 10Base-T: Standard Ethernet (10 Mbps)

• Speed: 10Mbps and 100Mbps.
• Interface: RGMII (Reduced Gigabit Media Independent Interface) or MII (Media Independent Interface).
• Auto-Negotiation: Automatically selects the link speed and duplex mode.
• Power Consumption: Very low power modes, including power-down and standby modes.
• Package: Typically comes in a 32-pin QFN package (KSZ8081MNX) or LPQFP.

Depending on the specific TV model, you may encounter different versions of the underlying PHY chip: KSZ8081RNA Depending on the specific TV model

Elena scanned the dense tables of register maps. She was looking for the hardware configuration straps—the physical pins that dictated how the chip behaved at the exact millisecond power was applied. Page 24: Pin 14 (RXD1/PHYAD1). Page 25: Pin 15 (RXD0/PHYAD0).

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