KSZ8721BT

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KSZ8721BT

IC TRANSCEIVER FULL 1/1 48TQFP

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規格

Supplier Microchip Technology
Package Tray
ProductStatus Active
Type Transceiver
Protocol MII, RMII
NumberofDrivers/Receivers 1/1
Duplex Full
Voltage-Supply 2.375V ~ 2.625V
OperatingTemperature 0°C ~ 70°C
MountingType Surface Mount
Package/Case 48-TQFP

概述

Description

KSZ8721BT is Microchip/Micrel’s 10/100 Mbps Ethernet PHY (physical layer). It sits between a MAC/SoC and the RJ-45 magnetics, providing the actual Ethernet transceiver function. It does not include a MAC, so you still need an Ethernet controller in your MCU/SoC.
Key points:
- Supports 10/100 Mbps operation with auto-negotiation (speed/duplex).
- Interfaces to the MAC via RMII or MII.
- Provides link/activity status LEDs and low-power/idle modes.
- Requires external magnetics and an RJ-45 connector.
- Used in embedded designs to add Ethernet connectivity.
In short: KSZ8721BT = standalone Ethernet PHY for a MAC-based 10/100 Ethernet interface.

Features

Here are the typical features of KSZ8721BT (10/100 Mbps PHY):
- 10/100 Mbps Ethernet Physical Layer (PHY)
- MAC interface options: MII and RMII
- MDIO/MDC management interface (IEEE 802.3)
- Auto-Negotiation for 10/100 Mbps, full/half duplex
- Auto-MDI/MDI-X
- Energy Efficient Ethernet (IEEE 802.3az) support
- Industrial temperature range (typically -40°C to +85°C)
- Status LEDs for Link/Activity/Speed (depending on variant)
- Low-power modes and wake/standby options
- Requires external magnetics (external Ethernet transformer)
Note: exact pinout, packaging, and extra features may vary by revision; consult the datasheet for precise specifications.

Package

KSZ8721BT is available in a 28‑pin QFN package (5x5 mm).

Pinout

- Pin count: 28-pin package (28 pins).
- Function: 10/100 Mbps Ethernet PHY transceiver. Provides the physical layer between the MAC (via MII/RMII) and the Ethernet magnetics, with TX/RX differential pairs, MDC/MDIO management interface, and optional LED/status pins (requires external magnetics).

Manufacturer

- Manufacturer: Microchip Technology Inc. (the KSZ8721BT is part of Microchip’s Ethernet PHY family; the KSZ parts originated with Micrel and Microchip acquired Micrel in 2015).
- What kind of company: An American multinational semiconductor company that designs, develops, and sells microcontrollers, analog/mixed-signal and memory ICs, and networking products (including Ethernet PHYs).

Application

KSZ8721BT is a 1-port, 10/100/1000BASE-T Ethernet PHY with RMII/MII interface. It provides the physical layer for MCU/SoC Ethernet designs. Typical applications: consumer networking gear (routers, switches, access points), IP cameras and network video recorders, set-top boxes; industrial automation and control systems; and other embedded Ethernet devices needing a compact PHY.

Equivalent

Equivalent 10/100 Ethernet PHYs with RMII/MII interfaces:
- TI DP83848C
- Microchip/SMSC LAN8720A
- Microchip LAN8740A
- Microchip LAN8742A
Check exact RMII/MII timing, voltage (3.3V/5V), and pinout before substituting.

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